basic 2 min read
Check Valves
Check valves are designed to pass flow in one direction with minimum resistance and to prevent reverse or backflow with…
THE ARCHIVES
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Needle Valves
Needle valves generally are used for instrument, gauge, and meter line service. Very accurate throttling is possible with needle valves…
basic 3 min read
Construction of a Globe Valve
A typical large globe valve with flanged ends is illustrated in Fig. A10.11, and a large wye-pattern globe is illustrated…
basic 2 min read
Globe Valves
Conventional globe valves may be used for isolation and throttling services. Although these valves exhibit slightly higher pressure drops than…
basic 2 min read
Pressure Binding
Sometimes in high-temperature applications, the flow medium, such as water or steam, is trapped in the valve bonnet area when…
basic 6 min read
Construction of a Gate Valve
Gate valves consist of three major components: body, bonnet, and trim. The body is generally connected to the piping by…
basic 2 min read
Valve Types
Gate Valves Gate valves are primarily designed to serve as isolation valves. In service, these valves generally are either fully…
basic 3 min read
Valve Categories
Stop (Isolation) Valves As the name implies, stop valves are used to stop flow or isolate a portion of the…
basic 3 min read
Stem Packing
Stem packing performs one or both of the following two functions, depending on the application: ● Prevent leakage of flow…
basic 2 min read
API Trim Materials
Rising Stem with Inside Screw. The threaded part of the stem is inside the valve body, and the stem packing is…
basic 3 min read
Non-pressure Retaining Parts.
Valve seat(s), stem, yoke, packing, gland bolting, bushings, handwheel, and valve actuators are some of the major non- pressure retaining…
basic 1 min read
Selected Materials of Construction for Valves
Valve trim parts may be constructed of assorted materials because of the different properties needed to withstand different forces and…