| 主权项 |
1. An expansion valve for a vapour compression system, the valve comprising:
a first valve part having an outlet orifice in relation to an intended fluid flow direction through the first valve part, said outlet orifice providing a forward fluid passage through the first valve part, and a valve seat at an outlet of the outlet orifice, a piston having an inlet end and an outlet end in relation to an intended fluid flow direction through the first valve part, wherein the piston is movable inside the outlet orifice in response to a differential pressure across the expansion valve, controlling a fluid flow through the valve, via the forward fluid passage through the first valve part, and the piston comprising a stop element at the outlet end of the piston and mechanical forcing means to force the piston towards a position in which the stop element is brought into abutment with the valve seat of the first valve part,wherein a differential pressure below a predefined threshold value causes the stop element of the piston to abut the valve seat of the first valve part, preventing fluid flow through the first valve part, via the forward fluid passage. |
