Regulating Valve for an Oil System

A regulating valve for an oil system of a gas turbine engine, the regulating valve comprising:

• a housing forming a valve inlet and a valve outlet;
• a piston disposed within the housing, the piston including a plug portion and a piston sidewall portion, the plug portion disposed on a valve axis of the regulating valve at the valve inlet, the piston sidewall portion extending circumferentially about the valve axis, the piston sidewall portion including an inner radial piston side surrounding and forming a first cavity;
• a spring disk disposed at the inner radial piston side, the spring disk extending between and to a first axial disk end and a second axial disk end, the first axial disk end further forming the first cavity, and the spring disk is axially translatable relative to piston;
• an outer cover forming a second cavity axially between the outer cover and the second axial disk end;
• a plunger connected to the outer cover, and the plunger is disposed within the second cavity;
• a first spring disposed within the first cavity, the first spring extending axially between and contacts the first axial disk end and the plug portion;
• and
• a second spring disposed within the second cavity, the second spring extending axially between and contacting the second axial disk end and the outer cover;
• and
• the piston is positionable in a first axial position, a second axial position, and a third axial position within the housing to sequentially increase a variable flow area at the valve inlet, in the first axial position the plug portion obstructs oil flow from the valve inlet to the valve outlet and the spring disk is axially spaced from the plunger, in the second axial position the spring disk contacts the plunger, and in the third axial position the piston contacts the outer cover.

An oil system for a gas turbine engine, the oil system comprising:

• an oil pump including a pump inlet and a pump outlet;
• and
• a regulating valve including a valve inlet and a valve outlet, the valve inlet connected in fluid communication with the oil pump at the pump outlet, and the valve outlet connected in fluid communication with the oil pump at the pump inlet, the regulating valve extending along a valve axis, the regulating valve including:
• a housing forming the valve inlet and the valve outlet;
• a piston disposed within the housing, the piston including a plug portion and a piston sidewall portion, the plug portion disposed at the valve inlet, the piston sidewall portion extending circumferentially about the valve axis, the piston sidewall portion including an inner radial piston side surrounding and forming a first cavity;
• a spring disk disposed at the inner radial piston side, the spring disk extending between and to a first axial disk end and a second axial disk end, the first axial disk end further forming the first cavity;
• an outer cover forming a second cavity axially between the outer cover and the second axial disk end;
• a plunger disposed at the outer cover, the plunger extending along the valve axis between and to a first axial plunger end and a second axial plunger end, the first axial plunger end disposed within the second cavity;
• a first spring disposed within the first cavity, the first spring extending axially between and contacting the first axial disk end and the plug portion;
• and
• a second spring disposed within the second cavity, the second spring extending axially between and contacting the second axial disk end and the outer cover.