Double Block and Bleed Ball Valve

Double Block and Bleed Ball Valve

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DBB Ball Valves

Product Description

DBB ball valve (Double Block and Bleed Ball Valve) stem adopts the inverted seal structure with sealing gasket set in the lower type, the sealing force of inverted seal increases with the increase of medium pressure in the valve cavity, so as to ensure the sealing effect of the stem. When the valve cavity is abnormally pressurized, the stem will not be flushed out. The packing adopts a reasonably designed V-shaped structure, which can effectively convert the medium pressure inside the valve cavity and the locking force of the external gland into the sealing force of the valve stem.

Structural features

Fire-resistant structure: according to the needs of users, the ball valve can be designed into a fire-resistant structure, in the unlikely event of a fire that burns the seal, each sealing part of the ball valve can form a metal-to-metal hard seal structure, effectively stopping the spread of the medium and preventing the expansion of the fire.

With lock structure: for the installation in the field or to prevent non-staff misoperation, as well as in some vibration occasions handle impact prone to misoperation of the valve, there is no locking hole in the fully open or fully closed position of the valve, when needed, a lock can be added to play a safety insurance role.

Anti-static structure: The ball valve can be designed with an anti-static structure, that is, a conductive spring is set between the ball and stem, stem and body, so that the static electricity generated during the opening of the valve can be introduced into the ground through the static electricity channel set into the pipeline to achieve the purpose of removing static electricity. Avoid electrostatic ignition ignition flammable media to ensure the safety of the system.

product application

Double Block and Bleed Ball Valve is designed to replace the complex form of multiple valve connections in traditional piping. Reduce the leakage point in the system, quickly achieve the discharge, closing function. Double blockage double discharge ball valve saves installation space to the maximum. Simplifies installation procedures. Reduces pressure in the piping system. Facilitates instrument cleaning and maintenance, reducing costs. There are two series of full bore and reduced bore. The channel inside diameter of full diameter ball valve is the same as the inside diameter of the pipeline, not only the fluid resistance is small, but also easy to clean the pipeline. The fluid resistance of the reduced diameter ball valve is much lower than the fluid resistance of the same diameter globe valve, and the weight is about 30 lighter than the same diameter ball valve, which effectively reduces the production cost and price, and thus has been more widely used.