Pneumatic control valve—does a butterfly valve have a direction?
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Pneumatic control valve —— Should butterfly valves be installed according to the pressure direction? Should we still consider using a gauge device to determine the direction?
Install in accordance with the flow direction of the medium and the direction indicated on the valve body
Reply to 2# Pirlo1: There is no direction indicator on the valve body; only a pressure indication is available
Which type of butterfly valve? Centerline butterfly valves do not require a specific orientation; soft-sealed versions generally also do not need a specific orientation
Reply to 3# That smile: Yours is a check valve, which has a direction. One of the sealing surfaces is stepped in shape; this is the pressure-bearing surface, and it is installed facing the direction from which the medium comes. Once the valve is closed, the force exerted by the medium causes the valve to close more tightly, thereby achieving excellent sealing performance
Butterfly valves with centerline sealing are direction-independent, while eccentric butterfly valves and triple-eccentric butterfly valves require a specific orientation
Ordinary butterfly valves don’t have a direction aspect; it’s either a hard seal or an eccentric design
Reply to 5# Valve Mingming: The main consideration is that it is an instrument-controlled valve; the question is whether the instrumentation has requirements regarding the flow direction of the valve
Reply to 8# That Smile: It doesn’t matter what method is used to control it; just install it in the usual way
Eccentric valves have a direction, while the center line has no direction
Generally, there is a direction indicated, with arrows on the valve body.