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Ball valve can be divided by structural form:
Floating ball valve: the ball of the ball valve is floating, under the action of the medium pressure, the ball can produce a certain displacement and press on the sealing surface of the exit end, to ensure that the outlet end seal. The structure of the floating ball valve is simple and well sealed, but the load of the sphere under the working medium is all transmitted to the outlet sealing ring, so it should be necessary to consider whether the sealing ring material can withstand the working load of the sphere medium. This structure is widely used in medium and low pressure Stainless Steel Ball Valve.
Fixed ball valve: The ball of the ball valve is fixed and does not move after pressure. The fixed ball valves are equipped with floating valve seats. After receiving the medium pressure, the Plastic Ball Valve seat moves and pushes the sealing ring on the sphere to ensure the sealing. Usually installed in the upper and lower shaft bearing, operating a small torque, suitable for high pressure and large caliber valves. In order to reduce the operating torque of the 2PC Threaded Stainless Steel Ball Valve and increase the reliability of the sealing, the oil sealing ball valve appeared, including the special lubricating oil, to form a layer of oil film, which enhances the sealing, and reduces the operating torque, more suitable for high pressure large diameter ball valve.
Elastic ball valve: The sphere of the ball valve is elastic. The sphere and the valve seat sealing ring are made of metal material, the sealing specific pressure is very large, relying on the pressure of the medium itself has not reached the requirements of sealing, the external force must be applied. This valve is suitable for high temperature and high pressure media. An elastic sphere opens an elastic groove at the lower end of the inner wall of the sphere and obtains elasticity. When closing the channel, use the wedge head of the stem to open the sphere with the seat pressure to reach the seal. Release the wedge head before turning the sphere, and the sphere returns to its original shape, creating a small gap between the sphere and the valve seat, and reducing the friction and operating torque of the sealing surface.
The ball valve can be divided into straight-through, three-pass and right-angle type. The three-way ball valves are of T type and L type. T can make three orthogonal pipelines to connect and cut off the third channel, play the role of diversion and confluence. The L type can only connect two pipelines orthogonal to each other, and cannot maintain the third pipe at the same time, but only assigns.
1. The three-way ball valve adopts an integrated structure. The four-side sealing type of the Stainless Steel Ball Valve by Flange seat has little flange connection and high reliability, and the design is lightweight.
2. The three-way ball core is divided into T and L types, with long service life, large circulation capacity and small resistance.
3. The ball valve is divided into single action and double action in two types. The characteristic of the single action type is that once the power source fails, the ball valve will be in the state required by the control system.
Ball valve can be divided into one piece, two piece and three piece according to its composition.
Usage method:
1) Ensure that the line and valve have been washed before operation.
2) The valve rotates the valve rod according to the actuator input signal: the valve closes at 1 / 4 turn (900). Open on reverse rotation 1 / 4 lap (900).
3) When the actuator direction indicates that the arrow is parallel to the pipeline, the valve is open; when the indicating arrow is perpendicular to the pipeline, the valve is closed.
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