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ISO - International Organization
for Standardization

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Diaphragm Valve Terms

Actuators - Controls that switch the position of a valve from open or partially open to partially or completely closed. Actuator operation may be manual, pneumatic or hydraulic.

Backpressure - The pressure at the outlet of a relief valve, caused by pressure in the discharge system. Pressures may be constant or variable.

Bellows - A sealing device that prevents leaks between the valve stem and the body of the valve.

Bonnet - A cover fitted over the valve body, which may be removed for valve maintenance.

Cracking Pressure - The pressure at which leaks start to flow through a valve.

EPDM - Ethylene propylene diene monomer. EPDM is a commonly used rubber seal material that is compatible with many chemicals.

Flange - A type of pipe fitting that attaches with nuts and bolts.

Flare - A pipe fitting that uses a socket and a union nut to form a connection. Flares are one of the most crevice-free pipe fittings and may be used for ultrapure processes.

GPM - Gallons per minute. Used to measure flow through a pipe, valve, inlet or outlet.

O-ring - A rubber seal with an “o” shape, used to seal connections between pipes and valves.

Ports - Passages that allow flow into and out of a valve.

Set Pressure - The pressure from an inlet that a valve is adjusted to open, maintain or control under service conditions.

Stem - A rod that spans the inside and outside of a valve, transmitting motion to control the internal disc, which moves to seal or unseal the valve.

U-cup - A seal formed into a u-shaped channel. This type of seal may be used when an O-ring is not desirable.