| 摘要 |
<p>437,391. Thermally-actuated valves. FRIEDMANN, L., and FRIEDMANN, M., (trading as FRIEDMANN, A., [Firm of]), 6, Am Tabor, Vienna. May 18, 1934, No. 15080. Convention date, May 20, 1933. [Class 135] [See also Group XIII] In regulating-apparatus for steam-heating systems comprising a steam inlet valve 3 controlled by a thermal element 5 subject to the temperature of the condensed water, so that the temperature of the radiator (not shown) is maintained constant in the known manner, a heating coil 10 or its equivalent is supplied with electric current through a room temperature regulator and a contact device 22 which opens when the steam inlet valve has been closed. This current is of considerable strength and is controlled by a relay 14 and an auxiliary circuit including the contact 22 which shortcircuits the coil 19 of the relay and is directly or indirectly operated by the thermal elements. The current in the heating coil 10 is established by the temperature regulator 20, as soon as a desired room temperature is reached, and the thermal element 5 is thus caused to close the steam inlet valve. The connection between the element 5 and the valve 3 includes a spring 4, and the element 5 actuates a lever 28 to open the contact 22 whereupon the current in the heating coil 10 is cut off. The contact device 22 floats about its closing position until the contacts of the regulator 20 open. The contact device is arranged outside the steam chamber by utilizing a plane metallic diaphragm as the pivot of the lever 28.</p> |
