Patent GB-418521-A (GB)
Title: Improvements in plate valve or orifice plate fittings for controlling the flow of fluids
IPC: G01F1/42
Filed: 1933-05-08
Abstract: 418,521. Valves ; regulating fluids ; pressure-actuated flow meters. BYRON JACKSON CO., 2150, East Slauson Avenue, Los Angeles, U.S.A. May 8, 1933, No. 13383. Convention date, May 31, 1932. [Classes 69 (i) and 135.] A plate-valve including an orificed plate for the measurement of compressible or incompressible fluids, such as gas, steam, or oil, by means of a differential pressure gauge, is provided with a pair of plates 8, 9 having orifices suitable for heavy and light demands, housed in a chamber 10 transverse to the valve-passage 7 and each movable by independent means, such as cranks 15, 21, operated by shafts 14, 22, through a communicating slot 11 into the valve-passage 7. One of the plates 8, 9 may be blank so as to act as a shut-off valve. The final movement of the plate 8 or 9 is one of rotation in the annular space forming its seat, so that pins 29, 30, in the valve-body, act on cam-surfaces 27, 28 on one face of the plate to wedge the plate against its seat 6. The plate may be further pressed against its seat by screwing against it a supplementary bar-valve 73, provided primarily as a means for bridging the slot 11, to cut off the plate-chamber 10 from the fluid-passage 7 when it is required to substitute other plates for those 8, 9 in use. For the latter purpose the dome 33 of the chamber 10 is removed, after bleeding the chamber to atmosphere by slackening off a screw-plug 80. The connections 17, 19 between the cranks 15 and their respective plates and operating-shafts are such as to permit axial movement of the plates 8, 9 to position them into alignment with the communicating slot 11, the plate-screw 19 engaging the cranks through taper sleeves 20. The mouth of the slot is flared to guide the plates, and the dome 33 of the chamber 10 is provided internally with cam surfaces 37 on which bear the plate-screws 19, so that these latter are also moved axially when the shafts 14, 22 are turned. At the bottom of the valve-body is a sump 49, drained periodically by a grooved screw-plug 51. The latter also accommodates a screw 54, which can be screwed upwards to loosen a jammed plate 8 or 9. The supplementary valve for isolating the chamber 10 comprises -a rectangular bar 73 engaged, at points spaced along its length, by the dovetailed ends of a stirrup 67, in screw engagement with an inclined operating- shaft 63. Wedging surfaces 77, 75 on the valvebar and valve-body serve to press the valvebar firmly against the upper seating surface 83. To prevent distortion of the valve-plates 8 or 9 when using the valve-bar 73 to assist in sealing them, a bearing shoulder 82 is provided opposite the valve - bar. Pressure leads for the differential gauge of the flow-measurer or recorder are led off at points 40, 41. Locking.-The plate-operating shafts 14, 22 are provided with locking-means comprising any suitable lock inserted through holes in straps 44, 45 on the shafts and adjacent lugs 47 on the valve-body. Only the shaft of the operative plate need be locked. The straps 44 also serve as indicators and prevent straining of the plates and cranks by limiting the movement of the shafts.