basic

Construction of a Gate Valve

Gate valves consist of three major components: body, bonnet, and trim. The body is generally connected to the…

Valve Types

Gate Valves Gate valves are primarily designed to serve as isolation valves. In service, these valves generally are…

Valve Categories

Stop (Isolation) Valves As the name implies, stop valves are used to stop flow or isolate a portion…

Stem Packing

Stem packing performs one or both of the following two functions, depending on the application: ● Prevent leakage…

API Trim Materials

Rising Stem with Inside Screw. The threaded part of the stem is inside the valve body, and the stem…

Non-pressure Retaining Parts.

Valve seat(s), stem, yoke, packing, gland bolting, bushings, handwheel, and valve actuators are some of the major non-…

Selected Materials of Construction for Valves

Valve trim parts may be constructed of assorted materials because of the different properties needed to withstand different…

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…

Major Valve Parts

Pressure Retaining Parts Valve body, bonnet or cover, disc, and body-bonnet bolting are classified as pressure retaining parts…

Valves Covered by API Standards