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concept of DBB valve(double block and bleed valves
Datetime: 2016-06-28    Visit: 325
KP-LOK manufactures a unique range of Double Block and Bleed Valves (DBB valve) and Double Block and Isolation Valves. The main definition for Double Block and Bleed valves comes from API, where a Double Block and Bleed valve is "a single valve with two seating surfaces that, in the closed position, provides a seal against pressure from both ends of the valve, with a means of venting/bleeding the cavity between the seating surfaces." DBBs can therefore come in different shapes and forms, since APIs definition is a functional rather a design definition. Double Isolation and Bleed (DIB) valves, on the other hand is defined by API to be a "single valve with two seating surfaces, each of which, in the closed position, provides a seal against pressure from a single source, with a means of venting/bleeding the cavity between the seating surfaces." So the DBB blocks pressure from both ends whereas the DIB offers the enhanced performance of sealing against pressure that comes from one end only.

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KP-LOK,a world class manufacturer that can supply extensive product range includes needle,gauge,ball,manifold,monoflange,double block and bleed valves,our well-trained staff can respond to your needs quickly and competently, with technical application advice if requested. KP-LOK can satisfy the various demands of Oil & Gas, Offshore, Petrochemical, Power, Paper, Cement, Food, Building, Marine, Water Works and Industrial markets.
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