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 over pressurization protection for a system.
