Abstract: The invention relates to a flow regulating valve (1) for liquid-conducting heating or cooling systems, consisting of a housing (2) with an inlet (3), an outlet (4), and a connecting piece (13) which is arranged between the inlet and outlet and into which a pressure regulating device (14) that keeps the pressure difference between the pressure regions in front of and behind a flow regulating unit (8) arranged in the connecting piece constant and a spindle (7) with an actuating part protruding out of the housing (2) and with a first throttle element (9) located in the housing (2) are inserted, said first throttle element acting on the flow regulating unit or parts thereof.

Abstract: A valve has a housing with inlet and outlet ports for a liquid, a connector fitting between the ports, a controller in the connector fitting, and first and second flow regulators in the connector fitting. Connection formations on the connector are engaged by an adjuster acting on the first flow regulator while an actuator acts on the manually operable second flow regulator. The controller maintains a differential pressure constant via the first and second flow regulators. The first flow regulator is downstream of the inlet port in a flow direction, followed by the second flow regulator, the controller, and the outlet port. A spindle axially displaceable in the connector fitting has an actuating part that projects out of the connector fitting and a choke element fastened to the spindle and forming part of the first flow regulator. This spindle extends axially through the controller and the second flow regulator.

Abstract: A heating-cooling system has a plurality of users, a piping system subdivided into a plurality of zones in each of which a respective group of the users is connected in parallel, a heater or cooler having a supply line and a return line connected to the zones, a pump connected to the heater or cooler and to one of the lines for flowing a heat-exchange medium through the respective users, and respective flow-control valves connected in each of the zones for controlling flow of the medium therethrough and establishing in the respective zones a respective differential pressure. Flow in the zones is adjusted by controlling the respective valves to make a detected actual value of the differential pressure in the zone correspond to a set-point value previously detected and stored, with the differential pressure across each of the control valves being similarly feedback controlled.

Abstract: The invention relates to a valve combination for regulating the rate of flow or the differential pressure in liquid-conveying heating and cooling systems, consisting of a housing (2) provided with a feed pipe (10), a discharge pipe (11) and a connection pipes (6) arranged between them and a regulator (3) which is arranged axially in the connection pipe (6), wherein the regulator (3) keeps the differential pressure constant at a preset value by means of a first flow regulator (4) also arranged axially in the connection pipe (6) and can be adjusted by an actuating part (8) which projects from the housing (2) and acts on a second seat (24), and by means of a presettable second flow regulator (5) which is arranged axially or coaxially thereto, wherein the flow cross section (9) is adjustable, which is characterized in that, when an actuator (29) that acts on the actuating part (8) is installed, the flow cross section (9) is adjustable by means of a handle (7) not covered by the actuator and that, when the actuato

Abstract: A flow-control valve has a housing having first and second input ports and respective first and second output ports for respective first and second separate fluid streams and formed between the first and second port with first and second valve seats. Respective first and second valve bodies are axially shiftable in the valve seats, and a coupling element connected axially between the valve bodies moves the valve bodies axially jointly. A diaphragm between the first piston and the housing defines an axially inner compartment into which the first input port opens and between the diaphragm and the housing an axially outer compartment. The first valve body is formed with a passage extending through the first valve body and having an axially extending part opening into the outer compartment and a transversely extending part opening into the housing between the first seat and the first output port.

Abstract: A typical flow-control valve has a housing forming a flow passage and a valve seat. An upstream and downstream valve bodies are is engageable with the seat and form upstream and downstream restrictions. A control piston defines therein outer and inner control compartments. This control piston is coupled to the downstream valve body for joint movement therewith. High-pressure and low-pressure conduits connect the outer and inner control compartments to the flow passage upstream of the upstream restriction and to the flow passage between the upstream and downstream restrictions. A connector element or stem connected to the upstream valve body extends through the control piston and has an outer end projecting out of the housing. A pressure reliever between the control piston and the outer end exerts on the connector element a force urging the upstream valve body upstream and generally equal to a pressure differential across the upstream restriction.