Shoulong Valve
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Two independent ball valves with a central bleed cavity provide positive upstream and downstream isolation with safe pressure release and verification.
Trunnion-mounted structure reduces operating torque and ensures stable sealing performance under high pressure conditions.
Flanged inlet combined with high-pressure threaded outlet enables compact and flexible installation in complex pipeline layouts.
Reduced bore design is ideal for sampling points, injection lines, and instrumentation branches without compromising isolation safety.
Independent stem bases with locking devices prevent accidental or unauthorized operation in hazardous environments.
Forged body materials with Class 2500 pressure rating ensure long-term reliability in Oil & Gas, offshore, and high-pressure chemical services.
QWhat is the function of the double block and bleed valve in a pipeline system?
A double block and bleed valve provides two independent sealing points (block valves) and a central bleed cavity between them. This allows operators to safely isolate a section of pipeline and release any trapped pressure in the cavity, verifying that both seats are properly sealed before maintenance or inspection work begins.
QWhy is a trunnion-mounted ball valve preferred over a floating ball valve under high pressure?
In a trunnion-mounted design, the ball is mechanically anchored at the top and bottom by trunnion bearings, which absorb pipeline pressure loads. This significantly reduces the operating torque required to open or close the valve and maintains consistent sealing performance even at very high pressures.
QWhat are the advantages of an asymmetric flanged & threaded valve configuration?
The asymmetric configuration featuring a flanged inlet and a threaded outlet offers greater installation flexibility in space-restricted or complex pipeline environments. The flanged end provides a robust connection for the main line, while the threaded end allows for compact, direct connection to instruments or branch piping.
QIn what applications is this double block and bleed ball valve most commonly used?
This type of valve is widely used in oil and gas production, offshore platforms, petrochemical plants, and high-pressure chemical processing systems. It is particularly suited for sampling points, chemical injection lines, instrument root connections, and where safe positive isolation with pressure verification is required.
QWhat is the significance of Class 2500 pressure rating in forged steel valves?
Class 2500 is one of the highest standard pressure-temperature ratings, indicating the valve can withstand extremely high pressures and temperatures. Combined with a forged steel body, this rating ensures reliable, long-term performance in the most severe service conditions compared to cast materials.
QHow do lockable stems improve operational safety in hazardous environments?
Lockable stems allow the valve position to be physically locked in either the open or closed state. This prevents accidental actuation, unauthorized tampering, or unintended valve operation during maintenance or emergency procedures, which is critical for process safety management.
