ES314061A1 - Improved cap for closing the filling pipe of a radiator or like liquid container - Google Patents

Abstract

An over-pessure and under-pressure valve closure cap for a radiator comprises a plastics cover 1 having a peripheral flange 1a from which locking fingers 10, 11 extend inwardly, the lower face of the cover having a surface resting on the upper rim of a radiator filling tube 2 and an annular resilient lip 34 engaging the interior of the tube, a boss 20 supporting a double valve 23 forced against a button 21 by a spring 27. Diametrically opposed finger tabs 4, 5 are formed integrally with the cover 1 which is preferably a moulded superpolyamide. Notches 13, and stops are located on the edge 12 of the filling tube 2 for engagement with the locking fingers 10, 11 so that the cover 1 may be secured in position. The valve 23 has a radially extending slot which enables the valve to be assembled over the button 21. An edge 30a of a synthetic rubber lining 30 fits into-an annular groove 29 in the valve 23 which may also be made of superpolyamide. If an under-pressure exists in the radiator, the lining 30 is deflected downwards and a boss portion 31 of the lining no longer seals a hole 32 which connects with the radiator through holes 33. An over-pressure in the radiator causes the lining 30 to be lifted from its seat 2a on the filling tube 2 and the pressure is vented through an overflow pipe 36. A rounded portion 34a of the lip 34 remains in contact with the wall of the filling tube 2 when the cover 1 is removed until the lining 30 has been withrawn from the seat 2a, thereby ensuring that any fluid under pressure in the radiator is vented through the overflow pipe 36 and not up the filling tube towards the faces of the operator.