Double block and bleed valve

Double Block and Bleed Valves. It also cuts down the number of leak paths to the atmosphere, reducing the risk of hazards when transferring liquids dangerous to humans or the environment. There is a lot of misunderstanding surrounding the term double block -and- bleed (DBB) as used to describe valve functionality.

It seems almost every valve buyer and manufacturer has a different idea of what the term means for valve selection, which can result in the wrong specifications or valve type. It’s time to do maintenance on a section of process. The Dos and Don’ts of Isolating Pressure Relief.

Unique Operating Dynamics of Trunnion-Mounted. The Western Valve DAN-EX is an accepted Block and Bleed Valve (DBBV) as it has two independent seating slips that are mechanically expanded against the body seat by the downward movement of the tapered plug. It requires two in-line isolation valves and a bleed valve used to drain or vent trapped fluid between the two closure elements in order to safely isolate the downstream pipe. Designed for Severe Service, this valve can handle Class 15 30 and 6pressures.

The DBB eliminates the need for complicate costly multi- valve systems while still providing you with zero-leakage protection in harsh applications. INSTRUMENTATION DBB VALVES. This configuration provides the best technology for the most severe isolation services where double block and bleed is required. It can provide a seal against pressure from both valve ends when the valve is closed.

The basic operating feature of this valve is that it bleeds or vents the cavity between the seating surfaces.

Our double block and bleed valves has permitted gas, oil, and petrochemical operators to make sure fully safety in hard operations. We provide monoflanges, SBB and DBB valves in both needle and ball types. This valve is a space-saving dual isolation solution that reduces the need for costly multi- valve systems. By combining all block and bleed components into a single unit, DBB valves minimize the risk of leak paths to atmosphere while providing significant weight savings.

As per the API 6D specification for pipeline valves , block and bleed valve is a single valve with two seating surfaces. The engineered valve was designed as an improved version of the General Twin Seal Valve. SERIE TRI- BLOCK DOUBLE BLOCK AND BLEED.

By using this design, the former two valve system with a spool piece becomes obsolete. Two block valves and a bleed valve are installed as a unit, or manifol for positive isolation. Used for critical process service, double block and bleed valves are for ideal for high. Standard ball valves are furnished in 3SS with specials materials available.

What is double block and bleed ? The integrity of both valves shall be tested separately and the bleed valve will then be left in the closed position between periodic integrity checks. Franklin Valve - Houston, Texas. At YDB Valves , we engineer high quality double block and bleed valve customized to match process requirements.

But the conventional installation of DBB Valves is a time consuming process that can negatively impact the daily maintenance and operating work. It replaces older double block and bleed systems that use two valves with a spool and bleed valve in-between. Reduced space and no maintenance requirements are met.

Control Seal DBBV provides 1 bubble tight sealing both up and down stream and is achieved mechanically - independent on line pressure. Some of the standards have been listed below for ready reference : API-6D Specifications of Pipeline valves API-6FA Specification for Fire test for Valves. Same Day Shipping Available.

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