basic 2 min read
Valves Body Materials and Available End Connections
Bonnet or Cover Bolting. Bolting includes bolts, nuts, and washers. The bolting to be used must be made from materials…
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Major Valve Parts
Pressure Retaining Parts Valve body, bonnet or cover, disc, and body-bonnet bolting are classified as pressure retaining parts of a…
basic 3 min read
Cold Working Pressure (CWP) Rating.
Valves are also rated by the CWP rating. This rating represents the maximum allowable working pressure at the ambient temperature…
basic 3 min read
Classification of Valves
The following are some of the commonly used valve classifications: Classification Based on Mechanical Motion Based on the mechanical or…
basic 1 min read
Reference Codes and Standards
The following is a list of commonly used valve standards in the United States. Based upon the scope, each of…
basic 3 min read
Valve Terminology – IV
Safety-relief valve: A pressure-relief valve characterized by rapid opening pop action, or by opening generally proportional to the increase in…
basic 3 min read
Valve Terminology – III
Half stellited: A valve is termed half stellited when only the seating surfaces of the valve seat(s) are hard faced…
basic 3 min read
Valve Terminology – II
Cavitation: This occurs when the fluid pressure at the vena contracta falls below the vapor pressure, followed by pressure recovery…
basic 2 min read
Valve Terminology
Actuator: A device that operates a valve by utilizing electricity, pneumatics, hydraulics, or a combination of one or more of…