This disclosure relates generally to valves, and more particularly, to gas valve assemblies. In one example, a valve leakage test and/or other tests may be performed on a valve assembly including a valve body with a first valve and a second valve, where the valves may be positioned across a fluid path in the valve body with an intermediate volume between the valves. A human machine interface (HMI) may be in communication with the valve assembly to initiate and/or monitor tests on the valve assembly. The HMI may include a start button on a user interface for initiating the tests on valve assembly. The HMI may receive results of the tests (e.g., valve leakage tests) in real time during the test and display the results of the tests on a display of the HMI in real time.

Methods and systems for a fire device, comprising a common fuel line coupled to a fuel source via a first pressure regulator, wherein the first pressure regulator is configured to provide gaseous fuel from the fuel source to the common fuel line at a first pressure. A first fire display device is coupled to the common fuel line via a second pressure regulator, wherein the second pressure regulator is positioned downstream of the first pressure regulator and provides the gaseous fuel to the first fire display device at a second pressure that is lower than the first pressure.

A method of controlling operation of a furnace having a pre-mixed burner, a heat exchanger, and an inducer blower downstream of the heat exchanger includes monitoring a pressure drop across the heat exchanger. The speed of the inducer blower is controlled in response to the monitored pressure drop to thereby control mass flow through the furnace.

A temperature setpoint is reestablished and maintained in a gas oven using multiple gas burners. In some instances, the multiple gas burners may be cycled using predetermined activation durations for each gas burner when reestablishing the temperature setpoint, and in some instances, the gas burners may be cycled over multiple iterations in order to reestablish the temperature setpoint. Furthermore, in some instances, each gas burner may include a spark igniter that may be used to minimize the amount of time required to ignite the gas burner when reestablishing the temperature setpoint.

Cooktop appliances are provided. A cooktop appliance can include a gas burner; a manifold having a gas input; a primary line extending between the manifold and the gas burner, wherein a gas flow rate in the primary line is controllable by a user selectable interface; and a secondary line extending between the manifold and the gas burner, wherein a gas flow rate in the secondary line is controllable by a flow control valve.

A gas burner assembly for a cooktop appliance includes a normally aspirated primary burner and a concentrically-positioned forced air boost burner. A dual-outlet control valve provides a flow of primary fuel to the primary burner through a first outlet and a flow of boost fuel to the boost burner through a second outlet. The boost burner operates by receiving the flow of boost fuel and a flow of combustion air from a forced air supply source only when the primary burner is operating in a low condition.

Systems, methods, and circuitries are provided for a controller for a fuel oil burner system that controls a fuel oil burner to perform intermittent ON cycles. In one example, a controller includes a memory configured to store a value for one or more burner control delay periods and a processor. The processor is configured to perform an auto-set procedure in a first ON cycle. The auto-set procedure includes detecting an oil valve in the fuel oil burner; determining that the value for a burner control delay period is a default value; and in response, storing a valve-present value as the value for the burner control delay period in the memory.

A flue gas analyser for determining the efficiency of a burner burning a supply gas and producing a flue gas by: calculating an efficiency of the burner based on a detected amount of a first target gas in the flue gas and an expected amount of the first target gas in the flue gas; predicting an amount of a second target gas in the flue gas based on the efficiency of the burner; estimating a composition of the supply gas based on a detected amount of the second target gas in the flue gas and the predicted amount of the second target gas in the flue gas; and correcting the calculated efficiency of the burner based on the estimated composition of the supply gas.

The present invention intends to make it hard to distort a diaphragm at the time of assembling in a fluid control valve structured to screw a screw member to a plunger. The fluid control valve that makes an actuator move a valve body installed movably in a contacting/separating direction with respect to a valve seat includes: the plunger that is interposed between the valve body and the actuator to transfer the power of the actuator to the valve body; and the diaphragm connected to the circumferential surface of the plunger. In addition, the plunger includes: a first division body connected to the diaphragm; and a second division body that is arranged on an actuator side of the first division body and to which the screw member is screwed. Further, the second division body is configured to be rotatable with respect to the first division body in its circumferential direction.

Methods and systems for programming and controlling a control system of a gas valve assembly. The methods and systems include programming a control system in an automated manner to establish an air-fuel ratio based at least in part on a burner firing rate. The established air-fuel ratio may be configured to facilitate meeting a combustion constituent set point of combustion constituents in the combustion exhaust. The methods and systems include controlling operation of a combustion appliance based on closed-loop control techniques and utilizing feedback from a sensor measuring combustion constituents in exhaust from a combustion chamber in the combustion appliance. The combustion constituents on which control of the combustion appliance may be determined include oxygen and/or carbon dioxide.