Hydraulic valve

Fluid handling – Self-proportioning or correlating systems – Self-controlled branched flow systems

Reexamination Certificate

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Details

C137S118060, C137S625690

Reexamination Certificate

active

07146998

ABSTRACT:
A stepped down groove53is provided around the peripheral surface of a rod portion43of a spool40which faces a third oil groove33. Both the axial ends53aand53bof the stepped down groove53are located axially outside of both the axial ends33aand33bof the third oil groove33at least while the valve is in pressure-adjusting condition. Also, another stepped down groove52is provided around a land42which faces a first oil groove31. Both the axial ends52aand52bof the stepped down groove52come, respectively, to the right and left sides of the axial end31bof the first oil groove31to which end the spool40shifts to increase the opening of the oil groove at least while the valve is in pressure-adjusting condition.

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