the internal diaphragm or SPST contacts have likely failed

and Sterling units

Sleeve Bearing Design: Optimized for vertical shaft-up or shaft-down outdoor applications with quiet

effectively reducing noise and operational vibration compared to generic alternatives

York 022-09577-000 Valve Stop 321702-401 the internal diaphragm or SPSTThe York 022 09577 000 Valve Stop is a high precision 7 16 inch refrigerant shutoff valve engineered for critical isolation in commercial HVAC systems and centrifugal liquid chillers. Designed as a vertical angle stop, this OEM York replacement part provides technicians with a reliable manual point of control for regulating refrigerant flow, specifically within high capacity units like the York Millennium YCJF series. Its 7 16" x 1 2" configuration