Electric ball valve

Date:Aug 02, 2019

The electric ball valve is composed of an electric actuator and a ball valve to form an electric ball valve. It is a kind of pipeline pressure component for industrial automation process control. It is usually used for remote opening and closing (switching on and off media) of pipeline media.

The electric ball valve is divided into a floating ball valve, a fixed ball valve and an elastic ball valve according to the type of the ball valve ball.

Floating ball valve: The ball of the ball valve is floating. Under the action of the medium pressure, the ball can generate a certain displacement and press on the sealing surface at the outlet end to ensure the sealing of the outlet end. The floating ball valve has a simple structure and good sealing performance, but the load of the ball subjected to the working medium is all transmitted to the outlet sealing ring, so it is necessary to consider whether the sealing ring material can withstand the working load of the spherical medium, and when subjected to a high pressure impact The sphere may be offset. This structure is generally used for medium and low pressure ball valves.

Fixed ball valve: The ball of the ball valve is fixed and does not move after being pressed. The fixed ball valve has a floating valve seat. After the medium pressure, the valve seat moves, so that the sealing ring is pressed against the ball to ensure the seal. Usually mounted on the upper and lower shafts of the ball, the operating torque is small, suitable for high pressure and large diameter valves. In order to reduce the operating torque of the ball valve and increase the reliability of the seal, the lubricating oil is formed to form an oil film, which enhances the sealing performance and reduces the operating torque, and is more suitable for a high pressure and large diameter ball valve.

Elastic ball valve: The ball of the ball valve is elastic. Both the ball and the seat seal are made of metal material, and the sealing pressure is very large. The pressure of the medium itself cannot meet the sealing requirements, and an external force must be applied. This valve is suitable for high temperature and high pressure media. The elastic sphere is made by opening an elastic groove at the lower end of the inner wall of the sphere to obtain elasticity. When the passage is closed, the wedge of the valve stem is used to open the ball and press against the seat to seal. Before the ball is rotated, the wedge head is loosened, and the ball is restored to its original shape, so that a small gap occurs between the ball and the valve seat, which can reduce the friction and operating torque of the sealing surface.

Model description of electric ball valve:

Ball valve additional code: V means the valve core has a V-shaped structure, D means low temperature, B means heat preservation, P means eccentric structure, U and S and DY means top-loading type

Ball valve name code: Q indicates a ball valve;

Ball valve drive code: 2 means electrohydraulic, 3 means turbine, 6 means pneumatic, 7 means hydraulic, 9 means electric, manual no code;

Connection code: 1 means internal thread, 4 means flange type, 6 means welding, 7 means wafer type;

Structure type code: floating type: 1 means straight flow path, 2 means Y type tee, 4 means L type tee, 5 means T type tee; fixed type: 0 means hemisphere straight through, 6 means four way flow path, 7 Indicates straight flow to, 8 for L-type tee, and 9 for Y-type tee;

Sealing material code: B babbitt, F fluoro rubber, F46 lining fluorine, H rust steel, J lining rubber, M Monel alloy, N nylon plastic, Monel P, Y hard alloy, W valve body direct processing;

Pressure level code: 16 means the pressure is 16 kg (1.6Mpa) up to 64Mpa; 150LB means American standard pound pressure, the maximum pressure level up to 5K means the daily pressure, the maximum pressure 63K

2500LB (150LB=1.6MPA/300LB=2.5-4.0mpa/400LB=6.4mpa/600LB=10mpa);

Body material code: A titanium and titanium alloy, C carbon steel, I chrome molybdenum steel, P18-8 series stainless steel, RM2Ti stainless steel, S plastic.

dn250 ball valve

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