GB809123A - An improved metering valve for use on centralised liquid distribution systems - Google Patents

Abstract

809,123. Reciprocating pumps. WOLL, R. V. Feb. 3, 1956 [Nov. 4, 1954 ; April 4, 1955 ; April 22, 1955; May 23, 1955], Nos. 31904/54, 9711/55, 11656/55 and 14735/55. Class 102(1). [Also in Group XXXIV] A pump comprises a cylinder member A, Fig. 1, having a major cylinder 1 and a coaxial minor cylinder 2 in which works a differential piston B, the cylinders communicating at their outer ends with an alternating liquid supply. When liquid is supplied to cylinder 2 the piston is moved to the right and liquid passes by passages 8 and 9 to charge chamber 10 and by passage 6 to an annular groove 4. When pressure is supplied to the opposite side of the piston it causes the piston to move to the left and after passage 9 is closed by the cylinder 2 the annular groove 4 aligns with the outlet 3 and the liquid in chamber 10 is discharged past non-return valve C1. Several such pumps may be arranged in parallel forming a twin line system. In a modified form Fig. 3, once the chamber 28, passage 26 and annular groove 29 have been charged the liquid is by-passed via non-return valve 16 and passage 17, and on reversing the direction of flow, liquid is discharged through outlet 30 as above and when the piston opens passage 18 liquid is by-passed via passage 18, non-return valve 19 and passage 20. Several pumps of this type may be arranged in series forming a single line progressive system and each pump must function before liquid is by-passed to actuate the next pump in the line. The non-return valves may be omitted in which case a pump need not function before the subsequent pump. In further modifications the piston may be formed in two parts linked together and an indicator may be fitted to give visual indication of operation.