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| THE CONCENTRIC DESIGN |
| CENTER OF SHAFT in the 'Center of Pipe' / 'Center of Valve Seat' Application for BUTTERFLY VALVE WITH ELASTOMER LINING. |
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Symmetric disc design ensures favorable flow characteristics and low pressure drop |
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Concentric shaft ensures low operating torque |
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Lining gives a good protection to valve body, and acts as flange gasket |
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Shaft penetrates the valve seat |
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Limited choice of seating materials (Elastomer, only) |
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Suitable for installation in 'Low Pressure System' |
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Not suitable where FIRE-SAFE or FIRE-PROOF requirement apply to the valve or valve installation method |
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| CLASSIFICATION BY CONNECTION TYPE |
| Appearance |
Type |
General Characteristics |
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AV-C Series AV-CWR (WAFER) |
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General Applications-Shipbuilding water works, heating and ventilation, power plants, Chemical plant etc. |
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Valve to be installed with long bolts between the flanges at adjacent pipe without flanges on the valve. |
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Easy handling and light weight. |
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Easy installation less bolt quantity and low cost. |
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Inconvenient maintenance of adjacent pipe. |
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AV-C Series AV-CSR (SEMI-LUG) |
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General Applications-Shipbuilding water works, heating and ventilation, power plants, Chemical plant etc. |
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Similar as wafer type except a pair of the jack bolt hole in way of upper and lower sides for easy maintenance of adjacent pipe. |
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Easy handling and light weight |
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Less quantity of bolt and easy installation |
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Keep liquid remained during repairing adjacent pipe. |
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AV-C Series AV-CLR (FULL-LUG) |
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General Applications: General piping system pump outlets, tank drains, ship side's etc. |
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Ring shape thread bolt hole for bolting with flange. |
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Keep pressure inside during repairing adjacent one side pipe. |
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Different flange shape. |
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Possible damage on full face gasket. |
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Hard repairing corroded bolt. |
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More man-hour for installation. |
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Heavy weight. |
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AV-C Series AV-CFR (FLANGE) |
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General Applications-All piping system Shipside valves, ballast valves, water works, power plants etc. |
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Both ends with complete flange. |
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Suitable to general pipe flange. |
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Suitable for shipside valve in the ship. |
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Heavy weight. |
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Same installation as ordinary valve. |
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SCHEMAOF CONCENTRIC TYPE |
| The valve shall be a 90°turn clockwise to close, non-jamming, resilient seated valve for zero leakage service. The valve shall be torque seated designed in such a manner that the disc can not be rorated the seat without the actuator. Also this valve enables the fluid perfect shut-off regardless of the flow direction. |
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| OPERATIONS |
| The following operation of the valve is possible; depend on the valve location, the type of work and service of the valve to be provided. |
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Manual handle lever Operation |
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Manual worm gear Operation |
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Single or double acting pneumatic Operation |
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Hydraulic actuator Operation |
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Electric motor Operation |
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