Pumps and Valves Installation and Adjustment of Packing Actually, the effective sealing of pumps and valves depends on the overall condition of each component. Pay special attention to the fact that before packing installation, the equipment that needs to replace the packing has been validated on site and system Isolated. The following is used to guide the maintenance staff, engineers and assemblers to properly install and adjust the packing. 1, the tools needed in the removal of the old packing root need to use a special tool, and with the fastener pre-gland nut. 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. Slowly loosen the gland nut of the stuffing box to release any residual pressure in the packing assembly, remove any old packing and thoroughly clean the shaft / rod stuffing box; check shaft / rod for corrosion, dents, scratches Or excessive wear; Check other parts for burrs, cracks, wear, they will reduce the life of the packing; Check the packing box for excessive clearance and shaft / rod eccentricity; Replace larger defects of parts; : Check the old packing root as a basis for failure analysis to find out the reasons for the early failure of the packing. 3, measurement and recording. Record shaft / rod diameter, stuffing box aperture and depth, and at the time of sealing with water, record the distance from the bottom to the top of the stuffing box. 4, choose packing. Make sure that the chosen packing should meet the operating conditions required by the system and the equipment. Calculate the packing cross-sectional area and the number of packing rings required based on the measurement records. Check the packing to ensure it is defect-free. Before installation, ensure Equipment and packing clean. 5, packing ring preparation. Braided packing Winding the packing on a suitably dimensioned shaft or using a calibrated packing ring cutter; cutting the packing neatly into pairs (square) or miter (30-45 degrees) on request, cutting one at a time Ring, and with the shaft or stem to check the size is appropriate. Molded packing, to ensure that the ring size and shaft or stem with the precise fit, if necessary, according to the packing manufacturer's operating guidelines or requirements cutting ring. 6, installation packing. Carefully install a packing ring at a time, placing each ring around a 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. 1) Pump packing (1) Continue to hand tighten the gland nut; (2) After adjusting the gland nut after opening the pump, allow a little more leakage; (3) Slowly tighten the gland nut Leakage until the leak to an acceptable level; (4) If the leakage suddenly stopped, gland nuts should be re-screwed to readjust to prevent packing overheating; (5) to adjust the leakage rate to a steady state. 2) valve packing. Consult the packing manufacturer or your company's technical department for torque ratings or percentage compression. Tighten the gland nuts as follows. (1) Apply torque to gland nuts to 30% of full torque or percentage of party compression; (2) Repeatedly open and close the valve several times and apply full torque when the valve is in the closed position; (3) Repeat step ) 3 or 4 times. 8, fastening and replacement again. After a few hours of operation, check the adjustment of the gland and tighten if necessary. When the gland can not be further adjusted, the packing must be replaced.