Block and bleed valves are hydraulic manifold systems that offer an individual component interface by combining several valves, specially ball and needle valves. DBB and DIB valves are used in applications in which critical isolation is needed to make sure that leakage doesn’t happen. Within trunnion-mounted ball valve with self-relieving seats (which API 6D defines as a dual block and bleed) there is stress on the upstream seal, but no strain on the downstream part, therefore the only thing energizing the seal on that part is a spring.
Usually the locking means is a band that will be formed of a material which preferably has a greater level of resilience versus human anatomy seal to be able to enable compression of locking means ahead of the human anatomy seal and therefore become a way to absorb vibrationery or other forces regarding the retainers from causing the same to maneuver place within the valve.
Manufacturer of valves including two-way, three-way, cartridge, flow, atmosphere, aluminum, back pressure, blow-off, metal, bypass, cartridge, coaxial, cryogenic, cylinder, direct acting, electrically operated, movement KP-LOK double block and bleed valve control, explosion evidence, pilot, pneumatic, stem, security, vapor, vent, gas, oil, & stress control.
The valve shown is recognized as a dual block and vent (bleed) valve and comprises two ball valve assembly modules 10, 12 and a vent construction 14. The vent installation is linked to the passage 4 via slot 5 and is positioned intermediate the balls for the ball valve set up modules 10, 12 allowing the controlled venting of fluid from passage 4 and therefore the pipeline.
ATV supplies toward overseas industry the full selection of valves and actuators that may run at great ocean depths (deep and ultra-deep waters, up to 3.000 m) with working force around 20000 psi. It must have a bleeder in the middle (between the two valves and between each valve’s seals if Type C valves are used).
Drifting or trunnion mounted ball valves in main bore, each valve is bi-directional and created for complete differential pressure at ambient and low temperature. This particular feature makes them indispensable when any work will be completed downstream of those types of isolation valves. It needs stress on upstream and downstream sides simultaneously to energize the particular seals.
Introducing the J Flow Controls group of Double Block & Bleed valves, which stop process fluid from stepping into areas in which work will be done. When the procedure fluid feeds the downstream equipment, the valves are setup to truly have the isolation valves remain open therefore the bleed valve shut. ATV stresses its willingness to make engineered valves; consequently, it welcomes requests for special size, class and design demands.