B-2.htm

Type	Structure	Special Features
Single type		For taking up axial and lateral movement in low pressure piping system. When movement is large, Double Type is used. If we adopt the design structure with control ring, it is all right for higher pressure piping systems also.
Double type
Universal type		Double Type expansion joint with guide flange and tie-rod structure. Applied especially when lateral movement is large. If control ring is attached, it is all right for higher pressure piping also.
Hinge type		Hinge arm and pin are attached to both end pipes. By this structure, it stands for internal thrust and takes up angular movement caused to a plane.
Gimbals type		Gimbals ring, pin and arm are attached to both end pipes. By this structure, it controls internal thrust and takes up angular movement caused to any plane.
Straight pipe pressure balance type		Used in straight piping where internal pressure is high and fixing points strength is not enough. It takes up by itself axial thrust created by internal pressure, and only bellows reacting force is imposed to fixing points.
Bent pipe pressure balance type		2 same caliber expansion joints are combined together using elbow in between. Used in bent piping where internal pressure is high and fixing points strength is not enough. Thrust created by internal pressure is restricted by tie-rod bolts and no effect to piping.
Round corner rectangular type		Takes up expansion in piping and duct for boiler at thermal power station.
Hybrid type (compounded structure)		Consists of 2 layers. One is steel bellows with excellent safety, and the other one is non-metal with excellent resistance for corrosion. Used under 200℃ of sulfic acid dew point.
Longitudinal wave loop type		Used at the area where different scale of expansion takes place from time to time such as economizer outlet or in connection area between rear heat exchanger wall and skin casing. Also used when different scale of expansion takes place among horizontal X, Y direction and vertical Z direction.