Hydraulically or pneumatically controllable slide valve arrangement

Claim 2

A fluid-operated, in particular hydraulically or pneumatically controllable slide valve arrangement for alternately communicating in flow relationship an outflow conduit with a pressure conduit and return flow conduit of a fluidoperating system, comprising a slide valve housing provided with an outflow conduit, a pressure conduit and a return flow conduit, a sleeve valve member having opposed end faces, a respective coaxially extending displacement piston member acting upon each end face of said sleeve valve member, the effective crosssectional area of both of said displacement piston members differing from one another and being considerably smaller than the cross-sectional area of said sleeve valve member, fluidoperated control circuit means for continually applying a predetermined control pressure of a fluid medium to said displacement piston member possessing the smaller effective cross-sectional area and for alternately selectively applying the control pressure of the fluid medium of said control circuit means and a considerably smaller pressure to the other displacement piston member possessing the larger effective crosssectional area.

Claim 3

A fluid-operated, in particular a hydraulically or pneumatically controllable slide valve arrangement as defined in claim 1, wherein said slide valve housing includes a lengthwise extending bore slidably receiving said sleeve valve member, discharge means for leakage fluid medium, said sleeve valve member being provided with at least one internal bore means for communicating the regions of said lengthwise extending bore located in front of said end faces of said sleeve valve member with said discharge means for said leakage fluid medium.

Claim 4

A fluid-operated, in particular a hydraulically or pneumatically controllable slide valve arrangement as defined in claim 1, further including an additional sleeve valve constructed as a slide valve provided at said slide valve housing, said additional sleeve valve serving for alternately operatively connecting said sleeve valve member with the pressure conduit of the fluid-operating system and for disconnecting therefrom, said additional sleeve valve having opposite situated end faces, a respective membrane cooperating with each end face of said additional sleeve valve for reciprocating the latter to and fro each of said membranes possessing an external face, respective control connection means neighboring said external face of each associated membrane and capable of being alternately subjected to an overpressure through the action of pneumatic or hydraulic control elements.

Claim 5

A fluid-operated, in particular a hydraulically or pneumatically controllable slide valve arrangement as defined in claim 3, further including means providing a respective compartment between each end face of said additional sleeve valve and its associated membrane, and discharge channel means for escaping fluid medium communicating with said respective compartments.

Claim 6

A fluid-operated, in particular hydraulically or pneumatically controllable slide valve arrangement for alternately communicating in flow relationship an outflow conduit with a pressure conduit and return flow conduit of a fluid-operating system, comprising a slide valve housing provided with an outflow conduit, a pressure conduit and a return flow conduit, a sleeve valve member having opposed end faces, a respective coaxially extending displacement piston member acting upon each end face of said sleeve valve member, the effective cross-sectional area of both of said displacement piston members differing from one another, fluid-operated control circuit means for continually applying a predetermined control pressure of a fluid medium to said displacement piston member possessing the smaller effective cross-sectional area and for alternately selectively applying the control pressure of the fluid medium of said control circuit means and a considerably smaller pressure to the other displacement piston member possessing the larger effective cross-sectional area, said slide valve housing incorporating cover means, said sleeve valve member having a bore, said displacement piston member possessing the smaller effective cross-sectional area and continually subjected to said control pressure being disposed in said bore and being impacted by said control pressure in the same direction as said displacement piston member possessing the larger effective cross-sectional area, said displacement piston member of smaller cross-sectional area bearing against said cover means, said sleeve valve member pushing against said displacement piston member possessing the smaller effective cross-sectional area as soon as the other displacement piston member of larger cross-sectional area is no longer subjected to the action of the control pressure.

Claim 7

A fluid-operated, in particular hydraulically or pneumatically controllable slide valve arrangement for alternately communicating in flow relationship an outflow conduit with a pressure conduit and return flow conduit of a fluid-operating system, comprising a slide valve housing provided with an outflow conduit, a pressure conduit and a return flow conduit, a sleeve valve member having opposed end faces, a respective coaxially extending displacement piston member acting upon each end face of said sleeve valve member, the effective cross-sectional area of both of said displacement piston members differing from one another, fluid-operated control circuit means for continually applying a predetermined control pressure of a fluid medium to said displacement piston member possessing the smaller effective cross-sectional area and for alternately selectively applying the control pressure of the fluid medium of said control circuit means and a considerably smaller pressure to the other displacement piston member possessing the larger effective cross-sectional area, said slide valve housing incorporating cover means, said sleeve valve member having a bore, said displacement piston member possessing the smaller effective cross-sectional area and continually subjected to said control pressure being disposed in said bore and being impacted by said control pressure in the same direction as said displacement piston member possessing the larger effective cross-sectional area, said displacement piston member of smaller cross-sectional area bearing against said cover means, said sleeve valve member pushing against said displacement piston member possessing the smaller effective cross-sectional area as soon as the other displacement piston member of larger cross-sectional area is no longer subjected to the action of the control pressure.

Claim 8

A fluid-operated, in particular hydraulically or pneumatically controllable slide valve arrangement for alternately communicating in flow relationship an outflow conduit with a pressure conduit and return flow conduit of a fluid-operating system, comprising a slide valve housing provided with an outflow conduit, a pressure conduit and a return flow conduit, a sleeve valve member having opposed end faces, a respective coaxially extending displacement piston member acting upon each end face of said sleeve member, the effective cross-sectional area of both of said displacement piston members differing from one another, fluid-operated control circuit means for continually applying a predetermined control pressure of a fluid medium to said displacement piston member possessing the smaller effective cross-sectional area and for alternately selectively applying the control pressure of the fluid medium of said control circuit means and a considerably smaller pressure to the other displacement piston member possessing the larger effective cross-sectional area, an additional sleeve valve constructed as a slide valve provided at said slide valve housing, said additional sleeve valve serving for alternately operatively connecting said sleeve valve member with the pressure conduit of the fluid-operating system and for disconnecting therefrom, said additional sleeve valve having opposite situated end faces, a respective membrane cooperating with each end face of said additional sleeve valve for reciprocating the latter to and fro, each of said membranes possessing an external face, respective control connection means neighboring said external face of each associated membrane and capable of being alternately subjected to an overpressure through the action of pneumatic or hydraulic control elements, means providing a respective compartment between each end face of said additional sleeve valve and its associated membrane, discharge channel means for escaping fluid medium communicating with said respective compartments, said slide valve housing incorporating cover means, said sleeve valve member having a bore, said displacement piston member possessing the smaller effective cross-sectional area and continually subjected to said control pressure being disposed in said bore and being impacted by said control pressure in the same direction as said displacement piston member possessing the larger effective cross-sectional area, said displacement piston member of smaller cross-sectional area bearing against said cover means, said sleeve valve member pushing against said displacement piston member possessing the smaller effective cross-sectional area as soon as the other displacement piston member of larger cross section area is no longer subjected to the action of the control pressure.

Claim 9

A fluid-operated, in particular hydraulically or pneumatically controllable slide valve arrangement for alternately communicating in flow relationship an outflow conduit with a pressure conduit and return flow conduit of a fluid-operating system, comprising a slide valve housing provided with an outflow conduit, a pressure conduit and a return flow conduit, a sleeve valve member having opposed end faces, a respective coaxially extending displacement piston member acting upon each end face of said sleeve member, the effective cross-sectional area of both of said displacement piston members differing from one another, fluid-operated control circuit means for continually applying a predetermined control pressure of a fluid medium to said displacement piston member possessing the smaller effective cross-sectional area and for alternately selectively applying the control pressure of the fluid medium of said control circuit means and a considerably smaller pressure to the other displacement piston member possessing the larger effective cross-sectional area, an additional sleeve valve constructed as a slide valve provided at said slide valve housing, said additional sleeve valve serving for alternately operatively connecting said sleeve valve member with the pressure conduit of the fluid-operating system and for disconnecting therefrom, said additional sleeve valve having opposite situated end faces, a respective membrane cooperating with each end face of said additional sleeve valve for reciprocating the latter to and fro, each of said membranes possessing an external face, respective control connection means neighboring said external face of each associated membrane and capable of being alternately subjected to an overpressure through the action of pneumatic or hydraulic control elements, means providing a respective compartment between each end face of said additional sleeve valve and its associated membrane, discharge channel means for escaping fluid medium communicating with said respective compartments, said slide valve housing incorporating cover means, said sleeve valve member having a bore, said displacement piston member possessing the smaller effective cross-sectional area and continually subjected to said control pressure being disposed in said bore and being impacted by said control pressure in the same direction as said displacement piston member possessing the larger effective cross-sectional area, said displacement piston member of smaller cross-sectional area bearing against said cover means, said sleeve valve member pushing against said displacement piston member possessing the smaller effective cross-sectional area as soon as the other displacement piston member of larger cross section area is no longer subjected to the action of the control pressure.

Claim 10

A fluid-operated, in particular hydraulically or pneumatically controllable slide valve arrangement for alternateLy communicating in flow relationship an outflow conduit with a pressure conduit and return flow conduit of a fluid-operating system, comprising a slide valve housing provided with an outflow conduit, a pressure conduit and a return flow conduit, a sleeve valve member having opposed end faces, a respective coaxially extending displacement piston member acting upon each end face of said sleeve valve member, the effective cross-sectional area of both of said displacement piston members differing from one another, fluid-operated control circuit means for continually applying a predetermined control pressure of a fluid medium to said displacement piston member possessing the smaller effective cross-sectional area and for alternately selectively applying the control pressure of the fluid medium of said control circuit means and a considerably smaller pressure to the other displacement piston member possessing the larger effective cross-sectional area, an additional sleeve valve constructed as a slide valve provided at said slide valve housing, said additional sleeve valve serving for alternately operatively connecting said sleeve valve member with the pressure conduit of the fluid-operating system and for disconnecting therefrom, said additional sleeve valve having opposite situated end faces, a respective membrane cooperating with each end face of said additional sleeve valve for reciprocating the latter to and fro each of said membranes possessing an external face, respective control connection means neighboring said external face of each associated membrane and capable of being alternately subjected to an overpressure through the action of pneumatic or hydraulic control elements, said slide valve housing incorporating cover means, said sleeve valve member having a bore, said displacement piston member possessing the smaller effective cross-sectional area and continually subjected to said control pressure being disposed in said bore and being impacted by said control pressure in the same direction as said displacement piston member possessing the larger effective cross-sectional area, said displacement piston member of smaller cross-sectional area bearing against said cover means, said sleeve valve member pushing against said displacement piston member possessing the smaller effective cross-sectional area as soon as the other displacement piston member of larger cross-sectional area is no longer subjected to the action of the control pressure.

Claim 11

A fluid-operated, in particular hydraulically or pneumatically controllable slide valve arrangement for alternateLy communicating in flow relationship an outflow conduit with a pressure conduit and return flow conduit of a fluid-operating system, comprising a slide valve housing provided with an outflow conduit, a pressure conduit and a return flow conduit, a sleeve valve member having opposed end faces, a respective coaxially extending displacement piston member acting upon each end face of said sleeve valve member, the effective cross-sectional area of both of said displacement piston members differing from one another, fluid-operated control circuit means for continually applying a predetermined control pressure of a fluid medium to said displacement piston member possessing the smaller effective cross-sectional area and for alternately selectively applying the control pressure of the fluid medium of said control circuit means and a considerably smaller pressure to the other displacement piston member possessing the larger effective cross-sectional area, an additional sleeve valve constructed as a slide valve provided at said slide valve housing, said additional sleeve valve serving for alternately operatively connecting said sleeve valve member with the pressure conduit of the fluid-operating system and for disconnecting therefrom, said additional sleeve valve having opposite situated end faces, a respective membrane cooperating with each end face of said additional sleeve valve for reciprocating the latter to and fro each of said membranes possessing an external face, respective control connection means neighboring said external face of each associated membrane and capable of being alternately subjected to an overpressure through the action of pneumatic or hydraulic control elements, said slide valve housing incorporating cover means, said sleeve valve member having a bore, said displacement piston member possessing the smaller effective cross-sectional area and continually subjected to said control pressure being disposed in said bore and being impacted by said control pressure in the same direction as said displacement piston member possessing the larger effective cross-sectional area, said displacement piston member of smaller cross-sectional area bearing against said cover means, said sleeve valve member pushing against said displacement piston member possessing the smaller effective cross-sectional area as soon as the other displacement piston member of larger cross-sectional area is no longer subjected to the action of the control pressure.