DBB Ball Valve Double Block & Bleed, Double Ball, Flanged / Screw End

DBB Floating Ball Valve Double Ball Double Block & Bleed High Pressure

A double-block-and-bleed valve (DBB) 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.” This valve does not provide positive double isolation when only one side is under pressure.

A double-isolation-and-bleed valve (DIB) is 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.” This feature can be provided in one direction or in both directions.

Double block and bleed valves finish the work that would generally need 3 separate valves – one drain and 2 isolation valves. It costs less space, and decreases installation cost and permit fewer possible paths for leakage compared to traditional valve installation.

This configuration provides the best solution for the most severe isolation services where double block and bleed is required, and permits gas, oil, and petrochemical operators to make sure fully safety in hard operations. Some other benefits of installing double block and bleed valves are:

Reducing system vibration

Reducing bolting and gasket

Increasing system reliability

Applications where double block and bleed valves used include chemical seal isolation, gauge isolation, chemical instrument isolation, chemical injection connection, sample connection, direct mounting of instruments, instrumentation chain and remote mounting of instruments.

Features of Floating Ball Valves:
Double Block and Bleed
3-piece Body

Full Port
Fire Safe to API 607
Antistatic Design
Anti-blowout Stem

Lever, Gear Operation or Actuator Available

Optional Metal seated design

Optional Low emission packing according to ISO 15848

Applicable Standards of floating ball valves:
a) Design & Manufacture: API 6A/6D, BS 5351, ISO 17292, NACE MR-0175, ASME B16.34.

b) Fire-safe: API 607, API 6FA
c) Face to Face: API B16.10, API 6D, EN 558, DIN 3202
d) End Connection: ASME B16.5, EN 1092, JIS B2220, ASME B16.25
e) Test and Inspection: API 6D, EN 12266, API 598