| 摘要 |
<p>In a pressure regulator for an air gun of pneumatic type, a discharge valve comprises a closure element comprising a cylindrical body (66) of a hard plastics material presenting a circular sealing edge for engagement with a frusto-conical seating (68). An operating stem (76) extending from the closure element is gripped solely by an O-ring (88) positioned at a distance from the closure element, whereby the stem is free to pivot in planes perpendicular to the O-ring. Some free radial movement of the closure element is so permitted, and thereby self-centring of the element on the seating.</p> |
