Arrangement in regulating valves
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United States of America Patent
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Oct 12, 1999
Issued Date -
N/A
app pub date -
Feb 7, 1997
filing date -
Apr 15, 1994
priority date (Note) -
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status (Latency Note)
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Abstract
The invention relates to an arrangement in regulating valves for steam, gases or liquids and includes a cage (2) fixedly disposed in a valve housing (1), there being a movable valve body in the cage, the body (3) being positionally settable in the fixed cage (2) via a spindle (4) such as to be sealingly engageable via a sealing surface (5) formed on it against a seating (6) formed in the valve housing (1), the body (3) during its movement to its upper, i.e. fully open, position successively uncovering orifices (9) in the fixed cage (2) for achieving a gradual increase in through-flow area in the valve. The body (3) has a short skirt (10) coacting with seating (6) and provided with a plurality of orifices or grooves (11) which are successively uncovered at the beginning of the valve opening phase, as the body (3) moves away from its sealing engagement against the seating (6), or successively closed off during the valve closing phase as the body moves towards sealing engagement against the seating (6) such as to serve as an extra throttling locating for small opening increments for achieving great regulation accuracy even with small flows.
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