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Butterfly Valve Terms

Actuator – The part of a valve that converts electrical, fluid or thermal energy into mechanical energy in order to open/close the valve.

Aeration – The process of mixing air with a high content of oxygen into a liquid. Carburetor butterfly valves go through aeration when mixing oxygen with fuel.

Backpressure – Force on the upstream part of a butterfly valve or valve seat.

Bearing – A support typically used in conjunction with butterfly valves to hold the revolving shaft in its appropriate position.

Blind Flange – A solid plate-like fitting used to seal a flanged end pipe’s end.

Bonnet – The part of a valve that connects the body to the valve actuator. The bonnet sometimes includes the stem packing.

Breakaway (Unseating) Torque – The turning force required to rotate the closure element of a butterfly or rotary valve.

Flange – The rim at the end of a fitting, pipe or valve that allows for bolting onto an additional pipe element.

Flow Meter (http://www.flow-meters.biz) – A device used to read and signify the flow rate of a material.

Flow Rate – The weight, mass or volume of a gas, liquid or solid through a medium per unit of time.

Gate Valve – A valve similar to a butterfly valve. Gate valves are not used in throttling applications because they are either entirely open or entirely closed.

Inlet – Area of a valve through which fluid enters.

Leakage – The amount of fluid that passes through a valve while it is in the off position. The most common unit for measuring leakage is in volume/time.

Outlet – The opening in a valve through which fluid exits.

Pounds per Square Inch (PSI) – A unit of measurement that signifies the level of pressure of a liquid, solid or gas in a valve system.

Recovery – The amount of pressure in a flow stream that is reduced as a direct result of the design of the control valve. Recovery is also described as the ratio of maximum downstream pressure to upstream pressure.

Seating Torque – The value of the turning force that is needed to close a valve.

Slip on Flange – A flange that slides over the end of piping and is then welded in place.

Throttling – Regulation of flow or current through a valve.

Trim – The inner parts of a valve that are in contact with the flow stream.

Valve Body – The main part of a valve that contains passages for the flowing material.

Variable Speed – Term for when an actuator is able to provide a slower operating time over the entire range of operation.

Vena Contracta – The area of a valve at which the flow stream is the slowest, usually downstream of the physical constriction.