As one of the leading silent check valves manufacturers and suppliers in China and equipped with a productive factory,Website: , Shanghai Hugo Valve Co.,Ltd is always at your service.Silent check valvesDescription1. Silent check valves is a valves which is used especially for eliminating water hammer, when the pump stopped, when the flow rate in a forwards direction of silent check valves is approach to zero, the silient check valves will close ahead of time by using the spring's auxiliary force to avoid the water hammer and eliminated the noise finally.2. Silent check valves can be installed horizontally or vertically .3. The disc of silent check valves used the spring loaded, which makes the valves' rapid closing to eliminate the water hammer, there is a good sealing performance, no closing noise.4. Silent check valves have the characteristics of small volume, light weight, small flow resistance, long long longevity. valves materials of constructionBody Materials: Cast Iron, Ductile IronSealing ring Materials: NBRSpring Materials: Inconel 750, stainless steelApplicable standard Size Range: 2''~24''(DN50~DN600)Pressure: PN10, PN16,Class 150, JIS 10KStandard : ANSI, DIN, JIS End Connection: flangeOperate: Automatic