F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
62/143, 26/162,
F16K 15/02 (2006.01) F25B 41/06 (2006.01)
Patent
CA 1296914
TITLE OF THE INVENTION: EXPANSION DEVICE FOR A REFRIGERATION SYSTEM, PISTON THEREFOR AND METHODS OF MAKING THE SAME ABSTRACT OF THE DISCLOSURE: An expansion device for a refrigeration system, piston therefor and methods of making the same are provided. The expansion device comprises a housing having opposed ports for coupling the device in the system. The ports are separated from each other by an internal valve seat of the housing. The expansion device also comprises a movable piston disposed in the housing and having a first end surface adapted to engage against the valve seat to tend to close the same when the piston is disposed in a first position thereof in the housing. The housing has an annular shoulder, with the piston having a second end surface for engaging against the shoulder when the piston is disposed in a second position thereof in the housing. The piston has a passage passing therethrough and through the end surfaces thereof for interconnecting the opposed ports together in a restricted manner when the piston is in the first position thereof. The piston also has an outer peripheral surface interconnecting the end surfaces together and being provide with a plurality of grooves therein for interconnecting the opposed ports together in a substantially nonrestricted manner when the piston is in the second position thereof. The piston comprises a one-piece member of polymeric material, the first end surface of the piston comprising a substantially hemispherical section that is the part thereof that is adapted to engage against the valve seat when the piston is in the first position thereof.
576540
Halmose John M.
Sepso Roger P.
Gowling Lafleur Henderson Llp
Robertshaw Controls Company
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