A gate valve, also known as a sluice valve, is a valve that opens by lifting a barrier (gate) out of the path of the fluid.” The main function of a gate valve is to cut off the medium. Dervos has been supplying gate valves for more than 10 years, from API 600 wedge gate valve, API 6D through conduit gate valve, API 6A wellhead gate valve to knife gate valve, pressure seal gate valve, bellow seal gate valve, expanding gate valve, carbon steel gate valve, stainless steel gate valve to cast iron gate valve and etc