Abstract: An adjustable differential pressure control valve has a first housing part with one or more fluid entry openings and one or more fluid exit openings. The valve is provided with a movable throttle member configured for regulating the through flow area of the exit openings in response to a difference in pressure across the throttle member, and a spring arrangement configured for providing a spring force acting on the throttle member in a direction that increases the through flow area of the exit openings. The spring arrangement comprises at least a first and a second spring, and the spring arrangement is adjustable to operate in a low pressure mode with the spring force acting on the throttle member being provided by the first spring only, and to operate in a high pressure mode with the spring force acting on the throttle member being provided by at least both the first and second springs.

Abstract: An adjustable differential pressure control valve has a first housing part with one or more fluid entry openings and one or more fluid exit openings. The valve is provided with a movable throttle member configured for regulating the through flow area of the exit openings in response to a difference in pressure across the throttle member, and a spring arrangement configured for providing a spring force acting on the throttle member in a direction that increases the through flow area of the exit openings. The spring arrangement comprises at least a first and a second spring, and the spring arrangement is adjustable to operate in a low pressure mode with the spring force acting on the throttle member being provided by the first spring only, and to operate in a high pressure mode with the spring force acting on the throttle member being provided by at least both the first and second springs.

Abstract: A control valve for controlling liquid flow in a heating and/or cooling installation. The control valve includes differential pressure regulating facilities and flow area regulating facilities. The control valve is provided with means for manually presetting a maximum flow through area and with means for automatically adjusting the flow through area within the preset maximum.

Abstract: A control valve for controlling liquid flow in a heating and/or cooling installation under command from an actuator within a range defined by a manually preset maximum. The control valve includes differential pressure regulating facilities and flow area regulating facilities. The control valve is provided with means for manually presetting a maximum flow through area and with means for automatically adjusting the flow area through area within the preset maximum.

Abstract: A control valve (1) for controlling liquid flow in a heating and/or cooling installation under command from an actuator. The control valve (1) comprises a flow regulator with a first annular valve member (20) and a second annular valve member (40) that have an axial overlap. The first valve member (20) is manually rotatable relative to the second valve member (40). The axially overlapping portions of the valve members (20,40) define a first inlet opening (52) with a variable circumferential extent and a second inlet opening (53) with a variable circumferential extent. The first inlet opening (52) is axially offset relative to the second inlet opening (53). A third valve member (24) is axially displaceable by the actuator relative to the first- and second inlet openings (52,53) and defines a first control edge (26) associated with the first inlet opening (52) and defines a second control edge (27) associated with the second inlet opening (53).

Abstract: A control valve (1) for controlling liquid flow in a heating and/or cooling installation.

Abstract: An adjustable regulator insert (1) for valves, in particular for controlling liquid flow in a plant for central hearing or air-conditioning, which insert (1) comprises an inflow opening (10) and an outflow opening (20). The area of at least one of said openings (10,20) is adjustable, said at least open opening being defined by an overlap between a first flow passage (16) in a first plate shaped element and a second flow passage (15) in a second plate shaped element. The first and second plate shaped elements are displaceable relative to each other, such that said first flow passage (16) and second flow passage (15) in the two plates are displaceable relative to each other in order to vary the area of said opening. The second plate shape element is displaceable in two different directions, such that the displacement in one direction can be adjusted independently of the displacement in the other direction.