Abstract: An electromagnetic pressure regulating valve includes a hollow core, a coil surrounding the core and a plunger for applying a load to a valve member through a shaft fitted in the hollow of the core, so that the pressure regulating valve is actuated when an electric signal is fed to the coil. A bushing is mounted in the hollow portion of the core for supporting the shaft for sliding relative to the core and is made of a resin material on at least its sliding face contacting the shaft. An oil passage is provided in the valve for circulating a lubricant to lubricate the areas of sliding contact between the bushing and the shaft.

Abstract: A pressure regulating valve includes a valve body with an input port, an output port and a drain port. A valve member is slidably arranged in the valve body for controlling the fluid communication among the ports and is positioned by an electromagnetic solenoid and a spring, both of which apply loads to the valve member. A spring load setting mechanism is used to move the valve member to a position at which a load according to an input signal to the electromagnetic solenoid, the load of the spring and a feedback pressure are balanced. A supply pressure fed to the input port is thereby regulated and output from the output port. The load setting mechanism includes a receiving plug screwed into the valve body for holding and supporting the spring in a compressed state and a retainer fixed on the valve body for holding the receiving plug against rotation. The receiving plug has an indexed portion at its distal end which is engaged by the restrainer for establishing a rotational position.

Abstract: A linear solenoid valve apparatus includes a linear solenoid housed within a valve body. The linear solenoid valve includes a sleeve with an open channel conduit on its exterior surface, an exhaust port in communication with the open channel in the lower portion of the sleeve, a feedback port, a spool and a spring. The valve body includes a supply passage connecting with the open channel, off center at the top of the sleeve. The structure is designed to prevent the valve from sticking.

Abstract: A linear solenoid valve apparatus includes an electromagnetic valve, a modulator valve with a valve sleeve, valve spool, a spring biasing the spool, a feedback pressure chamber, and an adjusting means provided between the electromagnetic valve and the modulator valve so that the plunger position corresponding to the value of suction power coincides with the spool position.

Abstract: A linear solenoid valve apparatus for discharging foreign matter collected at the exhaust port by engaging the electromagnet of the linear solenoid valve. The apparatus includes a linear solenoid valve having a valve sleeve, a spool, a spring, and an electromagnet, and a modulator valve including an exhaust port in which foreign matter is collected. The electromagnet is energized by foreign matter discharging control, responsive to detection of lack of need for output pressure from the solenoid valve, so that the foreign matter is discharged from the exhaust port.