SE356797

1277938 Reciprocating motors or pumps VON ROLL A G 3 Dec 1969 [5 Dec 1968] 59124/69 Heading F1A The valve surface engaged by the rotary cylinder block of an axial or radial-piston motor or pump has a fluid bearing surface 12 formed with recesses 13 connected by grooves 14, and supplied with hydraulic fluid from the highpressure port 10 or 11 of the pump or motor. The recesses are supplied via one or two bores 15 connected to a groove 14, as shown, or to a recess 13, Fig.3 3 (not shown). Each bore 15 is mounted to a respective port 10, 11 via a spring- loaded check-valve and a throttled passage, the valve preventing return flow to the port 10 or 11, Fig. 1 (not shown). An annular groove 8 has discharge openings 9.