Abstract: In order to facilitate release of a filter by-pass valve (10) for filter element replacement in relatively inaccessible locations, the valve (10) includes a housing (12) defining a filter chamber (14) having an inlet (16) communicating with the filter chamber (14) at one end (18) of the housing (12) and an outlet (20) communicating with the filter chamber (14) at the other end (22) of the housing (12). An integral filter-valve assembly (24) is removably positionable within the housing (12) between the inlet (16) and outlet (20). The filter-valve asssembly (24) supports a filter element (26) within the filter chamber (14) in a manner defining a primary flow path from the inlet (16), through the filter element (26), and to the outlet (20). The filter-valve assembly (24) also includes a by-pass valve (28) defining a secondary flow path from the inlet (16) to the outlet (20).

Abstract: The age old problem of monitoring a liquid level in a reservoir has continued to cause problems. If the level is too low, the component will malfunction due to lack of lubricant; on the other hand, if the level is too high, the component can overheat. The present system overcomes the problem of the level being too high by providing an automatic vent for draining excess liquid from the reservoir. When the engine is in the nonoperating mode, the spring moves the spool of the valve to the open position. In the open position, excess liquid is vented from the reservoir establishing the predetermined liquid level. When the engine is operating, a portion of the air from the compressor enters the chamber forcing the spool to the closed position preventing liquid from being vented from the reservoir. In the closed position, contaminants are also prevented from entering the reservoir.