Patent ID: 7624929
Filing Date: 2009-12-01
Classification: F16K,F25B

Abstract:
1. Expansion valve, especially for cooling units in vehicle air conditioning systems, said expansion valve comprising a valve arrangement, said valve arrangement comprising a valve-closing member and a valve seat for receiving the valve-closing member such that the valve-closing member, in a closing position, fits snugly in the valve seat and closes a passage between a coolant inlet side and a coolant outlet side, said expansion valve further comprising an actuating device which opens the valve arrangement by a lift motion of a transfer pin, wherein the valve seat or the valve-closing member has at least two zones, a first zone forming with the valve-closing member or with the valve seat, in a closing position, a seal seat, wherein the passage is closed, and at least one further zone regulating a coolant mass flow flowing through the passage, depending on the lift motion of the transfer pin and a gradient of the first zone differing from a gradient of the at least one further zone, wherein the gradient of the at least one further zone determines the mass flow in dependence on the lift motion of the valve-closing member.