Zwick – Tri-Block Double Block & Bleed ValvesEnquire Now

Zwick 8211 TriBlock Double Block 038 Bleed ValvesZwick 8211 TriBlock Double Block 038 Bleed Valves

BRAND: ZwickCATEGORY: DBB Double Block & Bleed, Triple Offset Valves,

The Zwick Tri-Block Double Block and Bleed (DBB) valve has all the design features and technical advantages of the Tri-Con triple offset valve plus there is a true double block and bleed feature which delivers zero leakage. By using this design, the former two valve system with a spool piece becomes obsolete.

This fact is not only important for installation since you have to install only one valve body in the pipeline, but also only one actuator or gearbox is required. With Zwick’s unique design of the linkage between the two shafts, you are able to actuate both shafts with only one actuator and reach zero leakage with the two available sealing surfaces. The design of the linkage forgives any dimensional changes due to thermal differences in the valve. The redundant zero leakage performance of this valve is the ideal valve solutions for several critical processes where absolute zero leakage and pipe inspection via the bleed port are required.

Applications like multi-product manifolds, meter stations, tank storage isolation or hydrant isolation are very sensitive to leakage and the Zwick Tri-Block Double Block and Bleed Valve would be the ideal solution.

Our Valve Repair Centres in Secunda and Durban provide a full valve repair and reconditioning service as well as valve automation to assemble and test your valve packages.

Contact one of our technical specialists for a quote today or download the brochure to learn more!



Double Block & Bleed (DBB)

  • Bi-directional -Zero leakage
  • Non Rubbing – Self Centering Disc
  • Metal to metal seats
  • Inherently fire safe & tested
  • Thermal expansion compensation

80mm to 600mm / 3” to 24”


ANSI 150 – 300

Temperatures-196°C to +815°C
Double flanged – DBB face to face ANSI B16.10

Carbon steel / Stainless Steel / Alloy steels / Special alloys

Resilient metal to metal
Options &
  • Gearbox
  • Electric actuator

Where you are looking for a double block and bleed valve that offers zero leakage for tank farms storage isolation, multi-product manifolds or meter stations.


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