Fluid pressure-operated systems

Claim 2

For a fluid pressure-operated system, in interconnecting unit comprising (a) a matrix block having primary and secondary sets of non-intersecting passages disposed in superposed relationship with each passage of each set extending transversely across all the passages of the other set; (b) individual linking passages joining each passage of the primary set with every passage of the secondary set; and (c) flow-controlling plug members adapted to be fitted to said linking passages selectively to control fluid flow between primary and secondary passages joined by the linking passage fitted with such a plug member.

Claim 3

The interconnecting unit of claim 1, including plug members of different functional types respectively adapted, when inserted into one of said linking passages, to exercise different control functions in respect of fluid flow between the primary and secondary passages joined by said linking passage.

Claim 4

The interconnecting unit of claim 2, including a plug member adapted to prevent fluid flow, in at least one direction, between primary and secondary passages joined by a linking passage into which said plug member has been inserted.

Claim 5

The interconnecting unit of claim 2, including a plug member adapted to restrict fluid flow, in at least one direction, between primary and secondary passages joined by a linking passage into which said plug member has been inserted.

Claim 6

The interconnecting unit of claim 2, including a plug member having a flow path adapted to open to permit fluid flow in response to a preselected pressure differential existing between primary and secondary passages joined by a linking passage into which said plug member has been inserted.

Claim 7

The interconnecting unit of claim 1 in which each plug member incorporates a plurality of fluid flow-controlling elements for selective operational relationship with the joined passages of the primary and secondary sets by selective positioning of the plug member in a linking passage.

Claim 8

The interconnecting unit of claim 6, including plug members having both flow-blocking and one-way flow elements selectively positionable in operative relation to the joined passages of the primary and secondary sets by insertion in the relevant linking passage.

Claim 9

The interconnecting unit of claim 1 in which the matrix block is of generally rectangular parallelepipedon shape, the passages of the primary set are parallel with one another and with major faces of the block and extend from one edge face thereof, the passages of the secondary set are parallel with one another and with the major faces of the matrix block but extend from another edge face of the latter with their axis at rightangles to those of the primary set passages, two said sets of passages being at different depths measured from one major face of the block to the non-intersecting, the linking passages extending through the block from one major face to the other major face thereof, and each intersecting an individual pair of primary and secondary set passages.

Claim 10

The interconnecting unit of claim 8 in which the plug members each comprise a shaft having a length greater than the length of a linking passage and an operative portion having a configuration matching that of the linking passage, flow-control elements comprising ring seals and related passages being disposed in said operative portion of the shaft.

Claim 11

The interconnecting unit of claim 9 in which each plug member has an operative portion carrying four sealing rings at intervals along its length so as to define three annuli disposed between pairs of sealing rings.

Claim 12

The interconnecting unit of claim 10 in which said annuli are so positioned on the operative portion of the shaft that the central annulus will align with a passage of one said set and one of the outer annuli of the plug member will align with a passage of the other said set when the plug member has been inserted into a linking passage joining said passages of said one and said other sets.

Claim 13

The interconnecting unit of claim 10 or 11 in which the two outer sealing rings and one of the inner sealing rings are arranged to seal against flow in either direction whereas the remaining sealing ring is asymmetric to seal only against fluid flow in one direction whilst to permit flow in the opposite direction.

Claim 14

The interconnecting unit of claim 10 or 11 in which at least one of the sealing rings on a plug member is of reduced effectiveness under low pressure differential.