Q645/Q644 high platform three-way pneumatic ball valve

1. Brief introduction of Q644/Q645 pneumatic three-way ball valve:

1. The Q644/Q645 pneumatic three-way ball valve adopts an integrated structure, a four-sided valve seat sealing type, flange connection, high reliability, and a lightweight design.

2. The three-way ball valve has long service life, large flow capacity and low resistance.

3. Three-way ball valves are divided into single-acting and double-acting types according to their action types. The single-acting type is characterized in that once the power source fails, the ball valve will be in the state required by the control system.

Ball valve and gate valve are the same type of valve. The difference is that its closing part is a sphere. The sphere rotates around the center line of the valve body to achieve opening and closing. The ball valve is mainly used to cut off, distribute and change the flow direction of the medium in the pipeline. The ball valve is a new type of valve that is widely used.

2. Advantages of Q644/Q645 pneumatic three-way ball valve:

1. The fluid resistance is small, and its resistance coefficient is equal to that of a pipe section of the same length.

2. Simple structure, small size and light weight.

3. It is tight, reliable, and well-sealed, and has been widely used in vacuum systems.

4. It is easy to operate and open and close quickly. It only needs to rotate 90° from fully open to fully closed, which is convenient for remote control.

5. The maintenance is convenient, the structure of the ball valve is simple, the sealing ring is generally movable, and it is convenient to disassemble and replace.

6. When fully open or fully closed, the sealing surface of the ball and the valve seat is isolated from the medium, and the medium will not cause erosion of the valve sealing surface when the medium passes.

7. It has a wide range of applications, with a diameter ranging from a few millimeters to a few meters, and can be applied from high vacuum to high pressure.

Ball valves can be divided into straight-through type, three-way type and right-angle type according to their channel position. The latter two ball valves are used to distribute the medium and change the flow direction of the medium.

3. The working principle of Q644/Q645 pneumatic three-way ball valve:

A. Opening process

1 In the closed position, the ball is pressed against the valve seat by the mechanical pressure of the valve stem.

2 When the handwheel is turned counterclockwise, the valve stem moves in the opposite direction, and the angular plane at the bottom causes the ball to separate from the valve seat.

3 The valve stem continues to lift and interacts with the guide pin in the spiral groove of the valve stem, so that the ball begins to rotate without friction.

4 Until it reaches the fully open position, the valve stem is raised to the limit position, and the ball rotates to the fully open position.

B. Closing process

1 When it is closed, turn the handwheel clockwise, the valve stem begins to descend and the ball leaves the valve seat and starts to rotate.

2 Continue to rotate the handwheel, the valve stem is acted on by the guide pin embedded in the upper spiral groove, so that the valve stem and the ball rotate 90° at the same time.

3 When it is about to close, the ball has rotated 90° without contact with the valve seat.

4 After the first few turns of the handwheel, the angular plane at the bottom of the valve stem mechanically wedges and presses the ball, making it tightly pressed on the valve seat to achieve a complete seal.

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