Trusted Piston Check Valve Manufacturer
NTVAL provides durable Piston Check Valves designed for reliable performance in tough industrial settings. We meet high standards with a focus on efficiency and offer customizable solutions tailored to your project needs.
Reliable Piston Check Valves
The Piston Check Valve is a valve designed to control flow direction in a pipeline, using a spring-loaded piston to open or close based on fluid movement. When fluid flows forward, the piston lifts, allowing it to pass freely. If the flow tries to reverse, the piston quickly lowers, blocking backflow and protecting the system.
This type of valve is particularly effective in applications with varying pressure levels, as the piston movement adapts to changes without causing major flow disruptions. Its sturdy, straightforward design makes it ideal for reliable, long-lasting performance in various industries.
Quality Control
The PMI Test verifies the metal type in the Piston Check Valve, confirming that all materials match the required industry standards.
PMI Test
The Sealing Test checks if the Piston Check Valve closes tightly, preventing leaks and ensuring stable, controlled flow for various applications.
Sealing Test
This test detects any potential leaks in the Piston Check Valve, helping it meet environmental standards by minimizing harmful emissions.
Low Emission Test
The Impact Test examines the Piston Check Valve’s ability to withstand sudden force, confirming its durability in demanding environments.
Impact Test
During Dimension Inspection, each component of the Piston Check Valve is measured to confirm precise size, shape, and fit within the system.
Dimension Inspection
The Painting Thickness Test measures coating depth on the valve, making sure it resists corrosion while maintaining a smooth operation.
Painting Thickness Test
PT detects tiny surface cracks on the Piston Check Valve, identifying any flaws that might impact its performance in the field.
PT
Material Inspection assesses the strength and quality of the valve’s materials, confirming that it meets industry standards for safety and reliability.
Material Inspection
Our Valve Applications in Key Industries
Discover how our advanced valve solutions improve flow control, delivering enhanced efficiency, safety, and strict quality assurance.
The Piston Check Valve handles chemicals safely, preventing dangerous backflow and helping maintain safe, reliable flow control in chemical plants.
Chemical Processing
For the petrochemical industry, the Piston Check Valve stops backflow, protecting equipment when dealing with fuels, oils, and other volatile substances.
Petrol Chemical
The Piston Check Valve provides high reliability in extreme conditions, essential for preventing reverse flow in critical nuclear power applications.
O.P.G & Nuclear
In the pulp industry, the Piston Check Valve regulates flow direction, helping reduce waste and keep production lines moving smoothly.
Pulp
The Piston Check Valve suits the mining industry by stopping backflow under harsh conditions, helping ensure safe and efficient fluid control.
Mining
In water and sewage systems, the Piston Check Valve blocks contaminants and prevents backflow, safeguarding water quality and flow consistency.
Water & Sewage
The Piston Check Valve controls steam flow, preventing backflow that could disrupt operations, protecting equipment from damage in steam systems.
Steam System
For boiling systems, the Piston Check Valve keeps the flow steady, helping control pressure and temperature, essential for safe operations.
Boiling System
Get More Versatile Valve
Dimension
Piston Check Valve
- Cast Steel Check Valve, Lift Piston
- Bolted Cover, Horizontal or Vertical Lines
- Integral or Removable Seat, Metal to Metal
- Designed to ASME B16.34, API 6D
| Face to Face | ASME/ANSI B16.10 |
| End Flange | ASME/ANSI B16.5 |
| Butt Weld | ASME/ANSI B16.25 |
| Class | ASME/ANSI CL150~CL900 |
| CLASS 150 DIMENSION | |||||||
SIZE (in.) | 2″ | 3″ | 4″ | 6″ | 8″ | 10″ | 12″ Unit:inch |
| A RF | 10.5 | 12.5 | 14 | 17.5 | 19.5 | 24.5 | 27.5 |
| RTJ | 11.13 | 13.13 | 14.63 | 18.13 | 20 | 25 | 28 |
| B RF | 5.25 | 6.25 | 7 | 8.75 | 9.75 | 12.25 | 13.75 |
| RTJ | 5.56 | 6.56 | 7.31 | 9.06 | 10 | 12.5 | 14 |
| C | 6.5 | 8 | 11.25 | 16.13 | 16.75 | 18.5 | 22.5 |
| D | 7 | 8.25 | 9.75 | 11.75 | 14.5 | 17 | 24 |
| CLASS 300 DIMENSION | |||||||
SIZE (in.) | 2″ | 3″ | 4″ | 6″ | 8″ | 10″ | 12″ Unit:inch |
| A RF | 10.5 | 12.5 | 14 | 17.5 | 21 | 24.5 | 28 |
| RTJ | 11.13 | 13.13 | 14.63 | 18.13 | 21.63 | 25.13 | 28.63 |
| B RF | 5.25 | 6.25 | 7 | 8.75 | 10.5 | 12.25 | 14 |
| RTJ | 5.56 | 6.56 | 7.31 | 9.06 | 10.81 | 12.56 | 14.31 |
| C | 6.5 | 8 | 11.25 | 16.13 | 16.75 | 18.5 | 22.5 |
| D | 7 | 8.25 | 9.75 | 11.75 | 14.5 | 17 | 24 |
| CLASS 600 DIMENSION | |||||||
SIZE (in.) | 2″ | 3″ | 4″ | 6″ | 8″ | 10″ | 12″ Unit:inch |
| A RF | 11.5 | 14 | 17 | 22 | 26 | 31 | 33 |
| RTJ | 11.63 | 14.13 | 17.13 | 22.13 | 26.13 | 31.13 | 33.13 |
| B RF | 5.75 | 7 | 8.5 | 11 | 13 | 15.5 | 16.5 |
| RTJ | 5.56 | 7.06 | 8.56 | 11.06 | 13.06 | 15.56 | 16.56 |
| C | 6.75 | 8.25 | 11.5 | 16.38 | 16.75 | 18.5 | 22.5 |
| D | 7 | 8.25 | 9.75 | 11.75 | 14.5 | 17 | 24 |
| CLASS 900 DIMENSION | |||||||
SIZE (in.) | 2″ | 3″ | 4″ | 6″ | 8″ | 10″ | 12″ Unit:inch |
| A RF | 14.5 | 15 | 18 | 24 | 29 | 33 | 38 |
| RTJ | 14.63 | 15.13 | 18.13 | 24.13 | 29.13 | 33.13 | 38.13 |
| B RF | 7.25 | 7.5 | 9 | 12 | 14.5 | 16.5 | 19 |
| RTJ | 7.31 | 7.56 | 9.06 | 12.06 | 14.56 | 16.56 | 19.06 |
| C | 7 | 8.5 | 11.88 | 16.75 | 16.75 | 18.5 | 22.5 |
| D | 7 | 8.25 | 9.75 | 11.75 | 14.5 | 17 | 24 |
Pressure Loss Curves for Piston Check Valves Flow Rate (Gallons Water Per Minute)
What is a Piston Check Valve?
A piston check valve is a type of valve that stops fluid from flowing backward. It works automatically, so it doesn’t need any extra parts to make it function. Manufacturers design this valve to let fluid move in only one direction. Inside, there’s a part called a dash-pot, which includes a cylinder and a piston. This helps the valve work smoothly. The piston has guides to keep everything lined up correctly when the valve closes.
Fluid enters the valve from below the valve disc. This design uses the fluid’s pressure to lift the disc, letting the fluid flow through. When the fluid tries to flow backward, the valve closes, with help from the disc’s weight and gravity.
Manufacturers make different types of piston check valves for different uses. For example, valves used in low-temperature settings have seats made from soft materials like rubber or plastic. Valves for high temperatures have seats made from metals like brass, bronze, or steel.
Components of a Piston-type Check Valve
Valve body
The valve body is the part of the piston check valve that holds all the internal parts. It’s made from strong materials like ductile iron, cast iron, stainless steel, and carbon steel. The valve body also acts as the main barrier to keep the fluid pressure inside. It has inlet and outlet ports where the fluid enters and exits the valve, connecting it to the piping system.
Bonnet
The bonnet is the top part of a piston check valve. It sits on top of the valve body, and they are connected using bolts and nuts, threads, or welds. Welded and bolted connections are great for high-pressure situations because they create a strong seal.
Threaded connections use screws to join the body and bonnet. While welding provides an even tighter seal, it can make it difficult to open the valve in the field for inspection, cleaning, or repairs.
Disc
This part of a piston check valve is responsible for opening and closing the valve.
Spring
The spring helps close the valve as soon as the suction pressure begins to decrease.
Seat
This part serves as a seal between the valve body and the disc to prevent fluid from leaking.
How does a Piston Check Valve Work?
Figure: Working of a piston check valve in open state (left side) and closed state (right side).
A piston check valve works by using pressure differences. The valve opens when the fluid pressure is higher than the outlet pressure, lifting the disc off the seat and allowing fluid to flow. The fluid continues to flow until the suction pressure drops. At that point, the fluid may start to reverse direction, moving from the outlet back toward the suction side due to lower inlet pressure.
However, piston check valves are designed to be highly sensitive to pressure changes, so they close immediately before significant fluid can flow backward. This quick response prevents damage to equipment like boilers or pumps and avoids issues like contamination. Because of these features, piston check valves are essential in certain industrial applications.
Types of Piston Check Valves
Z-shaped Piston Check Valve
This piston check valve has a Z-shaped partition inside, where the valve seat is mounted. It’s one of the simplest and most popular designs. The seat is arranged horizontally, allowing the disc to move perpendicular to the pipeline. The Z-shaped design makes maintenance, installation, and cleaning easier.
Y-loaded Piston Check Valve
This piston check valve has a disc positioned at a 45-degree angle to the horizontal axis. This design allows for inspection and cleaning without disconnecting the valve from the piping system. It works the same way as the Z-shaped piston check valve, but in this Y-loaded type, the piston moves up and down at a 45-degree angle. However, this valve is heavier and requires more space for installation.
Flanged End Piston Check Valve
This piston-type check valve is connected to the pipeline using bolts and nuts. It has flanged ends with holes that align with the flanged ends of the pipe, allowing for a secure connection. A gasket is placed between the valve and the pipe to ensure a tight seal, preventing fluid leakage. There are three types of flange faces: ring type, raised face, and flat face. The ring type is used for high-pressure applications.
Most piston-type check valves have flanged ends, making them easy to install and remove for maintenance or replacement. The multiple bolts and nuts create a strong connection with less torque needed compared to other valves, ensuring a leak-free seal. However, these valves are heavier due to the added weight of the bolts, nuts, and flanged ends.
Threaded End Piston Check Valve
This piston check valve is connected to the pipe using threads. Manufacturers design it with either female or male threads. A valve with male threads connects to a pipe with female threads. These threaded-end piston valves are usually smaller than flanged-end types and are designed for low to medium pressure applications. They are easy and quick to install and assemble.
Welded End Piston Check Valve
This piston-type check valve is connected to the pipe using the welding method. Both the valve and pipe are made from compatible materials to ensure high strength after welding. They are ideal for high-pressure applications because the welding creates a very tight seal, making it nearly impossible for fluid to leak. However, once welded, the valve cannot be opened for inspection, repair, or cleaning in the field.
Manufacturers design these valves for use in applications where frequent maintenance isn’t needed or where the fluid is hazardous, such as acids or combustible materials like oil and gas. Welded end piston-type check valves are lighter than flanged end types and can range in size from small to large, depending on the application.
Applications of Piston Check Valve
Oil and Gas Industry Applications
Piston check valves are used in the oil and gas industries.
Freshwater Supply Systems
Piston-type check valves are used in freshwater supply systems.
Wastewater Treatment Plants
They are used in wastewater treatment plants.
Steam Power Generation
They control feed water in steam power generation plants.
Pharmaceutical Manufacturing
These valves are used in pharmaceutical manufacturing.
Chemical Manufacturing
They are used in chemical manufacturing.
Food and Beverage Processing
Piston-type check valves are used in food and beverage processing.
Air-Conditioning Systems
These valves prevent reverse flow in air-conditioning systems.
Advantages of Piston Check Valves
Durability and Reusability
Piston-type check valves are durable and can be used for a long time without needing replacement. They are also repairable, making them reusable after a breakdown.
Versatility in Industrial Applications
Piston check valves are versatile and can be used in various industrial applications.
Prevention of Reverse Flow
These valves prevent reverse fluid flow, helping to avoid contamination and protect equipment like boilers and pumps from damage.
Cost-Effective Automation
They are automatic, eliminating the need for a valve operator or actuator, which saves on costs.
Suitability for High-Pressure and Temperature Applications
These valves are suitable for high-pressure and high-temperature applications.
Low-Pressure Drop for Energy Efficiency
They have a low-pressure drop, improving pumping efficiency and saving energy.
Quick Operation
Piston check valves operate quickly with no fluid leakage.
Pressure Maintenance in Piping Systems
They can maintain the necessary pressure levels throughout the piping system.
Ease of Installation
These valves are easy to install, repair, and maintain.
Disadvantages of Piston Check Valves
- Piston-type check valves allow fluid to flow in only one direction.
- These valves are not suitable for applications with pulsating fluid flow.
- They can cause water hammer issues.
Troubleshooting a Piston Check Valve
Fluid leakage from the valve pipe connection
- The bolts or screws are loose. Tighten the connection.
- The gasket is worn out. Replace the gasket.
- The O-rings are damaged or worn out. Replace the O-rings.
No fluid flow through the piston check valve
- The valve is installed in the wrong direction. Remove it and reconnect according to the manufacturer’s instructions.
- The pipe connected to the piston check valve is blocked. Inspect the pipe and remove any material obstructing fluid flow.
Fluid leakage when the valve is fully closed
- Solid particles are lodged in the piston check valve. Clean the valve to remove the blockage.
- The O-rings are damaged. Replace the O-rings.
- The valve seat is damaged. Replace the valve seat or the entire valve.
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Additional General Insights Here
Specs of Piston Check Valve
Body Material
Piston Check Valves are made from strong materials like stainless steel and carbon steel. And on top of that, these materials make the valves durable and long-lasting, suitable for various industrial uses. The high-quality metals allow the valves to work well in tough conditions and over long periods.
Size and Dimensions
These valves come in various sizes, typically from 1/2 inch to 24 inches in diameter. These sizes are designed to fit standard pipes, making installation easy. This range of sizes allows the valves to be used in different projects, meeting various flow needs efficiently. At NTVAL, we can offer different valve sizes that will suit specific piping systems.
Pressure Ratings
It can handle a wide range of pressures, usually from 150 psi to 1500 psi. This makes them suitable for many industrial uses where controlling backflow is important. The ability to handle different pressures means they can perform reliably in various situations.
Features of Piston Check Valve
Compact Design
The compact design of these Piston Check Valves allows for easy installation even in tight spaces. This feature is especially useful in systems where space is limited or where additional components need to be fitted. The compact size does not compromise the valve's functionality, making it a practical choice for various installations.
Non-Slam Design
Piston Check Valves feature a non-slam design, which prevents sudden closure and reduces the risk of water leakage in the system. The piston moves gradually to its closed position, minimizing shock and noise, and protecting the piping system from potential damage.
Leak-Proof Seal
These valves are equipped with a reliable sealing mechanism that prevents leaks. I discovered that the precision-engineered components and high-quality materials guarantees a tight seal, even under high pressure. At NTVAL, we can guarantee that our valves have this leak-proof feature for maintaining system integrity and preventing fluid loss.
Benefits of Piston Check Valve
Reduced Maintenance Costs
The durable construction and low-maintenance design of Piston Check Valves results in fewer service requirements. It reduces maintenance costs and downtime, making these valves a cost-effective option for long-term use in various industrial applications, including chemical plants and oil refineries.
Increased Safety
By preventing backflow, these valves play a crucial role in enhancing system safety. They protect equipment and piping systems from potential damage caused by reverse flow, which can lead to costly repairs and safety hazards. This benefit is especially important in high-risk industries.
Easier Installation
The compact and versatile design of Piston Check Valves allows for easy installation in different system configurations. Whether being integrated into new systems or retrofitted into existing ones, these valves are straightforward to install, saving time and reducing labor costs.
Applications of Piston Check Valve
Petrochemical Industry
In the petrochemical industry, Piston Check Valves are essential for managing the flow of gases and liquids used in production processes. They prevent backflow that could lead to contamination or equipment wear, which is crucial in systems handling corrosive or volatile chemicals. Their dependable operation helps maintain a safe and efficient environment in petrochemical facilities.
Power Generation
In power generation plants, Piston Check Valves are used to control the flow of steam, water, and other fluids. They help maintain the stability of the system and prevent backflow, which can cause equipment malfunctions and reduce efficiency. These valves are essential for the reliable operation of power plants. If you are in this industry and looking for the best Piston Check Valves, choose NTVAL.
Oil and Gas Industry
These valves are widely used in the oil and gas industry to prevent backflow in pipelines and processing systems. They help maintain the integrity of fluid transfer, protecting pumps and other equipment from potential damage caused by reverse flow. Here’s the bottom line, this application is critical for maintaining operational safety and efficiency.
Mining Industry
In the mining industry, Piston Check Valves play a critical role in handling slurry and other abrasive materials. They are used to regulate the flow of water, chemicals, and mined materials in various processes. These valves prevent backflow, providing smooth and efficient operation of mining equipment and systems.
Considerations When Buying Piston Check Valve
01
Horizontal/Vertical Orientation
When buying a Piston Check Valve, confirm whether it can be installed in either a horizontal or vertical orientation. This is crucial because some valves perform better in specific positions. For example, if your system has vertical piping, make sure that the valve is compatible to avoid performance issues.
02
At least 1 Year Warranty Period
Look for valves with at least a 1-year warranty. I believe this warranty period is important as it covers manufacturing defects and provides peace of mind. A warranty can save from unexpected repair or replacement costs if the valve fails within the first year. At NTVAL, our general guarantee period is 18 months from the delivery date.
03
Low Emission Packing
Look for low emission packing when choosing a Piston Check Valve. This feature helps reduce leaks and minimizes environmental impact. For example, if your system handles hazardous fluids, low emission packing of valves is important to prevent harmful leaks, protecting both the environment and your facility’s safety standards
FAQ's
Yes, we provide test reports and performance data for Piston Check Valves with a 3.1 certificate for free. We send the certificate for your approval before delivery.
At NTVAL, we have a detailed quality control system that includes production, testing, and inspection stages. This process ensures the reliability, durability, and performance of our Piston Check Valves.
We offer technical assistance to troubleshoot any issues with Piston Check Valves. We provide guidance on valve operation and can send parts or a new valve for replacement. Repairs or replacements are available within the warranty period.
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