The control valve according to the invention is for use in liquid-carrying systems. It comprises a valve housing (1) having an inlet side (17) and an outlet side (18), said valve housing being provided with a pressure maintaining arrangement for maintaining a constant differential pressure between the inlet and outlet sides, as well as an amount control arrangement for setting the maximum flow amount through the valve and adjustment of it. The control arrangement comprises two cylinder shell elements (2 and 3) cooperating in the flow path, both having material removed from otherwise overlapping areas, thereby generating an uncovered area (25) in the flow path of the control valve. The outer cylinder shell element (3) is stationarily rotatable relative to the valve housing, while the inner cylinder shell element (2) may be rotated by means of a rotatable handle (13), whereby a larger or smaller opening (25) between the cooperating cylinder shell elements (2 and 3) may be provided. Both cylinder shell elements (2 and 3), which cooperate with the seat hole (8) of the valve housing, may also be displaced (26) in the axial direction, resulting in an increase or a decrease of the generated opening (25). Thereby, the flow amount may be adjusted prior to the presetting, e.g. by means of an actuator.

A control valve

A multifunctional restrictive valve for controlling the flow of water therethrough. The valve has a main body with a flow channel through the main body. The main body receives water upstream thereof through an inlet port and passes it out through an outlet port at the downstream end of the body. A flow control assembly is located in the flow channel and includes a temperature sensor/actuator acting on a piston to move, when the temperature sensor heats up the piston, to block water flow control ports. The flow control assembly also includes an override feature wherein the piston is located within a slide and the flow control ports are located in the slide. By moving the slide away from the piston when the piston is blocking the flow control ports, the temperature sensor and piston may be overridden and flow may resume through the main body.

Multifunctional restrictive valve

The valve (1) has a housing (2) with a fluid inlet (3) and outlet (4) in line with each other. A control valve (5) between the inlet and outlet has a valve body (7) engaging a valve seat (6) and moved by a spindle (9) and a spring (10). An actuating screw (11) engages in a bush (12). The valve assembly may contain a thermostat and incorporates a pressure regulating valve (14) with an opening spring (18). A valve element (17) engages a valve seat (16) and the valve includes a membrane (21).

Control valve for heat exchanger or heater has valve body screwed onto seat by spindle and has pressure regulating valve with opening spring and diaphragm

A thermostatic mixing valve contains a control bush, which can be displaced by an expansion element, which is exposed to the mixing water temperature. As a function of the mixing water temperature and the set desired temperature, the control bush is displaced for simultaneously opening the hot water supply and closing the cold water supply or vice versa. According to the invention there are two control openings for the cold water and two control openings for the hot water.

Thermostatically controlled mixing valve

A valve arrangement (1) for controlling a flow of a heating or cooling fluid is provided, said valve arrangement (1) comprising: a housing (2) having an inlet (3) and an outlet (4), a pressure regulating valve (11) being arranged between said inlet (3) and said outlet (4) and having a regulating valve element (12) and a regulating valve seat (13), said regulating valve element (12) being connected to a membrane (15), said membrane (15) having a flexible part (17) and being loaded on one side by an inlet pressure at the inlet (3) and on the opposite side by an outlet pressure at the outlet (4). In such a valve arrangement the risk of damages should be reduced. To this end a membrane supporting structure (25, 27, 28) is provided, said supporting structure (25, 27, 28) supporting said flexible part (17) of said membrane (15) when a force or a pressure acting on the membrane (15) exceeds a predetermined value.

Valve arrangement for controlling a flow of a heating or cooling fluid

Energy exchanger valve (8) with thermostat valve (12), a housing (9) with inlet (20) and outlet (21), a thermostat bellows displaceable spindle (30) with seal (42) which, by the expansion/contraction of the thermostat bellows and against the pressure of a surrounding spring (31) can close/open an opening (27) with a seating (27a) in a transverse wall (24) between the inlet (20) and the outlet (21), and a piston (13) controlled by differential pressure for the control of a medium's differential pressure across a pre-setting (11) and a thermostat valve (12) consisting of the seating (27a) and the seal (42) between the inlet (20) and the piston (13), the thermostat valve (12) being able to cut off the flow between the inlet and the outlet independently of the pre-setting (11). With the valve (8), only a predetermined maximum amount of the energy-carrying medium flows through the energy exchangers (5). If the differential pressure is increased when the valves on a pipe length are closed, the flow in the individual energy exchangers (5) is not increased.

Ole Joergensen

Papers

Valve for a system having an energy-carrying medium