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US 4,367,861 AGranted
Installation control valves
AssigneeMather & Platt Limited
InventorsGeddes A. Bray, Richard J. Holker
Life of this patent
Estimating the term…
Abstract
An installation control valve, for example for use in a fire fighting sprinkler installation, comprises a pivotal butterfly valve disc co-operable with a movable stop, which in one position abuts the valve disc to retain the valve closed against pressure forces acting thereon. A retaining mechanism is releasably held to resist stop movement and so prevent valve disc opening but is operable under a predetermined condition to permit stop movement from said one position to a second position. When the stop is in the second position, unequal pressure forces on either side of the valve disc cause same to move thereby opening the valve.
Claims18
An installation control valve comprising:
- (a) a valve body for disposition in fire extinguishing installation pipework downstream of a pressurized source of extinguishant;
- (b) a butterfly valve disc within said valve body and normally retained closed to prevent the flow of extinguishant through the installation pipework, said valve disc being fixedly rotatably mounted within said valve body about an axis of rotation, that is off-set longitudinally of the point of intersection of a plane in which the periphery of said valve disc lies and a longitudinal axis of said disc normal to said plane by a distance sufficiently great that said valve disc will open with a slight pressure differential thereon and will close upon cessation of fluid flow, and said axis of rotation being parallel to said plane in all positions of said valve disc;
- (c) a movable stop cooperable with said butterfly valve disc and which in one position abuts said valve disc to retain said valve closed against pressure forces acting thereon and which in a second position frees said valve disc for pivotal movement;
- and
- (d) a retaining mechanism which is releasably held to resist stop movement and prevent said valve disc from opening, and which is operable under a predetermined condition to permit stop movement from said one position to said second position whereby unequal pressure forces on either side of the said off-set axis on one side of the valve disc can cause valve opening.
2 more elements
An installation control valve comprising:
- (a) a valve body for disposition in fire extinguishing installation pipework downstream of a pressurized source of extinguishant;
- (b) a butterfly valve disc within said valve body and normally retained closed to prevent the flow of extinguishant through the installation pipework, said valve disc being fixedly rotatably mounted within said valve body about an axis of rotation that is off-set longitudinally of the point of intersection of a plane in which the periphery of said valve disc lies and a longitudinal axis of said disc normal to said plane, and said axis of rotation being parallel to said plane in all positions of said valve disc;
- (c) a baffle extending across said valve disc on the downstream side thereof, said baffle having dimensions such that said valve disc opens fully under the pressure of fluid flow and remains open at low flow velocities;
- (d) a movable stop cooperable with said butterfly valve disc and which in one position abuts said valve disc to retain said valve closed against pressure forces acting thereon and which in a second position frees said valve disc for pivotal movement;
- and
- (e) a retaining mechanism which is releasably held to resist stop movement and prevent said valve disc from opening, and which is operable under a predetermined condition to permit stop movement from said one position to said second position whereby unequal pressure forces on either side of the said off-set axis on one side of the valve disc can cause valve opening.
3 more elements
An installation control valve comprising:
- (a) a valve body for disposition in fire extinguishing installation pipework downstream of a pressurized source of extinguishant;
- (b) a butterfly valve disc within said valve body and normally retained closed to prevent the flow of extinguishant through the installation pipework, said valve disc being rotatably mounted within said valve body about an axis that is off-set longitudinally of the point of intersection of a plane in which the periphery of said valve disc lies and a longitudinal axis of said disc normal to said plane;
- (c) a movable stop cooperable with said butterfly valve disc and which in one position abuts said valve disc to retain said valve closed against pressure forces acting thereon and which in a second position frees said valves disc for pivotal movement;
- (d) a retaining mechanism which is releasably held to resist stop movement and prevent said valve disc from opening, and which is operable under a predetermined condition to permit stop movement from said one position to said second position whereby unequal pressure forces on either side of the said off-set axis on one side of the valve disc can cause valve opening;
- and
- (e) a projection extending inwardly from said valve body at a position so as to abut said valve disc opposite said movable stop to prevent said valve disc from jamming closed, a passage being formed through said projection and said valve body wherein said passage is closed in a closed position of said valve disc and communicated with the interior of said valve body in an open position of said valve disc to thereby provide to a point exterior to said valve body an indication of whether said valve is open or closed.
3 more elements
Dependencies are inferred from the claim text.