Chlorine-Resistant Valves for the Pulp and Paper Industry

The worldwide pulp and paper industry produces hundreds of thousands of tons of paper each year. It is not hard to recognize how important paper production is across the world. This vital industry presents a number of unique challenges related to the production processes. Paper mills often use a variety of chemicals like chlorine dioxide that must be precisely controlled and sequestered. Pulp and paper production requires specialized valves and fittings that can stand up to unique conditions and long-term use.

The Pulp and Paper industry has also been the focus of concern because of environmental impact. These factors increase the importance of quality valves and fitting in the paper industry. CPV Manufacturing creates valves and fittings designed specifically for pulp and paper production. Our engineers design all of our products to meet exact specifications and stand up to the unique conditions and requirements of each application. Find out more about the specialized valves and fittings designed for pulp and paper production.

Chlorine’s liquid and gas form both present a number of challenges for valves in pipe systems. Liquid chlorine can be highly corrosive on many metal valves, and keeping any moisture separated from the chlorine is essential. Chlorine is also very reactive, becoming explosive when in contact with certain oils and greases. Chlorine can also support combustion and becomes dangerously reactive at high temperatures. Another common issue with chlorine gas is volumetric expansion. As the temperature of chlorine increases, so does the volume.

CPV Manufacturing offers valves that meet the many requirements of pipe systems with chlorine. Our globe, ball, and butterfly valves are designed with materials that resist chlorine corrosion. Valves can also be custom fitted and designed to protect against volumetric expansion, moisture, cavitation, and contaminants like oil or grease. All our valves used in chlorine systems meet the requirements of The Chlorine Institute, which regulates chlorine production and distribution to ensure safety. Valve and fitting maintenance is also essential in these applications. CPV’s experts can work with you on our pulp and paper industry valves and fittings, helping you find the perfect products for your specific application.

Oxygen Valve Quality Hinges on Compatibility and Cleanliness

Any compressed gas poses a potential risk of ignition and corresponding hazards. Oxygen for example, does not burn by itself. However, it supports combustion and, if not properly contained and managed, oxygen can react explosively or cause spontaneous ignition of other materials. This risk increases as oxygen is put under pressure and as temperatures rise.  

CPV Manufacturing fabricates oxygen control valves for oxygen filling systems. Several industries and applications rely on pressurized oxygen stored in cylinders or containers, such as medical, pharmaceutical, chemical, welding, and waste treatment, among others. Quality, durability, and sensitivity all factor into selection of an oxygen valve that supplies the proper balance of control and protection.  


Oxygen Highly Regulated Due to Hazard Potential

OSHA standards regulate bulk oxygen systems installed on industrial and institutional consumer locations. The U.S. Department of Transportation (DOT) considers medical oxygen a hazardous material, regulating its transportation, and the U.S. Food and Drug Administration (FDA) classifies it as a prescription drug.

State fire codes regulate its handling. International agencies are no exception, with a publication available from the European Industrial Gases Association (EIGA) that discusses the valves involved in their control and specifications for a proper oxygen valve.  

Oxygen Valve Purpose and Placement 

An oxygen valve controls and regulates the flow of pressurized oxygen gas, stored in cylinders or traveling through pipelines. Of all the components within the system, the part most prone to issues and subsequent system failure is the valve.

Issues related to an improperly functioning oxygen valve can include rapid pressure change and subsequent heat generation or leaks. Many of these issues and their associated dangers are discussed in a previous blog post found here 

Quality and Durability Begin with Compatible Material Selection

CPV manufactures all oxygen valves of either naval brass or Monel®, depending on customer preference. Naval brass is a copper alloy that contains zinc for extra strength in fact, making naval brass stronger than other types.

The zinc content in naval brass (39%) also makes it less ductile than brass containing less zinc. A hint of lead helps make it machinable and the addition of one percent tin increases its corrosion resistance.  

Monel(®) is a nickel/copper alloy and typically more expensive than naval brass. Either choice is highly compatible with oxygen applications.  

Customers should avoid oxygen valves made of materials susceptible to oxidation or corrosion, which will weaken the valve and could create a leak. An iron containing material for example, can add moisture to the oxygen, stimulating a chemical reaction that will lead to corrosion.  

Copper alloys have proven to be the most effective among metal options to resist ignition because a copper alloy has the slowest combustion rate. For any type of hazardous gas containment or control, naval brass is a preferred selection for fire and explosion safety purposes.  

Oxygen Cleaning and Government Certifications

Our cleaning process, CPV OX-1, meets the cleaning standards for oxygen cleaning and packaging per the Compressed Gas Association (G-4.1) and ASTM-G93, or related cleanliness standards.  

Separate standards exist for government issue valves. CPV Mfg. and its aqueous component cleaning process recently received approval by NAVSEA for MIL-STD-1330D and MIL-STD-1622B Oxygen Cleaning.

Obtaining this approval enables CPV to meet the needs of the U.S. Navy and other applications that would benefit from military grade or intensive cleaning standards.  

The MIL-STD-1330D applies to other systems outside of oxygen, including Department of Defense Standard Practice, Precision Cleaning and Testing of Shipboard Oxygen, Helium, Helium-Oxygen, Nitrogen, and Hydrogen Systems.  

Reliability and Design Functionality

CPV earns the business of new customers who come to the company because their other valves are leaking and are unreliable. CPV valve customers will find our oxygen valve is the most robust and well-designed oxygen valve available. While no valve is ever completely worry free, operators can anticipate a service life that lasts for thousands of cycles without leaking or other issues.  

In many cases, CPV valves are rated for higher pressures than most competitors. In the United States, an oxygen valve pressure expectations are typically a maximum of 4,500 PSI (307 BAR). CPV oxygen valves exceed that to meet overseas standards for 6,000 PSI (414 BAR) 

Our valves also feature a soft seated design, which includes a Vespel® SP-21 Disc for bubble-tight, leak-free performance, at the highest-pressure ratings for oxygen valves.  

Clean Room Packaging and Training

CPV expanded its cleanroom in 2021 and is certified to meet ISO 14644 Class 7 standards. Our employees are trained and certified as Oxygen Clean Workers and validated to meet MIL-STD 1330D standards.  

All oxygen valves manufactured at CPV are thoroughly wiped down and packaged in the clean room in a double-layered vacuum-sealed bag, protecting them from moisture or contamination up to the point of installation.  

Find more information, including specifications and available sizes for the CPV OXNB ® O-EAL® Series of valves includes a Naval Brass Oxygen Valve, for oxygen service in fill plants, high-pressure manifolds, and other piping systems, visit pages 32 and 33 of our catalog.

The CPV GSB Master valves also service high-pressure gas shutoff and control, with approval for 6,000 PSIG operating pressure in oxygen service for commercial applications worldwide, for safe, reliable control.  Learn more about GSB Master Valves or visit our main company site at 


Master Valves: The Importance of Ergonomics in the Manufacturing Industry

Manually operated valves, otherwise called master or control valves, are a critical component for refineries, industrial gas production facilities and distribution centers. These valves control the movement of gas to fill industrial gas cylinders, or that traverse pipes for processing.

Due to their ubiquitous presence, these master valves must offer operators reliability, durability, cost effectiveness and one other characteristic not always factored into the design— ease of use          

The original equipment manufacturers (OEMs) that fabricate or construct the manifolds, fill plants, panels and high-pressure piping systems need a reliable partner for these integral components.

CPV Manufacturing is a world-renowned industrial valve manufacturer with a reputation built on our precision craftsmanship of robust, high-pressure solutions engineered to withstand the most demanding conditions.  


Safety First

The Compressed Gas Association and regulatory agencies like OSHA offer information about the hazards of compressed gas cylinders of all types, dangerous due to the high pressurization of their contents. Gaseous oxygen packaged in compressed gas cylinders serves multiple purposes and industries around the globe. These include the recreational, medical, power, chemical processing and metal refining industries, among others.  

This particular compressed gas also requires unique safety measures or extra requirements in regard to medical or industrial oxygen cylinder filling. This includes having the valve complete and pass an oxygen surge pressure test, which evaluates the ignition sensitivity of the valve.  

In addition to the hazards associated with a highly compressed gas, oxygen cylinders present the risk of fire. Any valve designed for use in this type of application must obtain an oxygen-safe approval at a specific operating pressure, without showing any indication of ignition failure.  


Operators expect this type of valve to operate flawlessly for thousands of cycles, and ideally, do so without maintenance. CPV master valves offer worry-free operations for countless hours of smooth, accurate, efficient, and consistent filling of valves and cylinders.  

Ergonomics or Ease of Use

During many years of operation, multiple industries have relied on brass hand valves, although not without some difficulties for the operator. Operator fatigue or other ergonomic repercussions stem from a few common characteristics associated with these valves. Namely, most require high torque to open and close, repeated numerous times over the course of a single shift.  

Plant operators and operations can benefit from a valve with an ergonomically designed handle. The GSB master valve from CPV requires low torque to open and close while still providing a bubble-tight seal.   

Consistent Sealing

While constructing a more ergonomically friendly master valve, it is critical to ensure leak rates are controlled. In addition to ergonomics, leak rates both internally and externally have historically created issues with master valves.  

Any components such as seals which can degrade over time, can cause parts failure. Leaky or degraded seals can force a company to replace these master valves as often as every three to six months. Despite their generally economical price point, frequent replacement of even an inexpensive part can unnecessarily strain a capital expense budget, not to mention the added maintenance impact and associated downtime for replacement.  

The Answer

The CPV GSB Valve answers all critical performance factors for a master valve that is reliable, dependable, durable, safe and ergonomically designed for ease of use.  

Highest Pressure Rating in the Industry

The CPV GSB Valve is rated for 6,000 PSIG (414 bar) for Oxygen Service for commercial applications worldwide. It has passed oxygen pressure surge testing with 100% oxygen gas, approved by WHA International, Inc. for ISO 10297 and ISO 7291. In this case, the master GSB valve was tested up to 7,200 PSIG (496 bar) in oxygen, with no sign of failure or leaks.  

CPV Manufacturing’s GSB master valve is the only master or control valve available that meets these stringent requirements. OEMs can rely on the GSB master valve for safety and reliability for high-pressure cylinder filling and processing projects.  

Leak Prevention

CPV prevents leaks by offering the GSB valve fitted with our O-Ring Face-Seal, or O-SEAL separable union connections. This valve is rated for 7,800 PSIG (538 bar) service in inert gas applications, including acetylene, helium, hydrogen, nitrogen, mixed gases and others.  

Ergonomic Design 

The larger, four-prong aluminum handle has an updated design to make it even easier to operate. Its performance was tested internally and externally with several customers.  

In just four turns, the master valve can open or close and with a lower torque than the competition. Further, there are no leaks for a bubble-tight seal for the life cycle of the valve. While other valves become more difficult to turn after multiple cycles, the master valve from CPV Manufacturing remains easy to turn supplying trouble-free operation for thousands of cycles.  

This is a considerable benefit considering the number of valves present on a single panel. There can be anywhere from a few to more than a dozen valves on an individual control panel.  

Thorough Testing

Many manufacturers order sufficient quantities to maintain continuous production without waiting for replacement parts. Each GSB Valve from CPV Manufacturing is fully tested and vacuum sealed to preserve optimal product integrity and cleanliness 

This GSB master valve best serves critical applications and requirements for gas cylinder fill plants, manifolds, panels, and tube trailers. The robust design is leak-free and supplies the same reliable sealing mechanisms common to other CPV valves used in the high-pressure filling industry for the past 80 years.  

GSB features and benefits: 

  • Oxygen safe – Approved per ISO 10297 and ISO 7291 for 6000 PSIG in Oxygen Service 
  • Highest flow coefficient in the industry 
  • Ergonomically designed handle 
  • Low torque operation even at full pressure 
  • Four turns  
  • Ease of use over thousands of cycles 
  • Low torque operation 
  • Good flow characteristics 
  • 100% Oxygen Cleaned & Packaged per CGA G-4.1 and ASTM G93 standards 
  • Soft-seated sealing for bubble tight, leak free operation 

The CPV GSB master valve is interchangeable with existing master valves. OEMs and operators find it easy to install to replace under-performing, lower quality valves with a lower pressure rating.  

For more information on available sizes or custom requirements, contact CPV Manufacturing, for master valves or fittings that supply the quality, durability, safety, and leak-proof integrity that allow your operations to run smoothly.  

Globe Valves Offer a World of Difference for Tighter Seals

Globe valves operate as a linear motion valve to stop, start and regulate flow. The design incorporates a disc-to-seat ring contact at a perpendicular or 45-degree angle, to regulate the flow of gas or liquid either under or above the disc and seat, depending on the application, allowing for a tight seal. This capability allows globe valves the flexibility for use in both high- and low-pressure applications and eliminates potential seat leakage.

This reliability and flexibility explain why at one time, globe valves were utilized across industries more than any other type. As valve designs evolved, new designs better suited for various applications replaced globe valves in some instances. However, for a tight regulation of flow, the globe valve performs better than other types of valves, such as gate or ball valves. Determine whether a globe valve will best suit your flow parameters and requirements, and the best applications for its use.

Globe Valve Design and Operation

As its name implies, a globe valve is constructed with a round or spherical body, plus a seated disc and a vertical stem. The flow inside the globe valve is regulated by this stem’s movement, either up or down. And depending on its operational position, either fully or partially open or closed, the globe valve regulates the liquid flow within a pipeline.

The seats are designed to line up parallel with the flow of the liquid, utilizing its force to help seat the disc for a tight seal, without leakage. The farther the disc is positioned away from the seat, the more fluid will flow through the valve. The globe valve’s design and construction make it an ideal component for high-pressure and high-temperature systems.

The Importance of Directional Flow in a Globe Valve

The reason globe valves can operate in a wide range of pressure and temperature applications has to do with the way the disc operates. Globe valves used in low-pressure and low-temperature applications are designed to have the pressure flow under the disc. This directional flow allows the disc to rotate freely on the valve stem. The free rotation and low-pressure application allow the disc to fit snugly against the seat as the valve closes, for less leakage.

When pressure flows above the seat in a high-pressure and/or high-temperature system, this helps prevent the stem from contracting as it cools down, and also keeps the disc from lifting off the seat. A globe valve body should have an arrow indicator to point to the valve flow direction.

Globe valves come in a range of sizes, depending on the pressure and flow required. These valves can be either air or electronically actuated for reliability and better regulation. This actuation gives the globe valve another advantage over other style valves, such as a gate valve, which can be heavy and difficult to turn.

A globe valve can supply:

  • Automated actuation (shutoff) for greater reliability
  • A shorter stroke (compared to a gate valve)
  • Ability to:
    • operate under extreme temperatures, hot or cold
    • regulate flow of abrasive or caustic substances
    • regulate low- or high-pressure applications
  • Wide range of material options

Typical applications or industries for use of a globe valve would include:

  • Petrochemical for flow-regulated fuel oil systems
  • Industrial gas applications
  • Bulk filling in high pressure systems
  • Water cooling systems
  • Chemical feed systems
  • Steam vents, boilers and drains
  • Naval and commercial vessels (bilge suction or to prevent back flooding)

Types of Globe Valves Available

Globe Valve Design Based on Fluid Flow

The difference as explained earlier, is in the discs, and the method of closure or operation in accordance with the direction of the material flow, of either a gas or a liquid. A disc that closes against the direction of the flow offers a quick opening valve. Applications that require a quick closing valve might select a globe valve with a disc that closes with the direction of the flow.

Ball vs. Needle Disc Types

A ball disc globe valve is recommended for a low-pressure, low-temperature system. A needle disc is more often indicated for a high-pressure, high-temperature system

Z vs. Y Globe Valves

A Z style globe valve features a disc and seat that are perpendicular or sit at 90° to the pipe axis.

A Y-type of globe valve is designed to have the stem and seat of the valve at 45° to the pipe axis.

CPV Manufacturing offers its customers a wide range of globe valve sizes and material choices, with custom elements and design options available. CPV has the capability to design globe valves to handle specialty connections. Sealing integrity is built into any globe valve manufactured by CPV. For flexibility, reliability and a tight seal on a globe valve that will operate trouble-free for years, contact CPV Manufacturing today.

Bring the Hammer to a Standstill—Silent Check Valves Protect Pumps and Pipes

A silent check valve, sometimes called a poppet check valve, non-return valve or even one-way valve, might have different names but they all supply the same function. This type of valve helps control and protect against pressure surges in water lines, or reverse flow, and the potentially devastating consequences or effects on pipes and pumps. When a pump pauses or stops and the flow of liquid also abruptly stops, this in turn stimulates high pressure shock waves that, if unchecked, can damage the pump and pipes. A silent check valve, when functioning properly, prevents these shock waves and the knocking or banging that signifies a water hammer phenomenon, thus protecting pumps, pipes and surrounding equipment.  

The operation of a silent check valve hinges on a spring assisted disc, engineered to close the valve the instant the forward flow of liquid ceases. This prevents reverse flow to eliminate water hammer.  

Consequences of a Water Hammer

Water hammer is a phenomenon that occurs when the pump shuts off and forward momentum propels the liquid on its course until offset by gravity or friction. When this happens and the liquid must suddenly either stop or change direction, this creates a shock wave or hydraulic surge. When a valve closes suddenly, and the water slams into it, this impact creates the water hammer that causes the knocking or banging sound inside a pipe after a pump abruptly shuts down.  

Depending on the size of the column of liquid and its speed, the force of this momentum is powerful enough to cause serious damage to capital equipment, such as snapping the pump shaft or bursting the pump casing or pipes.  

While this can occur during a single event, the effect can accumulate over time as the water hammer beats on the pump or the pipes, eventually resulting in ruptured pipes or a leak. This has the potential to create safety hazards for the workforce, damage surrounding equipment and/or cause extensive downtime and costly maintenance and repairs.  

 Other consequences besides water hammer could include over pressure from one side or potential contamination if the silent check valve is designed to prevent two different types of liquid from mixing together.  

Silent Check Valve Construction

Design and materials for CPV Manufacturing’s silent check valves conforms to the ASME Boiler and Pressure Vessel Code. Standard valve bodies are cast of carbon steel with trim of either stainless steel or brass, however silent check valve bodies can be manufactured of bronze or cast iron as well. The choice of material depends on the potentially corrosive nature of the liquid the valves are designed to regulate.  

 CPV supplies check valves in a range of smaller sizes up to eight inches in diameter as the largest available. Most of in line piston style check valves are a low-pressure flange connection that meet the ANSI B16.5 flange bolt pattern, in class 125 to class 1500 (pressure).  

 Each has a spring-actuated disc that opens when flow starts and automatically closes when flow stops. The reliable checking action, designed and engineered into each valve, will not allow flowback. While a check valve isn’t a safety valve per se, it is critical to system performance and reliability.  

 All of the silent check valves manufacturing by CPV are fast closing, offering a: 

  • Sealing, bubble-type shut off 
  • Quiet operation 
  • Wide pressure range 
  • Broad temperature range 
  • Decades of leak-free and trouble-free operation  

 The full flow design offers good flow rates through CPV silent check valves, to minimize head loss and pressure loss. Both help increase the valve and overall system efficiency.  

Description of Check Valve Features

1. Helical Springs 

These springs are engineered to ensure proper and complete valve closure automatically at zero velocity, when forward flow stops and before the beginning of reverse flow. CPV uses springs that can provide the lowest stiffness or K-factor consistent with optimum silent check valve operation. The springs are engineered for a conservatively estimated lifespan or performance of at least 10 million closures. 

2. Guided Lift Design 

A two-point bearing guides the disc with widely spaced bearings both above and below the seating surface. This eliminates any potential of the SCPV silent check valve disc tilting or becoming misaligned.  

3. Full Flow Area

This design feature increases the valve’s efficiency and minimizes head loss.  

 Silent check valves are ubiquitous across industries and commercial buildings and compounds, found in pipelines and wherever there is a water system, including: 

  • Manufacturing or processing operations that use liquid or water 
  • Chemical processing 
  • Oil and gas industry 
  • Small communities 
  • Residential facilities 
  • Hospitals and universities 

Work With Us

Companies in the market for silent check valves can count on CPV for reliability. It isn’t uncommon for silent check valves manufactured by CPV to have seen continuous service for 50 years or more. Once they are installed, it is a “set it and forget it” durable valve that will not need to be replaced for years, and supply trouble free service in piping systems around the world.  

Approval for 1330/1622 Oxygen Cleaning

Kennett Square, PA, USA (8/23/22) – Admiral Valve, LLC dba CPV Manufacturing Recently Approved for 1330/1622 Oxygen Cleaning

CPV Manufacturing’s aqueous component cleaning process was recently approved by NAVSEA for MIL-STD-1330D and MIL-STD-1622B cleaning. With the approval for 1330/1622 Oxygen Cleaning, CPV will now be able to better meet the needs of the U.S. Navy and other applications requiring intensive cleaning standards.

This approval gives CPV the ability to clean valve components, produce and test finished assembled valves, and package shipments meeting 1330/1622 standards without materials leaving its facility prior to the final shipment. This will allow for greater in-house efficiency, decreased lead times and easier product traceability. Below are the standards listed in full.

  • MIL-STD-1330D Department of Defense Standard Practice, Precision Cleaning and Testing of Shipboard Oxygen, Helium, Helium-Oxygen, Nitrogen, and Hydrogen Systems
  • MIL-STD-1622B Department of Defense Standard Practice, Cleaning of Shipboard Compressed Air Systems.

This is an exponential step in the growth of CPV and President and CEO, David London is ecstatic. “Attaining this high-level certification attests to our strong commitment to our customers and the production of high-quality, safe products. We have been working towards this approval for quite some time and have made significant investments into our facilities and personnel in preparation for this new standard.”

CPV’s cleanroom was expanded in 2021 and Certified to meet ISO 14644 Class 7 standards. Employees have been trained and certified as Oxygen Clean Workers and validated to meet MIL-STD-1330D standards. This further enhances CPV’s cleaning program which already meets:

  • CGA G-4.1-2018 – Cleaning of Equipment for Oxygen Service and ASTM G93
  • ASTM G93/G93M-19 – Cleanliness Levels and Cleaning Methods for Materials and Equipment Used in Oxygen-Enriched Environments


And CPV isn’t stopping there. CPV promises to continue to invest in its facility, employees, and equipment to provide best-in-class service and products to ends users in every application possible. CPV is proud to finally say we are certified for MIL-STD-1330D and MIL-STD-1622B Oxygen Cleaning and is looking forward to the next challenge they can accomplish for their customers.


If you have any questions or wish to learn more, contact CPV today at


CPV Manufacturing LogoCPV Manufacturing was founded in 1915 as a one-man business, manufacturing replacement valves for steam-driven reciprocating pumps. Today, CPV is recognized worldwide for its high-quality valves and fittings and dedication to state-of-the-art design, equipment, safety, and reliability. CPV Manufacturing’s valves withstand the high tolerances required by the maritime, industrial gas, and petrochemical industries. Based out of Kennett Square, PA, USA, CPV has a complete facility for developing, manufacturing, and testing its products. Dedicated workers and global partnerships allow CPV to be a market leader. 

Top Considerations When Selecting a High-Pressure Relief Valve

High-pressure relief valves fulfill a critical safety function in multiple applications, ranging from petrochemical to power, marine and aerospace industries.  Regardless of the application, certain primary features can help guide engineers when selecting a durable high-pressure relief valve that will help avoid catastrophic failure to protect your workers’ health and safety while also preserving capital equipment.


High-pressure relief valve


What’s the Primary Purpose of a Relief Valve?

A relief valve functions as an operational safety feature, to help control and regulate the flow of high-pressure fluids and gases. It is designed to vent off extra pressure, whether from gas or a liquid. The design triggers the valve to open once a system reaches a predetermined set pressure.

This protects systems from experiencing pressures that exceed their design limits. Once a system reaches that predetermined level or valve set pressure, the relief valve opens, and a portion of the liquid or gas is removed from the system by diverting it through an outlet in the valve.

The relief valve helps maintain safe pressure levels to prevent potential damage or catastrophic failure. Once system pressure drops to its predetermined normal level, the relief valve closes or “reseats” until it is needed again. While a relief valve functions as a safety feature, it differs from a safety valve which only triggers in an emergency.

A safety valve opens instantly to its full venting capacity while a high-pressure relief valve opens gradually when system pressure reaches the preset level.

A catastrophic failure could mean loss of capital equipment such as pipes if the pressure doesn’t diminish. Pressure build up, if unrelieved, can lead to more serious consequences such as an explosion, potentially harming personnel and causing more widespread damage to equipment and surroundings.

High-pressure relief valves are found in several different industries including marine applications on naval and commercial vessels, aerospace, industrial gas, the petrochemical industry, power plants and many industrial applications as well.


Factors for Specifying a Relief Valve

There are several factors to take into consideration when specifying a relief valve. These can include:

1. Set pressure limit

The set pressure limit is the threshold that triggers the high-pressure relief valve action. For example, if the normal system pressure is 3000 PSI the engineer might determine the set pressure limit is 3300 PSI. Once pressure reaches that threshold it triggers the relief valve which then vents the excess liquid or gas. Consistent triggering of the relief valve often indicates a problem with the system.

2. Valve capacity

This relates to the amount of flow the valve is able to relieve.

Connection size and type—The connection of the valve or valve size needs to correspond to the size of the discharge piping. Operators must also determine the connection type for the inlet and outlet ends, typically threaded or flanged.

3. Shock and vibration

Material selection, design and testing will reveal the ability of the valve to withstand shock and vibration without triggering its action. Naval vessels require parts such as relief valves pass specifications for shock and vibration.

4. Environment

This particularly plays a role in material selection for the valve construction when it will come into contact with a corrosive or abrasive substance. An example of this would be a marine relief valve that can or will regularly encounter salt water. All CPV Mfg. high-pressure relief valve specified for marine purposes are manufactured of bronze.

5. Temperature

This factor impacts O-ring material selection. Depending on the temperature range, CPV can specify a specialty elastomer or material for the O-ring.

6. Orifice size

This relates to the relief capacity of the valve. When the orifice size is smaller, the relief valve can rate to a higher pressure but relieve less capacity. The larger the orifice, the lower the pressure but the higher the relief capacity of the valve.

7. Positive Reseating

All relief valves manufactured by CPV have a positive reseating, which means after it blows at pressure, it reseats itself or reseals once the pressure drops into the normal range. This reseating capability allows for continuous operations. Look for a soft seating design which acts as a bubble tight seal, versus a metal-to-metal interface, which can be prone to leaking.

8. Spring adjustment

A sensitive spring, such as those incorporated into a CPV high-pressure relief valve, allows the operator to adjust the release for a very narrow PSI range. For example, the spring itself might be rated for 1,000 to 2,000 PSI, but the sensitivity enables the operator to set it at a specific target, such as 1,015 PSI, for example.

Add to this testing capabilities, and the cooperative efforts of the engineering design team and the valve manufacturer can produce a valve with the most accurate control of the blowdown pressure setting.

Why Choose CPV Manufacturing? 

CPV manufactures relief valves in two different series: the 150 series and our flagship O-SEAL® line. The 150 series is a line of soft-seated female threaded relief valves with set pressures that range from the low end of 5 PSI up to 300 PSI.

The O-SEAL® line of soft-seated valves and separable fittings allow for positive control of high-pressure liquids and gases.  This line offers leak proof performance from vacuum up to 6000 PSI (414 bar).

CPV has been supplying high-pressure relief valves to the U.S. Navy for mission critical applications since the 1950s. Each individual valve built by CPV Manufacturing undergoes testing, not random or batch testing, but each valve.

Valves must meet a safety factor for the pressure rating of four to one.  If a valve is rated for 6,000 PSI for example, the valve strength is up to or in excess of 24,000 PSI. In addition, all valves meet the ASME Boiler and Pressure Vessel Code. Our valves are over-engineered to exceed the pressure strength rating, for the utmost in reliability.

Trust CPV Manufacturing for durable, reliable, high-pressure valves that meet the stringent requirements of the U.S. Navy, found in service in submarines, aircraft carries and other vessels throughout the fleet.  We can work within your specifications or consult for customized projects and applications.

Contact us today for a quotation.


Installation and Removal of CPV’s New Handles

The process of installing and removing our new ergonomic valve handles for the full-size range of O-SEAL® and G-Series® product lines is so simple it can be done in under a minute! The ease of installation can be seen below in the step by step tutorial.

This specific bulletin shows the installation of a 4-prong valve handle; however, the same steps apply to our 2-prong valve handles. The only difference is and additional step due to an extra washer in the replacement kit, also shown below. During installation and removal of a 2-prong handle, the extra step would occur after step 2 for both.

Installation and Removal of CPV's New Handles


For extra guidance, we have listed all the removal steps below and made an in-depth YouTube tutorial showing just how simple the installation and removal of our new valve handles really are!

Removal Steps:

Step 1: Using the Handle Installation Tool, pick out one end of the Snap Ring and lift it out of the groove. Be sure to place your hand over the ring to keep it from flying away and becoming lost.

Step 2: Remove the Cap covering the Hex Nut.

Step 3: Remove the Hex Nut with a Socket Wrench. The handle should then come right off the valve.


Feel free to contact us at or 484.731.4010 if you have any other questions!


CPV Manufacturing LogoCPV Manufacturing was founded in 1915 as a one-man business, manufacturing replacement valves for steam-driven reciprocating pumps. Today, CPV is recognized worldwide for its high-quality valves and fittings and dedication to state-of-the-art design, equipment, safety, and reliability. CPV Manufacturing’s valves withstand the high tolerances required by the maritime, industrial gas, and petrochemical industries. Based out of Kennett Square, PA, USA, CPV has a complete facility for developing, manufacturing, and testing its products. Dedicated workers and global partnerships allow CPV to be a market leader. 


Needle Valve Supplier

Needle valves are used for regulating the flow of high-pressure fluids and gases within a pipeline. They are so aptly named because their plunger design is similar to that of a sewing needle, and it is this innovative design that allows them to control the flow of fluids and gases with extreme precision. Additionally, they protect delicate gauges from the damage that can be caused by sudden pressure changes.

They can be made from various materials, and the one you choose to use will depend greatly on the specific needs of your application. While they can be made from various materials, they can also be set up to operate manually or automatically. As the premier needle valve manufacturer, CPV Manufacturing offers a wide range of valve products to meet your needs.

Hydraulic needle valves are used to control flow in both directions in a pipeline. Needle valves are comparable to shut-off valves; however, a main distinction between the two types of valves is in the design. Needle valves feature a long plunger that is controlled by a handwheel. The needle valve’s plunger fits into a seat, and this is what gives it the ability to meticulously control the flow of fluids or gases.

Needle valves can be made from a variety of materials. Stainless steel needle valves are frequently used because they are durable, long-lasting, and require little maintenance. They can also withstand extreme temperatures. Brass needle valves are commonly used for instances such as drinking water or high-temperature applications. This type of needle valve is also able to resist corrosion and is a strong material, also making it ideal for chemical processing applications.

CPV Manufacturing is also known for gas needle valve manufacturing and can provide gas needle valves that allow you to closely control gas processes, such as gas mixing applications. If you have questions about our needle valves or need assistance selecting the right valve for your application, contact us today.

Why Become a CPV Distributor?

At first glance, it may seem like becoming a CPV Manufacturing distributor is an appropriate career choice for only those who are interested in the petrochemical, shipbuilding or industrial gas industries; however, a CPV Manufacturing distributor is so much more than that. Your passion for helping improve processes with superior products is what’s needed to become a CPV distributor. CPV distributors fill a vital role as valve distributors in building relationships and connecting companies that are looking for solutions and the industry-leading products CPV manufactures. Our high-quality products are in demand across multiple industries, including shipbuilding, petrochemical, industrial gas, chlorine, oil and gas, and pharmaceutical.

As a valve manufacturer and pipe-fitting manufacturer, our designs are rigorously tested to meet the exacting standards required of high-pressure applications. As a valve supplier, you will be helping companies improve their applications by using the highest-quality valves and fittings. Valve distributors play a critical role in providing the critical customer support for companies that would benefit from CPV Manufacturing products. Your earning potential will be nearly unlimited as you identify opportunities that would benefit from our world-renowned products. 

For over 100 years, CPV Manufacturing has been creating solutions as a valve and pipe-fitting manufacturer. Our products are designed to withstand even the most demanding conditions across a multitude of applications.

When you become a distributor of CPV Manufacturing products, you are becoming a part of a long history of excellence, working with a company that is known for providing the highest levels of customer support to the most demanding of industries. You can rely on our unwavering commitment to excellence and lasting value—which means our products will continue to be in demand by firms all over the world. At CPV Manufacturing, we will provide you with the support you need to be successful as a worldwide distributor. To learn more about becoming a CPV Manufacturing distributor, contact us today.