GB1153381A - Tank Coupling. - Google Patents

Abstract

1,153,381. Fluid-pressure servomotor systems. AEROQUIP A.G. Nov. 9, 1966, No.50281/66. Heading G3P. A fuel tank filling apparatus which allows the admission of only a predetermined amount of fuel, comprises a float and valve mechanism 20 which controls a fuel supply valve 16 in accordance with the fuel level in the tank. The supply valve 16 consists of a housing 22, which is screwed into a vertical wall 12 of the tank 10, and has formed within it a chamber 40 and channel 24, the latter being connected to a supply line 34 by a nut 32. Located within this chamber in a differential area U-shaped movable piston 60 and a fixed T-shaped member 46, the two being in sliding contact with one another. A duct 140, at one of its ends communicates, through an extension 110, with the larger face 62 of piston 60 and at the other end with a valve 130, a small bleed passage 116, opening into the channel 24, being interposed between these connections. In the closed position, Fig.2 (not shown), face 62 of the piston abuts section 54 of the T-shaped member and so the lateral walls of the piston close ports 106 communicating with the tank. Upon the float attaining the full line position shown and hence valve 130 opening, supply pressure acting on piston face 62 is relieved via the valve 130 and so the supply fluid-pressure acting on the smaller annular face 70 of the piston overcomes the biasing due to a spring 88 and moves the piston to the position shown, thereby allowing fuel to flow into the tank. On reaching a certain predetermined level, the float 118 attains the dotted line position and in doing so closes the valve 130. This prevents fluid entering duct 140, through passage 116, to pass into the tank and so a pressure build-up occurs until the pressures within channel 24 and duct 140 have been equalized. This pressure acts, through the extension 110, on face 62 of the piston and although the pressure acting on the two end faces of the piston is now the same, a (net) force is produced on account of the different end-face areas and so the piston moves to close ports 106. Further addition of fuel may be achieved by manually unseating, through a lever mechanism 102, (100), the valve 80 thereby reducing the pressure acting on the face 62 at which stage, further use of the lever mechanism places the piston in its open position and fuel flow is restarted. On releasing the mechanism, the valve is again closed by the increased pressure acting on face 64.