GB1106290A - A fluid mixing and regulating valve - Google Patents

Abstract

1,106,290. Valves. A. KNAPP. 14 July, 1966 [17 July, 1965 (2)], No. 31589/66. Heading F2V. A mixing valve has inlet ports 2<SP>1</SP>, 2<SP>11</SP> and an outlet port 3, the flow being controlled by a closure member 8 which is rotatable to vary the mixing ratio and axially movable to vary the flow rate. A sleeve 4 of plastically deformable synthetic material, which may be split axially, grips a portion of member 8 under the action of an elastic, e.g. rubber, sleeve 6. The area so gripped is confined to the region adjacent the ports in the sleeve 4 by providing recesses in the latter or in sleeve 6 or in the housing 1; alternatively, the sleeve 4 may have annular ribs on its inner and/or outer surface around the ports. As a further alternative the sleeve 6 may have enlarged openings receiving 0-rings which bear against sleeve 4 around the ports thereof. The closure member has valving portions 8a, 8b and 9. In the alternative embodiment of Figs. 11-13, not shown, sleeve 4 is omitted and the closure member is split and is of deformable plastics material and has a resilient insert (34) which urges it outwardly into sealing contact with sleeve (4). The valving portions 8a, 8b are replaced by two series of axially extending grooves (28). As a further alternative bush (4) is of deformable material and the closure member is split and urged into contact with the bush by an internal resilient member. Movement of the closure member in both embodiments is controlled by a lever 10 having a spherical end 12 received in a semicircular shaped groove 13 which extends around a semi-circular extension l4<SP>1</SP> of sleeve 14. An intermediate cylindrical portion 11 of the lever is received in a slot in member 8. A cap 16 secured to member 8 has a slot 19 allowing restricted pivotal movement of the lever. The extension 14<SP>1</SP> limits the rotary movement of the lever.