Direction selector valve having load-sensing function

Details Direction selector valve having load-sensing function Direction selector valve having load-sensing function

1991-06-19

1992-11-10

Michalsky, Gerald A.

Fluid handling

Systems

Supply and exhaust

91446, 91518, 137596, 13762568, F15B 1308

Patent

active

051615754

ABSTRACT:
There is disclosed a direction selector valve having function of detecting load. The valve is used in a hydraulic system. A spool has two passage holes extending axially partially through the spool from both side ends. These two passage holes have their respective high-pressure holes. When the spool is in its neutral position, the high-pressure holes are closed off by spool hole walls between bridge ports and actuator ports. The two passage holes further include low-pressure holes which are in communication with tank ports via load check valves mounted in the passage holes, respectively. Guide holes are formed near the front end of one passage hole and in communication with a load-sensing port. A restriction portion is formed on the outer surface of the spool adjacently to the guide holes to control the flow from the load-sensing port to the tank ports. First guide holes and second guide holes which are close to each other are formed near the front end of the other passage hole. The first guide holes are in communication with the load-sensing port even when the spool is in its neutral position. The second guide holes are placed in communication with the load-sensing port after the spool has shifted from its neutral position, connecting the high-pressure holes with the bridge ports. This structure smoothly responds to the load pressure in the actuator.

REFERENCES:
patent: 3707988 (1973-01-01), Hodgson
patent: 5025625 (1991-06-01), Morikawa
patent: 5038671 (1991-08-01), Ueno

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