| 摘要 |
A pressure management device (10) for use with a heating system is disclosed which obviates the need for manual topping up of the heating system, protects against flooding and avoids danger of backflow of heating system fluid and consequent contamination of a mains water supply. The pressure management device has an inlet (12) for connection to a mains water supply; an outlet (14) for connection to a heating system; and a fluid flow path between the inlet and the outlet. A one-way valve (16) is disposed in the fluid flow path and arranged to permit flow in the direction from the inlet toward the outlet and to resist flow in the opposite direction. A pressure reducing valve (18) is also disposed in the fluid flow path and is configured to respond to an outlet pressure of the pressure management device, being normally maintained in a closed state by the outlet pressure but adapted to open when the outlet pressure falls below a threshold. In this way the pressure reducing valve causes the heating system to be topped up when necessary. Additionally a flood prevention device (20) is disposed in the fluid flow path and is configured to close in response to excessive flow through the pressure management device, so that any risk that the pressure reducing valve might permit uncontrolled release of water in the event of a leakage in the heating system is obviated. |
