Pressure seal gaskets are specifically designed for use with high pressures and high temperatures.
Couplings with autoclave-sealed gaskets offer multiple advantages over classic bolted flanged joints.
Pressure seal gaskets
The autoclave-sealed gaskets
The main one is the significant reduction in the size of the joint, with considerable savings in the materials used.
The principle of operation is simple.
The principle of operation
The trim load of the gasket is provided through the preload flange.
The force generated on the autoclave (bonnet) by the pressure of the fluid inside the equipment will increase the load on the gasket, obtaining the seal at high pressures.
The gasket acts as a self-sealing element, this is the reason why it is very important to manufacture it with materials providing mechanical properties able to withstand the high loads, but at the same time has a high elasticity in order to adapt to pressure variations.
Pressure seals with rectangular or trapezoidal sections, can be made of
- metal material (mild steel, stainless steel, copper, etc.),
- of pre-formed graphite, often with the addition of top and bottom edges in metal having the function of antiextrusion rings.
A / B – relative movement of the autoclave as a function of the internal pressure
C – internal pressure of the fluid
D – load on the seal generated by the internal pressure
Applications
- Autoclave seals find their main application in the construction of shut-off valves for high pressures, where the pressure seal system is preferred to the classic bolted flanged joint with interposed gasket between body and castle.
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