| 摘要 |
<p>1,203,074. Valves. Y. KUZE. 24 Aug., 1967 [27 Aug., 1966; 5 Nov., 1966; 14 Feb., 1967; 29 March, 1967], No. 39040/67. Heading F2V. [Also in Division G1] A temperature responsive actuator for a valve 13 comprises a heat-conductive chamber 10 in which is disposed a guide 18 for a push-rod 23, the remaining space in the chamber 10 being filled with a thermally expansible material 22, e.g. wax, to push the rod 23 outwardly from the chamber 10 and open the valve 13 against the action of a spring 12, a plug 20 of rubber or other resilient material being interposed between the expansible material 22 and the rod 23 to seal against the guide 18 and prevent leakage of the material 22. The guide 18 has an end portion which is held in place by a flange 17 integral with the walls of the chamber 10. An anti-chafing disc 25 of plastics material is interposed between the plug 20 and the end of the push-rod 23, the end of the plug 20 contacting the material 22 preferably having a convex shape, and the plug being shaped to have an enlarged diameter at this end, so that it has to be compressed radially to force it into the guide 18. This assists the sealing action of the plug 20. A ring seal 27 held in place by a disc 28 provides a seal between the push-rod 23 and guide 18, the push-rod 23 being secured, adjustably as shown, or by riveting to a bridge member 6 on a housing 1 in which is formed a seat 5 for the valve 13. After repeated use and when the durability of the plug 20 has come to an end, the valve 13 is arranged to remain open since at this stage the ageing of the plug will increase the friction between the plug 20 and the guide 18 to such an extent that the friction will overcome the effect of the spring 12 tending to close the valve which will thus remain open.</p> |
