SEAT RING FOR BUTTERFLY VALVE

PROBLEM TO BE SOLVED: To approximate the rate of fluid increase to a constant level throughout the whole value opening by improving the flow easiness of fluid at fine value opening, lesson damage to a seat ring by shortening the length of a high- velocity contraction area at fine value opening, and...

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Bibliographic Details
Main Author HISADA KOICHI
Format Patent
LanguageEnglish
Published 10.08.2001
Edition7
Subjects
ACTUATING-FLOATS
BLASTING
COCKS
DEVICES FOR VENTING OR AERATING
ENGINEERING ELEMENTS AND UNITS
GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS
HEATING
LIGHTING
MECHANICAL ENGINEERING
TAPS
THERMAL INSULATION IN GENERAL
VALVES
WEAPONS
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Summary:PROBLEM TO BE SOLVED: To approximate the rate of fluid increase to a constant level throughout the whole value opening by improving the flow easiness of fluid at fine value opening, lesson damage to a seat ring by shortening the length of a high- velocity contraction area at fine value opening, and provide a seat ring form with no drop in sealing performance at full value closing. SOLUTION: A centric butterfly value has a structure having the seat ring 3 whose wetted body position and flanged connection portion are all coated in a polymeric material such as rubber. The butterfly value seat ring 3 has an elliptic internal surface 4, and bevels 7 between opposite circular sides 6 and the elliptic internal surface 4. The width of each bevel 7 is continuously changed to provided the smallest ones near to a vertical value stem and the largest one perpendicular to the value stem.
Bibliography:Application Number: JP20000025316