Two-way flow control solenoid with an auto pressure regulating feature
A solenoid valve is provided having a hydraulic body that provides one of the poles for the solenoid valve. The hydraulic body has a central bore providing a bearing surface for an armature having an integral poppet. The poppet seals with a valve seat integral to the hydraulic body.
1. A solenoid valve comprising:
a ferromagnetic casing;
a coil positioned within said casing;
a ferromagnetic hydraulic body positioned within said coil, said body having a central bore with an axial bearing surface with first and second ports and an integral conical valve seat between said ports, said body providing a flux return of said solenoid;
an armature slidably mounted within said central bore having an outer diameter surface in contact with said body central bore and being aligned thereby, said armature having an integral conical poppet with a sealing ratio greater than 0.95, an angle of said poppet being shallower than an angle of said valve seat, said armature having a through passage exposing an axial face of said armature generally opposite said body first port to hydraulic pressure of said body first port; and
a spring biasing said poppet of said armature to prevent flow from said body second port to said body first port until energization of said coil.
2. A solenoid valve as described in claim 1 wherein said first port is at an axial extreme of said body and wherein said second port is at a cross bore of said housing body.
3. A solenoid valve as described in claim 1 wherein said body provides a flux choke.
4. A solenoid valve as described in claim 1 where said body provides a direct magnetic contact with said casing.
5. A solenoid valve as described in claim 1 wherein said body has an exterior flange ring.
6. A solenoid valve as described in claim 1 wherein said body has a permanent magnet positioned within said first port.
7. A solenoid valve as described in claim 1 wherein said body has a third port between said first port and said valve seat with a check valve installed therein.
8. A solenoid valve as described in claim 1 wherein said armature has a spiral vent within said through passage.
9. A solenoid valve as described in claim 1 wherein said armature has a pressure energized sealing said armature with said body between said second port and said opposite face of said armature.
10. A solenoid valve as described in claim 9 wherein said armature has a cross bore intersecting said central passage and an outer diameter of said armature between said armature axial face and said pressure energized sealing of said armature to maximize a pressure differential across said pressure energized seal.
11. A solenoid valve as described in claim 1 wherein said solenoid valve further includes a pole piece positioned within said body generally adjacent an extreme end of said body.
12. A solenoid valve as described in claim 1 wherein said body has direct magnetic contact with said casing via a radial contact and an axial contact.
13. A solenoid valve comprising:
a casing having a generally closed end and generally cylindrical side ends;
a coil positioned within said casing;
a ferromagnetic hydraulic body positioned within said coil having axial and radial direct magnetic contact with said casing, said body having a multiple diameter central bore with a bearing surface and a first axial port and a second side port and a conical seat positioned between said first and second ports, and said body having a third port between said first port and said conical seat, said third port having a check valve therein and wherein said body having an integrally connected flux return member separated from a portion of said body by a flux choke;
a pole piece generally positioned in said body adjacent an extreme end of said body
an armature slidaby mounted within said central bore of said body having an outer diameter surface in contact with said bearing surface of said housing, said armature having an integral poppet with a conical angle shallower than said angle of said conical seat and wherein said poppet has a sealing ratio greater than 0.95 and wherein said armature has a through bore exposing an axial face of said armature generally opposite said first port to hydraulic pressure of said first port and wherein said armature has a sealing member between said axial face and said second port; and
a spring biasing said armature poppet toward said valve seat.
14. A solenoid valve comprising:
a ferromagnetic casing;
a coil positioned within said casing;
a ferromagnetic hydraulic body positioned within said coil, said body having a central bore with an axial bearing surface with first and second ports and an integral seat between said ports, said body providing a flux return of said solenoid;
an armature slidably mounted within said central bore having an outer diameter surface in contact with said body central bore and being aligned thereby, said armature having an integral poppet with a sealing ratio greater than 0.95, said armature having a through passage exposing an axial face of said armature generally opposite said body first port to hydraulic pressure of said body first port, and wherein said armature has a spiral vent within said through passage; and
a spring biasing said poppet of said armature to prevent flow from said body second port to said body first port until energization of said coil.
15. A solenoid valve as described in claim 14 wherein said valve seat is conical.
16. A solenoid valve as described in claim 15 wherein said armature poppet is conical and wherein an angle of said poppet is shallower than an angle of said valve seat.
17. A solenoid valve as described in claim 14 wherein said body has a permanent magnet positioned within said first port.
18. A solenoid valve as described in claim 14 wherein said body has a third port between said first port and said valve seat with a check valve installed therein.
19. A solenoid valve as described in claim 14 wherein said armature has a pressure energized sealing said armature with said body between said second port and said opposite face of said armature.
20. A solenoid valve as described in claim 14 wherein said armature has a cross bore intersecting said central passage and an outer diameter of said armature between said armature axial face and said pressure energized sealing of said armature to maximize a pressure differential across said pressure energized seal.