Patent GB-899512-A (GB)
Title: Improvements in or relating to fluid metering apparatus
Inventor: MOORES JOHN ROBERT
IPC: F16N25/02
Filed: 1959-11-24
Abstract: 899,512. Valves. CASTROL Ltd. Nov. 24, 1960 [Nov. 24, 1959], No. 39865/59. Class 135. [Also in Group XXXIV] A fluid metering apparatus, such as a lubricant apparatus, of the kind comprising two supply lines, at least one metering device comprising a piston reciprocable in a cylinder, which device has associated with it a change-over valve under the control of which pressure fluid is supplied through the two supply lines to opposite ends of the cylinder of the metering device, the arrangement being such that when the change-over valve is in one position fluid pressure is applied to one end of the metering device cylinder and the piston therein is moved, by the pressure, towards the other end of the cylinder, thereby discharging through an outlet a measured quantity of the fluid which was charged into the cylinder during the previous operation and when the change-over valve is moved to its other position the fluid pressure is applied to the other end of the metering device cylinder to move the piston in the reverse direction to discharge (e.g. to a separate outlet point) a further measured quantity of fluid. The two supply lines end at connections 18, Fig. 1, communicating with a bore 14 which houses a valve member 17 such that when the pressure rises in one of these supply lines, due to the end of actuation of all the metering devices, the valve 17 is moved to contact one of the stops 15a and allow fluid to pass through a port 16 to act on a spring-loaded piston 11. The piston 11 moves in a housing 10 containing a low viscosity fluid which, on movement of the piston against the spring, is forced through axial passages 21a in a spring abutment member 21 and through an outlet 23a to provide a signal to actuate the change-over valve and/or an indicator. The change-over valve 40, Fig. 3, controls the connection between a feed line 41 and the two supply lines 42, 43 and is actuated by an auxiliary control valve 44. The fluid signal from the outlet 23a is fed to the lower end of a chamber 50 and acts on a piston member 61 against a spring. Upward movement of the piston connects the main feed line 41 through passage 54 and a reduced diameter portion 67 on the plunger rod to a passage 55 leading to the auxiliary control valve 44. With the valves in the position shown, fluid passes through port 80 and passage 45 to act on the left-hand side of the change-over valve to move it to the right, the right-hand side being open to the fluid reservoir through passages 46, port 81, passages 47, 49, chamber 50 and port 51. Movement of the change-over valve 40 to the right connects the main feed line 41 to the supply line 42 and fluid pressure then acts through passage 52 on the left-hand end of auxiliary valve 44 to move this to the right ready for the next signal which acts in a similar manner to move the valves back to the position shown. The housing 10, Fig. 1, is connected with a reservoir 32 of low viscosity fluid. A valve member 4 opens in the event of the pressure fluid in the housing 10 falling below atmospheric pressure to make up any losses through leakage. The outlet 23a may also be connected to the inlet of an indicator such that the signal raises a spring-loaded plunger to provide an indication that one cycle of discharge from the system has been completed and the change-over valve may then be actuated manually. Specification 872,918 is referred to.