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

Claim 12:
13. A hydraulic valve comprising:
an outer valve housing piece including an exterior threaded portion for securing the hydraulic valve within a valve manifold;
a solenoid assembly including a solenoid coil contained within a solenoid housing;
a valve cage coupled to the outer valve housing piece, the valve cage including an axial port positioned along an axis that extends through the solenoid coil, the valve cage also defining a side port;
a pilot-poppet valve seat positioned within the outer valve housing piece, the pilot-poppet valve seat and the valve cage being mechanically secured relative to each other such that relative movement between the pilot-poppet valve seat and the valve cage along the axis is prevented, the pilot-poppet valve seat defining a pilot port, and the pilot- poppet valve seat defining first and second opposite sides;
a pilot-poppet positioned at the second side of the pilot-poppet valve seat, the pilot-poppet being movable relative to the pilot-poppet valve seat along the axis between a first position and a second position, wherein the pilot port is open when the pilot-poppet is in the first position, and wherein the pilot-poppet closes the pilot port when in the second position;
a pilot-poppet spring that biases the pilot-poppet in a first axial direction toward the first position, and wherein the pilot-poppet is driven in a second axial direction toward the second position when the solenoid coil is energized;
a main-poppet positioned at the first side of the pilot-poppet valve seat, the main- poppet being mechanically isolated from the pilot-poppet by the pilot-poppet valve seat, the main-poppet being positioned within the valve cage and being movable along the axis between a closed position and an open position, wherein when the main-poppet is in the closed position, the main-poppet engages a main valve seat defined by the valve cage to prevent direct fluid communication between the axial port and the side port, and wherein when the main-poppet is in the open position, the main-poppet is displaced from the main valve seat to allow direct fluid communication between the axial port and the side port;
a main-poppet spring captured between the pilot-poppet valve seat and the main- poppet for biasing the main-poppet toward the closed position; and
a main-poppet chamber defined between the main-poppet and the pilot-poppet valve seat, the main-poppet including a chamber pressurization orifice that provides fluid communication between the side port and the main-poppet chamber;
wherein when the pilot-poppet is in the first position and the pressure is higher at the side port than the axial port, the pilot-poppet is in the open position such that the main poppet chamber is not pressurized and flow will pass through the main-poppet to the axial port;
wherein when the pilot-poppet is in the second position and the pressure is higher at the side port than the axial port, the pilot-poppet moves to the second position in which the main-poppet is in the closed position, and wherein the main-poppet pressurizes to hold the main-poppet in a closed position such that fluid communication from the side port to the axial port is blocked;
wherein the hydraulic valve further comprises a core tube that extends through the solenoid coil along the axis, and a passage that includes at least a portion drilled through the valve cage; and
wherein the portion includes a first section and a second section, the first section extending at an oblique angle relative to the axis from the axial port to the second section, and the second section extending parallel to the axis from adjacent the pilot-poppet valve seat to the first section.