admin 
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 K-Mass An epoxy-based intumescent coating to provide fire protection. Works by endothermic reaction rather than insulation. Key Stop A method of restricting the travel of a ball valve from fully open to fully closed and vice versa. The stem key bears against the ends of an arc machined in or attached to the adaptor … Read more
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 Jog A function that provides momentary operation of an actuator to achieve a small movement of the valve.
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 ID (Inside Diameter) The measure of the inner diameter of a circular part. IDS (Instrument Data Sheet) A table summarizing data such as service, valve size, supply pressure, etc., necessary for actuator sizing. In Situ (Maintenance) To maintain or repair equipment “in its original place” such as a top-entry ball valve. Incremental Seat Test … Read more
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 Hammer Blow In electric actuators, it is a lost motion mechanism to allow a motor to reach full speed before engaging the gear drive. Provides a higher efficiency for overcoming valve break torque, but it does not produce more torque than the nominal actuator rating. Handpump Manually operated hydraulic pump used to provide hydraulic … Read more
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 Galling A form of surface damage arising between sliding solids, distinguished by macroscopic usually localized roughening and creation of protrusions above the original surface it often includes plastic flow or material transfer or both. The onset of galling usually requires that the contact pressure exceeds some threshold value. Galling can be a precursor to … Read more
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 Fabricated Valve A valve in which the body is neither cast nor forged but rather is formed from plate or pipe welded together. Face-to-Face The overall dimension from the inlet face to the outlet face of the valve (one end to the other). This dimension is governed by ASME B16.10 and for pipeline valves, … Read more