Servo-controlled expansion valve for a volatile fluid

Details Servo-controlled expansion valve for a volatile fluid Servo-controlled expansion valve for a volatile fluid

F - Mech Eng,Light,Heat,Weapons

16

K

137/37

F16K 31/02 (2006.01) F25B 41/06 (2006.01)

Patent

CA 2019088

Abstract A servo-controlled expansion valve for a volatile fluid is disclosed, particularly for use in an electronically controlled injec- tion of refrigerant in the evaporator of refrigeration installations. The expansion valve comprises a main valve (21) which is actuatable by a controlled pilot valve arrangement (6) by way of a servo arrangement in which the fluid serves as pressure medium. When the pilot valve arrangement is actuated by the fluid as pressure medium, there is the danger that the fluid evaporates in the operating chamber. The com- pressibility of the vapour can lead to oscillations which also cause the main valve (21) to oscillate. These oscillations are to be avoided. For this purpose, the servo arrangement (24) is thermally connected to the outlet side (2) of the main valve(21). Fig.1

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