Working procedures to complete cleaning check first shaded check working content and fixed valve; Make or keep gasket, packing; Ready to need to use kerosene or gasoline cleaning tools and materials fasteners, sealing surface, the valve stem, stem nut, valve body, valve cover, support cloth scrub. While cleaning, wipe, colored in check valve stem and disc check on seal and seal face. For double ram sealing surface shaded check, according to official color inspection methods for technical requirements valve parts, tools and materials conform to technical requirements and put in order, not allowed to casually piled on the floor cleaned valves should be without oil, rust stains, valves shall comply with technical requirements for the shadow, round and clear continuous working procedures with the valve stem packing work content installed stem nut, Industrial Valves stem, assembled and with good lubricant. Rising stem stem from stuffing box bottom hole, sets of good gland, screwing in stem nut; Non-rising stem Kan lever of shoulder clamping between the stuffing box and the valve cover, stem, screwing in stem nut; Stem nut on the cover, generally through the valve cover, stem pressing sleeve nut, screwing should be installed after pressing-bushed opening indicator ( For non-rising stem) And the hand wheel. According to regulations by ring pack good packing, symmetrical evenly pressed tight lid, pressing sleeve. Removable stents, good packing up and technical requirements should be assembly correctly, clearance fit, the appropriate stem nut lubrication system in good packing installation conform to technical requirements. Stem, stem nut, gland, stuffing box should be on the same axis, gland and a preloaded gap. Stem rotating flexible, no jam phenomenon process formally shading check assembly test arrangement work content according to different structure forms, ram installed on the valve stem in sequence, with false gaskets, check the gate mark, cover cover. Use normal closing force was carried out on the sealing surface shaded check blow broom, wipe the body and bonnet, disc, seal face clean, tuned damper to a higher position, it conforms to the conditions of gaskets, check the gate mark, good cover, symmetric screw down the bolt equably according to provisions of dry valve strength test and leakage test. Painting, playing listed or steel grade. Fill in the repair and test record. The gate is closed. Sealing and packaging technical requirements as the stem and disc joint meets the requirements. Dye check the shadow, round and continuous clean thoroughly, clear stent position correctly, bolt material, elastic, check the flange clearance at four o 'clock is consistent, and not less than 2 mm. Flexible operation, proper instructions properly closing force, pressure test method is correct. Within the prescribed period of time does not leak or allow trace for qualified valve leakage in dry, paint meets the requirements. Fill in record, the text is concise, clear. Steel grade, listed in the dangerous place. The packing is firm
The global market was valued at cast iron valve in os gate valve and is expected to reach a market value of resilient gate valve by resilient valve, with a CAGR of os & y valve fire protection during the forecast period.
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