Weak current College】 【pump and valve packing of installation and adjustment --- Power By】 【China power house network.

<br> Pump and valve for effective sealing depends on the individual components of the overall situation, with particular attention to packing before installation, that need to be replaced packing equipment already in accordance with the site and system for efficient isolation. The following are used .to guide the maintenance personnel, engineers and fitters properly installed and adjusted packing. <br> <br> 1, need tools to remove the old packing new packing required special tools, and fastening with preload gland nut. In addition, the need to frequently .used standard safety facilities and to comply with the relevant safety requirements. <br> <br> Before installation, first familiarize yourself with the following devices: Verify packing rings cutting machine, checking torque wrench or wrench, helmet, inside and outside calipers, fastening .for lubricants, mirrors, packing out, cut up root cutter, Vernier caliper, etc. <br> <br> 2, cleaning and inspection. Slowly release the stuffing of the gland nut, freeing up the root component in all residual pressure, remove .all old packing, thoroughly clean the shaft / Rod stuffing; check whether there is axial / pipe corrosion, dents, scratches or excessive wear, check the other parts are there Burr, cracks, wear, they will reduce packing of life; check stuffing for .large gaps, as well as the eccentric shaft / Rod; replace parts and components of larger defects;: check the old packing, as failure analysis, to find the root cause of premature failure. <br> <br> 3. measuring and recording .. Record axis / Rod diameter, Aperture and depth of the stuffing box, and then use the seal ring, record the stuffing the distance from the bottom to the top. <br> <br> 4. Select the packing. Make sure that the .chosen disk root system and equipment shall meet the requirements of the operation condition; according to the survey record, calculation of packing of cross-sectional area and the required quantity of packing ring; inspection and packing, make sure that it is free of defects; .before installation, make sure that the equipment and packing clean. <br> <br> 5. packing ring. Braided packings in the appropriate size of the axis winding up root, or using the calibration before packing ring cutter; upon request, cleanly cut .packing into butt (square) or miter (30-45 degrees), once cut a ring and shaft or stem inspection dimensions are appropriate. <br> <br> Compression molding packing, make sure that the dimensions of the ring and shaft or stem .accurate alignment, when necessary, according to the packing manufacturer's operating instructions or requirements cutting packing ring. <br> <br> 6, Setup disk root. Carefully each time you install a packing rings, each ring around the axis or the stem, the .next ring is installed, you should ensure that the ring is completely in the stuffing in place, the next should be staggered arrangement, at least at 90 °, 120 ° General requirements. Most previous loop installed, hand tighten the nut, capping even under .pressure. If the seal ring, you should check it and the distance at the top of the stuffing box is correct. At the same time ensure that shaft or stem can rotate freely. <br> <br> 7. adjust the packing. < .br> <br> 1) pump with packing <br> <br> (1) continue to hand-tighten gland nut; <br> <br> (2) pump, adjust the gland nut, which allowed a little more leakage; .<br> <br> (3) slowly tighten gland nut, gradually reduce leakage until leaks reached an acceptable level; <br> <br> (4) if the disclosure should suddenly stop, back to remove the gland nut, adjustment to prevent .overheating of packing; <br> <br> (5) Regulation leakage rate reaches a steady state. <br> <br> 2) valve packing. To packing manufacturer or enterprise technology sector advisory for torque requirements or compression percentage, follow these steps .to tighten gland nut. <br> <br> (1) to the gland nut torque applied to the full torque of 30% or the percentage of compression; <br> <br> (2) repeatedly opening and closing number of times, .when the valve valve in the off position, the torque exerted all; <br> <br> (3) repeat steps (2) 3 or 4 times. <br> <br> 8. fastening and replace again. In a few hours .after the operation, check the status of regulated pressure CAP, if necessary, tighten them, when the cover cannot be further adjusted, you must replace the packing..