Patent ID: 11933419
Assignee: DANFOSS A/S
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC F

Claim 14:
15. A solenoid valve including a two-stage construction providing reduced power consumption during actuation, the solenoid valve comprising:
(a) a solenoid coil positioned within an outer housing;
(b) a pilot-poppet valve positioned within a pilot housing, the solenoid coil being wound about a portion of the pilot housing to provide a magnetic field for actuating the pilot-poppet valve responsive to an electrical current passing through the solenoid coil, the pilot-poppet valve being movable along an axis for actuating the solenoid valve;
(c) a main-poppet valve including a main chamber, the main chamber defining first and second ports, the main chamber also defining a passage and a main chamber orifice;
(d) a pilot valve seat being positioned between the pilot housing and the main chamber, the pilot valve seat being adapted to isolate the main-poppet valve from the pilot-poppet valve such that the main-poppet valve is movable along the axis independent from the pilot-poppet valve;
(e) a retainer threadedly connected to the pilot housing and the main chamber to provide a first annular seal between the main chamber and the retainer, a second annular seal between the main chamber and the pilot valve seat, and a third annular seal between the pilot valve seat and the pilot housing; and
(f) wherein the passage includes a one-way check valve that allows fluid flow in a first direction from the second port toward the first port and prevent fluid flow in a second direction from the first port toward the second port; and wherein the passage includes a first section and a second section, the first section extending at an oblique angle relative to the axis from the first port to the second section, and the second section extending parallel to the axis from adjacent the pilot valve seat to the first section.