The purpose of Valve maintenance

The purpose of the valve maintenance operation is to ensure that the valve is  in a perennial clean, good lubrication, and complete and normal operation of the state.

1.Valve Cleaning

The surface of the valve, the stem and stem nut on the trapezoidal thread, the stem nut and bracket sliding parts, as well as gear, worm and other parts, are easy to plot a lot of dust. Oil stains and other dirty goods may ruins and corrodes the valves . Then keep the valve outside parts and the active parts clean will  protect the integrity of the valve paint. This is obviously very important. The dust brush of valve is whisk and apply to compressed air purge; trapezoidal threads and teeth parts are for booty rag scrub. Oil stains and medium stains are suitable for steam blowing, even with a wire brush to wash, until the processing side, with the surface showing metallic luster. Traps should be charged by exact persons, and be checked by each class at least one time.regularly Open the flushing valve and wash the  end of the plug flow valve  regularly in case of  loot plug valves.

2.Valve lubrication

The trapezoidal thread, the stem nut and the bracket sliding parts, gear parts, gear and bearing parts of the worm gear and the worm and other sites with activities, are in need of better lubrication and reduce friction between each other . That is to avoid tearing each other. Some special parts have oil or grease, if damaged or lost in the operation,  they should be installed for repairing  and dredging oil way.

Lubrication parts should be regularly refueling according to the specific circumstances. The valves which are regularly  open, with  high temperature are  suitable for refueling  once a week or a month. The valves which are not always open, with lower temperature can be refueling for  longer periods. Lubricants are made of oil, butter, MoS2 and graphite etc.. High-temp valves are not suitable for oil and butter, they will be melt and lost  because of heat ,it is suitable for injection of MoS2 and graphite powder wipe.  For lubrication of the exposed parts, such as trapezoidal thread, gear and other parts, the use of a butter oil is easily contaminated dust, and the use of MoS2 and graphite powder lubrication, are not exposed to dust. Graphite is not easy to smear directly, it can be mixed with a little oil or water.

Oil seal plug valve should be in accordance with the time of filling, or it’s easy to wore and leakage.

3.Valve Maintenance

All kinds of valve parts should be completed in the valve operation. Integral flange and bracket bolts are indispensible. Screw threads are also should be complete. They are not allowed  to be loosening. The hand wheel on the fastening nut, should be tightened in time to avoid  losing  the junction of hand wheel and nameplate. If hand wheel  lost, instead of spanner should be promptly filled. The packing gland is not allowed to skew preload gap. The valves which are easy to ruined by rain, dust, sand and other dirt contamination  should  install protective cover. The rod on the valve should be kept completed, accurate and clear. Valve seals, cap, pneumatic accessories should be fully intact. Thermal insulation jacket should not be dent and crack.

It is not allowed to beat valve in the operation, and also not to stand on it  or bearing weight, especially non-metallic valve and cast iron valve. 

Related recommendation:

Why choose plastic butterfly valve?

Why stainless steel rust?

Commonly used materials of Valve body

Product recommendation:

PTFE Lug type Butterfly Valve 6 inch API609

DIN 4 Inch Bellows Globe Valve

Full Lining Rubber butterfly valve EN593 with worm gear