How to use graphite packing? ?

The principle of graphite packing mainly lies in the bearing effect and the labyrinth effect. The bearing effect of graphite packing means that between the graphite packing rail and the bearing, a layer of liquid film will be formed due to the tension, so that the graphite packing and the bearing form a relationship similar to the East China Bearing, so that packing and bearing It will not wear out due to excessive friction. The labyrinth effect of graphite packing refers to the fact that the surface level of the state cannot reach the level of onlookers, and the packing and the bearings can only partially fit and do not fully fit. There is always a very slight difference between the packing and the bearings. In the gap, these gaps form a labyrinth belt in which the medium is throttled several times to achieve sealing.

Installation Procedure 1. Install a packing (packing ring) at a time, making sure that each packing is not covered with dirt or other debris. If necessary, lubricate the packing ring, shaft or stem with a clean lubricant. When multiple rings are used, they must be staggered and the incisions of each packing should be offset by 90 degrees. When installing the ring, it should be slowly pulled in the axial direction. The radial distance can make the ring fit on the shaft. Use a filling tool to fasten each packing ring. When sufficient packing rings are installed, seal them with a follower and use the follower to increase the tightness. The follower only serves as a supplement to ensure the proper position of all packing rings and avoid packing movements.

2. In the reciprocating pump, a guide ring should also be placed at both ends and in the middle of the stuffing box to maintain its concentric motion and the gravity of the plunger.

3. After installing the packing ring, tighten the bolts. In order to obtain uniform pressure on each nut, it is recommended that the nut be tightened with a wrench or related metering device. Please note: If the device is in a non-leakage state, it may cause the burning of the packing. It is recommended to turn on the pump and slowly tighten the bolt until the leakage reaches the allowable range.

4. Rotary and reciprocating pump start 1) Before operation, first run under no load condition, observe whether there is abnormal condition, then drive the car, observe carefully, there is no pressure or inaccurate or too tight and cause serious leakage or burning. Bad filler phenomenon.

2) After installing the packing ring, tighten the bolt and confirm that the cover and packing box face are properly engaged. Once you have tightened the bolts, make sure the bolts are evenly loaded.

3) If an external lubrication system (cooling water flush) is used, be sure it is operating properly before starting.

4) Allow high leakage leakage at start-up. During this process, as long as it is confirmed that the packing is in place and it will work.

5) After about 15-30 minutes of operation, tighten the bolt several times until the leak reaches the recommended range. The recommended flow is 18-30 points/minute.