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Opening Pressure Adjustment

To adjust opening pressure, change shim thickness. Thicker shims will increase opening pressure; thinner shims will decrease it. Shims are available in thicknesses from .040-.077" (1.00-1.95 mm) in increments of .002" (.05 mm). A .002" (.05 mm) shim will increase opening pressure by approximately 71 psi (5 kg/cm² ). See Figure .