Fluid handling – Systems – Supply and exhaust
Reexamination Certificate
1999-06-18
2001-01-09
Michalsky, Gerald A. (Department: 3753)
Fluid handling
Systems
Supply and exhaust
C137S884000
Reexamination Certificate
active
06170520
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a pressure control valve for use with a solenoid valve aggregate having a plurality of solenoid valves arranged side by side in a line, and a solenoid valve assembly equipped with the same.
PRIOR ART
In fluid pressure equipment, there are cases wherein a fluid pressure supplied to the fluid pressure equipment is required to be adjusted according to a set pressure or an operating condition of the equipment. To adjust the supplied fluid pressure, it is necessary to install a pressure control valve such as a pressure reducing valve in a pipe through which a pressure fluid is supplied or discharged to or from the fluid pressure equipment.
However, it would require a large installation space and increase cost to install pressure control valves as necessary in the pipes of many solenoid valves in a solenoid valve aggregate in order to supply a pressure fluid to respective parts of the fluid pressure equipment by the solenoid valve aggregate having a plurality of solenoid valves arranged side by side in a line. Further, if a fluid of the same pressure is supplied to a plurality of parts of the fluid pressure equipment via a plurality of pressure control valves, then overlapping equipment would occupy an installation space, resulting in a disadvantage costwise.
DISCLOSURE OF THE INVENTION
A basic technological object of the present invention is to provide a pressure control valve that can be placed between a solenoid valve aggregate, which has a plurality of solenoid valves arranged side by side in a line, and a supply-exhaust block for supplying and discharging a pressure fluid to them, or to provide a solenoid valve assembly that incorporates the pressure control valve.
A specific technological object of the present invention is to provide a pressure control valve that permits a supply-exhaust block and a solenoid valve aggregate, which have conventionally been employed, to be used as they are and that can be used by being placed therebetween so as to make it possible to supply a pressure fluid, the pressure of which has been reduced, from the respective solenoid valves constituting the solenoid valve aggregate.
Another technological object of the present invention is to provide a pressure control valve that allows a different secondary pressure required in fluid pressure equipment to be supplied for each set of a plurality of sets of solenoid valve aggregates by a simple means, or to provide a solenoid valve assembly that incorporates the pressure control valve.
To fulfill the objects, according to the present invention, there is provided a pressure control valve for a solenoid valve aggregate, the pressure control valve being a pressure control valve for supplying a pressure fluid, the pressure of which has been adjusted, to a supply passage in a solenoid valve aggregate that has the supply passage and a discharge passage installed through a plurality of solenoid valves arranged side by side in a line. The body of the control valve placed between a supply-exhaust block, which has a supply port through which a pressure fluid is supplied from the outside and an exhaust port to the outside, and the solenoid valve aggregate is provided with an input port in communication with the supply port of the supply-exhaust block, an output port in communication with the supply passage installed through the solenoid valve aggregate, a pressure regulating mechanism that regulates the pressure of the pressure fluid supplied through the supply port of the supply-exhaust block and outputs a secondary pressure to the supply passage of the solenoid valve aggregate through the output port, and an exhaust passage that provides direct communication between the discharge passage of the solenoid valve aggregate and the exhaust port of the supply-exhaust block.
Further, a solenoid valve assembly in accordance with the present invention is provided with a solenoid valve aggregate that has a plurality of solenoid valves arranged side by side in a line and a supply passage and a discharge passage installed therethrough, the pressure control valve that supplies a pressure fluid, the pressure of which has been regulated, through the supply passage, a supply-exhaust block that has a supply port through which a pressure fluid is supplied from the outside and an exhaust port to the outside, and a coupling means for coupling the solenoid valve aggregate, the pressure control valve, and the supply-exhaust block arranged side by side in a line.
In the solenoid valve assembly, a plurality of sets of the solenoid valve aggregates, the pressure control valves, and the supply-exhaust blocks are coupled by a single coupling means. A plurality of sets of solenoid valve aggregates having different fluid pressures to be output can be incorporated in a single solenoid valve assembly.
Further, a pressure regulating mechanism in the pressure control valve may be constructed such that a valve hole is provided in the body of the control valve in parallel to the surface of junction to the solenoid valve aggregate, a pressure regulating valve rod is slidably inserted in the valve hole, the pressure regulating valve rod is equipped with a valve member that moves into contact with or away from a valve seat provided at the valve hole so as to open or close the passage between the input port and the output port, and both ends of the pressure regulating valve rod are provided with valve rod urging means for setting the opening of the valve seat by the valve member according to the force of action based on a fluid pressure at the output port and an urging force of a pressure regulating spring that sets a secondary pressure and for regulating the secondary pressure to a set value by the pressure regulating spring.
The pressure control value for the solenoid valve aggregate having the configuration set forth above is placed between a supply-exhaust block that has a supply port for a pressure fluid from the outside and an exhaust port to the outside and the solenoid valve aggregate having a plurality of juxtaposed solenoid valves, and used as a solenoid valve assembly. In this solenoid valve assembly, the pressure fluid supplied through the supply port of the supply-exhaust block is introduced into the pressure regulating mechanism from the input port in the control valve body, reduced in pressure to a predetermined secondary pressure set by the pressure regulating spring, sent to the respective solenoid valves through the supply passage of the solenoid valve aggregate from the output port, and sent from the solenoid valves to respective actuators in fluid pressure equipment. The exhaust from the fluid pressure equipment is performed from the exhaust passage of the solenoid valve aggregate through the exhaust path of the control valve body and the exhaust port of the supply-exhaust block.
Thus, since the pressure control valve is used by being provided between the supply-exhaust block and the solenoid valve aggregate having a plurality of juxtaposed solenoid valves, a supply-exhaust block and a solenoid valve aggregate that have been hitherto employed can be used as they are to constitute the solenoid valve aggregate that supplies a pressure air, which has been reduced in pressure. Moreover, a plurality of sets of the supply-exhaust blocks, the pressure control valves, and the solenoid valve aggregates can be coupled by a single coupling means to set different secondary pressure at the pressure control valve for each set of the solenoid valve aggregate, thereby providing various fluid pressures required in the fluid pressure equipment. This achieves a markedly simpler configuration compared with a case wherein the pressure control valve is provided in the passage of each solenoid valve.
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patent: 1 259 662 (1968-01-01),
Hayashi Bunya
Ishikawa Makoto
Narita Masaru
Michalsky Gerald A.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
SMC Corporation
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