Many manufacturers have the use of PTFE Gasket case, but the use of the method is correct yet to be verified. PTFE Gasket if used improperly, it will cause gasket leakage, then the PTFE gasket should be how to use it properly?
PTFE Gasket can adjust the formula, change the material composition of the gasket to achieve a variety of media to solve the chemical corrosion of the gasket. This gasket has a high resilience and has a multi-channel seal and a self-tightening function that partially eliminates the effects of pressure, temperature variations and mechanical vibrations.
Non-bonded flange surface for easy maintenance replacement. Can be in the high temperature, low temperature, high vacuum, shock and other cyclical alternating under a variety of harsh conditions, to maintain its excellent sealing performance.
Applicable to the temperature, pressure alternating intense sealing parts, is the pipeline, valves, pumps, heat exchangers, towers, manholes, hand holes and other flange connection of the static sealing components. By changing the tension of the winding strip, the density (hardness) of the wound gasket can be changed to meet the needs of various application sites. It is widely used in petrochemical, mechanical, power, metallurgy, shipbuilding, medicine, atomic and aerospace industries.
Teflon PTFE Gasket seal need to pay attention to the problem:
1, the material of the gasket: soft material because of its pre-tightening force is easy to produce elastic or plastic deformation, thus blocking the leakage of fluid channels, which is conducive to sealing; but soft materials generally can not withstand the role of high-pressure fluid. Gasket corrosion resistance, heat resistance, density and so on have a certain impact on the seal.
2, the temperature of the sealed medium: the temperature of the media fluid directly affect the sealing performance of the pad, so the material must be equal to or higher than the live conditions of temperature: Moreover, the temperature changes will directly affect the sealing performance of the pad , Resulting in a leak.
3, the media fluid: the role of the seal is to seal the media to prevent leakage, in order to better play a sealing effect, we must take into account the medium temperature, pressure, PH value, corrosive and other factors.
4, the size of the sealing surface: the greater the contact between the gasket and the sealing surface width, the media fluid leakage required to pass the longer path, but in the same compression force, the greater the contact width, the seal will reduce the pressure small. Therefore, according to the material of the seal to find the appropriate contact width.
5, the surface of the sealing surface conditions: the shape of the sealing surface and surface roughness of the sealing have a certain impact, the surface is conducive to smooth sealing. The soft gasket is not sensitive to the surface condition due to its ease of deformation, and the surface condition is greatly affected by the hard gasket. The greater the contact width of the sealing surface with the gasket or filler, the longer the path through which the fluid leak passes, and the greater the resistance to flow loss, thus facilitating sealing. But under the same pressing force, the greater the contact width, the seal will be reduced. Therefore, according to the material of the seal to find the appropriate contact width.
6, the impact of external conditions: the vibration of the pipeline system, connecting components of the deformation, the installation location of the offset and other reasons will have additional force on the seal, which has a negative impact on the seal. In particular, vibration, will make the sealing surface between the pressing force of a cyclical change, so that the connection bolt relaxation, resulting in sealing failure. The cause of the vibration may be external, or it may be caused by fluid movement within the system. In order to achieve a good sealing effect, we must seriously consider the above factors.