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.
Axial Face Seal
Rotary Barrier
A mechanical barrier designed to prevent fluid leakage along a rotating shaft relies on continuous contact between two flat surfaces oriented perpendicular to the axis of rotation. This configuration, known as an axial face seal, prevents process fluids from entering the dry sensor chamber or housing.
Contact Interface
The boundary between the stationary and rotating rings requires precise flat surfaces to maintain a thin fluid film that lubricates the contact area. In an axial face seal, this film must remain thick enough to prevent excessive wear but thin enough to restrict leakage to imperceptible levels. Wear of these faces leads to a gradual increase in fluid bypass and eventual component failure.
Pressure Performance
High-pressure differentials across the sealing boundary can distort the mating rings and alter the gap geometry. Solid performance depends on balancing the spring load with the hydraulic forces acting on the ring faces. If the force becomes unbalanced, the axial face seal can experience increased friction, rising temperatures, and accelerated material degradation.
Metrological Interference
The mechanical drag generated by rubbing surfaces introduces friction torque that can affect the sensitivity of rotational torque sensors. Fluctuations in the contact force of the axial face seal create parasitic forces that must be compensated for during low-torque calibration procedures. Engineers minimize this interference by choosing low-friction face materials such as silicon carbide or diamond-like carbon, which provide consistent drag characteristics over a wide temperature range and reduce calibration drift.