APPARATUS FOR CONTROL OF PRESSURE AND FLOW, RESPECTIVELY, IN COOLING OR HEATING SYSTEMS

摘要

A device (100) for pressure and flow control of a cooling or heating system (101-105) comprises a valve device (1), which has a house (2) with one connection piece (3) for incoming supply medium, one connection piece (4) for outgoing supply medium, a continuously open passage (24) connecting said connection pieces (3, 4), one connection piece (5) for incoming return medium and one connection piece (6) for outgoing return medium, a control valve (7), upon which a compression spring (16) acts, acting from the outlet side (6) of the return medium aginst its inlet side (5). In accordance with the invention the control valve (7) is hollow with a piston spindle (38), which at one of its ends supports a piston part (14), which constitutes a part of the control valve, and at its other end, which is exposed to said passage (24), and centrally a membrane device (9, 44), which comprises a control room (60), which via cavities (58, 59, 61) in the piston part (14) and in the piston spindle (38) communicates with the return inlet side.