According to one embodiment a valve arrangement for a gas burner is provided that includes a manual gas valve with a manual actuator for opening or closing the gas flow, and an electromagnetic valve having a movable closure member which allows opening or closing a gas passage to the burner. The electromagnetic valve is arranged in the gas valve, with the manual actuator being coupled to a rotary flow regulating element, the manual actuator being configured in order to move the closure member of the electromagnetic valve, opening the gas passage, the manual gas valve including a reduced gas flow channel which puts the inlet conduit in fluid communication with the regulating element regardless of the position of the closure member.

A combustion staging system is provided for fuel injectors of a multi-stage combustor of a gas turbine engine. The system has a splitting unit which receives a metered total fuel flow and controllably splits the metered total fuel flow into out-going pilot and mains fuel flows to perform pilot-only and pilot-and-mains staging control of the combustor. The system further has pilot and mains fuel manifolds which respectively receive the pilot and mains fuel flows. The system further has a plurality of mains flow scheduling valves which distribute the mains fuel flow from the mains fuel manifold to mains discharge orifices of respective injectors of the combustor. The system further has servo line which extends to the mains flow scheduling valves, the servo line being controllably fillable with pressurised fuel to change the pressure in the servo line relative to the pressure in the mains fuel manifold. Each mains flow scheduling valve has a chamber containing a movable piston, the chamber to a mains side of the piston being fed by the mains fuel manifold, and the chamber to a servo side of the piston being fed by the servo line. The piston has an open pilot-and-mains position which allows flow out of the mains side of the chamber to the mains discharge orifice of the respective injector. The piston is biased towards a closed pilot-only position which prevents flow out of the mains side of the chamber to the mains discharge orifice of the respective injector. The piston is movable to the closed position under an increase in pressure in the servo line relative to the mains fuel manifold.

Flow modulator (10) for a fluid like combustion gas, comprising: a housing (11), a modulator body (14) positioned with the housing (11), and a valve body (18) positioned with the housing (11). The modulator body (14) has a flow channel (15) and an opening (16) providing together a flow passage (17) for the fluid. The valve body (18) is provided by a foil element (19), wherein the foil element (19) has an opening (20) for the fluid, wherein the foil element (19) is rotatable relative to the modulator body (14) to modulate the flow of the fluid by adjusting an overlap between the opening (20) of the valve body (18) and the flow passage (17) of the modulator body (14), and wherein the foil element (19) is positioned up-stream of the modulator body (14) such that an inlet pressure of the fluid presses the foil element (19) against the modulator body (14) thereby providing a sealing level between the foil element (19) and the modulator body (14).

A water heater control system comprising an energy storage system electrically connected to a pilot valve operator and electrically isolated from a main valve operator. The energy storage system may be electrically connected to an ignition circuit. A thermoelectric device is in thermal communication with the pilot flame and electrically connected to a main valve operator. The water heater system may include a microcontroller configured to establish electrical communications between the device and the energy storage system, the pilot valve operator, and the main valve operator. The microcontroller may be configured to recognize a call for main burner operation, and may also be configured to check an available voltage of the energy storage system against a setpoint. The microcontroller may establish pilot flame operation with or without main burner operation, depending on whether a call for heat or recharging of the energy storage system is required.

An injet for a gas burner includes a first gas orifice and a second gas orifice. An injet body defines an air passage and a gas passage. The first and second gas orifices are mounted to the injet body. A pneumatically actuated gas valve blocks a flow of gaseous fuel through the gas passage to the second gas orifice in a closed configuration. The pneumatically actuated gas valve is configured to adjust from the closed configuration to an open configuration in response to a flow of air through the air passage. A flow restriction body is disposed upstream of the pneumatically actuated gas valve. The flow restriction body defines a through hole via which air is flowable to pneumatically actuated gas valve.

Portable grills are disclosed. An example portable grill movable between an erected configuration and a collapsed configuration includes a valve and regulator assembly and a tank blocker. The valve and regulator assembly includes a tank connector configured to removably couple a fuel tank to the valve and regulator assembly. The tank blocker is configured to prevent the portable grill from being moved from the erected configuration into the collapsed configuration when the portable grill is in the erected configuration and the fuel tank is coupled to the tank connector.

Portable grills are disclosed. An example portable grill movable between an erected configuration and a collapsed configuration includes a frame, a leg unit, and a leg lock assembly. The leg unit is movably coupled to the frame. The leg unit includes a first leg and a second leg spaced apart from the first leg. The leg lock assembly is operatively coupled to the leg unit and located partially within the frame. The leg lock assembly is configured to lock the leg unit in a first position relative to the frame when the portable grill is in the erected configuration, and to unlock the leg unit from the first position to enable movement of the portable grill from the erected configuration into the collapsed configuration.

Portable grills are disclosed. An example portable grill movable between an erected configuration and a collapsed configuration includes a frame, a cookbox, a lid, and a lid lock assembly. The cookbox is coupled to the frame. The lid is movably coupled to the cookbox. The lid is movable relative to the cookbox between a closed position and an open position. The lid lock assembly is coupled to the frame. The lid lock assembly is configured to enable movement of the lid from the closed position into the open position when the portable grill is in the erected configuration, and to lock the lid in the closed position in response to the portable grill being moved from the erected configuration into the collapsed configuration.

Portable grills are disclosed. An example portable grill movable between an erected configuration and a collapsed configuration includes a frame and a leg unit coupled to the frame. The leg unit includes a first leg, a second leg spaced apart from the first leg, and a foldable foot pivotally coupled to and extending between the first and second legs. The foldable foot is movable relative to the first and second legs between an unfolded configuration and a folded configuration. The foldable foot contacts an underlying surface to support the portable grill when the foldable foot is unfolded and the portable grill is erected and oriented horizontally relative to the underlying surface. The foldable foot provides a handle by which the portable grill can be picked up when the foldable foot is folded and the portable grill is collapsed and oriented horizontally relative to the underlying surface.

Portable grills are disclosed. An example portable grill movable between an erected configuration and a collapsed configuration includes a frame and a leg unit coupled to the frame. The leg unit includes a first leg, a second leg spaced apart from the first leg, and a support bar coupled to and extending between the first and second legs. The support bar further extends at an angle away from the first and second legs. The support bar is configured to contact an underlying surface to support the portable grill when the portable grill is in the collapsed configuration and oriented horizontally relative to the underlying surface. The support bar is further configured to provide a handle by which the portable grill can be hung when the portable grill is in the collapsed configuration and oriented vertically relative to the underlying surface.