Aramid packing process and installation process

As an integral part of the function of the various components of the aramid packing, Kevlar packing in the specific installation, adjustment package, pump and valve effective sealing. To replace the previously installed PTFE packing, it is necessary to pack the cotton packing in the specified position, which is believed to effectively isolate the system equipment. The following are used to perform maintenance personnel, engineers and technicians to properly install and customize packages.

1, the necessary tools: A new package removed from the old packaging Kevlar packing requires special tools and nut fasteners preloaded to replace cotton yarn packing. In addition, frequently used standard safety equipment and compliance with relevant safety requirements. Before installation, especially familiar with yourself has the following characteristics: cutting ring knife, calibration torque wrench or wrench, protective helmet, inner and outer calipers, bolts, lubricants, mirrors, removal of packaging, packaging tools, caliper calibration packaging.

2, cleaning and inspection:

a) Slowly release the gland nut and release the residual pressure of all packaged components;

2) Remove all old packaging and thoroughly clean the shaft/rod stuffing box;

3) Check for corrosion, dents, scratches or excessively worn shafts/rods;

4) Check other parts of the ridge, cracks, wear, reduce the packaging of life;

5) Check the stuffing box, if there is a big gap, eccentric shaft / rod;

6) Larger defects in the exchange;

7) Check, see the old package, error analysis based on the reasons for premature failure of the package.

3. Measure the diameter of the recording shaft/rod, the depth of the aperture and stuffing box, and the water seal ring, recording the bottom of the padding from the bottom.

4 Packing:

1) Ensure that optional packages must meet system and equipment requirements to meet operating conditions;

2) Based on the investigation records, the calculated cross-sectional area and seals required for packaging;

3) testing and packaging to ensure its shortcomings;

4) Determine the cleanliness of the installed equipment and packaging.

5, seal ring manufacturing 1) Wrap the packing in the appropriate size for the shaft wound, or use a calibrated packing ring knife, ask to cut the butt (square) or beveled (30-45 degrees), cut the cleaning package a ring, with the shaft or The scale of the spindle test is appropriate.

2) In order to mold the package to ensure the size of the ring and the shaft or precisely, if necessary, the manufacturer's instructions are followed by packing or cutting the seal ring.

Carefully install the package each time to install a seal ring, each ring around the stem or stem, before the ring is installed, ensure that the ring is fully in place in the gland, and the lower ring should be at least 90 degrees of displacement that is 120 degrees of overall requirement. The first ring, manual installation, tighten the nut, gland, and even pressure. If the water seal, you should check the distance from the top of the stuffing box is correct. At the same time, to ensure that the shaft can rotate freely.

7 packages:

One. Pump and packaging (1) Continue to tighten the nut by hand;

(2) Pump, adjust the gland nut to allow more leakage;

(3) Slowly tighten the screw nut to gradually reduce leakage to an acceptable level until leaking;

(4) If the transmission is suddenly stopped, the nuts should be tightened and re-adjusted to prevent overheating of the package;

Can (5) adjust the leak rate from a steady state.

. b. Use the following steps for the valve to use the packaging, the torque or compression ratio specified by the packaging manufacturer or the company's technical department, tighten the nuts:

(1) The union nut full torque or 30% compression ratio of the torque;

(2) When the valve is repeatedly opened and closed and torque is applied repeatedly, the valve is in the closed position;

(3) Repeat step (2) 3 or 4 times.

8, replace and re-tighten the operating state, after a few hours, check the supervision of the gland, tightening needs, must be replaced, the gland is not to further adjust the package