1. The fluid resistance is small, and its resistance coefficient is equal to that of the same length of pipe. 2. Simple structure, small volume and light weight. 3. It is compact and reliable. At present, the sealing surface material of ball valve is widely used with good sealing performance, and it has been widely used in vacuum system. 4. It is easy to operate and fast to open and close. Only 90 ° rotation is needed from full opening to full closing, which is convenient for remote control. 5. The maintenance is convenient, the ball valve structure is simple, the sealing ring is generally movable, and it is convenient to dismantle and replace. 6. When the valve is fully open or closed, the sealing surfaces of the ball and valve seat are isolated from the medium, and the medium will not cause erosion of the valve sealing surface. 7. Wide range of application, diameter from small to several millimeters, large to several meters, from high vacuum to high pressure. According to the channel position, the high level ball valve can be divided into straight type, three-way type and right angle type. The latter two kinds of ball valves are used to distribute medium and change the flow direction of medium. Three piece ball valve installation and maintenance should pay attention to the following: 1. To leave the valve handle rotation position. 2. It can not be used as throttling. 3. The ball valve with transmission mechanism shall be installed vertically.

    Eccentric hemisphere valve is to rotate the valve chain to make the valve unblocked or blocked. The ball valve has the advantages of light switch, small volume, large diameter, reliable sealing, simple structure and convenient maintenance. The sealing surface and spherical surface are often in closed state and are not easy to be eroded by medium, so they are widely used in various industries.

 Distributing and changing the flow direction of the medium. Ball valve is a new type of valve widely used in recent years. It has the following advantages: 1. The fluid resistance is small, and its resistance coefficient is equal to that of the same length of pipe. 2. Simple structure, small volume and light weight. 3. It is compact and reliable. At present, the sealing surface material of ball valve is widely used with good sealing performance, and it has been widely used in vacuum system. 4. It is easy to operate and fast to open and close. Only 90 ° rotation is needed from full opening to full closing, which is convenient for remote control. 5. The maintenance is convenient, the ball valve structure is simple, the sealing ring is generally movable, and it is convenient to dismantle and replace. 6. When the valve is fully open or closed, the sealing surfaces of the ball and valve seat are isolated from the medium, and the medium will not cause erosion of the valve sealing surface. 7. Wide range of application, diameter from small to several millimeters, large to several meters, from high vacuum to high pressure. When the ball is rotated 90 degrees, the inlet and outlet should be spherical, so as to cut off the flow. Eccentric hemispherical valve is a new type of ball valve. It has some unique advantages of its own structure, such as no friction on the switch, no wear of seal and small opening and closing torque. This reduces the size of the actuator. Equipped with multi rotary electric actuator, the medium can be adjusted and cut off tightly. It is widely used in petroleum, chemical industry, urban water supply and drainage, etc.

A. When opening process 1 is in the closed position, the ball is pressed on the valve seat by the mechanical pressure of the valve stem. 2. When the handwheel is turned anticlockwise, the valve stem moves in reverse direction, and the angular plane at the bottom of the valve makes the ball break away from the valve seat. 3. The valve stem continues to lift and interacts with the guide pin in the screw groove of the valve stem, so that the ball begins to rotate without friction. 4 until it reaches the full open position, the valve rod is lifted to the limit position, and the ball is rotated to the full open position. B. When closing process 1 is closed, turn the handwheel clockwise and the stem begins to drop and the ball leaves the seat to start rotating. 2. Continue to rotate the hand wheel, the valve rod is affected by the guide pin embedded in the screw groove on the hand wheel, so that the valve rod and the ball rotate 90 ° at the same time. 3 near closing, the ball has been rotated 90 ° without contact with the seat. 4. After several turns of the handwheel, the angular plane at the bottom of the valve stem is mechanically wedged to press the ball against the valve seat to achieve complete sealing.

1. Open and close without friction. This function completely solves the problem of traditional valve sealing affected by mutual friction between sealing faces.

2. Top mounted structure. The valve installed on the pipeline can be directly inspected and maintained, which can effectively reduce the shutdown of the device and reduce the cost.

3. Single seat design. It eliminates the problem that the medium in the valve chamber affects the safety due to abnormal pressure rise.

4. Low torque design. The valve stem of special structure design can be opened and closed easily with a small handle valve.

5. Wedge seal structure. The valve is sealed by pressing the ball wedge onto the valve seat by the mechanical force provided by the valve stem, so that the sealing performance of the valve is not affected by the change of pipeline pressure difference, and the sealing performance is reliably guaranteed under various working conditions.

6. Self cleaning structure of sealing surface. When the ball tilts away from the valve seat, the fluid in the pipeline passes through the sealing surface of the ball in a 360 ° uniform manner, which not only eliminates the local scouring of high-speed fluid on the valve seat, but also washes away the accumulation on the sealing surface, so as to achieve the purpose of self-cleaning. Application eccentric hemisphere valve is suitable for sewage treatment, pulp, alumina, urban heating and heating to be strictly marked occasions; suitable for power plant, hydraulic slag removal or gas pipeline control.