JIS F7480 Marine Double Flanged Type Butterfly Valve
Nominal Diameter: DN40-DN800; Working Pressure: ≤1.6Mpa; Working Temperature: ≤120℃; Valve Body Material: Ductile Iron QT450, Cast Steel ZG230-450, SUS, Bronze; Design Standard: API609-83 Flange Connection Dimensions: JIS B2212 JIS B2213 JIS B2214; Structure Length: JIS B2002-1987; Pressure Test: JIS B2003-1987; Driving Form: Handle, Worm Gear, Pneumatic, Electric, etc and so on;
Overview
Problems:
Butterfly valve leakage causes can be divided into two categories: vertical and horizontal. For example: poor design, poor manufacturing, improper installation, improper operation, poor maintenance for vertical reasons. For example: the pressure system inside and outside the pressure difference, the size of the gap, sealing structure, sealing material performance, inside and outside the temperature and change, shaft and hole eccentricity, lubrication status, vibration and impact of the size of the impact and other factors that is the influence of the horizontal reasons.
Solutions：
The use of adjusting the operation, adjusting the seal preload or adjusting the relative position between the parts to achieve the implementation of a method of eliminating leakage; for example: to the leakage of the seal to apply a certain amount of preload to achieve the stop leakage; the use of the medium itself or other liquids flushed off the sealing surface of the impurities and other measures.
Drawing:
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