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US 5,295,663 AGranted
Pressure control valve
AssigneeMannesmann Rexroth GmbH
InventorsGotz-Dieter Machat, Eugen Ebert, Hans Wolfges
Life of this patent
Estimating the term…
Abstract
A pressure control valve is provided comprising an inlet bore, an annular channel and a control spool. So as to obtain a low control deviation and good stability an annular channel is provided at the outlet side of the valve. The axial extension of said annular channel is smaller than the outlet flow area formed by said bores.
Claims22
A pressure control valve comprising:
- a sleeve (25),
- an inlet flow bore (12), axially extending in said sleeve,
- a plurality of outlet flow bores (26) radially extending in said sleeve,
- a spool (16) having a constant outer diameter, axially reciprocally mounted in said sleeve (25), acting as a control element, said spool having a spool edge (40) adapted to be moved through a control range,
- an annular channel (27) provided in said sleeve (25) between said inlet flow bore (12) and said outlet flow bores (26), said annular channel (27) having a width (b2) and a diameter (d2), said diameter (d2) being larger than the diameter of said inlet flow bore,
- a stepless transition area provided in said control range within said sleeve between the inlet flow bore (12) and a starting inclination (31) of the annular channel, said outlet flow bores form top ends and, opposite thereto, bottom ends and are arranged across a part of said annular channel such that a zone (43) remains which is free of the annular channel, and wherein the bottom ends are located in the area of said starting inclination (31).
3 more elements
A pressure control valve comprising:
- a sleeve (25),
- an axially extending inlet flow bore (12) as well as a plurality of radially extending outlet flow bores (26) provided in said sleeve, and
- a spool (16) having a constant outer diameter and mounted in an axially movable manner in said sleeve (25) and acting as a control element and comprising a spool edge (40) adapted to be moved through a control range,
- an annular channel having a width (b2) being provided in said sleeve (25) between said inlet flow bore (12) and said outlet flow bores (26) wherein the width (b2) of the annular channel (27) is smaller than the diameter (d3) of said outlet flow bores (26),
- an annular channel starting inclination (31) being formed by said annular channel, and
- a conical valve seat surface defining a stepless transition area provided in said control range within said sleeve between the inlet flow bore (12) and the starting inclination (31), the outlet flow bores forming top ends and, opposite thereto, bottom ends and being arranged across a part of said annular channel such that a zone (43) remains which is free of the annular channel, and wherein the bottom ends are located in the area of said starting inclination (31).
3 more elements
Dependencies are inferred from the claim text.