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| Number | Title | Issue Date |
| 6857577 | Thermally powered VAV diffuser and control assembly A thermally powered VAV diffuser assembly (21, 221) having a housing (42, 242) formed for coupling to a supply air duct or conduit (22, 222), a damper (24, 224) mounted across a supply air opening (27, 227) for movement relative th... | 02/22/2005 |
| 6702187 | Air diffuser A diffuser (10) for controlling flow of air in an air conditioning system, the diffuser comprising two temperature sensitive elements (20, 22) for respectively sensing room temperature and duct temperature variations. The elements (20, 22) are axially ali... | 03/09/2004 |
| 6634322 | Heat exchanger tempering valve An automatic heat exchanger tempering valve designed to maintain a consistent temperature of a fluid within a machine. The tempering valve is configured to sense fluid temperature and in response, to proportion the flow of the fluid from the machine betwe... | 10/21/2003 |
| 5556027 | Hydronic heating outdoor temperature reset supply water temperature control system A hydronic heating system having a source of hot supply water and a reservoir of cooler return water, a supply water line from the source, a return water line to the reservoir and at least one heating loop through which water flows from the supply line to... | 09/17/1996 |
| 5065595 | Thermostatic expansion valve This thermostatic expansion valve (12) is intended for use in a refrigeration system (10) which includes a compressor (14), a condenser (16) and an evaporator (18). The valve (12) includes a valve body (20) having an inlet (26) and an outlet (28). A valve... | 11/19/1991 |
| 4955431 | Cooling device for an internal combustion engine and method for controlling such a cooling device A device and method for cooling an internal combustion engine is disclosed in which a simple control circuit constructed of relatively inexpensive components enables the rotational speed of an electric motor employed in the cooling device to be controlled... | 09/11/1990 |
| 4648246 | Arrangement for determining the difference between differing and changing temperatures for activating a control, regulating, measuring or recording process and the application of the arrangement in a heat counter The interior of two metallic bellows is in fluid connection through capillary tubes with temperature sensors. The temperature sensors are located in places whose relative temperature difference should be determined. In the presence of a temperature differ... | 03/10/1987 |
| 4497438 | Adaptive, modulating boiler control system A non-electrical thermo-mechanical control system for a hot water heating system having a modulating burner in the boiler. The thermo-mechanical control system simultaneously controls fuel and air supply to the burner in dependence on the temperature diff... | 02/05/1985 |
| 4294402 | Control devices for heaters Control devices for heating installations are disclosed, which heating installations are provided with thermostat controls. The control devices sense the temperature of the heating medium, e.g., water, to be passed to the heating installation and to be re... | 10/13/1981 |
| 4215816 | Thermally controlled valve with safety inspection feature Thermal actuating or like apparatus in which a sight conduit is comprised in a valve housing enabling the changing position of a thermal actuator within the housing to be observed from outside the housing. A fiber optic device acts as the sight conduit an... | 08/05/1980 |
| 4203545 | Thermostatically responsive valve mechanism A thermostatically responsive valve bypass mechanism includes a piston slidably mounted in a bypass channel through a valve member. The piston is normally spring biased to a first closed position. A heat transmissive probe is attached to the valve member ... | 05/20/1980 |
| 4165034 | Fluid mixing valve construction and method of making the same A fluid mixing valve construction having a housing provided with a pair of inlets respectively interconnected by a pair of valve seats to an outlet and with a valve member operated by a condition responsive unit for controlling the valve seats in accordan... | 08/21/1979 |
| 4155504 | Thermostatic ventilator actuator A thermostatic ventilator operator has a thermostatic actuator consisting of a pair of tubes telescoped together with a plurality of thermally responsive power elements arranged coaxially therein. An operating lever is pivoted on a mounting bracket. The t... | 05/22/1979 |
| 4114682 | Apparatus for heating, cooling or air-conditioning a room The invention relates to apparatus for heating and/or cooling a room which is large enough to require at least two heat exchanger units. Controls are provided which dependingly relate the outgoing air stream temperatures of the heat exchangers to avoid th... | 09/19/1978 |
| 4054859 | Flame probe A flame probe for use in an automatic pilot ignition system includes both a thermally responsive flame switch and a sensing electrode located in the flame for use in a flame conductivity sensing circuit. Separate conductive paths are provided for the flam... | 10/18/1977 |
| 4017027 | Lead-lag compensated temperature sensor A lead-lag compensated gas-filled temperature sensor having an output which essentially matches, without error, the temperature of a flowing airstream in a gas turbine engine during both transient and steady state conditions comprises a pair of gas-filled... | 04/12/1977 |
| 3994269 | Multistep fluid control valve The multistep fluid control valve comprises a valve case having a plurality of valve seats. A valve stem is provided in the valve case and is capable of being continuously or stepwise displaced axially. At least one valve body is shiftably mounted on the ... | 11/30/1976 |
