Product Name: YQ98004 slow closing check valve type filter 
 Category: 9800 filter control valve piston 
 Specifications: YQ98004 type 
 Product Diameter: DN40-400mm 
 Product pressure: 1.0-2.5MPa 
 Views: 324 
 Input time: 2008-10-25 
 Page Keywords: YQ98004 slow closing check valve type filter 
 I. Overview 
 YQ98004 piston check valve installed in the filter high-rise building, fire water systems and other water supply system pipe. When the pump is turned on, water through the tube into the chamber, push the piston up, the main valve switch. When the pump stops working, the piston in the return water pressure drops, the inlet valve needle valve flow rates than exports, so slow down the piston, main valve also will slowly close. Our company produces YQ98004 smooth and reliable filter piston check valve to eliminate the aftermath of the pressure. Material of main parts as follows: 

 Part Name Material 
 Body, bonnet cast iron, cast steel, stainless steel 
 Bronze seat, stainless steel 
 Valve carbon steel, stainless steel + nitrile rubber 
 Qinggang aluminum stem, chrome stainless steel 
 Chromium stainless steel + nitrile rubber piston 
 Stainless steel filter 
 Stainless steel spring