Double Block and Bleed Gate Valve

A Double Block and Bleed gate valve (DBB gate valve) is a multi-turn linear isolation assembly engineered with two independent seating surfaces (or a dual-wedge/slab configuration) and a central body cavity drain valve, providing double positive isolation and inline seal verification within a single valve body. By closing the main gate and opening the central bleed valve, operators can vent trapped cavity fluid to confirm absolute zero-leakage shut-off from both directions before performing downstream maintenance. Conforming to standards like API 6D, API 600, and ASME B16.34, these critical safety valves are primary specifications in high-pressure oil and gas pipelines, refinery manifold isolation, and toxic fluid transfer lines, allowing safety directors to guarantee worker safety and environmental protection by importing certified Double Block and Bleed gate valves directly from premier manufacturers in China via our advanced B2B commercial platform.