| 摘要 |
A pressure-limiting valve, particularly suitable for venting excess pressure from a conduit used for administering anaesthetic gas or oxygen in medical procedures, has an intake (21) and an exhaust (22). An annular valve seat (6) defines a central opening (61) subject to a valve plate (7), which can be lifted from the opening (61), allowing venting of gas when there is an excess pressure at the intake (21), against the restoring force of a spring (9). The valve seat (6) has a slot (8) and the valve plate (7) has a radial enlargement (76) with a varying radius. By rotating the top control knob (1, Fig. 1) the varying radius of the valve plate (7) can progressively unblock the slot 8 in the valve seat (6), allowing a controllable degree of bleeding of gas even when the plate (7) is not lifted from its seat. |
