Which valves are installed in a directional manner?
Depends on the specific valve is one-way seal or two-way seal?
Very simple answer to your valve, in addition to gate valve and butterfly valve (single line up, first closed), such valves are not directional, and other have
Regulating valve, stop valve, eccentric butterfly valve, check valve, one-way valve, solenoid valve, pressure reducing valve, drain valve and drain valve. Needle core valve, V ball valve, part of the ball valve, there is flow.Few. Such as floating ball valve, the central butterfly valve does not flow requirements. In general, if the regular manufacturers of valves, flow direction will indicate the flow of medium, to get the valve can see.
There are balance valve, safety valve, pressure relief valve
