| 摘要 |
<p>1,207,197. Steam traps. K. FUJIWARA. 3 Jan., 1968 [11 Jan., 1967], No. 517/68. Heading F4U. [Also in Division F2] In a free float steam trap, a bimetal device prevents the float from shutting off discharge from the trap when the contents of the trap are below a predetermined temperature so that the formation of an air lock in the trap at start-up is prevented. As illustrated, the float 5 normally contacts or clears a valve seat 3 according to the level of condensate in the trap to control the discharge of condensate through a passage 16. However, when the contents of the trap are below normal working temperature, a bimetal disc 4 flexes to the position shown to prevent the float from contacting the valve seat. When steam enters the trap, the disc 4 flexes to the right to a position in which the valve seat projects through a central opening in the disc and in which the float may operate normally. If an air lock develops during normal operation, the trap will cool by radiation to a point at which the disc 4 unseats the float to discharge the air. The bimetal device may be of U-section, Figs. 8 and 9 (not shown), one arm being attached to the seat and the other being free to act on the float. The bimetal device may be located beneath the float, Fig. 5 (not shown), in which case the device may take the form of an apertured rectangle, Fig. 7 (not shown).</p> |
