single block and bleed valve

Update Date:2016-06-03     Pageviews:1157


Single block and bleed valve


Single block and bleed valves are used to achieve positive isolation when performing maintenance activities in a live process plant. Typically one block valve and a bleed valve are manufactured as a single assembly and this single block and bleed valve manifold can be readily installed for isolation purpose.

Single block and bleed valves are usually used for non-critical process service, such as low pressure system or non toxic, non hydrocarbon, non-hazardous process fluids. For critical service, double block and bleed valve assemblies must be used.

To perform positive isolation while performing maintenance, repair or shutdown activities, single block and bleed can be used in the following way. The block valve is closed first. The shutdown side of the block and bleed assembly is then drained vented/purged to make ready for maintenance.

Block and bleed valves are also often used with spectacle blind or blind spacers to provide positive isolation. Block and bleed valve assemblies allow fewer potential leakage paths compared to traditional separate installations of individual valves, thus increasing safety of the design.


Single block and bleed valve in stainless steel with options of packing for high temperature applications in flange to flange. These valves feature 1 ball valve for isolation and a needle valve with hardened tip to bleed. Available in 1/2" to 2", class 150# to 2500#. 100% of valves are factory tested. Available in 316 stainless steel, carbon steel, duplex and super duplex. Single Isolation & Bleed.

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