PTFE, PFA, FEP, PVDF Fluoroplastic products industry experts
Classification of PTFE gaskets and classification of PTFE seals
Classification:
Industry dynamics
Author:
PFA tube little sister
Source:
Dankai
Release time:
2022-11-16
Visits:
Classification of PTFE gasket:
PTFE gasket is a good gasket sealing material, is a polymer compound made of tetrafluoroethylene polymerization, can be used in any kind of chemical medium for a long time. Reliable sealing performance, which is
In its main material PTFE itself has the best corrosion resistance and not aging, after special processing has a good creep resistance and cold flow resistance, electrical insulation and anti-sticking.
Expanded gasket: high sealing pad made of polytetrafluoroethylene puffed, does not contain any adhesives and additives, especially excellent gas sealing performance.
Modified gasket: the use of inorganic filler, it is evenly dissolved into the PTFE raw material after deep processing, not easy to aging, can be stored for a long time.
Coated gasket: It is a non-metallic composite soft gasket, which is composed of a coated cover and an insert. It is suitable for flat or protruding surface steel pipe flange connection tooth-shaped corrugated composite gasket: metal gasket is processed into V
Concentric rings of shaped teeth or waves can form many line contacts with differential pressure spaces with the flange surface, so the seal is reliable and the service cycle is long.
Wound gasket: PTFE wound gasket is a kind of semi-metal flat gasket made of V-shaped or W-shaped thin steel strip and filler PTFE spiral composite winding.
Figure 1: PTFE gasket Source: Dankai
basic knowledge of seals:
The function of the seal is to prevent leakage, that is, to seal the gap between the joint surfaces, increase the resistance in the leakage channel, or add small work components in the channel to cause pressure on the leakage and cause leakage.
The differential pressure is partially offset or fully balanced to prevent leakage.
PTFE sealing ring has chemical, heat resistance, cold resistance, acid resistance, oil resistance, non-stick, corrosion resistance, wear resistance, electrical insulation, weather resistance, etc. is better than any plastic now, it does not
Easy to aging, non-burning, non-polar molecular structure, used as a gasket, the contact surface can be smooth and smooth, non-adhesive to metal, resistant to a variety of acids, alkalis, salts, greases and other media corrosion.
The cost of sealing is very small, and the cost of leakage is very large. Common sealing gaskets, packing seals, sheathing gaskets, mechanical seals, shaft sleeves, etc.
Classification of PTFE seals:
Leakage is one of the common failures of mechanical equipment, mainly in two aspects:
1. Due to the existence of various defects and shape and size deviations on the surface of machined products, gaps are inevitably generated at the joints.
2. There is a pressure difference on both sides of the seal, and the working medium leaks through the gap.
Classification of seals:
1 Static seal
Low pressure static seal: commonly used material is soft, wide gasket pad seal.
② high pressure static seal: commonly used material is hard, narrow contact width of the metal gasket.
2 Dynamic seal
Contact seal: good sealing, limited by friction, suitable for low speed occasions.
Non-contact sealing: poor sealing, suitable for high speed occasions.
PTFE seals, good sealing, safe and reliable, long life, and should strive for compact structure, simple system, convenient manufacturing and maintenance, large temperature range differences and so on.
This article is originally created by Teflon's little sister. Welcome to pay attention and take you to grow knowledge together!
Key words:
PTFE, gasket, seal, seal, with, chemical, heat resistance, acid resistance, electrical insulation
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