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COVNA: The first brand solenoid valve electric

Ball valve installation:

1. It must be confirmed that the pipeline and valve have been cleaned before operation.

2. The actuator operation of the valve drives the valve stem to complete rotation according to the size of the input signal: 

when it rotates 1/4 turn (900) in the forward direction, the valve is closed. When reverse rotation 1/4 turn (900), 

the valve opens.

3. When the direction indicator arrow of the actuator is parallel to the pipeline, the valve opens; when the arrow is 

perpendicular to the pipeline, the valve closes.



Ball valve repair:

Longer service life and maintenance-free time will depend on several factors: under normal working conditions, 

maintaining a harmonious temperature/pressure ratio, and reasonable corrosion data



note:
When the ball valve is closed, the fluid pressure in the valve body still exists
Before maintenance, remove the pipeline pressure and leave the valve in the open position
Before maintenance, disconnect the power or air supply
Before maintenance, separate the actuator from the bracket


1. Packing lock
If the filling culvert is slightly leaking, the stem nut must be locked.
Note: Do not lock, usually lock 1/4 ring to 1 ring, the leakage will stop.


2. Replace the valve seat and seal


A. Disassembly


Leave the valve in the half-open position to flush out the dangerous substances that may exist inside and outside the valve. 

Close the ball valve, remove the bolts and nuts of the flanges on both sides, and completely remove the valve from the pipeline.

Disassemble the drive device-actuator, connecting bracket, lock washer, stem nut, butterfly shrapnel, glam, 

wear-resistant sheet, stem packing in order.

Remove the body cover connecting bolts and nuts, separate the valve cover from the valve body, and remove the 

valve cover gasket.

Confirm that the valve ball is in the off position, which can be easily taken out of the valve body, and then remove the valve seat.

Gently push the stem down from the hole in the valve body until it is completely taken out, and then take out the O-ring 

and packing ring.

Note: Please operate carefully to avoid scratching the surface of the valve stem and the packing seal of the valve.


B. Reassemble

Clean and inspect the parts under investigation. It is strongly recommended to replace the seat and bonnet gaskets 

and seals with spare parts kits.

Reverse the order of disassembly and assembly.
Use the specified torque to tighten the flange bolts crosswise.
Tighten the nut with the specified torque.

After installing the actuator, rotate the valve stem to drive the valve core to rotate the corresponding input signal 

to make the valve open and close.

If possible, after installing the pipeline, test the valve's sealing pressure and performance according to the standard.