500X (A742X) type PN10 ~ PN25 pressure relief valve can hold water for more than the pilot valve will set the value of the safety pressure release, and to maintain the pressure in a pipe in the security settings below to prevent pressure or sudden pressure tube (SURGE) pipeline or equipment damage. High-rise building fire can be used to test the circulatory system of pressure relief to prevent the risk of causing the system pressure is too high. Holding pressure valve: the valve can be maintained upstream of the main water supply pressure at a set value or more, to protect the water supply area upstream of the main valve pressure. 

 】 【Performance parameters 
 Model A742X-10 A742X-16 A742X-25 
 Working pressure (MPa) 1.0 1.6 2.5 
 Temp (℃) 0 ~ 80 
 For medium water 
 Material body, cast iron valve cover 
 Chromium stainless steel stem 
 Valve seat, valve plate bronze 
 NBR diaphragm 

 Shape and size of the main connection 

 Nominal diameter DN (mm) Dimensions (mm) 
 L A1 A H1 H 
 20 150,130,333,463,557 
 25 160,130,333,463,557 
 32 180,130,333,463,557 
 40 200,140,343,516,610 
 50 203,140,343,516,610 
 65 216,140,355,520,625 
 80 241,145,360,537,642 
 100 292,155,400,596,750 
 125 330,165,420,653,808 
 150 356,180,435,709,864 
 2,004,952,054,808,051,135 
 2,506,222,255,308,551,185 
 3,006,982,455,759,531,325 
 3,507,872,756,209,901,385 
 4,009,142,856,681,030 1445 
 4,509,782,856,681,030 1445 
 5,009,784,107,807,501,110 
 6,001,230,456,888,850 1286