Summary
The
following important information in this chapter is summarized below.
Types
of Valves Summary
Gate
valves are generally used in systems where low flow resistance for a fully open
valve is desired and there is no need to throttle the flow.
Globe
valves are used in systems where good throttling characteristics and low seat
leakage are desired and a relatively high head loss in an open valve is acceptable.
Ball
valves allow quick, quarter turn on-off operation and have poor throttling characteristics.
Plug
valves are often used to direct flow between several different ports through use
of a single valve.
Diaphragm
valves and pinch valves are used in systems where it is desirable for the
entire operating mechanism to be completely isolated from the fluid.
Butterfly
valves provide significant advantages over other valve designs in weight,space,
and cost for large valve applications.
Check
valves automatically open to allow flow in one direction and seat to prevent flow
in the reverse direction.
A stop check valve is a combination of a lift check valve
and a globe valve and incorporates the characteristics of both
Safety/relief
valves are used to provide automatic overpressurization protection for a
system.
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