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What is difference between DBB and DIB ball valves?

DBB-Double Block and Bleed Seat Design: Single Piston Seats on both sides The seats can be forced to the ball by pressure from upstream and downstream, but when the body cavity pressure is higher than the piping pressure, the seats will be pushed away from the ball and release the body cavity pressure. But it also means that, in case one side seat fails to work, the pressure will push the seat on another side away from the ball and cause leakage. The seats are in single-direction sealing. (The moving...

Trim Numbers of Valves

For API valves, the trim is normally referred to the valve's internal parts that in contact with the fluid. According to API 600 and API 602, the trim is comprised of the following generally: a) stem; b) body seating surface; c) gate seating surface; d) bushing, or a deposited weld, for the backseat and stem hole guide; e) small internal parts that normally contact the service fluid, excluding the pin that is used to make a stem-to-gate connection (this pin shall be made of an austenitic stainless...

About Us

Founded in 2013, Bosseal Valve is a professional valve manufacturing company in Suzhou, China. We mainly supply Industrial Ball Valves, Gate Valves, Globe Valves, Check Valves, Butterfly Valves, Plug VaIves, and Strainers designed and manufactured according to API, ASME, ISO, DIN, BS, EN standards.