Information about Check Valves

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About Check Valves

Check valves are self-activating safety valves that permit gases and liquids to flow in only one direction, preventing process flow from reversing. They are classified as one-way directional valves. Fluid flow in the desired direction opens the valve, while backflow forces the valve closed. The mechanics of check valve operation are relatively simple. Most check valves contain a ball that sits freely above the seat, which has only one through-hole. The ball has a slightly larger diameter than that of the through-hole. When the pressure behind the seat exceeds that above the ball, liquid is allowed to flow through the valve; however, once the pressure above the ball exceeds the pressure below the seat, the ball returns to rest in the seat, forming a seal that prevents backflow.

Products & Services Related to Check Valves

Air Pressure Regulators

Air pressure regulators control pressure in air lines (usually adjustable) to remove fluctuations and maintain consistent pressure for pneumatic devices.

Air Valves

Air valves allow metered fluid flow in one or both directions. They are used in pneumatic circuits to regulate the rate of activation or exhaust of cylinders and other pneumatic devices.

Control Valves

Control valves or proportional valves are power-operated devices used to modify fluid flow or pressure rate in a process system.

Diaphragm Valves

Diaphragm valves close by means of a flexible diaphragm attached to a compressor.

Plastic Valves

Plastic valves are made from plastic materials and are used in applications that require corrosion resistance and/or chemical handling.

Pressure Regulators

Pressure regulators are used to maintain a constant outlet pressure or flow.

Sanitary Valves

Sanitary valves are designed for applications requiring clean or sterile processing.

Engineering Web: Check Valves - Machine Design

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Check Valves Ease Turbine Maintenance \| Machine Design Check Valves Ease Turbine Maintenance May 11, 2006
New Products: Check Valves and Fixed-flow Controls \| New line... New Products: Check Valves and Fixed-flow Controls Appears in Print As: Check Valves and Fixed-flow Controls
Miniature Check Valves \| Machine Design Miniature Check Valves August 4, 2005 Staff Brass or stainless-steel miniature check valves and fixed-flow controls are available.

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