Check valves are essential devices, yet they serve a necessary purpose in many pneumatic circuits.

A check valve is a device that only allows the flow of fluids in one direction.
They have two ports, one as an inlet for the media and one as the output for the media.

They can also be used as a bypass valve, allowing media around components such as needle valves that restrict flow in both directions.

Check valves rely on a pressure differential to work. They require a higher pressure on the input side of the valve than the output side to open the valve. When the pressure is higher on the outlet side, or the input side pressure is not high enough, the valve will close. Depending on the valve type, the closure mechanism is different.

Unlike other valves, they do not need a handle, lever, actuator, or
human to work correctly. They are commonly installed in applications that backflow would cause an issue. However, since they are non-return valves, they are a cheap, effective, and easy solution to solve a potential problem.

There are various sizes, designs, and materials to ensure a check valve for every application.
Common uses for check valves include:
• Industrial processes, including fluid system in chemical and power plants
• Aerospace applications, including aircraft hydraulic systems
• Applications where multiple gases are mixed into a single stream
• Irrigation sprinklers and drip irrigation systems
• Home heating systems
• Rainwater harvesting systems connected to the main water supply

Pneumatic check valves rely on airflow to function and are designed with a specified cracking pressure, which is the minimum pressure required for the valve to operate.

Pneumatic check valves are commonly used in vacuum breakers, steam lines, cooling towers, HVAC systems, sump pumps, pressure pumps, boilers, and more.

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Typical Industry Applications:
• Oil Production Start-Up/ Shut-Down
• Gas & Condensate Production
• Gas Injection
• Gas Lift
• Pump Discharge
• Overboard Dump Applications
• Chemical Injection
• Fracturing Clean-Up
• Methanol Injection
• Flaring

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