Pressure regulator for hydraulically controlled machine tools
AssigneeIndex-Werke Komm.-Ges. Hahn & Tessky
InventorDietmar F. Hafla
Life of this patent
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Abstract
A pressure regulator for hydraulically controlled machine tools comprises a first directly controlled three-way pressure-regulating valve with which required work pressure can be set by a machine control system. In addition to a first surface, the control spool is provided with a second surface to which hydraulic fluid under the pressure at the pressure port can be applied by means of an externally controllable valve. This results in an additional force acting upon the control spool in the direction opposite to, or in the direction of, the force exerted by the elastic element on the control spool.
Claims32
A pressure regulator for hydraulically controlled machine tools comprising:
- a first directly controlled three-way pressure-regulating valve with a housing including an inflow, an outflow and a pressure port for a hydraulic fluid, and with a control spool mounted therein which is movable back and forth between a first position connecting the inflow with the pressure port, a second position closing the pressure port and a third position connecting the pressure port with the outflow, with a constant pressure being settable at the pressure port, on the one hand, by a force being applied to the control spool by a biased elastic element in the direction of the position connecting the inflow with the pressure port, and, on the other hand, by the control spool having a first surface to which hydraulic fluid under the pressure at the pressure port is applied, by means of which a force counteracting the force of the elastic element acts upon the control spool, the control spool provided with a second surface to which the hydraulic fluid under the pressure at the pressure port can be applied by means of an externally controllable valve and, when applied, results in an additional force acting upon the control spool in the direction opposite to the force of the elastic element.
A pressure regulator for hydraulically controlled machine tools comprising:
- a first directly controlled three-way pressure-regulating valve with a housing including an inflow, an outflow and a pressure port for a hydraulic fluid, and with a control spool mounted therein which is movable back and forth between a first position connecting the inflow with the pressure port, a second position closing the pressure port and a third position connecting the pressure port with the outflow, with a constant pressure being settable at the pressure port, on the one hand, by a force being applied to the control spool by a biased elastic element in the direction of the position connecting the inflow with the pressure port, and, on the other hand, by the control spool having a first surface to which hydraulic fluid under the pressure at the pressure port is applied, by means of which a force counteracting the force of the elastic element acts upon the control spool, the control spool provided with a second surface to which the hydraulic fluid under the pressure at the pressure port can be applied by means of an externally controllable valve and, when applied, results in an additional force acting upon the control spool in the direction of the force of the elastic element.
Dependencies are inferred from the claim text.