Patent GB-476004-A (GB)
Title: Improvements in radiator inlet valves
IPC: F16K1/52
Filed: 1937-02-23
Abstract: 476,004. Manually-actuated valves. DUNHAM CO., Ltd., C. A. Feb. 23, 1937, No. 5476. Convention date, Jan. 11. [Class 135] [Also in Group XXV] In a radiator inlet valve operated manually by a member 37, Fig. 1, mounted for pivotal movement between two extreme positions, a lost motion connection which is adjustable by an authorized person is provided between the member 37 and the longitudinally movable valve stem 22 to limit the maximum lift of the valve and hence the maximum flow of steam or other fluid. As shown in Fig. 1, the handle 37 is screwed to a collar 36 adjustably splined on a nut 32 which engages an externally threaded nut 45 non-rotatably engaging a squared or other non-circular part 25 of the stem 22. The latter is prevented from rotating by engagement of a second square or non- circular portion 24 in a corresponding aperture in a plate 28 which is clamped with the upper end of a sealing bellows 29 to the valve casing 1 by a cover member 7. The latter also engages a flange 33 on the nut 32 to restrain it from axial movement. A set-screw 42 in the collar 36 engages a groove between splined collars 40 on the nut 32. The nut 45 is free for axial movement, when operated by the nut 32, between a shoulder 26 on the valve stem and the lower surface of a locking sleeve 47, Fig. 9. The latter is non-rotatably connected to the stem 22 and has an internal collar 55 for snapping over a collar 52 formed by the enlarged ends of resilient fingers 49 on a nut 48, Fig. 8, screwed on to an upper threaded portion 27 of the stem 22. The upward movement of the nut 48 is limited by a flange 63 on the nut 32. The nut 48 is enclosed by a cap nut 59 having a name or other plate 61. The valve member 11 which is swivelly-mounted on the stem 22 comprises a disc with a threaded stem 12 and a gasket 13 surrounded by a ferrule 14. The valve seat 10 is of semicircular cross-section or is flared outwardly. A metering sleeve 16 with a number of vertical slots 20 which may terminate at different heights is screwed on to the stem 12 and slides with a close fit in the seat passage 9. The upper ends of the slots are bevelled as at 21 so as to be tangential to the curved surface of the seat 10. When the valve is closed, the nut 45 presses on the shoulder 26 and is spaced from the base of the sleeve 47. The effect of rotating the handle 37 is to raise the nut 45 until the play between it and the sleeve 47 is taken up whereupon further rotation opens the valve until the handle reaches the limit of its motion. The extent of this lost motion is adjusted by removing the cap nut 59 and adjusting the nut 48. The locking sleeve 47 preserves this adjustment. The possible lift of the valve and hence the maximum permissible flow decreases as the amount of lost motion is increased. The collar 36 has a pointer 43 co-operating with a scale 44. The form shown in Fig. 10 is intended to be operated as well as adjusted only by an authorized operator. A cap 66 with a socket 71 for a key is splined on the nut 32 and enclosed by a cover 68 having an opening 70 for the operating key. Both the cap 66 and the cover 68 are removed to adjust the nut 48.