| 摘要 |
A check valve connectable in a refrigerant line is economically fabricated from only three parts-(1) a copper tubing body connectable in the refrigerant line, (2) a nonmetallic shutoff ball, and (3) an annular valve seat member having a conically tapered seating surface on one of its ends. The seat member is coaxially received within a first end of a longitudinally central portion of the tubing positioned between spun-down opposite end portions thereof, with the seating surface end of the seat member facing the second end of the central tubing portion, and the ball being received in the central tubing portion for axial movement into and out of sealing engagement with the seating surface. Three circumferentially spaced, axially elongated side wall indentations are formed in the central tubing portion. The indentations have (1) first end portions which, with the first end of the central tubing portion, axially locks the seat member within the central tubing portion, (2) second end portions that combinatively form an axial stop for the ball, and (3) main body portions that combinatively form within the central tubing portion a track structure that axially guides the ball between its closed position against the seating surface and its open position against the axial stop. When the ball is in its open position against the axial stop, refrigerant flows through the interior of the valve seating member and then around the ball via circumferentially spaced, axially extending fluid bypass passages positioned between the tubing side wall indentations.
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