| 摘要 |
A modular clamp system in one embodiment has a case having an inlet and an outlet port, forming a housing for a resilient flow tube. Attached to the housing is a clamping member having two arms between which the flow tube passes. One end of the pair of arms fits within and is engaged by the hollow bore of threaded adjuster which is guided by the case. Turning the adjuster advances it, causing the arms to be pushed closer together, so as to progressively constrict the flow tube at a controllable rate. The arms may be tapered and the bore a right cylindrical bore, or the bore may be tapered and the arms untapered, in which case the tips of the arms contact with the interior face of the bore. The fineness of the screw threads and the degree of taper of the adjuster contacting surfaces may be so chosen that a full rotation of the adjuster causes a very small adjustment in flow rate. In one embodiment, the arms contain a transverse portion forming a collet surrounding the flow tube and cemented to it for positively deconstricting the flow tube upon release or opening of the valve. In another embodiment, the clamp forms an assembly which can be attached to an auxiliary control mechanism further embodiment, the adjuster has an integrally formed toothed gear, to permit uniform incremental rotation by the auxiliary control system.
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