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Self-sealing gate valve maintenance process
5.1 Self-sealing gate valve overview and parameters 5.1.1 Overview of self-sealing gate valve gate valve is the use of the valve along the center of the vertical direction of the line to move to achieve open or close the pipeline access. Gate valve opening and closing parts are the main flap and valve seat. Gate and fluid flow vertical, changing the valve flap and the relative position between the valve seat, can change the channel cross-sectional area size, thus changing the flow. In order to ensure close tight, valve and seat sealing surface grinding. Self-sealing gate valve is the use of the valve medium pressure acting on the self-sealing valve cover and the displacement of the lower part of the self-sealing gasket and the four ring due to self-sealing gasket pressure seal. Since the characteristics of self-closing valve is complex structure, larger size, higher prices; open slow, no water hammer phenomenon, easy to adjust the flow; the higher the pressure, the better the sealing. The disadvantage is the larger sealing surface, easy to wear. 5.1.2 Self-sealing gate valve main performance parameters 5.1.2.1 B21-4114P-02TS-M18''ANS1CL.2500; -6170PSI @ 100? F Shanghai Boiler Factory 5.2 self-sealing gate valve inspection steps, methods and quality standards 5.2.1 Self-sealing gate valve preparation 5.2.1.1 Preparation. 5.2.1.1.1 do a good job ticket, the valve on both sides of the pipeline and equipment in operation cut off, and the net release of net. If the electric door should be well blackout measures 5.2.1.1.2 confirm there is no pressure in the pipe and valve body. 5.2.1.1.3 ready for maintenance tools and necessary parts and components. 5.2.1.1.4 will disassemble the valve screw spray agent. 5.2.2 self-sealing gate valve repair steps, process 5.2.2.1 valve disassembly 5.2.2.1.1 first manually open the valve 2-3 laps. 5.2.2.1.2 Loosen the ring nuts and pressure plate root Glenn nuts, remove the door frame screws. 5.2.2.1.3 Remove the electric head connecting nut, turn the hand wheel towards the valve plug, lift the electric head by the chain, and then remove the packing plate, gland, door frame and other components in turn. 5.2.2.1.4 downward move the door bracket, and then inverted chain valve stem, gate and gate valve together hanging body out of the valve body. 5.2.2.1.5 check the valve port damage, and the gate valve outlet to make a directional mark. 5.2.2.1.6 Remove the valve rod from the door bracket and pull out the packing 5.2.2.1.7 When the first type of closing mechanism is removed, remove the pin connecting the valve stem and the racking frame and remove it from the racking frame Stem, turn the gate 90 ° until it emerges from the socket and remove it from the gate rack, remove the lateral push ring and the other gate. This kind of structure has a lower part of the racking frame with through holes, two pin shafts and one spring placed in the hole, the pin shaft is under the action of a spring, Tools can be used to withstand one end of the first pin, and then turn the ram. 5.2.2.1.8 The second type of shut-off mechanism in the demolition, the first bend the preventive pad, unscrew the nut, lift the upper gate holder, hold the gate to avoid falling from the racks from the racks Remove the gate. 5.2.2.2 inspection and repair: 5.2.2.2.1 gate valve seat sealing surface, the application of special grinding tools for grinding. 5.2.2.2.2 The valve flap can be grinded by manual or grinding equipment. For example, the surface of the valve has deeper manger and groove, which can be machined with a lathe or grinding machine and polished after leveling. 5.2.2.2.3 clean the bonnet and seal packing, self-sealing packing to remove the inner and outer wall pressure ring so that the pressure ring can be successfully set into the upper part of the valve cover, easy to compress packing. 5.2.2.2.4 Clean packing packing in the room, check its internal packing ring is intact, the hole and stem clearance should meet the requirements, the outer ring and the packing box wall without jam. 5.2.2.2.5 Clean gland packing and pressure plate rust, the surface should be clean, intact, gland bore and stem clearance should meet the requirements, the outer wall and packing room should be no jam, otherwise it should be repaired. 5.2.2.2.6 loosen hinge bolts, check the threaded part should be intact, the nut intact, hand can be screwed to the root of the bolt, the pin rotation flexible. 5.2.2.2.7 clean the stem surface rust, check for bending, straightening if necessary. The trapezoidal thread part of the intact, no broken buckle injury, after cleaning coated lead powder. 5.2.2.2.8 The hexagonal ring clean, smooth surface. Plane can not have burrs curling. 5.2.2.2.9 frame and self-sealing bolts Nuts clean, complete rotation nut flexible, threaded parts should be coated with lead powder. 5.2.2.2.10 Stem nut and internal bearings clean, the stem nut and bearing, disc springs with kerosene to clean. Check whether the rotation of the bearing is flexible, whether the disc spring is cracked, defective or should be replaced. 5.2.2.2.11 Stem nut, clean, check the internal and external threaded fasteners are intact, and the housing screws should be solid and reliable. Bushing wear should meet the requirements or should be replaced. 5.2.2.2.12 The bearings coated with butter, set into the stem nut. Disk springs on request. Followed by loading bearing room, and finally lock with a locking nut, and then firmly fixed with screws. 5.2.2.3 gate valve assembly 5.2.2.3.1 grind qualified left and right flap installed in the rake frame, its interior should be placed in the universal roof or horizontal push ring, adjust the gasket according to the trial conditions plus. The assembled shut-off mechanism is connected to the valve stem. 5.2.2.3.2 The valve stem together with the gate into the seat for inspection of Hongdan test. 5.2.2.3.3 The valve body to clean, seat and valve wipe clean. Then the stem together with the gate into the valve seat, and install the valve cover. 5.2.2.3.4 In the bonnet self-sealing parts, according to the requirements to install sealing packing, packing specifications and the number of turns in line with the standard packing upper pressure ring compacting. 5.2.2.3.5 The hexagonal ring in order to install complex, and retaining ring with anti-off, and then closed with a cover, tighten the self-sealing bolts, nuts. Note: There is also a cover and frame structure made of one. 5.2.2.3.6 Filling the packing as required to fill the valve stem packing box, set into the packing gland and the pressure plate, and with the hinge bolt tight, install the valve frame, clockwise rotation of the copper mother, the frame and valve body contact, tight Solid bracket fixing nut. 5.2.2.3.7 Reinstall the valve actuator, the top of the connection wire should be tightened off, manual test valve switch flexible. 5.2.2.3.8 valve signs intact, overhaul record is complete, and experience qualified. 5.2.2.3.9 pipe insulation intact, maintenance site clean. 5.2.2.3.10 The operating personnel shall check the civilized environment of the equipment. After the equipment is repaired, it shall be inspected, preserved and painted well. The fencing, holes and scaffolding shall meet the safety requirements and both parties shall terminate the working ticket. 5.2.2.3.11 When the equipment is under water pressure, it shall be carried out in conjunction with the furnace, and there shall be no seepage of water in the packing. After the valve is closed, there will be no overshoot and leakage of the pipeline. 5.2.3 Self-sealing gate valve overhaul quality standards 5.2.3.1 Stem surface pit depth can not exceed 0.3mm, valve stem curvature of not more than 1/1000 total length, and does not exceed 0. 1mm, non-roundness of not more than 0.05mm . 5.2.3.2 Gland packing and packing room wall gap 0.2 ~ 0.3mm, stem and gland gap 0.1 ~ 0.3mm. 5.2.3.3 Disc and valve seat area of ​​more than 2/3. 5.2.3.4 The hexagonal ring clean, smooth surface. Plane can not have burrs curling. 5.2.3.5 frame and self-sealing bolts Nuts clean, full turn flexible nut, threaded parts coated with lead powder. 5.2.3.6 clean the stem nut and the internal bearing, the stem nut and bearing, disc spring with kerosene to clean. Check the bearing rotation flexible, disk-shaped spring-free crack. 5.2.3.7 Stem nut, clean, check the internal and external threaded fasteners intact, and the housing fixing screws should be solid and reliable. 5.2.3.8 The bearing coated with butter, set into the stem nut. Disk springs on request. Followed by loading bearing room, and finally lock with a locking nut, and then firmly fixed with screws. 5.3 Safety, Health and Environmental Requirements 5.3.1 Safety 5.3.1.1 First check the safety measures and work flow in accordance with the requirements of safety regulations before starting work. 5.3.1.2 Before loosening the valve bolt, check that there is indeed no pressure in the pipe, check if the trap door is opened and the water is released. 5.3.1.3 During the inspection process, the hydrophobic door must be kept open until the valve does not leak out of the wound. 5.3.1.4 When loosening the bolt, take care to prevent it from being sprayed by steam or hot water that may accumulate. 5.3.1.5 After the valve is disassembled, clean the tools and the removed parts, and take protective measures on the removed valve to prevent foreign matter from falling in. 5.3.1.6 In the soda pipe for a longer period of work, the maintenance section of the pipeline should be used tail pipe block will be overhaul of the pipeline section of a reliable cut off. 5.3.1.7 In the installation, the return pipe flange or valve, not allowed to use your fingers into the hole touch. To prevent finger injury. 5.3.1.8 work at heights, wear helmets, wear protective clothing and work shoes, and good care, materials, spare parts, etc. should be placed in a solid and reliable place. 5.3.1.9 emergency elimination must be done to prevent the high temperature valve pipe burns safety measures, such as anti-scald work clothes, gloves, work shoes and so on. 5.3.1.10 The use of electric tools to pay attention to leakage, the risk of electric shock, the use of electric grinding, the risk of iron eye damage; check the power tools to prevent leakage, the use of angle grinders and other power tools to wear protective eyes. 5.3.1.11 Replacing the valve During welding, prevent electric sparks from splashing in the cable tray and cause a fire hazard. 5.3.2 Health 5.3.2.1 In the working environment under the conditions of high temperature work, to do a good measure to prevent stroke. 5.3.2.2 on the workplace near the high-temperature objects, to be well protected from contact with workers on the hot objects. 5.3.2.3 Do not work too hard at work to prevent waist sprain. 5.3.2.4 Use dust masks or qualified masks when removing insulation from pipes or valves. 5.3.2.5 staff entering the pipeline or underground should rotate their work and rest. 5.3.3 Environment 5.3.3.1 Remove the parts to be neatly arranged. 5.3.3.2 valve tight test kerosene used properly put, not directly into the garbage dump or sewer. 5.3.3.3 Pipe or valve for paint work, to be done to prevent paint fall underground or flow to other equipment. 5.3.3.4 After the work is over, it is necessary to clean the work site and ensure the workplace is clean and tidy. 5.3.3.5 work is completed, clean up the site, classified into garbage dumps. 5.4 After-service test items and standards 5.4.1 equipment put into operation before the water pressure with the furnace. Check the packing roots have water seepage, the valve opens check the pipe outlet media out, no media after the closure of the phenomenon of drip, indicating that the valve sealing surface qualified, packing appropriate. 5.4 Maintenance category and overhaul cycle inspection 5.5.1 once a year, the size of a random set of equipment repair 5.5 self-sealing gate valve maintenance 5.5.1 routine maintenance 5.5.1.1 inspection point content 5.5.1.1.1 visual boiler valve Is there any leakage on the sealing surface? B leakage, the components are damaged or not, the visual ear to hear whether the actuator leaks, the implementation of the power leaks. 5.5.1.2 Inspection point standard 5.5.1.2.1 Visual boiler valve sealing surface without? B leakage, parts without damage, the visual ear to listen to the implementing agencies without leakage, the implementation of power without leakage. 5.7 Routine maintenance project in operation, cycle and standard Periodic maintenance project Standard grease 3 months Apply to the stem thread and oil cup Fill appropriate amount RYKon P2 No. 6 furnace circulating pump outlet valve overhaul process specifications 6.1 Circulating water pump Overview of outlet valve and parameters 6.1.1 Overview of outlet valve of water circulation pump 6.1.1.1 A, B valve outlet of boiler water circulation pump 6.1.2 Main performance parameters of outlet valve of water circulation pump 6.1.2.1 Specifications: 300JH63Y320; PN320MPa 6.2 Furnace water circulation pump outlet valve Overhaul procedures, process methods and quality standards 6.2.1 Furnace water pump outlet valve preparation 6.2.1.1 Preparation 6.2.1.2 sure the valve body and connected to the pipeline there is no working pressure. 6.2.1.3 Prepare the work area for disassembly and assembly of the valve so that parts can not be damaged during stacking. 6.2.1.4 prepare the necessary tools and measuring tools. 6.2.2 furnace water circulation pump outlet valve repair steps, process 6.2.2.1 valve disassembly 6.2.2.1.1 The valve frame and the valve body retaining nut removed, rotating the stem, the frame and the door from the pole. 6.2.2.1.2 Remove the upper bearing chamber lock nut fixing screw, unscrew the lock cylinder, remove the bearing and spring washer from the frame. 6.2.2.1.3 Remove the packing gland nut, remove the packing gland and the pressure plate. 6.2.2.1.4 Remove self-sealing six-ring outer ring. 6.2.2.1.5 With the tool will be self-sealing valve cover pressed so that the valve cover and the gap between the six and the ring, and then split off the six-ring. 6.2.2.1.6 Use a lifting tool to lift the valve stem together with the bonnet out of the valve body. 6.2.2.1.7 Remove the flap and the fixed guide. 6.2.2.2 valve inspection and overhaul 6.2.2.2.1 check the valve body wall should be smooth, solid integrity, the valve guide frame may not have jamming phenomenon. 6.2.2.2.2 Check valve stem curvature meets the requirements of its curvature greater than the required standard should be straightened or replaced. 6.2.2.2.3 Clean the stem surface rust, check the surface corrosion is greater than the required standard. 6.2.2.2.4 Check the stem and nut trapezoidal thread, should be no jam, nut rotation flexible. 6.2.2.3 Check the sealing surface 6.2.2.3.1 Check the seat and valve seal surface wear and erosion, 6.2.2.3.2 surface clean, check the weld intact. 6.2.2.4 Check the bearings 6.2.2.4.1 bearings and bushings with kerosene clean, check the bearings should be no rust, cracks and other defects, no abnormal sound rotation. 6.2.2.4.2 Check the connecting bolts and nuts 6.2.2.5 Valve Inspection and Repair 6.2.2.5.1 The sealing surface of the valve is to be ground and the valve flap can be grinded by hand or grinding machine. For example, if the surface has deeper pits and grooves, Or grinding machine for processing, polishing after leveling. 6.2.2.5.2 packing seal replacement, packing seal at the valve cover should be cleaned, self-sealing packing pressure ring to remove rust, and polished clean pressure ring into the valve cover, sealing boss clearance should meet the requirements. 6.2.2.5.3 Stem sealing Packing room should be cleaned, the inner wall polished clean, packing pressure Lan and pressure plate should be removed rust, surface cleaning, pressure Lan bore and stem, the gap between the outer diameter and the packing room should meet the requirements. 6.2.2.5.4 Loose the hinge bolts, check the threaded parts should be intact, nuts intact, can be hand-screwed to the root of the bolt, the pin rotation flexible. 6.2.2.5.5 The seal packing packing stuffing box in order, bystander compaction laxity bolts. 6.2.3 Hearth circulation pump outlet valve overhaul quality standards 6.2.3.1 Stem surface pit depth can not exceed 0.3mm, valve stem curvature of not more than 1/1000 total length, and does not exceed 0. 1mm, non-roundness of not more than 0.05mm . 6.2.3.2 packing gland and packing room wall gap 0.2 ~ 0.3mm, stem and gland gap 0.1 ~ 0.3mm. 6.2.3.3 Disc and valve seat area of ​​more than 2/3. 6.2.3.4 The hexagonal ring clean, smooth surface. Plane can not have burrs curling. 6.2.3.5 frame and self-sealing bolts Nuts clean, complete rotation of the nut flexible, threaded parts coated with lead powder. 6.2.3.6 clean the stem nut and the internal bearing, the stem nut and bearing, disc spring with kerosene to clean. Check the bearing rotation flexible, disk-shaped spring-free crack. 6.2.3.7 Stem nut, clean, check the internal and external threaded fasteners intact, and the housing fixing screws should be solid and reliable. 6.2.3.8 The bearing coated with butter, set into the stem nut. Disk springs on request. Followed by loading bearing room, and finally lock with a locking nut, and then firmly fixed with screws. 6.3 Safety, Health and Environmental Requirements 6.3.1 Safety 6.3.1.1 First check the safety measures and work flow in accordance with the requirements of safety regulations before starting work. 6.3.1.2 Before loosening the valve bolt, check that there is indeed no pressure in the pipe, check if the trap door is opened and the water is released. 6.3.1.3 In the overhaul process, the hydrophobic door must be kept open until the valve leaks out of the wound. 6.3.1.4 When loosening the bolts, care shall be taken to prevent possible injuries caused by the possible accumulation of steam or hot water. 6.3.1.5 After the valve is disassembled, clean the tools and the removed parts, and take protective measures on the disassembled valve to prevent foreign matter from falling in. 6.3.1.6 In the soft water pipeline for a long time work, the repair section of the pipeline should be used to block the tail pipe will be overhaul of the pipe segment. 6.3.1.7 In the installation, the return pipe flange or valve, not allowed to use your fingers into the hole to touch. To prevent finger injury. 6.3.1.8 work at heights, wear helmets, wear protective clothing and work shoes, and good care, materials, spare parts, etc. should be placed in a solid and reliable place. 6.3.1.9 emergency elimination must be done to prevent the high temperature valve pipe burns safety measures, such as anti-scald work clothes, gloves, work shoes and so on. 6.3.1.10 The use of electric tools to pay attention to leakage, the risk of electric shock, the use of electric grinding, the risk of eye damage with iron filings; check the power tools to prevent leakage, the use of angle grinders and other electric tools to wear eye protection. 6.3.1.11 Replacing the valve During welding, prevent electric sparks from splashing in the cable tray causing a fire hazard. 6.3.2 Health 6.3.2.1 In the work environment under the conditions of high temperature work, we must take measures to prevent heat stroke. 6.3.2.2 on the workplace near the high-temperature objects, to be well protected to prevent staff access to hot objects. 6.3.2.3 Do not work too hard at work to prevent waist sprain. 6.3.2.4 Use dust masks or qualified masks when removing insulation from pipes or valves. 6.3.2.5 staff entering the pipeline or underground should rotate work and rest. 6.3.3 Environment 6.3.3.1 Remove the parts to be neatly arranged. 6.3.3.2 valve tight test kerosene used properly put, not directly into the garbage dump or sewer. 6.3.3.3 Pipe or valve for paint work, to be done to prevent paint fall underground or flow to other equipment. 6.3.3.4 After the work is over, clean the work site and keep the workplace clean and tidy. 6.3.3.5 work is completed, clean up the site, classified into garbage dumps. 6.4 after-service test items and standards 6.4.1 equipment put into operation before the water pressure with the furnace. Check the packing roots have water seepage, the valve opens check the pipe outlet media out, no media after the closure of the phenomenon of drip, indicating that the valve sealing surface qualified, packing appropriate. 6.5 Maintenance category and overhaul cycle 6.5.1 Maintenance once a year, the size of a random set of equipment repair 6.6 Furnace water circulation pump outlet valve maintenance 6.6.1 Maintenance in daily operation 6.6.1.1 Inspection point content 6.6.1.1.1 Visual boiler valve Is there any leakage on the sealing surface? B leakage, the components are damaged or not, the visual ear to hear whether the actuator leaks, the implementation of the power leaks. 6.6.1.2 Inspection point standard 6.6.1.2.1 Visual boiler valve sealing surface without? B leakage, parts without damage, the visual ear to listen to the implementing agencies without leakage, the implementation of power without leakage. 6.7. Periodic Maintenance Items, Periods, and Standards in Operation Periodic Maintenance Periodic Standard Grease 3 months Apply to stem threads and grease cup Fill appropriate amount RYKon P2