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Special types of control valves

On-off valve

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An A 2 way on-off valve is a 2 way control valve that only has two operationg positions: ‘fully open' and ‘fully closed’. It’s therefore usually not used to control the end units, but rather the production units. Whenever a boiler or heatpump is activated/deactivated, the on-off valve will be opened/closed.

A 3 way on-off valve behaves similarly. If one of the control ports is ‘fully open’, the complementary port is ‘fully closed’. It can be used to switch between production units or between consumption units.

Radiator valve

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A (thermostatic) radiator valve is a 2 way control valve typically used to control the flow going to a ‘radiator/convector’ end unit BC. The ‘radiator valve’ BC models the pressure drops over the valve much more in detail. This block is therefore mainly used in a technical/detail study. For conceptual studies, it's rather adviced to use a ‘throttle circuit’ BC. This is especially true whenever the ‘radiator/convector’ BC is used to represent a larger group of radiator end units, as the ‘radiator valve’ BC will generate very large pressure drops. It has the following parameters:

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