Patent ID: 11933424
Assignee: CATERPILLAR INC.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 18:
19. A method of inhibiting leakage of gas in a gas admission valve assembly for controlling the flow of gas in an engine, the method including:
providing a housing including a central bore defining a central axis, an entry chamber disposed about said central axis, at least one gas entry opening that opens into the entry chamber, a gas exit opening that opens into the entry chamber, a valve seat disposed about the gas exit opening, the gas exit opening and the valve seat being concentrically disposed about the central axis;
disposing an elongated valve guide within the central bore, the valve guide having a tubular structure with a central longitudinal bore;
providing a valve including a valve head and a valve stem, and slidably disposing the valve stem within the central longitudinal bore of the elongated valve guide with the valve head disposed to selectively move into and out of contact with the valve seat to selectively provide a flow of gas from the at least one gas entry opening through the entry chamber and to the gas exit opening;
disposing a first stem seal in sealing engagement with the peripheral surface of the valve stem between the valve stem and the central bore of the housing and between a distal end of the valve guide and a retainer to inhibit flow from the entry chamber between the valve stem and the housing;
disposing a biasing element having biasing element proximal end and a biasing element distal end about the valve stem; and
disposing a second sealing element of a second stem seal between the biasing element proximal end and the biasing element distal end in sealing engagement with the peripheral surface of the valve stem at a proximal guide end.