D Type Forged DBB

Machined from a single piece upset forging, our ‘D’ Type Double Block and Bleed Valves feature two inline ball pattern primary and secondary isolating valves and a heavy-duty needle vent valve. With a range of different operating temperatures and configurations, our Double Block and Bleed Valves are a superior market leader.

Oliver Valves Double Block and Bleed valves provide Soft or Metal seating, with 10mm, 14mm, or 20mm bore isolation valves; they can be used in many applications without resorting to traditional single isolate ball valves.

The needle valve is supplied as standard with a non-rotating tip to allow linear closure while eliminating galling. Oliver Valves’ standard ‘D’ Type DBB range from 150lb up to 2500lb but can also be rated to 10,000psi. They are available in Stainless Steel, Carbon Steel, Duplex, Super Duplex and many other materials on request.

Various other connection types and sizes are available, for example, flanged, Hub, Threaded, Welded. Standard Temperature range up to 240 Deg C ‘“ Soft Seated and 350 Deg C ‘“ Metal Seated. All NPT connection threads are Single Point CNC machined.

A smaller unit vs the traditional hook-up, bringing both piping and instrumentation isolation into one unit. This means there is less weight, which is significant on the top side of a platform when you combine all the pressure instrument take-offs. Typical installation is reduced from 33kg to 7kg, a weight reduction of 75%.

Weight reduction is also an issue when take-off is horizontal; this instils a bending moment and could cause critical fracture of the pipeline-interface. This is generally overcome by adding more stanchions to support traditional installation, which adds even more weight.

Cost reduction is another benefit, as typically 30% is saved over traditional installation, which jumps up to 70% in the case of valves made from exotic materials for more exacting processes!

Cost-saving on site ‘“ the cost of one factory tested component, as opposed to different piping valves, instrument valves, flanges, connections and flanged seal rings and then the cost to raise purchase orders and expediting department to chase the parts in goods receivable, etc. This, in turn, causes the shipping costs to be larger and weightier and specs must all be taken into account; price rises can be 30% of the overall cost.

All Oliver products have material traceability and pressure test certificates to BS EN 10204 3.1. A unique code is stamped on all valve bodies linking them to their material and chemical analysis certificates.