YQ98004The filter piston type slow closing check valve is installed in the pipeline of high-rise building, fire water supply system and other water supply systems. Yq98004 filtering piston type slow closing check valve is installed in the water supply system of waterworks, high-rise buildings and other water supply systems, so as to prevent the backflow of medium and the occurrence of water hammer and water hammer. When the water pump is opened, the water enters into the middle chamber through the pipe, pushing the piston to rise, and the main valve is opened and closed. When the water pump stops working, the return water pressure of the piston drops. Because the flow rate of the needle valve at the inlet is smaller than that of the outlet ball valve, the piston drops slowly and the main valve closes slowly. One valve has electric valve, check valve and water hammer eliminator, which can effectively improve the safety and reliability of water supply system. Our company produces yq98004 filtering piston check valve, which is stable and reliable, and eliminates the pressure residual wave. Its characteristics: 1. Good effect of eliminating water hammer. The technical principle of slow opening and quick closing to eliminate water hammer is integrated to prevent water hammer from starting and stopping. 2. Easy to operate. Only need to operate the pump motor open and close button, the valve will automatically open and close in accordance with the pump operating procedures. 3. Good energy saving effect. The valve body adopts full channel streamline direct flow design, with small pressure loss, large flow rate, small volume and light weight.

Nominal pressure	Nominal diameter	Minimum operating pressure	Slow closing time	Applicable media	Applicable temperature	Applicable temperature	Test standard
1.0～2.5MPa	DN50～400mm	≥0.04 Mpa	3~60s（可调）	水、油	0～100℃	GB/T17241.6	GB/T13927

Part name	texture of material
Parts material	Cast iron, cast steel
valve seat	Tin bronze, stainless steel
Disc	Carbon steel, stainless steel+NBR
Stem	Aluminum green steel, chromium stainless steel
piston	Chromium stainless steel+NBR
filter screen	stainless steel
Spring	stainless steel