According to this method of specifying, Check Valves and pre-fill valves would be 2-way valves because they have two ports. However, because these valves are basically single function and have infinitely variable flow paths, their symbols and terminology do not follow general directional control valve rules. Notice the symbol has two boxes (or envelopes) to indicate two positions. Each position is a flow path. The box with flow lines coming to it is the normal or at-rest position of the  Valve.

More products of valves

Gate Valves

Butterfly Valves

Globe Valves

Safety valves

Plug Valves

2012-06-28

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