According to its channel position can be divided into straight-through, right-angle type.
The operating principle of the electric cut-off valve is to make the valve unblocked or blocked by the rotary valve. Gate Valve Switch Light, small size, can be made into a large caliber, sealing reliable, simple structure, easy maintenance, sealing surface and spherical surface is often closed, not easily by the media erosion, in various industries have been widely used.
A, opening process
1 in the closed position, the valve body under the mechanical pressure of the stem, tight pressure on the seat.
2 when the counterclockwise rotation of the wheel, the stem is reversed movement, the bottom corner of the plane to remove the ball valve seat.
3 The stem continues to ascend and interacts with the guide pins in the screw groove of the stem to make the sphere start to rotate without friction.
4 until the full open position, the stem lift to the limit position, the ball rotates to full open position.
B. Shutdown process
When the 1 is closed, rotate the handwheel clockwise and the stem starts to drop and the ball leaves the seat and rotates.
2 continue to rotate the handwheel, the stem is embedded in its upper spiral groove in the role of the guide pins, so that the valve stem and the brake plate at the same time 90 °.
When the 3 is close, the brake body has been rotated 90° with no contact with the valve seat.
4 The last laps of the handwheel, the angular plane at the bottom of the stem is mechanically wedged to the pressing sphere, so that it is tightly pressed on the seat to fully seal.