Packing in the pump and valve installation, adjustment methods

The effective sealing of the pump and the valve depends on the overall condition of the individual components, especially the installation and adjustment of the packing. Before installing the packing, make sure that the equipment that needs to be replaced is effectively isolated according to the site and the system. The following is used to guide the maintenance staff, engineers and assemblers to properly install and adjust the packing. 1, the tools needed: the removal of the old packing root need to use a special tool, and pre-tighten the gland nut with a fastener. In addition, regular safety equipment and compliance with applicable safety regulations are required. Prior to installation, first familiarize yourself with the following equipment: Cutter to verify the packing ring, calibrate the torque wrench or wrench, helmet, internal and external calipers, fasteners lubricants, mirrors, pan picker, Tools, vernier caliper and so on. 2, Cleaning and inspection: 1) Slowly loosen gland nuts of stuffing box to release all residual pressure in packing assembly; 2) Remove all old packing and thoroughly clean stuffing box of shaft / rod; 3) Check 4) Check other parts for burrs, cracks, wear, they will reduce the life of the packing; 5) Check the packing box for excessive clearance, and if there is any corrosion, dents, scratches or excessive wear on the shaft / Shaft / rod eccentricity; 6) replacement of parts with larger defects; 7) inspection of the old packing as a basis for failure analysis to find out the causes of early packing failure. 3. Measure and record the diameter of the recording shaft / rod, the diameter and depth of the stuffing box, and record the distance between the bottom of the stuffing box and the top when sealing the water. 4, the choice of packing: 1) to ensure that the selected packing should meet the operating conditions of the system and equipment requirements; 2) According to the measurement record, calculate the packing root cross-sectional area and the number of required packing ring; 3) Root to ensure it is defect-free; 4) Before installation, make sure the equipment and packing are clean. 5, packing ring preparation 1) braided packing in the appropriate size of the shaft winding packing, or use a calibrated packing ring cutter; according to the requirements of neatly cutting the packing into the butt (square) or miter ( 30-45 degrees), cut a ring at a time, and check whether the size with the shaft or stem suitable. 2) Molded packing Make sure that the ring is exactly sized to the shaft or stem, and cut the packing rings if necessary, according to the packing manufacturer's operating instructions or requirements. 6. Install Packing Be careful to install one packing ring each time, enclose each ring around the shaft or stem. Before installing the next ring, make sure the ring is fully seated in the stuffing box and the next ring Should be staggered, at least 90 degrees apart, the general requirements of 120 degrees. After the last ring is installed, tighten the nut by hand and press it down evenly. If there is a water seal, check that it is at the correct distance from the top of the stuffing box. At the same time to ensure that the shaft or stem can rotate freely. 7, adjust the packing: a. Pump with packing (1) continue to hand-tighten the gland nut; (2) after opening the pump, adjust the gland nut, this time allow a little more leakage; (3) Gland nuts, and gradually reduce the leakage until the leakage reaches an acceptable level; (4) If leakage suddenly stops, gland nuts should be re-screwed to readjust to prevent packing overheating; (5) to adjust the leakage rate to a steady state that can. b. Valve Packing Use the packing manufacturer or your company's technical department for torque specifications or percentage compression. Tighten the gland nuts as follows: (1) Apply torque to the gland nuts to 30% of full torque or Party compression percentage;? (2) Repeatedly open and close the valve several times, applying full torque when the valve is in the closed position; and (3) Repeat step (2) 3 or 4 times. 8. Fasten and replace again After a few hours of operation, check the condition of the gland and tighten if necessary. When the gland can not be further adjusted, the packing must be replaced

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