The AP Racing shuttle valve is able to collect two different hydraulic inflows in a single output. The output pressure will be equal to the higher of the two pressures input. Is commonly used to separate the hydraulic handbrake circuit from that to pedal.
Important: To operate properly the pump of the hand brake and the pedal must be fed from the same tank. When the pressure is produced by a single pump, the valve loses 6 bar pressure in about 10 minutes, for this reason should not be used for parking.