Installation of ball valve:

1. It must be confirmed that the lines and valves have been cleaned before they are operated.

2. The actuator operation of the valve shall drive the stem to rotate according to the size of input signal: when the valve is rotated 1 / 4 turn (900) in the forward direction, the valve will be closed. When the reverse rotation is 1 / 4 turn (900), the valve opens.

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

Ball valve maintenance:

Longer service life and maintenance free time will depend on several factors: maintaining a harmonious temperature / pressure ratio under normal operating conditions, and reasonable corrosion data

Note: the fluid pressure in the valve body still exists when the ball valve is closed

Remove line pressure and leave valve in open position before service

Disconnect the power supply or air source before maintenance

Before servicing, detach the actuator from the bracket

1. Packing lock

If the packing culvert is in the case of slight leakage filling, the stem nut must be locked.

Note: do not lock, usually lock 1 / 4 ring to ring 1, leakage will stop.

2. Replace seat and seal

A. Removal

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

Close ball valve, remove bolts and nuts from flange on both sides and remove valve completely from pipe.

Remove the drive actuator, connection bracket, lock washer, stem nut, butterfly spring, gnan, wear-resistant piece and stem packing in sequence.

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

Make sure the ball is in the “off” position, which can easily be taken out of the valve body and then the seat removed.

Push the stem down from the valve body bore until it is fully removed, then take out the O-ring and packing ring.

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

picture

B. Reassembly

Clean and check the parts under inspection. It is highly recommended to replace the seat and bonnet gasket and seal with spare parts package.

Assemble in reverse order of disassembly.

Cross lock flange bolts with specified torque.

Lock the nut with the specified torque.

After installing the actuator, the valve core is driven to rotate the corresponding input signal by rotating the valve stem to make the valve to the position of opening and closing.

If possible, after installation of the piping, the valve seal pressure test and performance test shall be conducted according to the standard.