Installation and regulation of pumps and valves with disc roots Practical operation Look at the types of valves from the point of view of application distribution

Installation and regulation of pumps and valves with disc roots Practical operation Look at the types of valves from the point of view of application distribution

Installation and adjustment of pump and valve roots for practical operation Effective sealing of pumps and valves depends on the overall condition of the individual components. Special care should be taken to ensure that the equipment requiring replacement of the roots has been effectively isolated in accordance with the site and system prior to installation of the roots. The following is used to guide maintenance personnel, engineers, and assemblers to properly install and adjust the pan root. 1. The required tools need to be used to remove the old pan root and replace the new pan root with ** tools, and pretighten the gland nut with a fastener. In addition, regular use of standard safety facilities and compliance with relevant safety regulations are required.
Installation and adjustment of pump and valve roots for practical operation Effective sealing of pumps and valves depends on the overall condition of the individual components. Special care should be taken to ensure that the equipment requiring replacement of the roots has been effectively isolated in accordance with the site and system prior to installation of the roots. The following is used to guide maintenance personnel, engineers, and assemblers to properly install and adjust the pan root.
1. The required tools need to be used to remove the old pan root and replace the new pan root with ** tools, and pretighten the gland nut with a fastener. In addition, regular use of standard safety facilities and compliance with relevant safety regulations are required.
Before installation, familiarize yourself with the following equipment: cutting machine for check disk root ring, check torque wrench or wrench, hard hat, inner and outer calipers, lubricant for fastening device, reflector, pan root extractor, pan root cutting tool, vernier calipers, etc.
2. Cleaning and inspection. Slowly loosen the gland nut of the stuffing box, release all residual pressure in the pan root assembly, remove any old pan root, and thoroughly clean the shaft/rod stuffing box; Check shaft/rod for corrosion, dents, scratches or excessive wear; Check whether other parts have burrs, cracks, wear, they will reduce the life of the root; Check whether the stuffing box has too large clearance, and shaft/rod eccentricity; Replace the parts with larger defects; Check the old root as the basis for failure analysis to find the cause of early failure of the root.
3. Measurement and recording. Record shaft/rod diameter, stuffing box aperture and depth, and record the distance from bottom to top of stuffing box when the ring is sealed with water.
4, choose the root. Ensure that the selected root should meet the operating conditions required by the system and equipment; According to the measurement records, calculate the cross-sectional area of the root and the number of root rings required; Inspect the roots to make sure there are no defects; Before installation, ensure that the equipment and roots are clean.
5, the preparation of the root ring.
Braid the roots by winding the roots on a shaft of appropriate size, or using a calibrated root ring cutter; Cleanly CUT DISC ROOTS INTO BUTT (SQUARE) OR MITER (30-45 DEGREES) AS REQUIRED, ONE RING AT a TIME, AND CHECK FOR SIZE WITH SHAFT OR STEM. Mold ROOT TO ENSURE RING SIZE IS ACCURATE TO SHAFT OR STEM, CUT PACKING RING IF NECESSARY ACCORDING TO ROOT MANUFACTURER’S INSTRUCTIONS OR REQUIREMENTS.
6. Install the pan root. Carefully INSTALL THE ROOT RINGS ONE AT A TIME, WRAPPING EACH RING AROUND THE SHAFT OR STEM, ENSURING THAT THE ** RINGS ARE FULLY IN PLACE IN THE STUFFING BOX BEFORE INSTALLING THE NEXT RING, STAGGERED AT LEAST 90 DEGREES APART, 120 DEGREES GENERALLY REQUIRED. After the last ring is installed, tighten the nut by hand and press down evenly on the gland. If there is a water seal ring, it should be checked that the distance from the top of the stuffing box is correct. Also ensure that the shaft or stem can rotate freely.
7, adjust the root.
1) pump with pan root
(1) Continue to tighten the gland nut by hand;
(2) After opening the pump, adjust the gland nut to allow a little more leakage;
(3) Slowly tighten the gland nut to gradually reduce the leakage until the leakage reaches an acceptable level;
(4) If the leakage stops suddenly, the gland nut should be screwed back and adjusted to prevent overheating of the pan;
(5) Adjust the leakage rate to reach a stable state.
2) valve with pan root. Consult the coil manufacturer or the technical department of the enterprise for torque regulations or compression percentages and tighten the gland nut as follows.
(1) Apply torque to the gland nut to 30% of the full torque or party compression percentage; (2) repeatedly open and close the valve several times, when the valve is in the closed position, apply all the torque;
(3) Repeat step (2)3 or 4 times.
8. Tighten and replace again. After several hours of operation, check the regulating condition of the gland and tighten it if necessary. When the gland can not be further adjusted, the coil root must be replaced.
The kinds OF THE valves FROM the point of application distribution look from the Angle of application distribution: HOW MANY KINDS OF URBAN construction SYSTEMS OF THE VALVE ARE GENERALLY USED IN OUR COUNTRY ARE DEVELOPING TO THE environmental PROTECTION AND ENERGY SAVING TYPES. Environmentally friendly rubber plate valve, balance valve and midline butterfly valve, metal seal butterfly valve are gradually replacing the low pressure iron gate valve. The valves needed for domestic urban buildings are balance valves, soft-seal gate valves, butterfly valves and so on. Urban heat generation system, need to use a large number of metal seal butterfly valve, horizontal balance valve and directly buried ball valve, because this kind of valve to solve the problem of longitudinal and transverse hydraulic imbalance, to achieve energy saving, heat generation balance.
From the Angle of application distribution: How many kinds of valve are there in our country?
(1) urban building valves:
Urban construction system with the general use of low pressure valve, the current direction of environmental protection and energy saving. Environmentally friendly rubber plate valve, balance valve and midline butterfly valve, metal seal butterfly valve are gradually replacing the low pressure iron gate valve. The valves needed for domestic urban buildings are balance valves, soft-seal gate valves, butterfly valves and so on.
(2) city heating valve:
Urban heat generation system, need to use a large number of metal seal butterfly valve, horizontal balance valve and directly buried ball valve, because this kind of valve to solve the problem of longitudinal and transverse hydraulic imbalance, to achieve energy saving, heat generation balance.
(3) environmental protection valve:
In the domestic environmental protection system, the water supply system mainly needs the middle-line butterfly valve, soft-seal gate valve, ball valve and exhaust valve (for removing the air in the pipeline). Soft seal gate valve and butterfly valve are mainly used in sewage treatment system.
(4) City gas valve:
City gas accounts for 22% of the whole natural market, the valve dosage is large, its type is also many. The main need ball valve, plug valve, pressure reducing valve, safety valve.
(5) Valves for long-distance transmission pipelines:
Long – distance pipelines are mainly crude oil, finished products and natural pipelines. The MOST FREQUENTLY USED VALVES IN THIS LINE ARE FORGED STEEL THREE-PIECE full BORE BALL VALVES, SULPHur-RESISTANT FLAT GATE VALVES, RELIEF VALVES, AND CHECK VALVES.
(6) Petrochemical plant valve:
A. Oil refining plant. The valves needed by oil refining plant are mostly pipeline valves, mainly gate valves, globe valves, check valves, safety valves, ball valves, butterfly valves and traps. Among them, the demand for gate valves accounts for about 80% of the total number of valves (valves account for 3%-5% of the total investment in the plant).
B, chemical fiber device, chemical fiber products are mainly polyester, acrylic, vinylon three categories. The required valve ball valve, jacket valve (jacket ball valve, jacket gate valve, jacket globe valve).
C, acrylic clear device. The device generally needs to use API scale produced valves, mainly gate valves, globe valves, check valves, ball valves, traps, needle valves, plug valves, among them, gate valves account for about 75% of the total valve.
D. Ammonia plant. Because synthetic ammonia and purification methods are different, the process is different, the technical function of the required valve is also different. At present, the domestic ammonia plant mainly needs gate valve, globe valve, check valve, trap, butterfly valve, ball valve, diaphragm valve, regulating valve, needle valve, safety valve, high temperature and low temperature valve.
Among them, the cut-off valve accounted for 53.4% of the total number of valves used in the device, gate valve accounted for 25.1%, trap accounted for 7.7%, safety valve accounted for 2.4%, regulating valve and from the low temperature valve and other accounted for 11.4%. E, ethylene device, ethylene device is the best device in petrochemical industry, it needs a wide variety of valves.
Gate valves, globe valves, check valves, lifting rod ball valves account for the majority, of which the gate valve should be in the first place. According TO THE “TENTH FIVE-YEAR PLAN”, THE COUNTRY STILL NEEDS TO BUILD 6 SETS OF ETHYLENE UNITS WITH AN ANNUAL OUTPUT OF 660,000 TONS, AND THE demand FOR ITS VALVES is considerable. In addition, large ethylene and high-pressure polyethylene devices also need to use ultra-high temperature, low temperature and ultra-high pressure valve series products. F. Air separation device. “Air separation” means air separation. The device mainly needs cut-off valves, safety valves, check valves, regulating valves, ball valves, butterfly valves and low temperature valves. G, polypropylene device, polypropylene is easy to take propylene as raw material, polymerized polymer compound, the device mainly needs gate valve, globe valve, check valve, needle valve, ball valve, trap valve.
(7) Valve for power station:
For the construction of the power station in China are large-scale direction, so the need of large diameter and high pressure relief valve, pressure reducing valve, cut-off valve, gate valve, butterfly valve, emergency block valve and flow control valve, the spherical seal globe valve, (according to the national “tenth five-year plan, with the exception of Inner Mongolia, guizhou provinces can be built more than 200000 kilowatts units, Other provinces and cities can only build units above 300,000 kilowatts).
(8) Metallurgical valve:
Metallurgical industry aluminum oxide behavior mainly needs to use abrasive slurry valve (in the flow valve), regulating the trap. Metal seal ball valve, butterfly valve and oxidation ball valve, cutoff flash and four-way reversing valve are mainly needed in steel making industry.
(9) ocean flat applicable valve:
With the development of offshore oilfield exploitation, the amount of valves needed for offshore leveling is gradually increasing. Offshore platforms need to shut off ball valves, check valves and multi-way valves.