Pipe Joint, Rubber Joint, Flexible Joint, Expansion Joint, Pipe Expansion Joint, Rubber Expansion Joint, Flexible Expansion Joint, Rubber Compensator, Expansion Compensator, Flexible Rubber Compensator, Flexible Expansion Compensator, Flexible Pipe Compensator, Flexible Compensator

China National Standards Drafting Unit of Rubber Joint
Qualified Joint Supplier in Nuclear Power Plant

I Description:
Rubber coupling also known as flexible rubber joint, rubber flexible connectors, Rubber flexible joints, pipeline shock absorber, etc.

II Classification:
1)According to appearance: Concentric with diameter rubber joint, concentric reducer rubber joint, eccentric reducer rubber joint.
2) According to the structure: Single Sphere Flexible Rubber Joint, Double Sphere Rubber Joint, Spheres Rubber Joint, and Elbow Sphere Rubber Joint
3) According to link form: Flange Coupling, Threaded Joint

III Characteristic Feature:
1) Small volume, light in weight, very good flexibility, convenient installation and maintenance
2) Transverse displacement, axial displacement, angular displacement
3) Reduce noise, shock absorption

IV Range of Application:
Due to favorable integrated performance, they can be widely used in chemical industry, construction, water supply, drainage, oil industry, light and heavy industry, refrigeration station, water heating system, fire fighting system, electric power system, etc.

V Application Medium:
According to different material, acid resistance rubber joint, alkali proof rubber joint, oil resistance, rubber joint, thermostability rubber joint, low temperature resistance rubber joint, wear resistance rubber joint can be made to suitable for various kinds of medium, and environment.

VI. Material List
No.	Name						Material
1)	Inner rubber						IIR, CR, EPDM, NR, NBR
2)	Outer rubber						IIR, CR, EPDM, NR, NBR
3)	Framework layer						Polyester cord fabric
4)	Flange						Q235
5)	Reinforcing ring						Steel wire rope
VII. Physical and Mechanical Properties of Rubber Expansion Joint
No.	Item									index			Measured value
										Inner/outer rubber lining
1)	Tensile strength (Mpa)									≥12			13.5
2)	Tensile yield (%)									≥450			560
3)	Tension set at break (%)									≤25			20
4)	Hardness (Shore A hardness)									60±5			60
5)	Brittleness temperature (°C)									≤-30			-40
6)	Cohesive strength (between cord fabric) (KN/m)									≥2.0			4.8
7)	100°C*48h Hot air aging			Rate of Tensile Strength Reduction						≤25			15
				Rate of Ultimate Elongation Reduction						≤30			20
8)	Mass change (10%H2SO4*Room temperature) %									≤3			2
9)	Mass change (10%H2SO4*Room temperature) %									≤3			2
VIII. Technical Parameters for Double Sphere Flexible Rubber Joint
DN Diameter			FF Length (mm)		Axis displacement						Radial displacement			Deflexion displacement
					Type-I			Type-II			Type-I	Type-II		Type-I	Type-II
mm		inch			Extension	Compression		Extension	Compression
32		1?″	165		30	50					45			±7.5°
40		1?″	165		30	50					45			±7.5°
50		2″	165		30	50					45			±7.5°
65		2?″	175		30	50					45			±7.5°
80		3″	175		30	50					45			±7.5°
100		4″	225		35	50					45			±7.5°
125		5″	225		35	50					45			±7.5°
150		6″	225		35	50					45			±7.5°
200		8″	325		35	60
250		10″	325		35	60
300		12″	325		35	60
350		14″	325		35	60
400		16″	400		40	60
450		18″	400					65	70			70			±12°
500		20″	400					65	70			70			±12°
600		24″	400					70	75			75			±12°
700		28″	450					70	75			75			±12°
800		32″	450					70	75			75			±12°
900		36″	450					70	75			75			±12°
1000		40″	500					75	80			70			±12°
1200		48″	500					75	80			70			±10°
1400		56″	500					75	80			70			±10°
1600		64″	500					75	80			70			±10°
1800		72″	550					80	85			65			±10°
2000		80″	550					80	85			65			±10°
2200		80″	550					80	85			65			±10°
2400		96″	550					80	85			65			±10°
2600		104″	550					80	85			65			±10°
2800		112″	550					80	85			65			±10°
3000		120″	550					80	85			65			±10°