Zhejiang Dongri Valve Co., Ltd.
Trunnion ball Valves are engineered for heavy-duty performance in demanding industrial environments. Their fixed-stem design provides enhanced stability and reduces operating torque, making them suitable for reliable on-off flow control in high-pressure and high-temperature systems. Built for durability, these valves help support safe, efficient operation across oil and gas pipelines, petrochemical facilities, power generation plants, and other critical energy applications. With strong resistance to pressure, wear, and harsh service conditions, trunnion ball valves offer a dependable solution where long service life and consistent performance are essential.
A valve used in a pipeline, refinery, or gas processing plant may face high pressure, frequent cycling, temperature changes, and limited access for maintenance. A standard floating ball valve can work well in many systems, yet larger sizes and higher pressure ratings often require stronger support for the ball.
That is where a trunnion ball valve can fit the application.
I look at this valve as a practical choice for heavy-duty service because the ball is supported by a fixed stem at the top and a trunnion at the bottom. The support reduces the load placed on the valve seats and helps the actuator handle the opening and closing movement with less torque.
How a trunnion ball valve works
A trunnion-mounted ball valve uses a ball that rotates around a fixed axis. The upper stem turns the ball, while the lower trunnion keeps it in position.
During operation:
The ball does not move as freely inside the body as it may in a floating design. This structure can reduce seat friction, especially in large-diameter valves or high-pressure systems.
The actuator size also becomes easier to manage. Lower operating torque may allow the project team to select a more practical actuator, though the final choice still depends on pressure, temperature, fluid type, valve size, and operating conditions.
Why the design suits demanding service
Heavy-duty piping systems often need more than simple on-off control. They may require a valve that can remain closed for long periods, operate after extended storage, and handle pressure loads without placing excessive stress on the seats.
A trunnion ball valve can support these needs through several design features:
These features do not make every trunnion ball valve suitable for every system. Seat material, body material, seal design, and testing requirements still need careful review.
For example, a valve used on dry natural gas may need different seat and seal choices from a valve handling abrasive slurry. A valve in a cold gas facility may require materials and testing for low-temperature service. The body style alone cannot answer those questions.
A practical selection process
I usually begin with the service conditions rather than the valve name. The following details help narrow the selection:
Fluid type
Record whether the medium is natural gas, crude oil, refined fuel, water, steam, chemical fluid, or a multiphase mixture. Note any solids, corrosive components, toxic substances, or hydrate risks.
Pressure and temperature
Check normal, minimum, and maximum values. Design pressure is not always the same as daily operating pressure. Temperature changes can affect seat performance, body materials, and seal life.
Pipe size and pressure class
Match the valve size and pressure rating with the piping system. Common references may include API 6D, ASME B16.34, ASME B16.5, or project-specific specifications. The required standard should come from the project documents and applicable engineering practice.
End connection
Decide whether the system needs flanged, butt-weld, or another connection style. Butt-weld valves may reduce the number of flange joints, while flanged valves can be easier to remove during planned maintenance.
Seat and seal materials
Soft seats can provide tight shutoff in many clean services. Metal-seated designs may be considered for high-temperature service or fluids containing hard particles. The selection must account for leakage limits, temperature, pressure, chemical compatibility, and expected cycling.
Actuation
The actuator may be manual, pneumatic, electric, or hydraulic. Review available power, fail position, control signals, emergency shutdown needs, and the torque required across the full pressure range.
Maintenance access
Large valves can be heavy and difficult to reach. I recommend checking lifting points, actuator clearance, drain and vent access, and space for inspection before the equipment arrives on site.
Common applications
Trunnion ball valves are often selected for:
A pipeline station is a useful example. The mainline valve may remain fully open for long periods, then close during maintenance or an emergency shutdown. The valve needs to match the pipeline pressure class, support the selected actuator, and provide the required shutoff level. A valve sized only by pipe diameter may still be unsuitable if its seat material, fire-safe design, or actuator arrangement does not match the station conditions.
Another example is a loading terminal. The valve may cycle more often than a mainline isolation valve. In that case, I would pay closer attention to seat wear, stem sealing, actuator duty, and the fluid’s temperature and vapor pressure.
Maintenance points that should not be overlooked
A trunnion ball valve still needs a maintenance plan. The fixed support does not remove the need for inspection.
Operators should check:
The valve should be operated within its rated conditions. Forcing a partially closed ball valve to control flow can create erosion, vibration, and seat damage unless the valve was designed and approved for that duty. Many ball valves are intended for isolation rather than continuous throttling.
Before maintenance, the line must be isolated and depressurized according to the site’s safety procedure. A double-block-and-bleed arrangement may help verify isolation, yet it does not replace the plant’s lockout and pressure-release requirements.
My view is simple: a trunnion ball valve earns its place when the application involves larger sizes, higher pressure, frequent operation, or a need for controlled actuator torque. The right result comes from matching the complete valve package to the service—not from choosing a heavy-duty label alone.
Review the fluid, pressure, temperature, standards, seat materials, actuator, and maintenance access as one system. That approach gives engineers and buyers a clearer basis for selecting a valve that can perform its intended isolation duty throughout the project.
When I manage a pipeline system, I look for a valve that can control flow without adding avoidable pressure loss or creating extra maintenance work. The valve must also handle repeated operation, pressure changes, and demanding media. A trunnion-mounted ball valve often fits this need because its design supports the ball at the top and bottom instead of leaving the stem to carry the full load.
That support changes how the valve behaves under pressure.
A trunnion ball valve uses a fixed ball. The ball rotates around a central axis while the upper and lower trunnions hold it in position. The stem transfers the turning force to the ball, while the trunnions absorb much of the mechanical load.
A floating ball valve works in a different way. Fluid pressure pushes the ball toward the downstream seat. That design can work well for many smaller or moderate-pressure applications, yet the force needed to move the ball can rise as valve size and pressure increase.
With a trunnion design, the ball does not need to float against the seat. This can reduce operating torque and support the use of a smaller actuator for a suitable application.
Torque affects actuator size, energy use, and the overall cost of a valve package. A large valve operating at high pressure may need considerable force to rotate the ball. The trunnion structure helps carry the ball load, so the stem and actuator can focus more directly on rotation.
I see this as a practical benefit during system design. A lower torque requirement may allow engineers to select a more manageable actuator. The final choice still depends on pressure, temperature, seat material, fluid properties, safety requirements, and the valve manufacturer’s torque data.
A process plant that operates large gas pipeline valves, for example, may use electric, pneumatic, or hydraulic actuators. Each actuator type has its own response speed, control method, and maintenance needs. The trunnion valve does not remove those design decisions, but it can make the operating load easier to manage.
Pipeline valves often remain open for long periods and close only during isolation, maintenance, or an emergency event. The valve must stay stable while exposed to internal pressure and pipe forces.
A trunnion ball valve can suit these conditions because the supported ball reduces movement inside the body. Many designs also include features such as:
Not every valve includes every feature. I always check the actual specification rather than relying on the product name alone.
A full-bore valve can help maintain a smoother flow path and may allow pipeline cleaning tools, such as pigs, to pass through the line. This matters in oil, gas, and other long-distance pipeline systems where inspection and cleaning form part of routine asset care.
A ball valve creates a direct sealing surface between the ball and the seats. When the valve reaches the closed position, the seats press against the ball to limit flow through the line.
Trunnion ball valves are available with different seat arrangements. Common options include soft seats made from polymers and metal-seated designs. Soft seats can provide strong sealing for many clean fluids. Metal seats may be selected for high-temperature service, abrasive media, or conditions where soft materials may not perform well.
The seat choice needs careful review. A valve used for dry gas may need a different material from one used for slurry, steam, or corrosive chemicals. Temperature cycling, pressure changes, particles in the media, and chemical compatibility all affect service life.
A valve that seals well in a test environment may still need regular inspection after installation. Proper installation, pipe alignment, actuator setup, and operating procedures have a direct effect on performance.
A trunnion ball valve usually uses a spring-loaded seat system. The seats can move toward the ball to maintain contact when pressure conditions change. Some designs use upstream and downstream seats that support sealing from either side.
This arrangement can help the valve maintain shutoff performance across different pressure conditions. It also allows certain designs to release pressure from the valve cavity when internal pressure rises above the selected limit.
I pay close attention to cavity relief when reviewing a valve for gas or liquid service. A trapped fluid inside the body can expand as temperature increases. The valve specification should explain how the internal pressure is controlled and which seat design is used.
The valve still needs suitable operating conditions. Excessive cycling, abrasive particles, incorrect lubrication, or poor alignment can cause wear. A strong design does not replace a maintenance plan.
As valve diameter increases, the weight of the ball and the pressure acting on its surfaces also increase. A floating ball design may require a larger actuator as the load rises.
The trunnion structure can make large-diameter valves easier to operate. This is one reason trunnion ball valves are commonly considered for transmission pipelines, storage terminals, gas processing facilities, and large process lines.
For example, imagine a pipeline station that uses a large isolation valve near a compressor. The valve may remain open during normal transport and close when the station needs maintenance. The operator may choose a trunnion design to manage the valve’s torque and provide a firm shutoff point. The engineering team would still need to confirm pressure class, bore size, actuator type, cycle frequency, and emergency closing time.
I use a clear review process before selecting a valve.
1. Define the fluid
Record the medium, viscosity, solids content, corrosive elements, and temperature range. Natural gas, crude oil, water, steam, and chemical products can require different seat and body materials.
2. Confirm pressure and temperature
Check normal pressure, maximum pressure, minimum temperature, maximum temperature, and pressure surges. A valve rated for one operating range may not suit another.
3. Select the bore
A full-bore valve supports a more open flow path and may be needed for pigging. A reduced-bore model can offer a different cost and size balance. The choice should match the line design and maintenance plan.
4. Review the seat design
Soft seats, metal seats, and fire-safe arrangements serve different conditions. Ask for material data and temperature limits instead of choosing by price alone.
5. Match the actuator
Review operating torque, safety factor, power source, fail position, closing time, control signals, and site conditions. Outdoor installations may need protection against water, dust, corrosion, or extreme temperatures.
6. Check testing and documentation
Useful documents may include pressure test records, material certificates, dimensional drawings, torque charts, installation instructions, and maintenance guidance. The required standard depends on the project and region.
7. Plan maintenance access
Consider whether the valve can be inspected, serviced, or removed without creating unnecessary downtime. Seat injection points and drain connections may help maintenance teams, yet each feature needs proper training and safe procedures.
Some valve problems start before the valve reaches the site.
Choosing by size alone can lead to an unsuitable seat material or actuator. Selecting a valve without reviewing the fluid may create sealing problems. Ignoring pipeline alignment can place extra stress on the body and connections. Using the wrong torque setting may damage the seat or prevent full closure.
Storage also matters. Valves should remain protected from moisture, dust, and impact. The end covers should stay in place until installation. The actuator should be handled according to the supplier’s instructions.
I also avoid assuming that a larger actuator is always safer. Excessive torque can damage valve components. The actuator should match the valve’s operating data and the required safety margin.
Trunnion ball valves are often considered for:
They may not be the best fit for every control duty. A standard ball valve is often used for isolation rather than continuous throttling. If the valve must regulate flow for long periods, a control valve or another valve type may provide better service.
The application decides the answer. I look at the process conditions, not just the product label.
A trunnion ball valve can offer a practical balance of supported ball movement, manageable actuator torque, and dependable shutoff when the design matches the service. The value comes from the complete selection: body material, bore, seats, stem, actuator, testing, installation, and maintenance.
When I review a valve package, I focus on how it will behave after installation, not only how it looks on a specification sheet. That approach helps connect the valve design with the real needs of the pipeline and the people responsible for operating it.
When a valve handles high pressure, a large pipeline, or repeated operation, strength cannot be judged by the body wall alone. The ball, stem, seats, sealing system, and actuator connection all affect how the valve performs in service.
This is where I look at a trunnion ball valve.
A trunnion ball valve uses a fixed ball supported by a lower trunnion and an upper stem. The ball does not float freely inside the body. This structure helps control movement and reduces the operating torque needed to turn the ball, especially in larger sizes and higher pressure classes.
For a small utility line, a floating ball valve may be suitable. For a large gas pipeline, oil transfer line, or process system, the fixed-ball design can offer a more practical way to manage operating loads.
In a floating ball valve, the line pressure pushes the ball toward the downstream seat. This force helps create a seal, but it also increases the load on the seat and the torque needed for operation.
A trunnion ball valve carries much of the ball load through its support system. The seats can move toward the ball under pressure or spring force, depending on the design. This allows the valve to maintain contact without placing all operating force on one floating ball.
I pay close attention to this point when reviewing valves above DN200 or valves used in higher pressure services. A large ball can be heavy. A fixed support reduces unwanted movement and gives the actuator a more manageable operating load.
The actual torque still depends on several conditions:
A supplier should provide a torque table based on the service conditions, not only a general catalog value.
Trunnion ball valves are often selected for pipeline and process applications that require tight shutoff and controlled operation.
Typical services include:
A common field example is a pipeline block valve installed at a compressor or pumping station. The valve may remain fully open for long periods, then close during maintenance, isolation, or a process event. The valve needs to stay stable in the open position and provide reliable shutoff when closed.
A trunnion design can suit this duty because it handles large nominal sizes with lower actuator torque than many floating-ball arrangements. The complete valve still needs to be matched with the correct actuator, gearbox, control system, and shutdown method.
A strong body does not guarantee good sealing. I review the seat and stem sealing system with the same care as the pressure shell.
Many trunnion ball valves use spring-loaded seats. The spring helps keep the seat in contact with the ball when the pressure difference is low. Line pressure may also push the seat toward the ball, depending on whether the seat is self-relieving or pressure-assisted.
The valve data sheet should explain:
Double block and bleed may be available on certain designs. This feature allows the valve to isolate the upstream and downstream sides while the body cavity is vented or drained. It should not be assumed from the valve type alone. The seat design and test arrangement need confirmation.
For gas service, stem sealing is another area I examine closely. A low-emission packing arrangement may be required by the plant specification. The supplier should state the packing material, test method, and operating temperature range.
Soft-seated trunnion ball valves are often used when the fluid is clean and the temperature stays within the seat material range. Materials such as reinforced PTFE, nylon, or other engineered polymers may be selected according to the service.
Metal-seated valves can be considered for abrasive fluids, high temperatures, or applications where soft seat materials may not last. They usually need tighter control of surface finish, coating quality, and manufacturing tolerance.
A metal seat is not automatically suitable for every difficult service. Particles in the line, poor flushing, or unsuitable coating selection can still lead to leakage or wear. I ask for details about:
The right choice depends on the fluid and operating conditions rather than the valve name alone.
For industrial pipeline valves, I normally check whether the design and tests follow the project specification and relevant standards. Common references may include:
The exact standard depends on the application and purchase specification. A certificate should match the actual valve model, pressure class, size, and test scope.
I also request the pressure test report, material certificates, dimensional drawings, torque data, operation manual, and spare parts list. These documents help the maintenance team understand what was supplied and how it should be operated.
I start with the line conditions:
A valve for clean natural gas may need a different seat material from a valve used on produced water. A valve for frequent modulation may also require a different design from a valve used only for isolation.
I avoid choosing by price alone. A lower purchase cost can lead to higher actuator requirements, more frequent seat replacement, or difficult field repair. A balanced selection compares purchase cost, installation needs, maintenance access, spare parts, and expected service conditions.
One common mistake is to specify only “Class 600 trunnion ball valve” and leave the rest open. That description does not define the seat material, fire-safe status, stem sealing, cavity relief, coating, actuator torque, or inspection level.
The purchase request should describe the service clearly. It should state whether the valve is for isolation, emergency shutdown, pigging service, high-temperature duty, abrasive media, or low-emission operation.
When I see a complete data sheet and matching test documents, I have a better basis for judging valve strength. The trunnion structure is valuable, but it works as part of a complete design. Body construction, seat behavior, stem sealing, actuator sizing, testing, and maintenance planning all shape the result.
When I help a plant team choose a ball valve for high-pressure service, I often hear the same concern: the valve must shut off firmly, operate without excessive force, and remain serviceable after repeated use.
A trunnion ball valve is designed around these needs. Its ball is supported by a lower stem, called the trunnion, while the upper stem transfers the actuator’s movement. This support reduces the load placed on the valve seats and helps the ball turn with steady movement.
That structure gives the valve a practical balance between strong shutoff and smooth operation.
In a floating ball valve, the ball moves slightly toward the downstream seat when pressure acts on it. This design works well in many applications, but the seat may carry more load as pressure and valve size increase.
A trunnion ball valve uses a fixed ball. The lower trunnion supports the ball, and the upper stem controls rotation. The seats move toward the ball instead of forcing the ball to move against the seats.
This arrangement can help reduce operating torque, especially on larger valves or systems with higher pressure. A smaller actuator may be suitable for some installations, but the final choice depends on pressure, temperature, fluid properties, valve size, and the required safety margin.
A valve may open and close only a few times each day, yet the operating torque still affects the whole system. High torque can require a larger actuator, stronger mounting parts, and more power. It can also make manual operation difficult during inspection or maintenance.
I look at several points when reviewing a trunnion ball valve:
A valve with low operating torque is not automatically the right choice. The seat material, seal arrangement, pressure rating, and actuator connection must match the service conditions.
Trunnion ball valves are often used in oil and gas systems, gas processing, petrochemical plants, power facilities, and industrial pipelines. They may handle gas, water, hydrocarbons, steam-related services, or other process fluids, depending on the selected materials and design.
The valve body may use a forged or cast construction. A forged body is often selected for applications that require a compact pressure boundary and high mechanical strength. A cast body may offer design flexibility for certain sizes and layouts. The right option depends on the project specification and inspection requirements.
The seats create the seal between the ball and the body. Common seat materials include reinforced PTFE, nylon, PEEK, and metal-to-metal designs. Each material has a working range. A soft seat may provide effective sealing for clean fluids, while a metal seat may be considered for high-temperature service or fluids containing solid particles.
I never treat seat material as a minor detail. A seat that performs well in clean natural gas may not suit abrasive slurry or a high-temperature process line.
Many trunnion ball valves are available with a double block and bleed arrangement. When the valve is closed, each seat can seal against the ball. The body cavity can then be vented or drained through a bleed connection.
This function can help operators check seat performance and release trapped pressure before maintenance. It does not remove the need for site isolation procedures. The pipeline design, lockout process, pressure verification, and local safety rules still control the work.
For systems that require cavity pressure relief, a self-relieving seat may be used. The valve specification should state how the seat behaves under pressure and which direction the pressure may move.
I use a simple review process when a customer asks for a trunnion ball valve.
1. Define the service
Record the fluid, pressure, temperature, flow direction, density, viscosity, and any solid content. Gas, clean water, crude oil, and abrasive process fluid create different demands.
2. Confirm the pressure class
The nominal size alone does not show whether the valve fits the pipeline. The pressure class and temperature rating must be checked together. A valve rated for one temperature range may have a lower allowable pressure at another temperature.
3. Select the body and trim materials
Carbon steel, stainless steel, duplex stainless steel, and alloy materials may be used for different services. Corrosion, hydrogen exposure, low-temperature impact needs, and fluid composition can affect the selection.
4. Review the seat design
Ask whether the valve uses soft seats, metal seats, fire-safe construction, anti-static protection, or an emergency sealant injection system. These features should relate to the process conditions rather than appear as a standard checklist.
5. Match the actuator
The actuator must provide enough torque for the full operating range. I also check the valve’s break torque, running torque, closing torque, supply pressure, fail position, and cycle time.
6. Check connection and installation details
Flanged ends, butt-weld ends, top-entry construction, side-entry construction, stem orientation, drain ports, and lifting points all affect installation. Space for actuator removal should be considered before the valve reaches the site.
A gas pipeline operator may need a 12-inch valve for a high-pressure line with remote operation. The valve may remain open for long periods and close only during isolation or an emergency signal.
For this service, the team may review:
The correct selection still depends on the project data. A valve that works on one gas line may need a different seal or material on another line with higher sulfur content, lower temperature, or more frequent cycling.
A trunnion ball valve needs a maintenance plan that matches its service. Operators can monitor leakage, actuator response, unusual noise, stem movement, and pressure changes across the valve.
During planned maintenance, the team may inspect:
The valve should be isolated and depressurized through the approved site procedure before inspection. Trapped pressure in the body cavity can remain even when the pipeline appears to be shut off.
Sealant injection may help manage some seat or stem leakage, but it should not replace correct repair work. Repeated leakage often points to a seat problem, damaged sealing surfaces, unsuitable materials, or operating conditions outside the original design.
A trunnion ball valve may become difficult to operate when the pipeline contains debris, the seat is damaged, the stem seal is too tight, or the actuator has been sized incorrectly. Long periods without movement can also make inspection more difficult.
Poor installation may create extra stress on the valve body or pipeline. Welding, alignment, support, and flushing practices deserve attention. Dirt left in the line can damage the seats during the first few operating cycles.
I prefer to review the full valve package rather than judge the valve by its body design alone. The ball, seats, stem, actuator, controls, materials, and installation method all affect performance.
A trunnion ball valve suits many high-pressure and large-size applications because its supported ball can help manage operating torque while maintaining controlled shutoff. The best result comes from matching the valve design to the fluid, pressure, temperature, operating cycle, and maintenance plan.
When those details are checked before purchase, the valve becomes easier to operate, easier to monitor, and more predictable during service.
A ball valve may look simple from the outside, yet its performance depends on several working parts moving together. When the valve is used in a water line, air system, oil circuit, or process pipeline, unstable operation can lead to leakage, pressure changes, and extra maintenance work.
I focus on three practical needs when selecting a ball valve: steady flow control, suitable operating force, and a service life that matches the working conditions.
A well-matched ball valve can support these needs through a solid body, a properly finished ball, reliable sealing parts, and an actuator or handle that fits the application.
The valve body needs to handle the pressure and temperature of the pipeline. A body made from stainless steel, carbon steel, brass, or another suitable material may be selected based on the fluid and operating environment.
The ball should rotate smoothly inside the body. A clean surface and accurate fit help reduce friction during opening and closing. This allows the operator or actuator to apply steady force instead of forcing the valve through a rough movement.
I pay close attention to the pressure rating before choosing a model. A valve designed for a low-pressure water line may not suit a high-pressure process system. The connection type also matters. Threaded, flanged, welded, and clamp connections serve different installation needs.
A ball valve normally uses soft seats, metal seats, or a combination of sealing parts. The right choice depends on the medium, temperature, pressure, and frequency of operation.
Soft seats are often used in water, air, and many general industrial systems. Metal seats may be considered for higher temperatures or conditions where soft materials may wear faster. The seat material must match the fluid. A seal that performs well with water may not be suitable for certain oils, chemicals, or abrasive media.
Leakage can also come from poor installation. Pipe debris may scratch the sealing surface. Excessive thread sealant may enter the valve. Misaligned piping may place stress on the body. I recommend cleaning the line, checking the connection, and supporting the pipe before the valve is operated.
Manual handles work well for smaller valves and systems with occasional operation. Larger valves or automated lines may use pneumatic or electric actuators.
The actuator should provide enough torque to move the ball through the full cycle. Too little torque may leave the valve partly open or closed. Too much force may increase wear on the stem, seat, or actuator parts.
A simple check helps avoid this problem:
For a water treatment line, an automated ball valve may open during a filter cycle and close when the system switches to another pipe. The valve may repeat this movement many times each day. A suitable actuator, correct seat material, and clean water supply can help the valve work with less mechanical stress.
A long service life does not come from the valve alone. The medium, pressure changes, temperature, operating frequency, installation quality, and maintenance plan all affect performance.
A valve used with clean water may experience less wear than one used with sand-filled water or a fluid containing solid particles. A valve in a heated process line may require different seals from a valve installed in a room-temperature pipeline.
I suggest recording a few operating details before placing an order:
These details help narrow the selection and reduce the risk of choosing a valve that only matches the pipe size.
Maintenance also has a direct effect on service life. Inspect the stem area for signs of leakage. Check whether the handle or actuator moves smoothly. Look for rust, unusual noise, pressure loss, or delayed shutoff. A valve that shows a small change in operation may need attention before the issue affects the whole line.
I prefer to treat a ball valve as part of the pipeline system rather than as an isolated component. The right material, sealing design, actuator, connection, and maintenance routine should work together. When these points are checked before installation, the valve has a better chance of delivering stable control and dependable service throughout its planned operating period.
We has extensive experience in Industry Field. Contact us for professional advice:Wang Zhixiang: 241126365@qq.com/WhatsApp +8613777730323.
References
American Petroleum Institute 2014 Pipeline Valves API Specification 6D
American Society of Mechanical Engineers 2022 Valves Flanged Threaded and Welding End ASME B16.34
International Organization for Standardization 2015 Industrial Valves Measurement Inspection and Testing ISO 5208
American Petroleum Institute 2017 Fire Test for Quarter-Turn Valves and Valves with Nonmetallic Seats API 6FA
International Organization for Standardization 2015 Industrial Valves Fugitive Emissions ISO 15848
American Petroleum Institute 2019 Fire Test for Soft-Seated Quarter-Turn Valves API 607
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