Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1987-09-14
1988-11-15
Nilson, Robert G.
Fluid handling
Line condition change responsive valves
Direct response valves
137528, 13753317, F16K 1502
Patent
active
047841770
ABSTRACT:
An expansion device for a refrigeration system, piston therefor and methods of making the same are provided, the expansion device comprising a housing having opposed ports for coupling the device in the system and being separated from each other by an internal valve seat of the housing, and 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 having an annular shoulder, 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 having 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 having an outer peripheral surface interconnecting the end surfaces together and being provided 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 comprising 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.
REFERENCES:
patent: 1443675 (1923-01-01), Bowler
patent: 2670922 (1954-03-01), Carlisle
patent: 3457949 (1969-07-01), Coulter
patent: 3805825 (1974-04-01), Lovingham
patent: 3992898 (1976-11-01), Duell et al.
patent: 4009592 (1977-03-01), Boerger
patent: 4431117 (1984-02-01), Genbauffe et al.
patent: 4531624 (1985-07-01), Ideta
patent: 4643222 (1987-02-01), Wiser
Halmose John M.
Sepso Roger P.
Nilson Robert G.
Robertshaw Controls Company
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