A check valve is arranged in a flow path through which hydraulic fluid flows. The check valve includes: a cap fixed in the flow path; a plug seated on a seat surface provided in the flow path; a first extension provided in the cap and extending from the cap toward the plug; a second extension provided in the plug, extending from the plug toward the cap, and guided by the first extension; and a spring interposed between the cap and the plug to bias the plug toward the seat surface. The check valve further includes a retainer attached to the cap, extending from the cap toward the plug, and locked to the second (52b).

[Problem] The present invention relates to a hydraulic control unit that includes a pump for increasing a hydraulic pressure of a brake fluid.

[Means for Resolution] The hydraulic control unit according to the present invention includes: a discharge channel from which the brake fluid is discharged, the brake fluid being pressurized by the pump; a pulsation reducing unit disposed in the middle of the discharge channel; and a controller controlling the pump and the pulsation reducing unit. The pulsation reducing unit includes: a valve housing; a fixed core fixed to the valve housing; a movable core received in the valve housing in an axially movable manner; a closing member interlocking with the movable core and closing the discharge channel; a coil disposed in a manner to surround the valve housing and the fixed core; and an inflow chamber which is formed by the valve housing and one end surface of the movable core, into which the brake fluid from the discharge channel flows, and whose volume can vary.

[Problem] The present invention relates to a hydraulic control unit that includes a pump for increasing a hydraulic pressure of a brake fluid.

[Means for Resolution] The hydraulic control unit according to the present invention includes: a discharge channel from which the brake fluid is discharged, the brake fluid being pressurized by the pump; a pulsation reducing unit disposed in the middle of the discharge channel; and a controller controlling the pump and the pulsation reducing unit. The pulsation reducing unit includes: a valve housing; a fixed core fixed to the valve housing; a movable core received in the valve housing in an axially movable manner; a closing member interlocking with the movable core and closing the discharge channel; a coil disposed in a manner to surround the valve housing and the fixed core; and an inflow chamber which is formed by the valve housing and one end surface of the movable core, into which the brake fluid from the discharge channel flows, and whose volume can vary.

Disclosed is a check valve and a modulator block including the same. An embodiment of the present disclosure provides a check valve comprising a valve housing including first and second internal flow passages each formed to pass through an interior of the valve housing and having an inlet through which a fluid is introduced and an outlet through which the fluid is discharged; a first opening and closing member provided in the first internal flow passage and opened and closed by a hydraulic pressure of the fluid; a second opening and closing member provided in the second internal flow passage and opened and closed by the hydraulic pressure of the fluid; and a stopper member press-fitted to the valve housing.

An unloading valve is disclosed. A housing defines a primary and secondary pump inlets, and collective and bypass pump outlets. The housing defines a bypass seat. A tappet has first and second tappet ends longitudinally spaced by a tappet body. The tappet is configured for selective longitudinal reciprocal motion between first and second tappet positions. A tappet shoulder is located on an external surface of the tappet body for selective sealing engagement with the bypass seat to allow fluid flow in a bypass direction and resist fluid flow in a collection direction longitudinally opposite the bypass direction. The primary and secondary pump inlets are in fluid communication with the collective pump outlet for flow in the collection direction when the fluid pressure at the primary and secondary pump inlets combined is below a predetermined bypass pressure and the tappet is located in the first tappet position.

An unloading valve is disclosed. A housing defines a primary and secondary pump inlets, and collective and bypass pump outlets. The housing defines a bypass seat. A tappet has first and second tappet ends longitudinally spaced by a tappet body. The tappet is configured for selective longitudinal reciprocal motion between first and second tappet positions. A tappet shoulder is located on an external surface of the tappet body for selective sealing engagement with the bypass seat to allow fluid flow in a bypass direction and resist fluid flow in a collection direction longitudinally opposite the bypass direction. The primary and secondary pump inlets are in fluid communication with the collective pump outlet for flow in the collection direction when the fluid pressure at the primary and secondary pump inlets combined is below a predetermined bypass pressure and the tappet is located in the first tappet position.

An assembly may be provided that may include a valve body having a piston within a piston bore in the valve body, the piston bore including a valve chamber section and a brake pipe section such that a pressure differential between the valve chamber section and the brake pipe section moves the piston within the piston bore. The assembly may also include a slide valve seat coupled to the valve body. The slide valve seat may include a brake pipe port, an additional discharge channel pilot valve port, and at least one exhaust port, and a slide valve coupled to the piston and configured to move along the slide valve seat with the piston. The slide valve may be configured to move between at least a piloting position and an exhaust position to vary an exhaust rate of the brake pipe section and an exhaust rate of the valve chamber section during braking.

An assembly may be provided that may include a valve body having a piston within a piston bore in the valve body, the piston bore including a valve chamber section and a brake pipe section such that a pressure differential between the valve chamber section and the brake pipe section moves the piston within the piston bore. The assembly may also include a slide valve seat coupled to the valve body. The slide valve seat may include a brake pipe port, an additional discharge channel pilot valve port, and at least one exhaust port, and a slide valve coupled to the piston and configured to move along the slide valve seat with the piston. The slide valve may be configured to move between at least a piloting position and an exhaust position to vary an exhaust rate of the brake pipe section and an exhaust rate of the valve chamber section during braking.

A hydraulic system is provided. The hydraulic system may include a fluid pressure source in fluid communication with a supply line, a return line in fluid communication with a tank, a hydraulic function having a workport, a first control valve having a first proportional solenoid, a second control valve having a second proportional solenoid, and a controller. The controller being configured to selectively energize the first proportional solenoid, the second proportional solenoid, or the first proportional solenoid and the second proportional solenoid to control a system pressure differential, defined between the return line and the workport, within a range that is defined by a sum of a first predefined range defined by the first control valve and a second predefined range defined by the second control valve.

A valve assembly for a braking system having a master cylinder side opening, at least one caliper side opening, and at least one valve pipe, connecting the master cylinder side opening and the caliper side opening. A shutter element has a shutter body movable with respect to the valve body. When the shutter body is in a valve closing position, it interrupts a at least one main fluid passage and defines a master cylinder side pipe stretch facing a master cylinder side opening and a caliper side pipe stretch facing a caliper side opening in the valve pipe. The shutter body at least partially delimits at least one secondary fluid passage, so that, when the shutter body is in a valve closing position, the master cylinder side pipe stretch is in fluid communication with the caliper side pipe stretch only through the secondary fluid passage.