If a first control valve 71 is arranged so as to change between a flow position A and a throttling position C by a fluid for switching purpose guided through a pilot channel 77, the flow area of a first intermediate channel can be changed in two steps. As a result, the injection-valve opening pressure...http://www.google.es/patents/US5992148?utm_source=gb-gplus-sharePatente US5992148 - Relief mechanism and hydraulic circuit equipped with relief mechanism
Relief mechanism and hydraulic circuit equipped with relief mechanism
