Profile: Hebei Huahui Valve Co., Ltd specializes in designing and manufacturing various kinds of valves and accessories, such as gate valves, butterfly valves, check valves, hydraulic control valves. Our hydraulic valves include float valves, pressure reducing valves, pressure relief valves, and flow control valves. DIN3352-F4 NRS iron gland type resilient seat gate valve features ductile iron core which is fully vulcanized with EPDM rubber, no iron parts are exposed to the medium. The rubber vulcanization prevents creeping corrosion underneath the rubber.