| 摘要 |
Floating valve in the form of a piston for pressure reducers formed of a metal element with a hollow rod (2) and a flat head (1) in the form of a disc, prepared so that it can be covered by a plastic (3) which is resistant to high pressures and, at the same time, capable of serving as a sealing means, provided with means for good adherence of the coating and with means for preventing bursting and obtaining perfect centring, that being with the aim of improving the operational safety of the apparatus in question and of facilitating the manufacture of the said valve on a large scale. <IMAGE>
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