How to run and maintain the valve during operation

1 Keep the outside of the valve and the moving parts clean and protect the integrity of the valve paint. The surface of the valve, the trapezoidal thread on the stem and stem nut, the sliding part of the stem nut and the bracket, and the gears, worm gears, etc. are liable to deposit a lot of dirt, oil and media residue, causing wear and corrosion to the valve. Therefore, the valve should always be kept clean. The general dust on the valve is suitable for brush sweeping and compressed air purging. It can even be brushed with a copper wire brush until the working surface and the mating surface show a metallic luster, and the painted surface shows the original color of the paint. Steam traps should be specially staffed and inspected at least once per shift; periodically flush the flush valve and the steam trap bottom plug, or periodically disassemble and rinse to prevent dirt from clogging the valve.

2 Keep the lubrication of the valve, the valve trapezoidal thread, the stem nut and the sliding part of the bracket, the bearing position, the meshing part of the gear and the worm wheel and other matching active parts need good lubrication conditions, reduce the mutual friction and avoid mutual wear. . For parts that do not have oil cups or grease nipples, which are easily damaged or lost during operation, the lubrication system should be repaired and the oil circuit should be clarified.

The lubrication part should be refueled regularly according to the specific conditions. Frequently opened, high temperature valves are suitable for refueling once a week to one month; valves that do not open frequently and are not hot may have a longer refueling cycle. Lubricant organic oil, butter, molybdenum disulfide and graphite. Oil is not suitable for high temperature valves; butter is also not suitable, they will be lost due to high temperature melting. The high temperature valve is suitable for adding molybdenum disulfide and wiping graphite powder. Lubricated parts exposed to the outside, such as trapezoidal threads, interdental parts, etc., are greased with grease, which is highly susceptible to dust. Lubricating with molybdenum disulfide and graphite powder is not easy to contaminate dust and the lubrication effect is better than butter. Graphite powder is not easy. Apply directly, use a little oil or water to mix and paste.

The oil-filled plug valve should be filled with oil according to the specified time, otherwise it will be easy to wear and leak.

3 Keep the two pieces complete and in good condition. The bolts of the flange and bracket should be complete and full, and no looseness is allowed. If the fastening nut on the handwheel is loose, tighten it in time to avoid wearing the joint or losing the handwheel. After the handwheel is lost, it is not allowed to replace the handwheel with a flap. It should be timely. The packing pressure difference does not allow skew or no pre-tightening clearance. In an environment that is easily contaminated by dirt such as rain, snow, dust, etc., the valve stem should be fitted with a protective cover. The scale on the valve should be kept intact and accurate. Valve seals, caps, pneumatic accessories, etc. should be complete. The insulation jacket should be free from dents and cracks.

In addition, it is not allowed to tap, support heavy objects or stand on the valve to avoid soiling the valve and damaging the valve. In particular, non-metallic mesh doors and cast iron valves are even more banned.

Maintain routine maintenance of the electric device. The maintenance of the electric device is generally not less than once a month. The maintenance contents are as follows: the exterior should be clean, no dust is deposited, the device is not contaminated by soda water or oil; the sealing surface and the point should be firm and tight. No leakage phenomenon; the lubrication part should be refueled according to the regulations, the valve yoke nut should be greased; the electrical part should be intact, no phase loss, the automatic switch and the thermal relay should not trip, the indicator light is correct.