Double Eccentric

Specification of "O" Series

The valve shall be capable of bi-directional flow and provide
Bubble tight shut-off at full rated pressure.

Type numbering system

• AV-OSR Double Eccentric SEMI-LUG type Butterfly valves
  
• AV-OLR Double Eccentric LUG type Butterfly valves
  
• AV-OFR Double Eccentric FLANGE type Butterfly valves
  

Standards compliance

• The face to face dimension shall be in accordance with KSV 7490 and JIS F 7480
  

Production range

• SIZE : 50A (2inch)~1000A (40inch)
  
• WORKING PRESSURE : 0bar ~ 25bar
  
• WORKING TEMPERATURE : -20°C ~ +250°C
  

Applicable flange

• KS/JIS 5K, 10K, 16K, 20K
  
• ANSI B 16.5 Class 150LB
  
• BS 4504 PN10, PN16, PN25
  
• ISO 2084 PN10, PN16, PN25

The Double Eccentric Design

It effects friction-free contact between body and seat, the rotation axis(stem) of the valve disc is shifted from the center by a distance of the width of A and B, a cam effect is produced which prevents from wearing the seal surface, lessens seating torque and offers longer service life and easy operation.

Applications of Piping System

• Cargo oil system in the Tanker
  
• Sea water system
  
• Water ballast system
  
• Fresh water system
  
• Tank cleaning system
  
• Fuel oil and Diesel oil system
  
• Cargo tank Venting and Inert gas system
  
• Other piping system where applicable
  
• Bilge and Drainage system

Classification by Connection Type

Appearance	Type	General Charateristics
	AV-O Series AV-OSR(SEMI-LUG)	-General Applications - Shipbuilding water work, heating and ventilation power plants, Chemical plant etc. -Similar as wafer type except a pair of the thread bolt hole at upper and lower side in way of the stem for easy mainternance of adjacent pipe. -Easy handling and light weight. -Less quantity of bolt hole and easy installation -Keep liquid remained during repairing adjacent pipe.
	AV-O Series AV-OLR(LUG)	-General Applications at dead end pipe. -Ring shape bolt hole for bolting with flange. -Keep pressure inside during repairing adjacent one side pipe. -Different flange shape. -Possible damage on full face gasket. -Hard repairing corroded bolt. -More man-hour for installation. -Heavy weight
	AV-O Series AV-OFR(FLANGE)	-General Applications     - Every places in the pipe line complete flange at both end. -Suitable to general pipe flange. -Suitable for shipside valve in the ship.               -Keep pressure inside during repairing adjacent pipe. -Heavy weight.                  -Easy repairing.