초록 ▼

The invention relates to a differential pressure valve for the control of a plant with a heat carrying medium. The differential pressure valve has a membrane controlled by a differential pressure for the regulation of the flow of the heat carrying medium between an inlet and an outlet, an adjustable

The invention relates to a differential pressure valve for the control of a plant with a heat carrying medium. The differential pressure valve has a membrane controlled by a differential pressure for the regulation of the flow of the heat carrying medium between an inlet and an outlet, an adjustable closing member between the inlet and the membrane, one or more fixed openings, the areas of which can be changed linearly by the closing member, one or more variable openings, the areas of which are changed by the membrane, and electrically activated members for closing one of the variable openings or fixed openings by force or by time control independently of the flow in the valve. The invention is configured as parts to be inserted in a known differential pressure valve without dismounting it in such a plant. It is the object of the invention in very small steps to control the flow in the whole plant, in a single part thereof or in several sections of a cooling or heating plant, each section being divided into zones.

대표청구항 ▼

[ We claim:] [8.] In a method for zone regulation of a heating/cooling plant including the steps of circulating a heat carrying fluid medium from a supply piping, through at least one heat exchanger in each of a plurality of rooms in a building, to a return piping; and regulating flow of the heat ca

[ We claim:] [8.] In a method for zone regulation of a heating/cooling plant including the steps of circulating a heat carrying fluid medium from a supply piping, through at least one heat exchanger in each of a plurality of rooms in a building, to a return piping; and regulating flow of the heat carrying fluid medium with a differential pressure valve placed in the return piping, said differential pressure valve having a membrane (8) controlled by a differential pressure for the regulation of the flow of the heat carrying medium between an inlet (5) and an outlet (11), an adjustable closing member (1) between the inlet (5) and the membrane (8), one or more fixed openings (7), the areas of which can be changed linearly by the closing member (1) to preset the flow, and one or more variable openings (9), the areas of which are changed by the membrane (8), the improvement comprising:maintaining a hydraulic balance in the plant by closing one of the variable openings (9) or fixed openings (7) by force or time control independently of the flow in the valve with electrically activated members (25, 26; 20).