GB1111301A - Collapsible containers fitted with inlet valves - Google Patents

Abstract

1,111,301. Filling and emptying tanks. PARKER - HANNIFIN CORPORATION. 19 Aug., 1965, No. 35676/65. Heading B8T. [Also in Divisions F2 and G3] The top wall of an inflatable tank T carries a valve 1 and an inlet/outlet port 4. The valve comprises a main closure member 7, 11 defining a chamber 10 that communicates with the port 4 via a restricted tube 18 and with the tank via a check valve 16 and pilot valve 14 biased to the open position by a spring 20 acting through a diaphragm 31. A stem 37 abuts the plate 24 carrying the pilot valve and is connected to one end of a cable 38 the other end of which is connected to the base of the tank. When the tank is being filled, the pilot valve is open and the supply pressure opens valve 7 against a spring 9. As the tank is being filled, the top wall rises carrying with it the valve 1. When the cable 38 prevents further rising of the pilot valve, continued movement of the top wall allows spring 23 to seat the pilot valve and the resultant increase in pressure in chamber 10 closes the main valve. If the cable breaks, the increased pressure in the tank moves diaphragm 31 to allow the pilot valve to seat. When it is required to discharge the contents of the tank, a negative pressure in port 4 exhausts chamber 10 and allows tank pressure acting above diaphragm 11 to open the main valve. In Fig. 2, not shown, cable 38 is omitted and the spring- loading on diaphragm (31<SP>1</SP>) is made adjustable. In Fig. 3, not shown, after the pilot valve (57) and main valve (53) have closed as a result of tank pressure acting on diaphragm (59), and after removal of the tank filling line to expose passage (51) to ambient pressure the main valve is kept closed by fluid at tank pressure flowing to chamber (55) via a check valve (70) and line (71), a check valve (72) serving to prevent leakage into the passage (51). When the negative pressure is applied to discharge the tank, it acts via passage (69) to reseat a valve (65) against spring (66) on a seat (75) thereby putting chamber (55) in communication with line (69) via chamber (68) and allowing tank pressure above the diaphragm carrying the main valve to unseat the latter. During closure of the main valve, the latter varies the effective size of restricted passage (73) to prevent shocks. In Fig. 4, not shown, when the tank pressure reaches a predetermined value it acts on diaphragm (110) to seat pilot valve (106) thereby allowing pressure to build up in a chamber (86) via line (88) to seat the main valve (85). A check valve (105) is provided in the inlet (87), the latter being held open by a pipe fitting during discharge. A cover (122) is provided.