| 摘要 |
<p>700,790. Valves. DOWTY AUTO UNITS, Ltd. July 15, 1952 [July 19, 1951], No. 17192/51. Class 135 A relief valve comprises a cylindrical housing 14 with an inlet 21 at one end and an outlet 32. a seat member 24 resting against the end wall of the housing and adjustable laterally therein, a sleeve 30 which serves to clamp the seat in position and through which the stem of the valve closure member 26 can slide under a spring loading, and the member 26 is so shaped that, when the valve is being assembled, it can enter the opening in the seat member to position the latter before screw means is actuated to cause the sleeve to clamp the seat member in the adjusted position. The valve stem consists of a socket member 34 which has its edge pressed over the ball 26 and is freely slidable in a stem member 37 which is packed at 38 where it slides through the sleeve 30. The valve loading spring 40 is positioned between a flange 41 on the member 37 and a hollow nut 42 which screws into a nut 29 abutting against and forcing the sleeve 30 against the seat 21. An eye bolt 44 on the end of member 37 receives a loop 47 which, when pulled, relieves the ball 26 of the spring loading. The valve is shown applied to the hydraulic pit prop disclosed in Specification 636,568, [Group XXX]. The chamber into which the relief valve discharges is kept at atmospheric pressure by a valve 48. The latter consists of a rubber lift valve member which is lightly spring loaded to allow air to enter the chamber and which is provided with a breather slit to allow the escape of air from inside the chamber.</p> |
