DBB Valve Basic Character:
DBB valve (Double Block and Bleed Valves) assure double isolation function thanks to two obturator inserted in a single body. It provide the bleed function by means of a bleed/vent system, which located between obturators(body port and ball, gate or needle valve). DBB valves have several different constructions.
Double fixed balls hinged on supports, and floating metal or soft seats, central needle vent valve
Size Range from 1/2”through2”, large sizes on request
Pressure Range: from ASME Class 150 to ASME Class 2500
Temperature Range: from -46 to 450
Side Entry Forged Steel Valves
On request, Top-Entry design
Low pressure loss through the valve
Low actuation torque
“CE” marking in compliance with PED Directive 97/23/EC
Full bore or Reduce bore
Different kinds of ends connections(RF/RTJ) Flanges, Butt weld, Clamp Connection, Socket Welding.
Wide availability of materials sepending on the specifications(carbon steel, stainless steel or Duplex steel for service in corrosive environments, Chrome-Molybdenum alloy steel for high temperature service, etc.
Materials with anti-corrosion properties according to NACE MR 0175
On request, seat pocket area overlay, seal area overylay, or completed cladding on wetted surface(welded overlays in inconel 625, Stainless Steel 316 etc., or Electroless Nickel Plating)
Suitable for wrench or motorized actuation(hydraulic, pneumatic, gas-over-oil or electric actuator)