Solenoid operated pressure control valve
This patent describes a solenoid actuated fluid pressure control valve. It includes a housing having a central passage extending vertically downwardly from a first port adapted to be connected to a fluid sump and located at the upper end of the housing to a second port adapted to be connected to a source of fluid pressure and located adjacent the lower end of the housing, a solenoid coil mounted within the housing intermediate the upper and lower ends thereof in coaxial relationship with the central passage, an elongate tubular valve body sealingly seated in the central passage with the upper end of the valve body projecting above the lower end of the coil and the lower end of the body located above the second port, a flow passage extending through the valve body from a lower downwardly facing frusto conical valve seat opening into the central passage at the lower end of the body to an upper upwardly facing valve seat at the upper end of the body opening into the central passage at the upper end of the body, means defining a third port in the housing in constant fluid communication with the flow passage at a location between the upper valve seat and the lower valve seat, a ball located in the flow passage between and the lower valve seat and the second port operable when seated against the lower valve seat to block fluid communication between the second port and that portion of the flow passage above the lower valve seat, a solenoid armature received in the central passage between the upper valve seat and the first port and having means at its lower end operable when engaged with the upper valve seat to block fluid communication between the flow passage and that portion of the central passage above the upper valve seat.
- Assignee:
- Coltec Industries Inc., New York, NY (USA)
- Patent Number(s):
- US 4998559; A
- Application Number:
- PPN: US 7-471709
- OSTI ID:
- 5345554
- Resource Relation:
- Patent File Date: 29 Jan 1990
- Country of Publication:
- United States
- Language:
- English
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