Principle of the cast steel floating ball valve: This kind of ball valve has a floating ball supported by two valve seats. Under the medium pressure effect, a certain displacement can be generated by the ball itself so as to be pressed onto the seat seal ring at the outlet, guaranteeing tightness at the outlet.

The floating ball valve is mainly divided into such two structures as the single-body type and double-body type float ball valve structures

Principle of the forged steel floating ball valve: This kind of ball valve has a floating ball supported by two valve seats. Under the medium pressure effect, a certain displacement can be generated by the ball itself so as to be pressed onto the seat seal ring at the outlet, guaranteeing tightness at the outlet.

The floating ball valve is mainly divided into such two structures as the two piece body type and three piece body type float ball valve structures

The side entry trunnion mounted ball valve has been designed two piece body type or three piece body type and with two floating seats, which are movable under the pressure of medium. Under the bottom of seats, seat pre-loading springs are positioned to ensure two floating seats can attach the ball’s surface tightly, other more, pressure of medium also can push seats to attach ball tightly to ensure sealing more reliable.

The trunnion ball valve is equipped with a movable seat seal ring which can generate displacement under the pressure of medium. In case that any medium pressure exists, the pressure will press the valve seat seal ring onto the ball tightly, guaranteeing the sealing performance of the ball valve.

The top-entry ball valve is designed as an integrated valve body. Its support and ball rod fixed by an upper-assembled pivot and an integrated pivot respectively and the integrated high-strength ball rod ensure an accurate ball positioning. The unique technology of retractable valve seat is adopted, realizing online replacement of valve stem, valve stem seal rings, metal valve seats and preloaded springs.

The fully-welded ball valve adopts forged material, welded body, instead of bolts and nuts, to aviod any potential leakage from body. The forged body with regular structure and even thickness can avoid shrinkage cavities, pin holes, cracks, sand holes and other defects occurring to casting body valves. Fully-welded ball valves can be spherical and cylindrical type. Usually the spherical type has only one welding seam on the body, the cylindrical type has two welding seam on the body.

Seat of metal to metal ball valves have special protection and tight shut-off design to be applied to some poor conditions, such as high- temperate, high pressure and abrasive mediums, to fully solve the problem of inner leakage and outer leakage, and ensure reliable sealing with zero leakage.

The ball valve has been designed three piece body type and with two floating seats, which are movable under the pressure of drive water or oil. When drive pressure increase under the bottom side of seats, the floating seat can attach the ball’s surface tightly, other more, When drive pressure decrease under the bottom side of seats, the floating seat can leave the ball’s surface. The ball valve is equipped with the movable seat seal ring which can generate displacement under the pressure of drive medium. So that biggest size ball valve can be easy to drive by actuator and the sealing performance of the ball valve can to be control. The ball valve is suitable for service of water power station main pipe-line system, or strictly at functional reliability system.

Cryogenic ball valve is suitable for service of working temperature down to －196℃, such as LNG, LPG, and air separation industry. The cryogenic trunnion ball valves are produced by the most advanced technology. It is designed with LIP SEAL which can keep valves with excellent sealing performance in ultra-low temperature. Wuzhou cryogenic test laboratory can test valves up to NPS32.