The operation of valves, all valves should be complete, intact. Bolt flange and an indispensable support, threads should be in good condition, does not allow loosening. Fastening nut hand wheel, if found loose should be tightened, so as not to wear or loss of the junction of the handwheel and nameplate. The hand wheel if lost, not allowed to replace live wrench, should be promptly filled. The packing gland is not allowed to skew or no preload gap. Rain and snow on the vulnerable, dust, sand and other dirt contamination in the environment of the valve, the valve stem to install protective cover. Valve on the gauge should maintain complete, accurate, clear. Valve seals, cap, pneumatic accessories should be complete. Insulation jacket should have no dents, cracks. Is not allowed in the operation of the valve on the beat, stop or bearing weight; especially non-metallic valve and cast iron valve, but also prohibited.
The maintenance of the idle valve
The maintenance of the idle valve should be carried out together with the equipment, pipeline, shall be as follows:
First, clean the valve
Purge valve cavity should be clean, no residual material and water solution, external to the valve should be wiped clean, no dirt, oil and dirt removing,
Two, installed for valves
After missing pieces of the valve, can not rob Peter to pay Paul, should be installed for valves, and create favorable conditions for the next step, ensure that the valve is in good.
Three, anti-corrosion treatment
Took out the stuffing box packing, to prevent galvanic corrosion stem, the valve sealing surface, stem, stem nut, machined surfaces and other parts, as the case with anti-rust agent, grease paint areas shall be brushed with antirust paint. L good, good.
Four, the protection of
To prevent his substance, man-made fiddle and demolition, if necessary, should be fixed valve parts, packaging to protect the valve.
Five, regular maintenance
Longer idle valve, should be regularly checked, regular maintenance, prevent corrosion and damage the valve. Idle time is too long for the valve pressure test, should be qualified and pipeline equipment, apparatus, together, can be used.
Maintenance of electric equipment
Electric equipment daily maintenance work, generally not less than once a month. Maintenance of the content is: clean appearance, no dust deposition; device without steam, water, oil contamination. Electric device has good sealing, the sealing surface should be complete, firm, tight, no leakage. Electric devices should be good lubrication, on time in accordance with the provisions of the gas, the valve stem nut should add the lubricating grease. The electrical part should be intact, erosion and avoid moisture and dust; if the damp, use 500V megohmmeter to measure all current-carrying parts and insulation resistance between the shell, its value is not lower than o.38 megabytes ohm, or deal with the related parts in drying. Automatic switch and heat relay should not trip, indicator light shows the correct, no lack of phase, short circuit, open circuit fault. Electric device of the normal working state, open, flexible.
Maintenance of pneumatic device
Pneumatic device maintenance, generally not less than once a month. The main contents are: the maintenance of clean appearance, no dust deposition; device shall not be steam, water, oil contamination. Gas seal device should be good, the sealing surface should be complete, solid, rigorous non-destructive. Manual operating mechanism should be good lubrication, flexible opening and closing. Cylinder inlet and outlet joint does not allow any injury; parts of the cylinder and the air pipe system should be examined carefully, there shall be no leakage performance. The pipe is not allowed to have depression, the signal should be in good condition, light signal device should be intact, whether the connection thread pneumatic signal or electric signal should be intact, no leakage. Pneumatic valve device should be intact, no leakage, flexible opening, air flow. The pneumatic device should be in normal working condition, open, flexible.
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