Flowserve Valve, Actuation and Instrumentation Product Portfolio

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Flowserve offers a comprehensive range of quarter-turn, rotary, linear, control, and specialty configurations. Every valve manufactured is built with unwavering performance, long service life, and safe operation in mind. Flowserve also provides precision actuation and instrumentation for all applications, including remotely controlled, fully-automated electric, hydraulic, and pneumatic actuators, as well as electronic positioners and level switches. In most hazardous environments, fail-safe isolation, on-off modulation, and precision process control ensure efficient and reliable operation. Every intelligent flow control solution provides industry-leading performance and reliability, with embedded technologies that make them simple to use and maintain. You'll get end-to-end intelligence that maximizes your uptime by combining our control solutions with real-time system analysis, predictive maintenance, and remote service capabilities.

Trunion Mount Ball Valves in Double Block and Bleed Assembly

Double block and bleed valve assembly
Valbart - Flowserve

The nature of some processes, as well as applicable industry standards, can call for a specific valve arrangement that provides isolation of a piping section with a safety factor not inherent in a standard stop valve.

Combined into a single compact unit, a double block and bleed valve consists of two trunnion mounted ball valves and a third smaller valve. While it is possible to employ other valve types in place of the ball valves, the trunnion mounted ball valve is well suited for the heavy duty applications involved in the oil and gas industry.

Each of the ball valves serve to block the process flow and the third valve serves as the bleed or drain valve for the space between the two block valves. Combining both ball valves into a single unit reduces leakage paths, weight, and installation complexity.

In addition to serving as a positive isolation valve set, a double block and bleed is also applied in meter calibration. Calibration of the meters used for custody transfer must be accomplished with a confirmed zero flow rate. Any valve leakage has the potential to impart an offset of the zero value on the meter, resulting in continuously incorrect readings. Closing off the flow with a double block and bleed valve, draining the inter-valve space with the bleed valve, then monitoring the bleed port for any continued flow can confirm zero flow in the metered line.

Share your process piping and fluid control challenges with an application specialist, combining your process knowledge with their product application expertise for the most effective solutions.

Trunnion Mount Ball Valve Double Block and Bleed Assembly from CTi Controltech