초록 ▼

A rotary control valve includes a directional control valve having a rotatable valve element for controlling the direction of fluid flow from an input passage to a pair of control ports and from the control ports to a drain passage. A pressure regulating valve is connected to a source of pilot press

A rotary control valve includes a directional control valve having a rotatable valve element for controlling the direction of fluid flow from an input passage to a pair of control ports and from the control ports to a drain passage. A pressure regulating valve is connected to a source of pilot pressure and has a valve spool for controlling the regulated pressure level of pilot fluid in the input passage. A cam is connected to the valve element for unitary rotation therewith. A spring and a plunger are disposed between the valve spool and the cam so that the valve spool is mechanically moved in a rectilinear direction by the cam in either direction from a neutral position to increase the level of the regulated pressure in the input passage proportional to the degree of rotation of the rotatable valve element.

대표청구항 ▼

[ We claim:] [1.] A rotary control valve device comprising:a directional control valve having an input passage and first and second control ports, a valve element having a neutral position and being rotatable in a first direction therefrom to communicate the input passage with the first control pass

[ We claim:] [1.] A rotary control valve device comprising:a directional control valve having an input passage and first and second control ports, a valve element having a neutral position and being rotatable in a first direction therefrom to communicate the input passage with the first control passage and in a second direction therefrom to communicate the input passage with the second control passage;a pressure regulating valve connectable to a source of pilot fluid and having an outlet communicating with the input passage of the directional control valve and a valve spool movable in response to pressurized fluid at the outlet thereof in a first rectilinear direction to regulate the pressure level in the outlet of the pressure regulating valve; andmeans for mechanically imparting the rectilinear movement to the valve spool of the pressure regulating valve in a second, opposite direction in response to rotary movement in either direction from the neutral position of the valve element of the directional control valve.