Expanded PTFE valve stem packing using polytetrafluoroethylene fine powder as material, a kind of soft products using new technology into processing. White, continuous rope, a round cross section. It has the flexibility of height, excellent filling property, self lubrication, low friction coefficient, corrosion resistance and other properties. It is the advent of, will make frequent replacement of valve packing time gone.
Technical parameters
Use temperature of -260 ~ +260
Use pressure < 20MPa
- applicable medium except fluoride molten alkali metal elements, all chemical substances.
Advantage
Load fast and easy. At the time of filling generally does not have to remove the valve, just put the rope around the valve stem packing into the stuffing box, a letter, tighten the cap, the filler can be pressed into a whole dense.
And excellent sealing performance. Expansion of unique micro structure of PTFE give the product good flexibility and moldability, so that it can easily be the stuffing inside the void, even the stem, letter on the body all the pits and grooves in packing, this also makes the old valve corrosion, wear and avoid the replacement or repair.
And long service life. Because of its long held soft plastic, the leakage  be packing, but also because it is not corrosion, not aging, can be long-term use.
And the valve opening and closing flexible. Because PTFE has the lowest friction coefficient and excellent self-lubricating property.
Do not contaminate the fluid in the pipeline. Because it is white and clean, not due to corrosion and aging and fall off, so that it is particularly applicable to the pharmaceutical, fine chemical, food industry etc..
And specifications good versatility, reduce packing storage, save money. Just as the stem packing solid preparation of several thickness specification, can meet most of the demand valve. Generally choose to hand embedded in the maximum number of the filler, but relatively thin, 'the kind of packing, also can be used for the specifications of the valve, after pressing, also plastic molding, get dense filling body. Types and specifications
Expanded PTFE sealing belt is a kind of peculiar sealing material with unique processing technology made the. It is PTFE products, 100% of the quality of soft, can be arbitrary deflection, has excellent compression resilience, good flexibility, high compressibility, excellent corrosion resistance, aging resistance, creep resistance, low friction coefficient and high tensile strength, a section of arbitrary length tape, paste in the sealing surface (itself with glue) as long as the two ends are connected and overlapped to form the fork, a sealing gasket, sealing material all kinds of pipe fittings and mechanical equipment flange extremely ideal.
The use of temperature
-268 ~260 OC
The pressure range
Hydraulic 200 (kgf/cm2)
The pressure of the 140 (kgf/cm2)
Thickness
0.5mm-10mm
Width
3mm--100mm
Density
0.7 g/cm3~0.8 g/cm3
PH
0~14
Chemical stability is extremely reliable. In addition to the element fluorine, molten alkali metals, high temperature under high pressure and its effect, and the whole of freon-12 hydrocarbon the slight swelling (swelling does not affect the seal), showed no reaction with all of the other chemicals.
Expanded polytetrafluoroethylene seal tape is a very novel sealing material with unique processing technology made the. It is a continuous band of white pure PTFE products, has good flexibility, compression elasticity, creep resistance, high temperature resistance and excellent corrosion resistance, aging resistance, self lubricity. Sealing performance, convenient installation, is the ideal sealing material chemical, pharmaceutical, petrochemical, food and beverage, electronics, electric power, metallurgy, shipbuilding and other industries.
Applicable medium except fluoride molten alkali metal elements, all chemical substances.
Technical parameters:
Use: -168 to +280 DEG C temperature
PH value: 0 ~ 14
Use pressure: < 5 MPa (liquid) <2MPa (gas)
Smith: of 0.7 (+ 0.05) g/ cm3
The use of sealing belt:
Seal, all kinds of enamel lining, lining, glass, rubber lining, plastic lining graphite lining and  steel, titanium steel tower, heat exchanger, such as reactor flange.
Various pipes and pipe fittings, flange sealing.
And the surface machining accuracy is poor, irregular area is larger, irregular in shape, flange bolt fastening force is not easy to big caliber equipment used by foot or not sealed.
And strong corrosion medium and can not be any contamination of the fluid sealing.