Trunnion Ball Valve Double Block Bleed
Trunnion ball valve double block and bleed can isolate piping on both sides of the valve (uni-directionally) to vent/bleed the valve cavity between the seats.
Key Specifications / Features
API 6D defines a double block and bleed valve as a “single valve with two seating surfaces that, in the closed position, provides a seal against pressure from both ends of the valve with a means of vending/bleeding the cavity between the seating surfaces.
This trunnion style ball valve from Relia Valve provides double block and bleed in a single valve. This style can isolate piping on both sides of the valve (uni-directionally) to vent/bleed the valve cavity between the seats.
Application of Double block and bleed valve
Double block and bleed valves are most commonly used in the oil and gas industry, but can also be helpful in many other industries.
It’s typically used where bleeding the valve cavity is required, where piping needs isolation for maintenance, or for any of these other scenarios:
Prevent product contamination
Remove equipment from service for cleaning or repair
Liquid service near waterways or municipalities
Transmission and storage
Chemical injection and sampling
Isolate instrumentation such as pressure indicators and lever gauges
Primary process steam