A premixing apparatus includes a mixing unit, an air supply adjusting unit, and a gas switching unit. The mixing unit draws a fuel gas in the mixing unit by supplied air to mix the fuel gas and the supplied air with each other. The air supply adjusting unit applies a load on the supplied air flowing toward the mixing unit and switches the load. The gas switching unit switches a gas amount of the fuel gas to be supplied to the mixing unit.

A premixing apparatus includes a mixing unit, an air supply adjusting unit, and a gas switching unit. The mixing unit draws a fuel gas in the mixing unit by supplied air to mix the fuel gas and the supplied air with each other. The air supply adjusting unit applies a load on the supplied air flowing toward the mixing unit and switches the load. The gas switching unit switches a gas amount of the fuel gas to be supplied to the mixing unit.

A gas delivery apparatus has a delivery pipe that extends from a gas entrance end to a gas delivery end along which an entrance component, a pressure regulator and a flow rate regulator are present, coordinated with each other in order to supply on each occasion the desired quantity of gas to a burner of an apparatus fed with gas. or p with an air-gas mixture.

A system to reduce standby losses in a hot water heater is presented. The system utilizes a dual safety relay valve between the combination gas controller and the burner. The dual safety relay valve bypasses gas to a rotary damper actuator valve to position a damper flapper valve located over/inside the flue pipe. Once the flapper valve has opened to ensure combustion, the gas is allowed to flow back to the dual safety relay valve. Some of the bypass gas may be diverted to boost the pilot or to supply a booster. The dual safety relay valve is then opened to allow the gas supply to the burner. Once the burner is turned off, bypass gas bleeds out of the rotary damper actuator valve to close the damper flapper valve to reduce standby losses through the flue pipe, and to allow the dual safety relay valve to close tightly.

Systems and methods are described related to a premix combustion system used in a furnace system. Prior systems have to create a negative pressure in the premix chamber to draw gas into the chamber. Embodiments under the current disclosure can use an amplifier that is pneumatically coupled to an air supply and a secondary location (besides the gas valve). Coupling to the amplifier to a location apart from the gas valve allows the system to avoid a negative pressure in the mixing chamber. The amplifier can apply an amplified pressure or signal to a gas valve regulator and thereby raise the gas pressure so that the gas supply is driven into the premix chamber.

A gas valve actuator for a gas valve. The gas valve actuator includes a non-conductive support bobbin and an insulated copper wire wound about the support bobbin to form a coil. A magnetic flux concentration member extends through the non-conductive support bobbin. To actuate the gas valve actuator, a current is passed through the coil, which produces a magnetic field that actuates an armature to move a valve seal away from a valve seat of the gas valve. Because the gas valve actuator may be exposed to a gas stream, the coil may be coated with an anti-corrosion coating through a spray or brush process, a potting process, through a dipping process, or in any other suitable manner.

A device for controlling a combustible gas supply to a heating apparatus burner includes: a valve with a respective valve seat which is associated with a corresponding closure member provided with a respective control rod for opening the valve seat, a system for amplifying movement of the control rod which has a snap-fit spring which acts on the rod and a pushing element which in turn acts on the spring, a first end of a lever acts on the pushing element which is hinged at a fulcrum location which is positioned at an opposing second end of the lever, actuator which moves the lever, operationally associated with the lever in a position between the opposing lever ends to control the lever about the fulcrum location resulting in movement of the closure member away from and towards the valve seat, the actuator comprising a linear actuator element with converse piezoelectric effect.

A fluid regulator having a valve body defining an inlet, an outlet, a loading port, an access port, and a loading chamber disposed within the valve body and coupled to the loading port. A valve assembly is at least partially disposed between the inlet and the outlet and in communication with the loading chamber and is adapted to cooperate with the loading chamber to adjust fluid flow at the outlet by adjusting a fluid flow rate between the inlet and the outlet. A restrictor is at least partially disposed within the access port and the loading chamber and the valve assembly are adapted to be responsive to a change in loading pressure such that a modified rate is achieved and the restrictor is adapted to adjust a response speed in which the modified rate is achieved.

A pressure regulator is described. The pressure regulator includes a diaphragm, a vent limiting component, a relief valve stem, and a main spring. The diaphragm has an inner edge that defines a main relief opening. The vent limiting component is positioned within the main relief opening and adjacent to an upper side of the diaphragm about the inner edge. The vent limiting component defines an orifice, wherein the lower side of the diaphragm is in fluid communication with the upper side of the diaphragm through the orifice. The relief valve stem is positioned adjacent to a lower side of the diaphragm about the inner edge. The main spring is configured to provide a force to the vent limiting component to removably secure the vent limiting component to the diaphragm.

A heater assembly can be used with a gas appliance. The gas appliance can be a dual fuel appliance for use with one of a first fuel type or a second fuel type different than the first. The heater assembly can include a pressure sensor and a plurality of valves operable by a control module dependent upon a detected fuel pressure. The valves may be solenoid valves that can reduce the available fuel delivery paths to limit fuel delivery to a burner when a higher pressure, such as detection of LP gas, is detected.