What Does the Valve Arrow Mean on the Valve Body?
The arrow marked on the valve body is the recommended pressure bearing direction of the valve, not the flow direction of the pipeline medium. Valves with two-way sealing function may not be marked with an indicating arrow. Sometimes they may be marked with an arrow, because this
valve arrow refers to the recommended pressure bearing direction, as one of the left and right or up and down directions is always better.
The
arrow direction marked on the valve body indicates the pressure bearing direction of the valve, which is usually incorrectly marked as the medium flow direction that leads to false installation by engineers, causing leakage and even pipeline accidents.
The pressure bearing direction refers to the recommended
arrow direction mark of the valve body in the closed state after the valve is applied to the pipeline working condition. If the valve is installed incorrectly, the leakage fault of the valve may occur. Supersoft sealing ball valves are usually sealed in two directions, and no arrows are usually marked. Metal hard sealing
ball valves can be sealed in two directions, but the sealing performance in one direction is still better, so arrows are also marked, which refers to the recommended pressure bearing direction of the valve. You can also consult the customer at first.
Hard seal
butterfly valve with marked arrow is in different positions of pipeline, and its direction and medium flow direction are different. For example, at the outlet end of pump in pump house, the arrow of valve body and medium flow direction are opposite. For example, at the inlet end of pump, the arrow and medium flow direction are consistent; if installed on main pipeline, the arrow direction generally conforms to medium flow direction, which depends on working conditions and installation position.