| 摘要 |
<p>A valve body is fabricated by injecting rubber through a channel extending along the central longitudinal axis of a cylindrical body having a conical-shaped end portion and out through a pair of transverse channels to form a flexible resilient sealing surface having a flexible lip, the resilient sealing surface being formed at a slightly greater angle than the adjacent metal frusto-conical sealing surface on the body. The central and transverse channels used for injecting the rubber serve as a mechanical lock between the resilient sealing surface and the metal body of the valve. In addition, the resilient sealing surface is chemically bonded to the metal body of the valve. A plastic valve guide having a continuous ring on one end and a centrally oriented guide portion having three arcuate surfaces equally spaced around the circumference of the valve body are arranged such that the valve body can move longitudinally within the valve guide.</p> |
