| 摘要 |
<p>A valve arrangement comprising a reciprocable valve (4) which is biased into a closed position by a spring (3) disposed between two spring seats (1 and 2) whose separation in the direction of movement of valve (4) is variable. Respective levers (8, 10 and 9, 11) are operatively coupled to the seats (1 and 2) and are simultaneously operated by a cam disc (25) to move the valve to its open position whilst maintaining the separation between the seats (1 and 2) during at least an initial portion of the opening movement.</p> |
