| 摘要 |
1,131,385. Steam traps. E. I. DU PONT DE NEMOURS & CO. 27 June, 1967 [30 June, 1966], No. 29615/67. Heading F4U. [Also in Divisions F2 and G1] A bellows unit for operating a valve element 54 of a thermostatic trap device which comprises a valve seat element 32 and a thermostatic sealed bellows unit operatively connected to the valve element 54 to actuate the element in accordance with varying temperatures, comprises a hollow assembly having a wall structure 5, a portion of which is movable to an extended configuration when the temperature is above a given limited temperature range and movable to a retracted configuration when the assembly is subjected to a temperature below the given range, the closed space of the assembly being completely filled with a deaerated liquid when the movable wall portion is in its retracted position. The casing 1 has an inlet 21 and outlet 13, 42 in communication with interior 10 of the casing. Valve seat element 3 is provided in the outlet 13. In the rest position the valve member 54 is urged into engagement with the valve seat and remains so until heat transfers from the interior 10 to the surroundings causing the pressure inside the bellows to decrease causing the valve to open. Condensation of the vapour to liquid occurs, the liquid collecting in a cup-like element 9 above the bellows and in the bottom of casing 33 which liquid is discharged when the valve opens. The presence of the element 9 slows the movements of the valve element. |
