Panplug, the word comes from the transliteration of “Variseal”, is the meaning of composite seal, combined seal, usually refers to the spring energy storage seal, is spring variseal (spring composite seal) shorthand.
“Pan plug” itself is the transliteration of “composite seal”, so there is no need to add the word “seal” behind the “pan plug”, if in accordance with the customary name, plus the word is also OK. Of course, according to the Chinese directly say “spring storage seal” is better.
The picture on the right shows the typical structure of the flooding plug, which is divided into two different parts inside and outside. The external sealing body is a special functional plastic, and the internal is a stainless steel spring of special materials.
The material of the seal body and the spring are different due to different working conditions and working media. In general, the material of the seal body is: pure tetrafluoroethylene, filled tetrafluoroethylene, ultra-high molecular weight polyethylene, polyimide, polyether ether ketone and so on. The material of stainless steel spring is generally SUS301,SUS304,SUS316 and SUS718.
The external seal body is in contact with the two surfaces to be sealed and plays a sealing role, so it requires low friction coefficient, high strength, wear resistance, working medium resistance, and high or low temperature working environment.
The internal stainless steel spring provides pressure for the external seal body, so that the seal lip has been tightly pressed on the sealing contact surface, to prevent leakage, especially when the internal pressure is low, zero pressure or even negative pressure, the spring is the only source of sealing pressure. The requirements for the spring are simple: resistance to high and low temperatures in the environment, corrosion resistance, and relatively constant elastic force. Although these requirements are not much, they are not easy to achieve, and the material, process and shape of the spring are highly required.
Pan plug and Glay ring, Sterseal and other combined seals, make full use of the superior performance of each component material, so that the overall performance is far beyond any single material seal. Compared with the previous various forms of seals, it has both significant advantages and obvious defects.