The arrow direction marked on the valve body indicates the pressure bearing direction of the valve, which is generally used as the medium flow direction symbol by the engineering device company. The leakage of the wrong device and even pipeline accidents are caused.
The pressure bearing direction refers to the closed state after the valve is applied to the pipeline working condition, and the arrow direction of the valve body is the direction of introducing and receiving pressure. If the device is at fault, the leakage problem of loose valve sealing may occur.
Soft seal ball valves are generally two-way sealed, and the arrow is generally not marked. The metal hard seal ball valve can achieve two-way sealing, but there will still be one direction, and the sealing function is still better. Therefore, the arrow will also be marked, which refers to the pressure bearing direction of the valve. You can consult the customer first.
For the hard seal butterfly valve with marked arrow, the arrow direction and medium flow direction are different in different directions of the pipeline.
For example, at the outlet end of the water pump in the pump room, the arrow of the valve body is opposite to the flow direction of the medium. For example, at the inlet end of the water pump, the arrow and the flow direction of the medium are common. If it is installed on the main pipe Road, the arrow generally conforms to the flow direction of the medium, which depends on the working condition and device orientation.
