The obvious difference between the three-way ball valve and the two-way valve in appearance is another flow path。Three-way ball valve is mainly used to change the flow direction of the medium。In addition to inlet A, outlet B and reversing port C, the three-way ball valve also does not have the ability to transfer flow。What is the principle and schematic diagram of the three-way ball valve switch?
Three-way ball valve switch principle:
A. Opening process
1. In the closed position, the mechanical pressure of the stem pushes the ball towards the seat。
2. Turn the handwheel counterclockwise to move the stem in the opposite direction, while the lower angular plane releases the ball from the seat。
3, the valve rod continues to rise and interact with the guide pin in the spiral groove of the valve rod, so that the ball begins to rotate without friction。
4, the valve stem rises to the position, the ball rotates to the open position, until it reaches the open position。
B. End the process
1, close, turn the handwheel clockwise, the stem will start to fall, the ball will start to rotate away from the seat。
2. Continue to rotate the handwheel。The valve rod is inserted into the spiral groove at the top by the action of the guide pin, so that the valve rod and the steel ball rotate 90° at the same time。
3. When trying to close, the ball rotates 90° without touching the seat。
4. In several turns of the handwheel, the corner plane at the bottom of the valve rod is mechanically wedged, pushing the ball to firmly push the valve seat and seal it。
Three-way ball valves are mainly divided into L-type and T-type, and the difference between them is as follows: T-type allows three orthogonal pipelines
