Domestic hot water service inlet shut off valve triggered by fluid level in overflow tray
First Claim
1. A mechanism for opening or closing a valve through which a liquid can flow when open, the mechanism having valve actuation means for moving said valve from a first position to a second position under the urging of urging means, trigger means which, when activated, trigger operation of said valve actuation means, said trigger means including retainer means which ordinarily hold said valve in said first position against the force applied by said urging means, and sensor means arranged so as to be displaced by a rise in the level of the liquid when it is suitably contained, whereby displacement of said sensor means provides a stimulus which is transmitted through a mechanical interaction to said trigger means so as to release said trigger means, and wherein said valve actuation means comprises a rotor connected to a spindle adapted for operative association with said valve and said urging means comprises a torsion spring adapted to act on said rotor, and further comprising a locking cap which extends over and around said rotor and holds the torsion spring in a compressed configuration in order to prevent the induction of rotary motion in said spindle until said trigger means is released.
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Accused Products
Abstract
A mechanism for opening or closing a shut-off valve, the mechanism having a valve actuator for moving the valve from a first position to a second position, an urging means, a trigger which, when activated, triggers operation of the valve actuator, the trigger including a retainer which ordinarily holds the shut-off valve in the first position against the force applied by urging means, and a sensor reactive to an external stimulus which releases the trigger upon receiving appropriate external stimulus.
40 Citations
41 Claims
- 1. A mechanism for opening or closing a valve through which a liquid can flow when open, the mechanism having valve actuation means for moving said valve from a first position to a second position under the urging of urging means, trigger means which, when activated, trigger operation of said valve actuation means, said trigger means including retainer means which ordinarily hold said valve in said first position against the force applied by said urging means, and sensor means arranged so as to be displaced by a rise in the level of the liquid when it is suitably contained, whereby displacement of said sensor means provides a stimulus which is transmitted through a mechanical interaction to said trigger means so as to release said trigger means, and wherein said valve actuation means comprises a rotor connected to a spindle adapted for operative association with said valve and said urging means comprises a torsion spring adapted to act on said rotor, and further comprising a locking cap which extends over and around said rotor and holds the torsion spring in a compressed configuration in order to prevent the induction of rotary motion in said spindle until said trigger means is released.
- 14. A valve through which liquid can flow when open including a valve housing provided with at least two passage ports, a passage port closure member rotatable from a first to a second position and valve actuation means for rotating said passage port closure member from said first to said second position under the urging of urging means, trigger means which, when released, trigger operation of said valve actuation means, said trigger means including retainer means which ordinarily hold said valve in said first position against the force applied by said urging means, and sensor means arranged so as to be displaced by a rise in the level of the liquid when it is suitably contained, whereby displacement of said sensor means provides a stimulus which is transmitted through a mechanical interaction to said trigger means so as to release said trigger means, and wherein said valve actuation means comprises a rotor connected to a spindle in operative association with the passage port closure member and said urging means comprises a torsion spring adapted to act on said rotor, and further comprising a locking cap which extends over and around said rotor and holds the torsion spring in a compressed configuration in order to prevent the induction of rotary motion in said spindle until said trigger means is released.
- 16. A hot water system suitable for domestic use associated with a vessel for collecting overflow water comprising a hot water tank, a mains inlet to said hot water tank from a mains supply and an outlet for hot water, said inlet including a shut-off valve having a valve housing provided with at least two passage ports, a first passage port serving as an inlet to said shut-off valve from said mains inlet and a second passage port serving as an outlet from said shut-off valve to said mains inlet, a passage port closure member rotatable from an open position in which flow through said mains inlet is unimpeded to a closed position in which flow through said mains inlet is prevented, valve actuation means for rotating said passage port closure member from an open to a closed position under the urging of urging means, trigger means which, when released, trigger operation of said valve actuation means, said trigger means including retainer means which ordinarily hold said shut-off valve in said open position against the force applied by said urging means, and sensor means arranged so as to be displaced by a rise in the level of water when it is suitably contained, whereby displacement of said sensor means provides a stimulus which is transmitted through a mechanical interaction to said trigger means so as to release said trigger means, and wherein said valve actuation means comprises a rotor connected to a spindle in operative association with the passage port closure member and said urging means comprises a torsion spring adapted to act on said rotor, and further comprising a locking cap which extends over and around said rotor and holds said torsion spring in a compressed configuration in order to prevent the induction of rotary motion in said spindle until said trigger means is released.
- 22. A mechanism for opening or closing a valve through which a liquid can flow when open, the mechanism having valve actuation means for moving said valve from a first position to a second position under the urging of urging means, trigger means which, when activated, trigger operation of said valve actuation means, said trigger means including retainer means which ordinarily hold said valve in said first position against the force applied by said urging means, and sensor means arranged so as to be displaced by a rise in the level of the liquid when it is suitably contained, whereby displacement of said sensor means provides a stimulus which is transmitted through a mechanical interaction to said trigger means so as to release said trigger means, and wherein said valve actuation means comprises a rotor connected to a spindle adapted for operative association with said valve and said urging means comprises two off-set compression springs, each of which acts on a roller-type pin which in turn acts on said rotor.
- 38. A valve through which liquid can flow when open including a valve housing provided with at least two passage ports, a passage port closure member rotatable from a first to a second position and valve actuation means for rotating said passage port closure member from said first to said second position under the urging of urging means, trigger means which, when released, trigger operation of said valve actuation means, said trigger means including retainer means which ordinarily hold said valve in said first position against the force applied by said urging means, and sensor means arranged so as to be displaced by a rise in the level of the liquid when it is suitably contained, whereby displacement of said sensor means provides a stimulus which is transmitted through a mechanical interaction to said trigger means so as to release said trigger means, and wherein said valve actuation means comprises a rotor connected to a spindle in operative association with the passage port closure member and said urging means comprises two off-set compression springs, each of which acts on a roller-type pin which in turn acts on said rotor.
- 40. A hot water system suitable for domestic use associated with a vessel for collecting overflow water, a mains inlet to said hot water tank from a mains supply and an outlet for hot water, said inlet including a shut-off valve having a valve housing provided with at least two passage ports, a first passage port serving as an inlet to said shut-off valve from said mains inlet and a second passage port serving as an outlet from said shut-off valve to said mains inlet, a passage port closure member rotatable from an open position in which flow through said mains inlet is unimpeded to a closed position in which flow through said mains inlet is prevented, valve actuation means for rotating said passage port closure member from an open to a closed position under the urging of urging means, trigger means which, when released, trigger operation of said valve actuation means, said trigger means including retainer means which ordinarily hold said shut-off valve in said open position against the force applied by said urging means, and sensor means arranged so as to be displaced by a rise in the level of water when it is suitably contained, whereby displacement of said sensor means provides a stimulus which is transmitted through a mechanical interaction to said trigger means so as to release said trigger means, and wherein said valve actuation means comprises a rotor connected to a spindle in operative association with said passage port closure member and said urging means comprises two off-set compression springs, each of which acts on a roller-type pin which in turn acts on said rotor.
Specification