Silent Check Valve 

 One. Product Features and Uses 

 Silent Check Valve mainly by the body, seat, diversion body, valve, bearing and spring, is the main component parts, the internal flow with streamline design, minimal pressure loss. 
 Valve open and close a short trip, stop the pump quickly shut down to prevent water hammer huge sound, with mute off characteristics. 
 This valve is mainly used for water supply and drainage, fire, HVAC system, installed at the pump outlet to prevent water hammer back and damage the pump. 

 II. Main technical parameters 

 Model 
 DRVZ-10 
 DRVZ-16 
 DRVZ-25Q 

 Nominal 
 PN1.0MPa 
 PN1.6MPa 
 PN2.5MPa 

 DN 
 DN50-250mm 

 Maximum working pressure 
 1.0MPa 
 1.6MPa 
 2.5MPa 

 Sealing test pressure 
 1.0MPa 
 1.6MPa 
 2.5MPa 

 Shell Test Pressure 
 1.5MPa 
 2.4MPa 
 3.75MPa 

 Main 
 Parts 
 Materials 
 Valve, diversion body 
 Gray cast 
 Ductile iron 

 Seat, bearings, valve, shaft 
 Chrome aluminum bronze or stainless steel 

 Spring 
 Stainless Steel 





 III. The main dimensions (flange dimensions PN1.0MPa by GB4216.4-84 standard, PN1.6MPa by GB4216.5-84 standard, PN2.5MPa according to GB91134-88 standard) 

 Nominal diameter DN (mm) 
 L 

 50 
 120 

 65 
 150 

 80 
 180 

 100 
 240 

 125 
 300 

 150 
 350 

 200 
 450 

 250 
 500