GB651634A - Improvements relating to sealing glands - Google Patents

Abstract

651,634. Stuffing-boxes. BRITISH INSULATED CALLENDER'S CABLES, Ltd., RICHARDSON, A. B. F. G., TUNNICLIFF, E., and FISHER, I. K. Nov. 4,1948, No. 28722. [Class 122(v)] In a sealing gland for a cable moving through an opening in the wall of a vessel 23 containing pressure fluid a cylinder 1 has clamped therein, between an apertured fixed end wall 9 and an apertured detachable end wall 11, a number of soft rubber bushes 2 having centrally apertured inner conical portions 4, all pointing in the same direction, attached to peripheral flange portions 3 of substantially less diameter than the cylinder bore and separated by the central portions 8 of spacing discs 6 each of which has a rim portion 7 which is a sliding fit in the cylinder 1 and projects beyond both faces of the central portion 8 to embrace the flange portions 3 of neighbouring bushes 2 and align them axially; the rim portions 7 have slots therein which place annular chambers 13 between the bushes 2 and the bore of cylinder 1 in communication with one another and the central portions 8 have passages 14 extending from the slots to the internal surface of the disc 6 and ports 20 are provided in the cylinder wall for the supply of counter-pressure liquid to the inter-communicating annular chambers 13. The detachable end wall 11 has an inner hub portion 15 which bears directly, or through a thrust washer 16, on the adjacent bush 2. Between the fixed end wall 9 and its adjacent bush 2 is a guide bush 17 having a slotted rim portion 19 displaced axially with respect to its hub portion so as to leave an annular space between the rim 19 and the end wall 9. Counter-pressure liquid which acts on the external surface of the bushes 2 to urge them against the cable (not shown) moving therethrough is supplied via pipe 31, ports 28a in a tube 25 forming an extension of the cylinder 1, ports 20, chambers 13, and passages 14. The apertures 5 of the bushes 2 in their normal state may be equal to or less than the cable cross-section. In a modification means are provided to cut off the supply of counterpressure liquid to the ports 20.