Abstract: A controller is provided for a gas valve including a movable valve element, a main diaphragm chamber having a main diaphragm therein coupled to the valve element to displace the valve element relative to a valve opening, and a servo-regulator diaphragm for regulating flow of gas that acts against the main diaphragm, to adjust the valve element and vary the flow rate. A stepper motor is configured to move in a stepwise manner to displace the servo-regulator diaphragm to adjust the valve element and gas flow rate. The controller for the stepper motor includes a microprocessor that receives an input signal indicating an operating capacity level, and determines the steps the stepper motor must move to displace the servo-regulator diaphragm to establish a flow rate corresponding to the operating capacity level. The microprocessor generates a signal to move the stepper motor the number of steps to adjust the gas valve.

Abstract: A valve unit includes a valve member that moves relative to a valve seat in response to a magnetic field generated by a coil. An input signal to the coil controls the extent of movement of the valve member relative to the valve seat, to control a gas flow rate therethrough. The gas valve unit also includes a setting adjustment device that provides a setting adjustment input utilized for calibrating or adjusting at least one gas flow rate. A valve controller is configured to receive an activation signal and to responsively send an input signal to the coil to move the valve member and establish at least one desired gas flow rate corresponding to the activation signal, wherein the valve controller is configured to adjust the input signal to the coil based on the setting adjustment input, to thereby enable field adjustment of at least one gas flow rate.

Abstract: A valve unit for adjusting gas flow to a two-stage combustion apparatus includes a valve member that is moved by a magnetic field generated by a coil to vary gas flow rate through the valve unit, and first and second connectors configured to receive a high-stage activation signal and a low-stage activation signal, respectively. The valve unit includes a valve controller that is configured to control the coil to establish a high-stage gas flow rate while the high-stage activation signal is present, and configured to control the coil to establish a low-stage gas flow rate while the low stage activation signal is present up to a predetermined low stage time limit. The valve controller is further configured to establish at least one gas flow rate between the low-stage and high-stage gas flow rates when the low stage activation signal is present beyond the predetermined low stage time limit.

Abstract: A valve unit for adjusting gas flow to a combustion apparatus includes a valve member that moves relative to a valve seat in response to a signal input to a coil, for varying a high-capacity gas flow rate through the valve unit. The valve unit includes a first opening port, a second opening port that is smaller than the first opening port, and a closure member. The closure member is movable between an open position, in which said high-capacity gas flow rate is communicated via the first and second opening ports to an outlet, and a closed position against the first opening port, in which a low-capacity gas flow rate is communicated via only the second opening port to the outlet. The valve unit includes a solenoid for selectively moving the closure member between the open position and closed position to selectively establish a high-capacity gas flow rate or low capacity gas flow rate.

Abstract: A valve unit includes a valve member that moves relative to a valve seat in response to a magnetic field generated by a coil. An input signal to the coil controls the extent of movement of the valve member relative to the valve seat, to control a gas flow rate therethrough. The gas valve unit also includes a setting adjustment device that provides a setting adjustment input utilized for calibrating or adjusting at least one gas flow rate. A valve controller is configured to receive an activation signal and to responsively send an input signal to the coil to move the valve member and establish at least one desired gas flow rate corresponding to the activation signal, wherein the valve controller is configured to adjust the input signal to the coil based on the setting adjustment input, to thereby enable field adjustment of at least one gas flow rate.

Abstract: A valve unit for adjusting gas flow to a combustion apparatus includes a valve member that moves relative to a valve seat in response to a signal input to a coil, for varying a high-capacity gas flow rate through the valve unit. The valve unit includes a first opening port, a second opening port that is smaller than the first opening port, and a closure member. The closure member is movable between an open position, in which said high-capacity gas flow rate is communicated via the first and second opening ports to an outlet, and a closed position against the first opening port, in which a low-capacity gas flow rate is communicated via only the second opening port to the outlet. The valve unit includes a solenoid for selectively moving the closure member between the open position and closed position to selectively establish a high-capacity gas flow rate or low capacity gas flow rate.

Abstract: A valve unit for adjusting gas flow to a two-stage combustion apparatus includes a valve member that is moved by a magnetic field generated by a coil to vary gas flow rate through the valve unit, and first and second connectors configured to receive a high-stage activation signal and a low-stage activation signal, respectively. The valve unit includes a valve controller that is configured to control the coil to establish a high-stage gas flow rate while the high-stage activation signal is present, and configured to control the coil to establish a low-stage gas flow rate while the low stage activation signal is present up to a predetermined low stage time limit. The valve controller is further configured to establish at least one gas flow rate between the low-stage and high-stage gas flow rates when the low stage activation signal is present beyond the predetermined low stage time limit.

Abstract: A controller is provided for a gas valve including a movable valve element, a main diaphragm chamber having a main diaphragm therein coupled to the valve element to displace the valve element relative to a valve opening, and a servo-regulator diaphragm for regulating flow of gas that acts against the main diaphragm, to adjust the valve element and vary the flow rate. A stepper motor is configured to move in a stepwise manner to displace the servo-regulator diaphragm to adjust the valve element and gas flow rate. The controller for the stepper motor includes a microprocessor that receives an input signal indicating an operating capacity level, and determines the steps the stepper motor must move to displace the servo-regulator diaphragm to establish a flow rate corresponding to the operating capacity level. The microprocessor generates a signal to move the stepper motor the number of steps to adjust the gas valve.

Abstract: A solenoid operated valve is provided that comprises an inlet, an outlet, a valve seat in the flow path between the inlet and the outlet, and a valve member slidably mounted for movement in a direction aligned with but perpendicular to the plane of the valve seat, and a lever having one end in connection with the valve member and a pivotal end that is operable for moving the valve member between its closed and open positions. The solenoid operated valve further comprises a solenoid actuated member having spaced apart first and second surfaces for engaging the pivotal end of the lever to move the valve member between its closed and open position, and a spring for resiliently biasing the solenoid actuated member so that the first surface engages the pivotal end of the lever to move the valve member to a closed position against the valve seat when the solenoid is not energized.

Abstract: A flow valve that provides for control of a fluid flow rate utilizing a first open position and a second open position. Various embodiments of a flow valve having an inlet, an outlet, and a passageway therebetween are provided that comprise a damper element pivotally arranged within the passageway that is movable between a first position in which fluid flow through the passageway is substantially unaffected by the damper element, and at least a second position in which fluid flow through the passageway is substantially reduced by the damper element. An adjustable stop is further provided for adjustably limiting the movement of the damper element to establish the second position of the damper. A moveable operator is provided for moving the damper element between the first position and second position.