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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 Wall Thickness The thickness of the wall of a pressure vessel or of a pipe. Water Hammer The physical effect often accompanied by loud banging produced by pressure waves generated within the piping by rapid change of velocity in a liquid system. WE (Weld End) The end connection of a valve which is 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 Valve A device which controls or isolates the flow of a liquid or gas in a conduit or pipeline. Variable Orifice A small variable profile valve put in a flow line and used with a pilot to restrict the flow into the pilot and make the pilot more or less sensitive to changing conditions. … 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 Ultrasonic Test A non-destructive inspection procedure using high frequency sound waves to detect voids and imperfections throughout the thickness of metal parts. Techniques and procedures are covered in ASME V, Art. 4, Art. 5, and ASTM A388, A435 and A577. Unidirectional Valve Valve designed for blocking the flow in one direction only. Union Connection … 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 Tee Piece A pipe or tubing fitting with a side outlet at right angles. Resembles a T. Tensile Strength The maximum amount of tensile stress (ultimate strength) that a material can withstand before failure or rupture occurs. It is the maximum stress developed in a material in a Tensile Test. Tensile Test A 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 Safety Factor Is a factor applied to the nominal operating torque or thrust given by the valve manufacturer. Can be between 1.2 and 2.0 depending on application. Safety Relief Valve A quick-acting spring-loaded valve that opens (relieves) when the pressure exceeds the spring setting. It specifically opens proportionally with pressure increasing. Often installed on … 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 Ra (Roughness: Arithmetic Average Deviation) It is the arithmetic average of the absolute values of the profile deviations from the mean line of the roughness profile. Statistically very stable repeatable parameter good for random type surface such as grinding. Not a good measure of sealed surfaces. Reduced Port (Bore) See Venturi Valve. Regulator A … Read more