basic

Cold Working Pressure (CWP) Rating.

Valves are also rated by the CWP rating. This rating represents the maximum allowable working pressure at the…

Valves Covered by MSS Standards

Classification of Valves

The following are some of the commonly used valve classifications: Classification Based on Mechanical Motion Based on the…

Part 1 Selection and Application of Valves

Reference Codes and Standards

The following is a list of commonly used valve standards in the United States. Based upon the scope,…

Valve Terminology – IV

Safety-relief valve: A pressure-relief valve characterized by rapid opening pop action, or by opening generally proportional to the…

Valve Terminology – III

Half stellited: A valve is termed half stellited when only the seating surfaces of the valve seat(s) are…

Valve Terminology – II

Cavitation: This occurs when the fluid pressure at the vena contracta falls below the vapor pressure, followed by…

Valve Terminology

Actuator: A device that operates a valve by utilizing electricity, pneumatics, hydraulics, or a combination of one or…

Selection and Application of Valves

Valves are an essential part of any piping system that conveys liquids, gases, vapors, slurries and mixtures of…