| 摘要 |
<p>PCT No. PCT/GB93/02458 Sec. 371 Date May 24, 1995 Sec. 102(e) Date May 24, 1995 PCT Filed Nov. 30, 1993 PCT Pub. No. WO94/12788 PCT Pub. Date Jun. 9, 1994A fluid flow control valve includes first and second electrically conductive body members separated by an electrically active separation member having electrical resistance. A valve actuation member is slidably located within the second body member, making a sliding electrical contact with the second body member. The valve actuation member can move from a first position spaced from the first body member to a second position electrically connecting the first body member with the second body member, thus forming a low resistance electrical connection. In its first position spaced from the first body member, the resistance of the electrical connection between the body members depends on the electrical resistance of the separation member. An electrical circuit, connected across the body and members including a current limiting resistor, forms a voltage splitter circuit with the separation member to enable an output voltage signal indicative of contact of the valve actuation member with the first body member to be obtained.</p> |
