Fluid handling – Convertible – Reversible check
Reexamination Certificate
2000-03-03
2001-05-08
Hepperle, Stephen M. (Department: 3753)
Fluid handling
Convertible
Reversible check
C137S505180, C137S599090, C137S599110, C137S601210
Reexamination Certificate
active
06227231
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a pressure/flow rate control valve which makes it possible to control the pressure and the flow rate of a pressure fluid supplied to or discharged from an actuator such as a cylinder.
2. Description of the Related Art
A pressure/flow rate control valve has been hitherto known, which is used to control the pressure and the flow rate of a pressure fluid supplied to or discharged from an actuator such as a cylinder.
The present applicant has already suggested a flow rate-adjusting valve-equipped pressure control valve which functions as a check valve when the pressure is supplied to a cylinder. The flow rate-adjusting valve-equipped pressure control valve comprises a flow rate-adjusting valve for adjusting the flow rate of the pressure fluid flowing therethrough depending on the opening degree of its valve plug when the pressure fluid is discharged from the cylinder, and a pressure control valve for supplying the pressure fluid with the pressure reduced depending on the force generated by a pressure-adjusting spring when the pressure is supplied to the cylinder, wherein the flow rate-adjusting valve and the pressure control valve are arranged in parallel to one another (see Japanese Utility Model Publication No. 62-12081).
SUMMARY OF THE INVENTION
A general object of the present invention is to provide a pressure/flow rate control valve which makes it possible to adjust the secondary pressure by means of a simple and convenient mechanism, reduce the number of parts, and realize a smaller size and a lighter weight.
The above and other objects, features, and advantages of the present invention will become more apparent from the following description when taken in conjunction with the accompanying drawings in which a preferred embodiment of the present invention is shown by way of illustrative example.
REFERENCES:
patent: 4147179 (1979-04-01), Miura
patent: 4171007 (1979-10-01), Bouteille
patent: 4197874 (1980-04-01), Neff
patent: 4271864 (1981-06-01), Neff
patent: 6131610 (2000-10-01), Morisako et al.
patent: 62-12084 (1987-03-01), None
Hosono Masayuki
Yang Qinghai
Hepperle Stephen M.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
SMC Kabushiki Kaisha
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