A ball valve is integrated inside the ball, PTFE ring, a lock nut, the ball has slightly smaller diameter than the pipe diameter, similar to the wide type ball valve.
Two piece ball valve is composed of two parts, the sealing effect is better than a piece of ball valve, the diameter of the ball has same diameter of the pipe, easy to disassemble than a piece of ball valve.
Three way ball valve is composed of three parts, both sides of the valve cover and the middle of the valve body, the three piece ball valve is different from the two piece ball valve and a piece of ball valve is located in the demolition of convenient maintenance.
Distinguish from pressure
Three chip pressure is much higher than one piece and two piece ball valve. The main three - piece ball valve outside the fixed by the four bolts, play a good role in fastening. Casting valve can reach 1000PSI, pressure is 6.9MPa. Higher pressure is to use forged valve body.
Ball valve can be divided according to the structural form:
Floating ball valve: ball valve is floating in the medium pressure, the ball can produce a certain amount of displacement and pressure on the export side of the sealing surface, to ensure that the outlet seal. Floating ball valve has a simple structure, good sealing, but the ball to bear the load of the working medium all passed to the export seal ring, so to consider whether the sealing ring material can withstand the work load of the sphere medium. This structure is widely used in medium and low pressure ball valve.
Fixed ball valve: ball valve is fixed, the pressure does not produce movement. Fixed ball valve has floating valve seat, by the media pressure, the valve seat to move, so that the sealing ring tightly pressed on the ball to ensure the seal. The ball is in the upper and lower shaft with bearings with operating torque, is suitable for high pressure and large diameter of the valve. In order to reduce the valve operating torque and increase the reliability of the seal, the valve seal, the sealing surface between the pressure injection of special lubricating oil, to form a layer of film that enhances the sealing, and reduce operating torque, more suitable for large-diameter high-pressure valve.
Elastic ball valve: ball valve is elastic. Ball and valve seat seal are made of metal materials, sealing pressure than the large, relying on the media itself has been unable to meet the pressure seal requirements must be imposed external force. This valve is suitable for high temperature and high pressure medium. The elastic ball is provided with an elastic groove at the lower end of the inner wall of the sphere. When the channel is closed, the wedge head of the valve rod is used for the ball to be opened and the valve seat is pressed to seal. Before the ball is rotated, the wedge head is loosened, and the ball is restored to the original shape, so that a small gap between the ball and the valve seat can reduce the friction of the sealing surface and the operating torque.
Sanitary ball valve can be divided into straight through, three and right angle according to its channel position.