| 摘要 |
A sub-unit valve body 10 has an external flange 11 for incorporating in preferably metal valve bodies and an internal bore 14 in which an open flanged cage 18 oscillates according to fluid pressure or vacuum conditions. A valve chamber has three different valve seating portions 15, 16, 17 which cooperate with a two part valve closure 27, 28 which is attached to the base of the cage. Valve closure part 28 is resilient and contacts seat portion 15 under no flow conditions. Under back pressure the valve member rests into the seating with rigid part 27 contacting seat portion 17 and resilient part 28 contacting seat portions 15, 16. <IMAGE> |
