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Ball Valve Installation And Maintenance Methods

Sep 05, 2017

Ball Valve Installation:

1, must confirm the pipeline and valve operation has been cleaned before.

2, Valve actuator operation according to the size of the input signal to drive stem rotation completion: The forward rotation of 1/4 laps (900), the valve closed. When the reverse rotates 1/4 laps (900), the valve opens.

3. When the actuator direction indicates that the arrow is parallel to the pipeline, the valve is opened and the valve is closed when the arrow is perpendicular to the pipeline.

Ball Valve Repair:

has a longer service life and maintenance-free time, will depend on several factors: normal working conditions, to maintain a harmonious temperature/pressure ratio, and reasonable corrosion data before the maintenance, remove the pipeline pressure and make the valve open position, before the maintenance, disconnect the power supply or gas source, repair, the execution mechanism and stent detachment.

1, packing lock tight

If the filler culvert is in the micro-leakage filling, the stem nut should be tightened.

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

Replacement of seat and seals

A, demolition

Let valve in half open position, flush valve inside and outside may exist dangerous material.

Close the ball valve, remove the bolts and nuts from both sides of the flange, and complete the valve removal from the pipe.

Remove drive device sequentially-actuator, connection bracket, loose washer, stem nut, butterfly-shaped shrapnel, glam, wear-resisting piece, stem stuffing.

Remove the body cover connecting bolts and nuts, separating the bonnet from the valve body and removing the bonnet gasket.

Confirm that the ball is in the "off" position, which can be easily removed from the body and removed from the valve seat.

Gently push the stem down through the body hole until it is fully removed, then remove the O-ring and the filler ring.

Note: Please be careful to avoid scratching the stem surface and the valve's packing seal.

B, reassemble

The cleaning and inspection of parts under investigation is strongly recommended for replacement of seat and bonnet gaskets and seals with spare parts.

Assemble in reverse order of disassembly.

With the specified torque, cross lock flange bolts.

With the specified torque, tighten the nut.

After the installation of the actuator, through the rotating stem to drive the spool to rotate the corresponding input signal, so that the valve to open and close the position.

If possible, after the installation of the pipeline, according to the standard valve sealing pressure test and performance testing.