What Is Packing, You Know?

The root, also known as sealing filler, is usually woven from a softer linear, usually with a square or rectangular, round strip filled in the sealed cavity. This enables sealing. Filler sealing is first used to plug in cotton and other fibers in the leak channel to prevent fluid flow leakage, mainly used as a shaft seal of water lifting machinery. Because of the wide range of sources of fillers, easy to process, low price, reliable sealing, simple operation, so the use of so far. Today, the coil is widely used in centrifugal pumps, compressors, vacuum pumps, mixers and ship propellers for hinge seals, piston pumps, reciprocating compressors, refrigeration machine sipulations shaft seals, as well as various valve stem rotary seals.

Weaving plate root is woven by expanded graphite wire, often used in addition to strong oxidants in most occasions, can be used in boiling water, high temperature, high pressure steam, heat exchange medium, oil, acid, alkali, hydrogen, ammonia, organic solvents, hydrocarbons, cryogenic liquids and other media. It is a unique new type of sealing root.

Root technical requirements:

(1) When cutting the root of the plate, it is best to wrap the coil on the same diameter as the valve stem on the round steel rod cut to ensure that the size is correct, the cut parallel. The incision should be rounded and free of loose asbestos head. The incision is best at an angle of 45 degrees.

(2) Each coil should be pressed separately into the tray root box. When pressing the valve root, place a small amount of scaly dry graphite or lubricant between each turn.

(3) In order to facilitate installation, when pressing aluminum foil encapsulation asbestos plate root, should be coated with a thin layer of oil-adjusted squamous graphite powder on the inner edge of the coil.

(4) Choose the width of the root, should be the same size as the root box, or large 1 to 2 mm.

(5) When pressing oil soaked in asbestos plate root, the first and last lap is best pressed dry asbestos plate root, so as to prevent oil from seeping out.

(6) When pressing the root of the disk, the interface of the coil ring must be staggered, the general interface is staggered 120 degrees or 180 degrees;

(7) The depth of the cap pressed into the tray root box, generally the height of a circle of the root, but not less than 5, and should leave room for further tightening.

(8) When installing the press cap, the gap between the coil and the stem should be consistent, to prevent bias, so that the coil force is uneven and wear out quickly. Generally should keep the clearance not greater than 0.1 to 0.15.

(9) The key points to ensure the installation quality of the root are: selected right, checked finely (check the stem, the plate root box, the coil, etc.)