A hydraulic control system for vehicles is provided. A switching valve (34) that is adapted to provide a communication between an electric oil pump (25) and a drain passage while inhibiting a delivery of the oil from the electric oil pump (25) to the control object (20, C) when an output pressure of the mechanical oil pump (9) is higher than a predetermined level, and to provide a communication between the electric oil pump (25) and the control object (20, C) through a predetermined oil passage when an output pressure of the mechanical oil pump (9) is lower than the predetermined level. The electric oil pump (25) discharges oil before establishing the communication between the electric oil pump (25) and the control object (20, C) as a result of reduction in the output pressure of the mechanical oil pump (9) to be lower than the predetermined level.

An instrument reprocessor for cleaning, disinfecting, and/or sterilizing a medical instrument is disclosed. To reprocess instruments having one or more channels defined therein, the reprocessor can include one or more flow control systems configured to control a flow of fluid through each channel. A flow control system can include a differential pressure sensor and a proportional valve for controlling the fluid flow in a channel. The reprocessor can also include a fluid circulation pump which can be configured to supply the flow control systems with fluid and a system for controlling the pressure of the fluid supplied to the flow control systems. The reprocessor can also include a system for supplying a metered amount of fluid to the fluid circulation system. The system can include a reservoir having a fluid height sensor to monitor the amount of fluid therein and a pump configured to supply the reservoir with fluid.

A hydraulic pressure supply system of an automatic transmission for a vehicle may include a low-pressure hydraulic pump, a low-pressure regulator valve, a high-pressure hydraulic pump, a high-pressure regulator valve regulating the high hydraulic pressure supplied from the high-pressure hydraulic pump to be stable hydraulic pressure and supplying the regulated hydraulic pressure to the high pressure portion, a first switch valve disposed between the low-pressure hydraulic pump and the low-pressure regulator valve, and selectively communicating the low-pressure hydraulic pump to the low-pressure regulator valve, a second switch valve selectively opening or closing a first circulating line connecting a downstream of the low-pressure hydraulic pump to an upstream of the high-pressure regulator valve, and a third switch valve selectively opening or closing a second circulating line connecting a downstream of the high-pressure regulator valve to an upstream of the low-pressure regulator valve.