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Fakai Valve Factory Site: Yongxing Industrial Zone, Longwan District, Wenzhou City
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YQ98004 filter piston slow closing check valve

YQ98004 filter piston slow-closing check valve structure diagram
YQ98004 filter piston slow-closing check valve structure diagram

working principle

YQ98004 filter piston slow-closing check valve is installed on the pipes of high-rise buildings, fire water supply systems and other water supply systems. When the pump is turned on, water enters the middle cavity through the conduit, pushing the piston up and the main valve is opened and closed. When the pump stops working, the return pressure of the piston drops. Because the needle valve at the inlet has a lower flow than the outlet ball valve, the piston slowly drops and the main valve closes slowly. The valve is smooth and reliable and eliminates pressure residual waves.

Part material

Part Name Texture
Body and bonnet Cast iron, cast steel, stainless steel
Valve seat Tin bronze, stainless steel
Disc Carbon steel, stainless steel + nitrile rubber
Valve stem Aluminum blue steel, chrome stainless steel
piston Chrome stainless steel + nitrile rubber
Filter stainless steel
spring stainless steel

Installation diagram

YQ98004 filter piston slow closing check valve installation diagram

Dimension table

Nominal diameter
DN (mm)
L H G D D1 n-Φd
PN10 PN16 PN25 PN10 PN16 PN25 PN10 PN16 PN25
40 340 236 155 150 110 4-18
50 340 236 155 160 125 4-18
65 355 250 165 180 145 4-18 8-18
80 384 280 180 195 160 4-18 8-18 8-18
100 415 310 210 215 230 180 190 8-18 8-23
125 500 360 240 245 270 210 220 8-18 8-25
150 542 413 260 285 300 240 250 8-23 8-25
200 670 510 330 335 360 295 310 8-23 12-33 12-25
250 806 668 410 390 405 425 350 355 370 12-33 12-25 12-30
300 945 875 485 440 460 485 400 410 430 12-23 12-25 16-30
350 800 980 270 500 520 550 460 470 490 16-23 16-25 16-30
400 980 1050 300 565 580 620 515 525 550 16-25 16-30 16-34
450 980 1150 325 615 640 / 565 585 / 20-25 20-30 /
500 110 1250 345 670 705 / 620 650 / 20-25 20-34