Thermostatic Valve

Abstract: Disclosed is a valve (1) comprising a housing (10), a thermostatic element, a first shutter moved by the thermostatic element along an axis (X-X) relative to a first seat, which first seat is integrated with the housing to control a flow of fluid between first and second channels, a one-piece cage (50) rigidly connected to the housing, a first return spring (40) compressed along the axis applying opposing forces to the first shutter and the cage, a second shutter (80) axially moved by the thermostatic element relative to a second seat, which second seat is integrated with the cage to control a flow of fluid between the second channel (1A) and a third channel (1C), a third shutter (110) axially moved by the pressurised fluid in the second channel relative to a third seat, which third seat is integrated with the cage to control the flow of fluid between the second and third channels, and a second return spring (120) compressed along the axis applying opposing forces to the third shutter and the cage. The cage includes a tubular portion (51) which is centred on the axis and through the inside of which the fluid flows between the second and third channels when the second and third shutters are open. An outer face of the tubular portion of the cage is provided with a seal (60) which, when in use, isolates the the second and third channels from one another on the outside of the tubular portion. The cage also includes arms (53) which each extend towards the housing from the tubular portion and which connect the cage to the housing.

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