Abstract: A solenoid controlled valve comprises a spool. One end side of the spool is slidably inserted into a first fluid chamber of a sleeve in a fluid tight condition. The other end of the spool is loosely inserted into a second fluid chamber. The spool with a stationary orifice is provided in an inlet path extending in axial direction. A spring for urging the spool and a movable core fixed to the spool, and a coil are provided. When electric current is supplied to the coil, the movable core is attracted against the spring force and the spool moves opposite to the urging direction of the spring, so that the external peripheral face of the spool closes the first port and the second port.

Abstract: An anti-skid control apparatus includes a fluid pressure control valve positioned between a master cylinder and a wheel cylinder of each wheel. The fluid pressure control valve controls the wheel pressure cylinder. A reservoir is provided for temporarily storing brake fluid expelled from the wheel cylinder during an anti-skid control. A pumpless fluid pressure control device is also provided for circulating brake fluid stored in the reservoir back to a master cylinder without using a pump. A flow control valve for maintaining a constant flow of brake fluid is positioned between the master cylinder and the wheel cylinder.

Abstract: A brake fluid pressure control device which is simple in structure and inexpensive, which has the functions as both an antilock controller and a traction controller, and which is capable of automatically increasing braking pressure with pumps while the driver is treading the brake pedal. Shutoff valves serving as fluid sources for pumps are provided in a fluid circulation type antilock control device. When the brake pedal is treaden, the shutoff valves close under the master cylinder pressure. While the shutoff valves are closed, no fluid can be supplied to the pump. But in this state, changeover valves open, so that fluid can be supplied from the master cylinder to the pumps through the changeover valves. Check valves are further provided to prevent the fluid supplied to the pumps from flowing into dumped fluid reservoirs.