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The advantages of the electric ball valve: the fluid resistance is small, and the full-diameter ball valve has substantially no flow resistance. The maintenance is convenient, the electric ball valve has a simple structure, and the sealing ring is generally movable, and the disassembly and replacement are relatively convenient. The structure is simple, small in size and light in weight. The operation is convenient, the opening and closing is rapid, and the rotation is 90° from full opening to full closing, which is convenient for long-distance control. Since the ball valve is wiping during opening and closing, it can be used in a medium with suspended solid particles. Tight and reliable.
It has two sealing faces, and the sealing surface material of the ball valve is widely used in various plastics, and has good sealing performance and can achieve complete sealing. It has also been widely used in vacuum systems. When fully open or fully closed, the sealing surface of the ball and the valve seat is isolated from the medium, and the medium does not cause erosion of the sealing surface of the valve. Wide range of applications, from small to a few millimeters, up to a few meters, from high vacuum to high pressure can be applied.
The electric ball valve packing should be locked again. If there is micro-bleed at the packing, the stem nut must be locked. Note: Do not lock too tightly, usually lock 1/4 turn to 1 turn, the leak will stop.
Electric ball valve replacement seat and seal
A), disassembly
Put the valve in the half-open position to flush and remove dangerous substances that may exist inside and outside the valve. Close the electric ball valve, remove the connecting bolts and nuts on the flanges on both sides, and then completely remove the valve from the line. Disassemble the drive unit-actuator, connecting bracket, lock washer, stem nut, butterfly shrapnel, Grennan, wear plate and stem packing. Remove the body cover connecting bolts and nuts, separate the bonnet from the valve body, and remove the bonnet gasket. Verify that the ball valve is in the "off" position, which allows it to be easily removed from the valve body and then the seat is removed. Push the valve stem down from the hole in the valve body until it is completely removed, then remove the O-ring and the under-filler.
Note: Exercise caution to avoid scratching the stem surface and the body packing seal.
B), reassembly
Cleaning and inspection of the removed parts, it is highly recommended to replace the seals such as the seat and bonnet gasket with spare parts. Assemble in the reverse order of disassembly. Use the specified torque to cross-lock the flange connection bolts. Lock the stem nut with the specified torque. After installing the actuator, input the corresponding signal to rotate the spool through the rotary stem to open the valve to the open and closed positions. If possible, perform a pressure seal test and performance test on the valve in accordance with relevant standards before returning the pipe.
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