Shoulong Valve
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Two independent balls provide positive dual isolation, replacing traditional two-valve assemblies in one compact body.
Allows pressure monitoring and safe cavity discharge to confirm seal integrity during operation.
Designed for high pressure service with fire-safe, anti-static, and blowout-proof safety protection.
ISO 5211 interface with flexible materials, pressure ratings, and sizes for critical oil & gas applications.
A Double Block and Bleed valve uses two independently seating balls to isolate the process line from both upstream and downstream directions simultaneously. A cavity vent between the two balls allows trapped pressure or fluid to be safely discharged, enabling positive confirmation of seal integrity without removing the valve from the line.
The integrated cavity vent allows operators to monitor inter-cavity pressure in real time and safely bleed off any trapped fluid or gas. This enables online seal verification — confirming that both seals are holding properly — without shutting down the system, greatly reducing safety risks and unplanned downtime.
Forged trunnion construction anchors the ball via fixed trunnion supports, reducing the load on the seat seals under high pressure conditions. This design delivers higher pressure ratings, longer seal life, lower operating torque, and enhanced safety features including fire-safe, anti-static, and blowout-proof stem protection — making it ideal for critical pipeline and process applications.
ISO 5211 is an international standard that defines the mounting interface between a valve and its actuator. Compliance ensures that the valve can be directly fitted with pneumatic, hydraulic, or electric actuators from any compatible manufacturer without the need for custom adapters, simplifying automation, reducing installation costs, and improving interchangeability in complex systems.
Yes. These valves are fully project-customizable across a wide range of parameters including body materials (carbon steel, stainless steel, duplex, etc.), seat materials (PTFE, metal-seated), pressure classes (ANSI 150 to 2500), end connections (flanged, butt-weld, threaded), and size ranges. This flexibility makes them suitable for demanding oil & gas, petrochemical, and offshore applications.
Double Block and Bleed valves are widely used in upstream, midstream, and downstream oil & gas operations, as well as in petrochemical plants, refineries, LNG facilities, power generation, and offshore platforms. They are the preferred solution wherever positive isolation is required for metering, instrumentation connections, pig trap closures, or equipment maintenance isolation.
