Pressure modulating valve

Claim 2

A modulating valve device comprising first and second relatively movable wall means, respectively for transmitting force applied by a fluid motor to a work instrumentality and for sensing the reactive pressure of the work, a valve housing having a movable wall and forming a pressure chamber, first and second ports in the wall of said chamber, respectively, for admitting actuating fluid to said chamber and directing said fluid to the fluid motor, a valve actuable by said movable wall and cooperable with said second port, and a connection between said sensing wall means and said movable wall acting on said movable wall in opposition to the effect of the actuating fluid thereon.

Claim 3

A modulating valve device as described in claim 1 in which said movable wall is a flexible diaphragm traversing said chamber and said valve is secured centrally thereto.

Claim 4

A modulating valve device as described in claim 1 in which said first and second relatively movable wall means form a continuous wall, said first wall means being adapted for connection to a fluid motor and said second wall means being movably mounted in a central aperture in first wall means.

Claim 5

A modulating valve as described in claim 3 in which said movable wall is a diaphragm traversing said chamber to form a pressure chamber on one side thereof and said second wall means is actuably connected to the other side of said diaphragm.

Claim 6

A modulating valve device as described in claim 4 in which said fluid motor is a bellows peripherally attached to said first wall means.

Claim 7

The combination with a compressible means of a type subject to pressure variation when compressed and motor means for applying compressive force to said compressible means, of modulating means responsive to the reactive pressure of said compressible means for adjusting the compressive force applied by said motor means in proportion to the pressure change in said compressible means.

Claim 8

The combination with a compressible means of a type subject to pressure variation when compressed and motor means for applying compressive force to said compressible means, of modulating means responsive to the reactive pressure of said compressible means for adjusting the compressive force applied by said motor means in proportion to the pressure change in said compressible means.

Claim 9

The combination described in claim 6 in which said motor means is fluid pressure actuated and further including a source of pressured actuating fluid, said modulating means comprising a valve controlling the pressure applied to said motor means for varying the compressive force applied by said motor means.

Claim 10

The combination described in claim 7 in which said compressible means comprises a bag-like fluid container and said motor means includes a movable wall bearing against an increasing area of the container wall as the container empties during squeezing thereof.

Claim 11

The combination described in claim 8 further including a hollow housing carried by said movable wall, a diaphragm traversing the interior of said housing and forming therewith a pressure chamber on one side of said diaphragm, first and second port means connecting said pressure chamber, respectively to said source of actuating fluid and said motor means, the portion of said movable wall traversing said housing interior and engageable with said bag-like container being transversely movable relative to adjacent parts of said movable wall, and a connection between said latter mentioned movable wall portion and said diaphragm, said modulating means comprising a valve actuable by said diaphragm and cooperable with said second port means to vary the pressure applied by said motor means.

Claim 12

The combination described in claim 9 in which said motor means is of the expansible chamber type with an actuating part connected to said movable wall.

Claim 13

The combination described in claim 9 further including a rigid frame having opposed walls, said motor means, including said movable wall, being received in one portion of said frame adjacent one of said opposed walls and said bag-like container being received in another portion of said frame between said movable wall and the other opposed wall, said container being replaceable and there being an opening in the side of said latter frame portion for introduction and removal of charged and exhausted containers.