Port Geometry and Gasket Seating on a Pressure Part
Controlled gland squeeze between 15% and 25% prevents mechanical die stress while isolating the pressure port against long-term fluid leakage.
Elastomer Compression
Elastic Deformation
The physical displacement of a rubberlike material under an applied load creates a stored energy state that exerts a continuous force against the confining surfaces. In sealing applications, elastomer compression is the primary mechanism used to fill surface irregularities and prevent fluid bypass.
Sealing Force
The magnitude of the force exerted by the deformed seal depends on both the material hardness and the depth of the groove. When elastomer compression is inadequate, the seal fails to conform to the machined surfaces, leading to micro-leakage. Conversely, excessive squeezing can cause physical damage, such as extrusion or cracking, which compromises the integrity of the enclosure.
Material Limitation
Polymer networks exhibit time-dependent relaxation when held under a constant strain for extended periods. This phenomenon causes elastomer compression to decrease over time, a behaviour that is accelerated at elevated temperatures. Metrologists must account for this decline when evaluating the long-term reliability of pressure-tight instruments.
Sensor Performance
The stress fields generated by a compressed seal can propagate through the sensor housing and induce mechanical strain on sensitive transducers. When elastomer compression varies due to thermal expansion, it creates a temperature-dependent offset in silicon pressure sensors. Technicians isolate the sensor element from these mounting forces to ensure that the measured values represent the true process pressure rather than seal-induced stress.