초록 ▼

A flow control valve (20) has a needle valve (76) for controlling flow between an inlet adapted to be connected to a source of pressure and an outlet adapted to be connected to an operating device whose operation is dependent upon the position of the needle valve; the needle valve is positioned by a

A flow control valve (20) has a needle valve (76) for controlling flow between an inlet adapted to be connected to a source of pressure and an outlet adapted to be connected to an operating device whose operation is dependent upon the position of the needle valve; the needle valve is positioned by an armature (60) magnetically attracted by a solenoid coil (18); the armature is pressure equalized by two pins (72, 74) acting on the opposite ends (60a, 60b) of the armature and by a bypass tube (90) for supplying source pressure to each pin such that the control position of the valve is unaffected by changes in the pressure and is dependent solely upon the average current flow through the solenoid coil.

대표청구항 ▼

A pressure control valve having a valve housing (30) supporting an armature (60) for movement therein and including a pressure inlet port (46) adapted to be connected to a high pressure source defining a system pressure (26) and including an outlet port (50a) adapted to be connected to a device (24)

A pressure control valve having a valve housing (30) supporting an armature (60) for movement therein and including a pressure inlet port (46) adapted to be connected to a high pressure source defining a system pressure (26) and including an outlet port (50a) adapted to be connected to a device (24) whose operation is controlled in accordance with the output pressure of the valve, a solenoid coil (18) for positioning the armature relative to the valve housing and a needle valve (76) having a valve pin (74) producing a back pressure force on the armature during regulation of the output pressure from the valve in accordance with the energization level of said solenoid coil characterized by: spring means (110) for biasing said armature in a first predetermined direction to either maintain said needle valve in a normally open position or a normally closed position; said armature having an outlet pressure reaction surface (60a) and pressure balancing reaction surface (60b), said back pressure force of said needle valve pin acting on said outlet pressure reaction surface during regulation of the pressure at said outlet port; and pressure balance means (70) for controlling the position of said needle valve solely in response to the average current flow to said solenoid coil and for maintaining the adjusted position of said needle valve as set by said average current regardless of changes in the system pressure.