A–B–C–D–E–F–G–H–I–J–K–L–M–N–O–P–Q–R–S–T–U–V–W–X–Y
OD (Outside Diameter)
The measurement of the outermost diameter of a circular part.
Operator
A device which converts manual, hydraulic, pneumatic or electrical energy into mechanical motion to open and close a valve. Also called a Valve Actuator.
O-Ring
An elastomeric or synthetic seal ring of circular cross section.
Operating Temperature
A media temperature that the valve is operating in and will be required to be opened or closed at any time in this temperature range.
Operating Time
The time required for a power operator to stroke the valve from the full open to full closed position or vice versa.
OS & Y (Outside Screw & Yoke)
A valve in which the fluid does not come in contact with the stem threads. The stem sealing element is between the valve body and the stem threads.
Outlet Port
The port which is connected directly to the downstream side of a fluid system.
Override
A manual mechanical or hydraulic device fitted to an actuator for operating the valve when the normal motive power is not available.