Floating Ball Valve

BLOW-OUT PROOF STEM

The stem is downloading with its inverted sealing structure with sealing gasket, the force of inverted sealing structure will increase while the medium pressure in the valve cavity increases to ensure the sealing effect of the stem, in case of abnormal pressure in creasing of the valve cavity, the stem won’t be impacted out. The filler is designed with proper V shaped structure which can effectively convert the medium pressure inside the valve cavity and the locking force of outer gland into the sealing force of stem.

FIRE SAFE SEAT SEALING

According to the user’s requirement, the ball valve can be designed with fire-resistant structure, in case of a fire and the sealing ring is damaged, every sealing part of the ball valve can form the structure of metal-to-metal hard seal, witch can prevent the spreading of both the media and fire.

• During the fire, soft seat (such as TFM1600, PTFE, PTFE and etc) will burn up and lose supporting and sealing functions, then the ball moves free downstream due to pressure from upstream, and contacts secondary metal seats of body or end cap, which comes to a leakage prevention (see figures #1 & #2).
• Grafoil body gaskets can endure high temperature and remain unaffected during the fire, and eventually prevent fluid leakage to the exterior. Moreover, the connection of body and end cap flange maintains metal to metal contact by stud bolts screwed into body (see figures #3 & #4).
• Grafoil packing can endure high temperature and remain unaffected during the fire and prevent fluid leakage to the exterior (see figures #5 & $6).
  

STATIC-PROTECTING CONSTRUCTION

The floating ball valve could be designed as static -protecting construction as required, namely, mounting conductive spring between the body and stem, or between the stem and body, there after the static engendered during opening the valve could be conducted to pipelines then earth through the preset static passage to clear static away, the design works to prevent igniting combustible medium by static fire-striking for the system safety.

 

INTERLOCKING DEVICE

For floating ball valve is installed outdoors, preventing non-workers and improper operation of the valves, which collision of its stem in relatively violent vibration occasions easily causes improper operation, a locking bore can be set in the full open position or fully closed position and lock can be used if needed for the purpose of security insurance.