Air turbine starters having oil feed shutoff valves and gas turbine engines including the same

An Air Turbine Starter (ATS) configured to be installed within a gas turbine engine containing an Accessory Gearbox (AGB), the ATS comprising:

• an ATS housing assembly having a sump chamber, an oil inlet, and a valve cavity fluidly coupled between the sump chamber and the oil inlet;
• a rejected oil return passage formed in the ATS housing assembly and fluidly coupled to the valve cavity;
• an oil feed shutoff valve positioned in the valve cavity, the oil feed shutoff valve comprising:
• a valve element movable between:
• (i) an open position in which the valve element permits oil flow from the oil inlet, through the valve cavity, and into the sump chamber, and (ii) a closed position in which valve element blocks oil flow from the oil inlet into the sump chamber, while redirecting the oil flow into the rejected oil return passage;
• a piston fixedly coupled to the valve element;
• a control pressure chamber at least partially defined by the piston and the valve cavity, the control pressure chamber containing a first pressure urging movement of the valve element toward the open position;
• and
• a reference pressure chamber at least partially defined by the piston and the valve cavity, the reference pressure chamber containing a second pressure urging movement of the valve element toward the closed position;
• and
• a reference pressure duct formed in the ATS housing and fluidly coupling the reference pressure chamber to the AGB when the ATS is installed within the gas turbine engine.

An Air Turbine Starter (ATS) configured to be installed within an engine cavity, the ATS comprising:

• an ATS housing assembly containing a sump chamber and an oil inlet;
• a valve cavity fluidly coupled between the sump chamber and the oil inlet;
• a circumferential groove extending at least partially around the valve cavity;
• an oil feed shutoff valve positioned in the valve cavity and containing a valve element having an annular sidewall, the oil feed shutoff valve movable between open and closed positions in which the annular sidewall uncovers and covers the circumferential groove, respectively, to selectively obstruct oil flow from the oil inlet, through the circumferential groove, and into the sump chamber;
• and
• a rejected oil return passage fluidly coupled to the circumferential groove, the rejected oil return passage redirecting oil received at the oil inlet back to the engine cavity when the valve element is in the closed position.