US 4,903,939 AGranted

Pneumatically-operated valve

AssigneeFujikura Rubber Ltd.

InventorsRyozo Ariizumi, Masakuni Kainuma, Toshikazu Aoki, Shoji Suda, Mitsunori Hoshi, Takashi Ejiri

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Abstract

A pneumatically-operated valve in which a valve actuator is formed of two separate parts: a driving member having a plurality of sealed pistons fixed to a piston rod in series to be operated by air pressure, and a valve operating member which comes into contact with a clean fluid and which does not have any soft substances such as O-rings which are likely to be impaired by ultrasonic cleaning. The valve facilitates the cleaning of the members during the process of manufacture and furthermore can provide a great deal of output for its size without contaminating the clean fluid during use.

Claims15

Dependent claims

A pneumatically-controlled valve for controlling the flow of fluid through a fluid passageway by movement of said valve between a normally-closed position and an open position with respect to a valve seat defined upon said fluid passageway, comprising:

valve means, disposed within the vicinity of said fluid passageway and spring-biased toward said open position, for controlling said flow of fluid through said fluid passageway;
a cylinder having a longitudinal axis defined therein;
a closure means for closing one end of said cylinder;
a transversely extending annular partition plate disposed within said cylinder for dividing said cylinder into first and second piston chambers;
an axially disposed piston rod movable within said cylinder between first operative and second inoperative positions, and extending through said annular partition plate so as to have opposite end portions thereof disposed within said first and second piston chambers;
first piston means fixedly secured upon one end of said piston rod and disposed within said first piston chamber;
spring biasing means, disposed within said first piston chamber and interposed between said closure means and said first piston means, for normally biasing said piston rod to said first operative position;
second piston means fixedly secured upon a first axially central portion of said piston rod and disposed within said second piston chamber, a second end portion of said piston rod being disposed within the vicinity of said valve means for engaging said valve means and moving said valve means to said normally closed position when said piston rod is disposed at said first operative position by said spring-biasing means;
inlet port means defined within a sidewall portion of said cylinder for introducing pressurized fluid into said first piston chamber in order to move said piston rod from said first operative position to said second inoperative position;
axially extending fluid passageway means defined within said piston rod from a second axially central portion of said piston rod to a third axially central portion of said piston rod;
a first transversely extending fluid passageway means defined within said second axially central portion of said piston rod for providing fluidic communication between a first end portion of said axially extending fluid passageway means of said piston rod and said first piston chamber;
and
a second transversely extending fluid passageway means defined within said third axially central portion of said piston rod for providing fluidic communication between a second end portion of said axially extending fluid passageway means of said piston rod and said second piston chamber.

10 more elements

Dependencies are inferred from the claim text.

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Abstract

valve means, disposed within the vicinity of said fluid passageway and spring-biased toward said open position, for controlling said flow of fluid through said fluid passageway;
a cylinder having a longitudinal axis defined therein;
a closure means for closing one end of said cylinder;
a transversely extending annular partition plate disposed within said cylinder for dividing said cylinder into first and second piston chambers;
an axially disposed piston rod movable within said cylinder between first operative and second inoperative positions, and extending through said annular partition plate so as to have opposite end portions thereof disposed within said first and second piston chambers;
first piston means fixedly secured upon one end of said piston rod and disposed within said first piston chamber;
spring biasing means, disposed within said first piston chamber and interposed between said closure means and said first piston means, for normally biasing said piston rod to said first operative position;
second piston means fixedly secured upon a first axially central portion of said piston rod and disposed within said second piston chamber, a second end portion of said piston rod being disposed within the vicinity of said valve means for engaging said valve means and moving said valve means to said normally closed position when said piston rod is disposed at said first operative position by said spring-biasing means;
inlet port means defined within a sidewall portion of said cylinder for introducing pressurized fluid into said first piston chamber in order to move said piston rod from said first operative position to said second inoperative position;
axially extending fluid passageway means defined within said piston rod from a second axially central portion of said piston rod to a third axially central portion of said piston rod;
a first transversely extending fluid passageway means defined within said second axially central portion of said piston rod for providing fluidic communication between a first end portion of said axially extending fluid passageway means of said piston rod and said first piston chamber;
and
a second transversely extending fluid passageway means defined within said third axially central portion of said piston rod for providing fluidic communication between a second end portion of said axially extending fluid passageway means of said piston rod and said second piston chamber.

10 more elements