What is double block and bleed ball valve

In meter block service, the differential pressure across each closed valve is very low. No assistance is required from the line pressure to energize or compress floating seals to make them hold tight. The seals typically rely on springs to press them against the ball unless the body cavity in a ball valve is vented.

In meter block service, the differential pressure across each closed valve is very low. No assistance is required from the line pressure to energize or compress floating seals to make them hold tight. The seals typically rely on springs to press them against the ball unless the body cavity in a ball valve is vented.

Double Block and Bleed Valve is a side-entry ball valve, with either a bolted or welded body, designed for use in upstream, midstream and downstream oil and gas applications. 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. This feature can be achieved with one single valves complete with a bleed port between the obturators.

The Double Isolation And Bleed Valve is known to replace the existing conventionally used methods, which were employed by pipeline engineers. Typically a Double Block And Bleed Gate Valve is used as a unit or manifold. Hence, the Double Block Bleed Valve is to be installed for positive isolation. Used for critical process service, Double Block And Bleed Plug Valve are designed for high pressure systems or the  Double Block And Bleed Ball Valve can be used for toxic or hazardous fluid processes.