A double pipe forms an inner flow path, through which a low-pressure side refrigerant flows, inside an inner pipe, and forms an inner-outer flow path, through which a high-pressure side refrigerant flows, between the outer pipe and the inner pipe. It comprises an expansion valve side connector and a counter-expansion valve side connector which are interposed between distal ends of the outer pipe and the inner pipe and members to be connected. An outer diameter of the outer pipe is 30 millimeters or less. A ratio of a difference between an inner diameter of the outer pipe and an outer diameter of the inner pipe with respect to the inner diameter of the outer pipe is 25% or less. A sealing member is provided to prevent a refrigerant leakage. The plurality of members are mechanically fixed.

An electronic expansion valve and an assembly method therefor. The electronic expansion valve includes a screw rod component, a movable connection component, a valve pin component and an elastic element. One end of the elastic element abuts the movable connection component, and the other end thereof abuts the valve pin component. In the period from the valve pin component closing the valve port part to the screw rod component moving a pre-set displacement amount in the valve closing direction, the elastic element does not generate an elastic force pushing the valve pin component towards the valve port part; and in the period from the valve pin component closing the valve port part to in a case that the screw rod component moving more than the pre-set displacement amount in the valve closing direction, the elastic element generates an elastic force pushing the valve pin component towards the valve port part.

An expansion valve (1) for a vapour compression system, the valve (1) comprising a first valve part (5) having an outlet orifice (7) and a piston (8) movable inside the outlet orifice (7) in response to a differential pressure across the expansion valve (1), controlling a fluid flow through the first valve part (5). A cross-sectional flow area of the outlet orifice (7) between a circumference at an inner surface of the outlet orifice (7) and a circumference at an outer surface of the piston (8) varies as a function of the position of the piston (8) relative to the outlet orifice (7). A first cross-sectional flow area is defined at a first differential pressure, and a second cross-sectional flow area is defined at a second differential pressure, where the first cross-sectional flow area is smaller than the second cross-sectional flow area, and the first differential pressure is lower than the second differential pressure.

An expansion valve (1) for a vapour compression system, the valve comprising a first valve part (5) having an outlet orifice (7) and a piston (8) movable inside the outlet orifice (7) in response to a differential pressure across the expansion valve (1), controlling a fluid flow through the first valve part (5), via a forward fluid passage through the first valve part (5). The piston (8) has different cylindrical shapes stepwise along a longitudinal extension of the piston (8), the piston (8) defining a first cross-sectional area along a first longitudinal extension and a second-cross sectional area along a second longitudinal extension, the first cross-sectional area being smaller than the second-cross sectional area. The first longitudinal extension is in the outlet orifice (7) at a first differential pressure and the second longitudinal extension is in the outlet orifice (7) at a second differential pressure, the first differential pressure being lower than the second differential pressure.

An expansion valve (1) for a vapor compression system, the valve (1) comprising a first valve part (5) having an outlet orifice (7) and a piston (8) movable inside the outlet orifice (7) in response to a differential pressure across the expansion valve (1), controlling a fluid flow through the valve (1). The piston (8) comprises a stop element (9) at an outlet end (8b) of the piston (8) and mechanical forcing means (10) to force the piston (8) towards a position in which the stop element (9) is brought into abutment with a valve seat (12) of the first valve part (5). A differential pressure below a predefined threshold value causes the stop element (9) of the piston (8) to abut the valve seat (12) of the first valve part (5), preventing fluid flow through the first valve part (5), via the forward fluid passage.

A flow control cartridge is used with a cold plate to form a cold plate assembly within which a refrigerant circulates for cooling at least one heat generating device. The cartridge includes a thermal expansion valve and a sensing portion that with a bellows-type actuator within the cartridge. The bellows-type actuator is located directly in a stream of the refrigerant exiting the cold plate. The thermal expansion valve is comprised of a main body having an inlet orifice arranged to receive refrigerant that has been subcooled from a condenser of a vapor compression system or a recuperative heat exchanger, and a needle arranged in an expanded section of the main body in association with discharge ports in the expanded section for discharging the refrigerant in a two-phase state into the cold plate.

In a throttle device, a guide section including a small-diameter hole which slidably guides a guide stem of a needle member is formed upstream side portion from a communicating hole-in a guide tube.

A throttling device is equipped with a valve seat in which a valve port for connecting a primary chamber and a secondary chamber is formed, a needle valve, a needle section which is inserted into the valve port, a guide section for guiding a slide shaft of the needle valve, and a coil spring for biasing the needle valve in a valve-closing direction. The guide section and the coil spring are positioned on the primary chamber side. The position of the needle valve in the valve-closing direction is restricted by a stopper section in a manner such that the minimum gap between the needle valve and the valve port is maintained. Furthermore, the needle valve is not seated on the valve seat.

An electronic expansion valve (1) is provided, comprising an inlet (9), an outlet (8), an armature (2), a stop member (3), a biasing member (4) and a solenoid coil (12). The biasing member (4) provides a biasing force on the armature (2) towards a closing direction while the solenoid coil (12) may be provided with a current to provide a magnetic force on the armature (2) towards an opening direction. It is intended to provide an electronic expansion valve that may be controlled more precisely and has a higher safety. To this end the pressure difference between the inlet pressure and the outlet pressure provides a differential pressure force on the armature (2) towards an opening direction to allow a fluid flow from the inlet (9) to the outlet (8), and furthermore the armature (2) is displaced away from the stop member (3) to allow a fluid flow from the inlet (9) to the outlet (8) if the sum of the magnetic force and the differential pressure force on the armature (2) exceeds the biasing force. The invention furthermore relates to a refrigeration system comprising such an electronic expansion valve as well as a method for calibrating such an electronic expansion valve.

In a throttle device, a body portion has a flat surface at a position at a predetermined distance from its center axis. Thus, when a needle member is moving, a working pressure of a refrigerant present between an inner peripheral surface of a guide tube and the flat surface acts in a radial direction of the body portion and presses part of an outer peripheral surface of the body portion located opposite from the flat surface against the inner peripheral surface of the guide tube.