“N” Type Double Block and Bleed
N Type Forged DBB
Machined from a single piece upset forging, our “N” Type Double Block and Bleed Valves feature two-needle primary and secondary isolating valves and a needle valve. With a range of different operating temperatures and configurations, our Double Block and Bleed Valves are the superior market leader.
Oliver Valves Double Block and Bleed valves provide Metal seating, with a 5.4mm bore for many applications without having to resort to traditional single isolate valves.
Oliver Valves’ standard “N” Type DBB range from 150lb up to 2500lb, but can also be rated to 10,000psi.
The N-type forged DBB valve is available in Stainless Steel, Carbon Steel, Duplex, Super Duplex and many other materials on request. We have various connection types and sizes are available, from Flanged, Hub, Threaded, to Welded. The standard temperature range up to 540 Deg C, depending on materials. All NPT connection threads are Single Point CNC machined.
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.
A smaller unit vs the traditional hook-up, bringing both piping and instrumentation isolation into one unit. Which indicated less weight, which is significant on the top side of a platform when you combine all the pressure instrument take-offs. The benefit means 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. But this is generally overcome by adding more stanchions to support traditional installation, which adds even more weight.
Cost reduction is a significant benefit, typically saving over 30% when compared to traditional installation, which jumps up to 70% in the case of valves made from exotic materials for more exacting processes!
The cost of one factory tested component, as opposed to different piping valves, instrument valves, flanges, connections and flanged seal rings, is considerably lower. But there is also the cost of raising purchase orders and expediting the department to chase the parts in goods receivable, etc. Then the shipping costs are larger and weightier; specs must all be considered; rises in cost can be 30% of the overall cost.
