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Check Valve Terms

Actuator – A part of a regulating valve that converts various forms of energy (electrical, fluid, etc.) into mechanical motion to open or shut the valve seats.
 
Backflow – A system’s reversal of normal flow resulting from an increase in the downstream pressure exceeding that of the supply pressure.
 
Back Pressure –The pressure that is the result of a restriction of the main flow, caused by gravity, pumps, or restrictions on the pipe; measured in inches H20 or PSI.
 
Elastomer – A material that can be stretched or distorted but will return to its original shape.
 
Extended Bonnet – Device used when the material running through a pipe or a valve is at high or low temperatures. This device helps prevent damage to the sealing materials.
 
Fluid Power –Power that is used to provide motion and force to mechanisms by applying, generating, and controlling pumped or compressed liquids or gases; this term also encompasses hydraulics and pneumatics.
 
Penstock Valve – A gate valve often found in waste water treatment plants. It is used to contain fluids.
 
Pilot Valve – A small valve which operates a larger valve with very little power necessary for use; utilized when the system requires the no-return characteristic of a valve for only a portion of the cycle.
 
Pneumatic – Operated or pressurized by air or other gases.
 
Pneumatic Actuator – A device that utilizes pneumatic energy to regulate or open/close the valve. A spring that is used solely to open the valve, will normally be fitted inside a valve which allows the valve to return to the closed position.
 
Poppet – A valve that moves up to or from its seat perpendicularly.
 
Positioner – Makes certain the closing device of the valve stays in the correct position.
 
Pressure Differential – Pressure difference in a valve between the inlet and the outlet.
 
Pressure Spike – A quick pressure rise.
 
PSI (Pounds Per Square Inch) – A unit of pressure; equivalent to the metric unit of Kilonewtons per square centimeter.
 
Tank Valve – A valve that is able to be inserted into the bottom of a tank.
 
Valve Seat – A stationary part of the valve which restricts fluid or gas flow when it comes in contact with the movable portion of the valve.