Abstract: A valve actuator (10) includes an electric motor (12) that opens, and also closes if need be, the valve via a gearing (15). A voltage supply device (19) has an input rectifier circuit and a buffer device (24) connected thereto, for example in the form of a capacitor C. From the voltage buffered by the capacitor C, a motor control circuit (25) obtains the energy for operating the electric motor (12). To prevent the valve (11) from being kept open too long after the voltage supply at the input (20) has been switched off, a switch-off device (34) is provided, which, after elimination of the voltage at the input (20), cuts off the energy flow from the voltage buffer device (24) to the electric motor (12).

Abstract: The valve series includes a plurality of valve types (A, B, C) with valves of different size and type, wherein a plurality of valve types, preferably all valves types (A, B, C) of the valve series (11) have uniform valve actuators (21), wherein the valve closure members (19) of the valves (10, 12, 13) perform the same opening stroke, wherein they can be formed differently, however, and in particular can have different diameters. The closing springs (20) of the different valve types (A, B, C) can also have different characteristic curves and can be of different thicknesses.

Abstract: A valve actuator (10) has a damping circuitry including a capacitive damping circuit (37), which is activated in the event of generator operation of the stepper motor (18). The damping circuitry, together with the motor winding (26), forms a resonance assembly LCR, which has the effect of stabilising and regulating rotational speed. The rotational speed of the stepper motor (18), running in generator operation, is held constant within limits, specifically without the control intervention of control circuitry. Therefore, the damping circuitry can operate even in the currentless state of the control system and is reliable regardless of external current supply. Fast closing is achieved, and excessively long post-running of the motor (18) is reliably prevented.

Abstract: The valve series includes a plurality of valve types (A, B, C) with valves of different size and type, wherein a plurality of valve types, preferably all valves types (A, B, C) of the valve series (11) have uniform valve actuators (21), wherein the valve closure members (19) of the valves (10, 12, 13) perform the same opening stroke, wherein they can be formed differently, however, and in particular can have different diameters. The closing springs (20) of the different valve types (A, B, C) can also have different characteristic curves and can be of different thicknesses.

Abstract: A method and an apparatus for determining the calorific value parameter describing the calorific value of a gaseous fuel. The apparatus comprises a test burner with a test combustion chamber. An air ratio sensor is arranged in an exhaust gas duct of the test burner and measures an air ratio signal that corresponds to the air ratio of the exhaust gas. As a function of the received air ratio signal, at least one setting signal is generated for a test supply unit via a test control unit. The setting signal controls the amount and/or the proportion of a gaseous fuel or an oxygen-containing gas that is supplied to the test combustion chamber. A calorific value sensor arrangement is provided in the combustion chamber and has an ionization sensor and, a temperature sensor. The sensor signal of the calorific value sensor is transmitted to a determination unit.

Abstract: The control actuator in accordance with the invention comprises a first part with a first wall arrangement and a bottom that circumscribe an inflow volume. The first wall arrangement comprises at least one flow opening through which fluid from the inflow volume can flow. Furthermore, the control actuator comprises a second part with a second wall arrangement that is arranged so as to be adjustable along the first wall arrangement. As a result of this, the fluid flow through a flow opening can be gradually cleared or limited. Preferably, the bottom is arranged in such a manner that the bottom breaks a basic inflow direction Se into the inflow volume and shields the second part against inflow pressure surges.

Abstract: The presented valve (1) is based on two axially adjustable sleeve-shaped valve seat rings (14, 36) that are associated with locking arrangements in the form of annular armature plates (22, 35) and associate holding coils (24, 36). The valve closure member (39) can be variably adjusted via a position adjustment drive. Said valve closure member has a double function. On the one hand, it acts to move the valve seat rings (14, 26) into locking position and, on the other hand, it acts to control the gas flow.

Abstract: The presented valve (1) is based on two axially adjustable sleeve-shaped valve seat rings (14, 36) that are associated with locking arrangements in the form of annular armature plates (22, 35) and associate holding coils (24, 36). The valve closure member (39) can be variably adjusted via a position adjustment drive. Said valve closure member has a double function. On the one hand, it acts to move the valve seat rings (14, 26) into locking position and, on the other hand, it acts to control the gas flow.

Abstract: The present invention provides a gas valve arrangement having at least one main valve that has a valve closure element which is connected with a fluid-actuated drive device. A pilot valve is connected to the drive device so as to control it by a pilot fluid flow, and which has a piezoelectric actuation element for influencing the pilot fluid flow. A control device is connected with the pilot valve and acts on it with an alternating voltage so as to open the main valve.

Abstract: A valve assembly comprises two valves and a single solenoid actuator with only one magnetizing coil that controls both valves. The corresponding magnetic circuit comprises a yoke with only two pole pieces. The valves are arranged concentric to one another. The valve closing element of the outer valve is connected to an armature by means of a sleeve. The cup thus formed receives the armature that is connected to the valve closing element of the inner valve. The pole piece and the armature form a transmission air gap through which the sleeve extends. A coupling air gap is formed between the armatures. The armature and the pole piece form a working air gap. The valves are opened collectively and are able to close independently of one another when the coil is rendered currentless.

Abstract: For adjustment of a desired burner gas-air ratio over the broadest possible load range without additional pressure tapping of the burner, combustion chamber, or air lines, a ratio controller is provided that permits adjustment of the gas flow as a function of counterpressure. For adjustment, the ratio controller has at least one position-variable measurement site, or at least two measurement sites, connected directly or indirectly via a pilot valve, to an actuating diaphragm via a valve block or throttle valve block. Depending on whether the control pressure is picked up more from one or more from the other measurement site, the gas flow and therefore the gas-air ratio can be adjusted to be larger or smaller.