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| Number | Title | Issue Date |
| 7249573 | Pressurized steam boilers and their control A method of controlling the operation of a pressurised steam boiler (50) heated by a burner (20), which includes the steps of a) monitoring the level of water in the boiler (50), b) monitoring the pressure of steam in the boiler (50), c) ... | 07/31/2007 |
| 7219687 | Resettable bi-stable thermal valve A resettable thermal valve for controlling the flow of a fluid therethrough comprises a valve assembly housing having a fluid passageway therethrough and a valve coupled to the valve assembly housing and disposed at least partially within the fluid passageway. The v... | 05/22/2007 |
| 7134452 | Disc valve A disk valve comprises an inlet port, an outlet port, a first disk provided with a first through hole communicating with the inlet port and extending axially and a second through hole communicating with the outlet port and extending axially, and a second disk provid... | 11/14/2006 |
| 6754541 | Control system apparatus for loading a value of a system parameter and preventing change thereto after a period of time A control system for controlling an operating system stores a system parameter such as an ultimate pressure value, for an operating system. The control system allows operation of the operating system only after an initial value of the system parameter has been loade... | 06/22/2004 |
| 5875807 | Flow control especially for instantaneous water heater Fitting, especially for a continuous flow water heater. The submitted invention takes as its basis the problem of developing a fitting of the named type by which the formation of calcareous deposits on the rod protruding from the water control housing is lesse... | 03/02/1999 |
| 5297535 | Ignition device for water heaters This invention relates to an ignition device for water heaters and in particular to one including a body portion, a water container including a diaphragm fixedly mounted on the bottom of the body portion and having a lift rod extending into the body porti... | 03/29/1994 |
| 5224445 | Boiler water liquid level control A liquid level control principally for boiling water boilers sensitive to the presence or absence of liquid at an upper and at a lower control level. The control enables the boiler to be fired when liquid is at or above the upper level. It prevents firing... | 07/06/1993 |
| 4655239 | Water-pressure-operated gas valve for instantaneous gas water heater A water-pressure-operated (i.e., faucet-controlled) gas valve of an instantaneous water heater which opens and closes a gas passage to a main burner in accordance with the pressure of supplied water, resulting from the use of adjusting screws in first and... | 04/07/1987 |
| 4465088 | Construction of low water level sensing device for hot water boiler A low liquid level sensor in a hot water heating system permitting testing operability thereof in situ without draining down the system. The sensor is located in a cavity that has an opening in the bottom thereof in fluid communication with the liquid in ... | 08/14/1984 |
| 4383544 | Boiler low water level sensing device A low liquid level sensor in a hot water heating system permitting testing operability thereof in situ without draining down the system. The sensor is located in a cavity that has an opening in the bottom thereof in fluid communication with the liquid in ... | 05/17/1983 |
| 4335848 | System of central heating A system for improving efficiency and effecting fuel conservation in buildings with multiple units heated by forced hot water from a central gas-fired boiler. Each unit or apartment is provided with a circulator pump in the return water pipe and an associ... | 06/22/1982 |
| 4304249 | Control units A control unit for a gas-fired water heater comprises a resiliently-loaded main valve for controlling gas flow to a gas burner of the heater, the main gas valve being opened and closed by a flexible diaphragm exposed to pressure of water flowing through t... | 12/08/1981 |
| 4180088 | Water shutoff system Water supply line to the home has a water flow sensor therein and a valve therein. When water flow is sensed, the valve is turned off, as when a leak occurs. Such a leak may be caused by failure of a component in the system, such as a burst pipe or leaky ... | 12/25/1979 |
| 3931712 | Internal combustion engine turbocharger pressure control regulators This invention provides a differential pressure-activated control system having non-mechanical, remotely controllable, biasing means. The system comprises a differential pressure sensing means, having opposing first and second pressure sensing portions, a... | 01/13/1976 |
