This check valve protects the pump by bypassing the discharge pressure that instantaneously rises when the pump starts. It also absorbs shock by linearly opening the water hammer cushion valve to prevent a water hammer resulting from a surge in pressure by the backward flow of water inside a standing pipeline when the pump stops. In addition, this product has a port soft sealing structure, thereby ensuring perfect air tightness at normal times.

• Outlet-side water pressure < Spring force
• he auxiliary valve opens
• Water from the main valve passes through points D, E, and F, and flows in the direction of point G
• Water at A, the upper part of the main valve diaphragm, flows in the direction of point D(If only a small amount of water is used or is not used at all on the inlet side)
• Volume of water that was filled up at A goes down