Useful seals for pumps and valves depend on the overall condition of each component, especially the graphite disc device and conditioning. Before the winding device, firmly believe that the need for more graphite winding equipment has been in accordance with the site and system for useful isolation. The following instructions are used to guide maintenance personnel, engineers, and assemblers to properly install and adjust disk roots.
1. What you need: special things need to be used when taking off the old disc root and replacing it with the new one, as well as pre-tightening the gland nut with the fastener. In addition, regular use of safety facilities and compliance with relevant safety regulations are required. Before the graphite disc device, the first thing to be familiar with the following equipment: check disc ring cutting startup, check torque wrench or wrench, helmet graphite disc, internal and external calipers, fastening lubricant, reflector, disc removal device, cutting graphite disc, vernier caliper, etc.
2. Clean and view:
(1) Slowly loosen the gland nut of the stuffing box to release all remaining pressure in the disc root assembly
(2) Remove all the old disc roots and completely clean the stuffing box of the shaft/rod
(3) Check whether the shaft/rod has corrosion, dents, scratches or excessive wear;
(4) to see whether other parts have burrs, cracks, wear, they will reduce the number of graphite disc longevity graphite disc;
(5) Check whether there is too much gap in the stuffing box, and the degree of bias of the shaft/bar;
(6) Replacement of parts with major defects;
(7) Check the old disc root as the basis for failure analysis to find the cause of early failure of disc root.
3. Measure and record the diameter of the shaft/rod, the diameter and depth of the stuffing box, and record the distance from the bottom to the top of the stuffing box when the ring is sealed with water.
4, select the root:
(1) The graphite disc ensures that the selected disc root should be satisfied with the operating conditions required by the system and equipment;
(2) According to the measurement records, calculate the cross-sectional area of graphite disc root and the number of required disc root rings;
(3) Check the disc root to ensure that it has no defects
(4) Before the installation, ensure that the equipment and disc root clean.
5. Preparation of the root ring:
(1) braided disc graphite disc graphite disc around the disc on the appropriate scale axis, or the use of calibrated disc ring cutting boot; According to the requirements, cut the disc root cleanly into butt (square) or miter (30-45 degrees), cut one ring at a time, and check the size with the shaft or valve stem.
(2) The size of the die pressed disc root guarantee ring is precisely coordinated with the shaft or valve stem. If necessary, the packing ring is cut according to the operation strategy or requirements of the disc root manufacturer.
6. The device graphite disc is carefully installed one disc ring each time, and each ring is around the shaft or valve stem. Before the device next ring, it should be ensured that the ring has been completely in place in the stuffing box, and the next ring should be staggered, at least 90 degrees apart, and 120 degrees is generally required. After the top ring is installed, tighten the nut by hand and press the gland evenly. If there is a water seal ring, it should be checked to see if the distance from the top of the stuffing box is correct. Together to ensure that the shaft or stem can roll freely.
Post time: Feb-09-2023