2) RETURN OIL FILTER BYPASS VALVE RETURN OIL FILTER BYPASS VALVE (1) When the filter is clogged When the filter is clogged Bypass valve (1) is opened and the oil returns directly to the tank without passing through the filter. 1 В Bypass valve set pressure : 1.36 kg/cm 2 (19.3 psi ) From MCV 770-3ATM (6-33) 6-37