http://www.ruimaivalve.com/metal-valves/gate-valves/ Description The gate of F4 Non-Rising Stem Resilient Gate Valve is made of EPDM or NBR coating, and the valve body is made of epoxy resin coating. The distinguishing feature of this gate valve is that it has an unobstructed passageway, which minimizes the pressure loss of the valve. The product adopts a straight-through flow channel design, and the gate is all covered with high-performance rubber, so the sealing is reliable, and the operation is easy. It is mainly used in domestic water system, water supply and drainage system, sewage treatment system, etc., or used as a cut-off device on fluid transmission pipelines in construction, urban environmental protection, petrochemical, electric power and other industries. website:http://www.ruimaivalve.com/metal-valves/gate-valves/