1.24 years manufacturing experience

2. ISO9001, ISO14001

3. Import rubber

4. China National Standards Drafting Unit of Rubber Joint

5. Qualified Joint Supplier in Nuclear Power Plant  

1) Product Performance

The Liwei GJQ(X)-SF Double Sphere Rubber Expansion Joint are double sphere designed with integral rubber flanges for tough, demanding industrial applications, as found in: Chemical/Petrochemical Plants, Industrial Process Piping Systems, Marine Services, Power Generation Plants, Pulp/Paper Plants, Steel Mills, Water/Wastewater and Pollution Control Systems.

Installed next to mechanical equipment or between the anchor points of a piping system to:

(1) Absorb Pipe Movement/Stress
(2) Reduce System Noise
(3) Isolate Mechanical Vibration
(4) Compensate Alignment/Offset
(5) Eliminate Electrolysis,
(6) Protect Against Start-Up Surge Forces.

The Liwei GJQ(X)-SF Double Sphere Rubber Expansion Joint is a twin sphere design with more length, the supply range is from 32mm to 3000mm, and design pressure can be 1.0MPa/1.6MPa/2.5MPa. Compared to Single Sphere Rubber Joint(GJQ(X)-DF- I, GJQ(X)-DF- II ), mechanical and acoustical performance can be almost double by changing to the most commonly specified twin sphere construction. Twin sphere designs are more flexible and allow greater movement.

2) Application Range

Equipped with the excellent comprehensive performances of flexible rubber joint, Liwei GJQ(X)-SF Double Sphere Rubber Expansion Joint can be used for lift and transportation of raw water and sewage, transportation of water supply, cooling cycle water of thermal power plant, condensate water of metallurgy industry and chemical materials of chemical industries, cooling and dilution of oil and chemical industries and flexible connection of other industries.

It is also suitable to transport all grain and powder material and gas for its high abrasive resistance.
In addition, special notifications are hereby conducted for design units and clients so as to ensure the project quality. Please note to install anti-break stop device, if Liwei GJQ(X)-SF Double Sphere Rubber Expansion Joint are designed to install close to pump exit nozzle and pipes' corner. If your pipes need to be buried, please use our patent-buried protective devices. In a word, remark requirement for use, and we will provide satisfactory service to you.

3) Features and Benefits:

1, Versatile hand-built construction. Made in China
2, Bellows to Absorb directional movement
3, Absorb vibration, noise and shock
4, Bellows Compensates for misalignment
5, More compensation capability
6, Embedded steel reinforce ring enable the pressure resistance
7, Solid galvanized steel floating flanges speed the installation time
8, Integral rubber flange design, prevent pulling out
9, High tensile aircraft cable is embedded in the raised face rubber ends to prevent pull out and avoids the sharp cutting edge of solid steel rings
10, No gaskets required; DIN PN10/16 drilling standard, other flange drilling available, including ANSI 150lb/300 lb, BS, and JIS

Note:
1. The Liwei GJQ(X)-SF Double Sphere Rubber Expansion Joint Supply range is from DN32 to DN3000.
2. Control units must be used when piping is not properly anchored.
3. The rated pressure 2.5MPa products will only be sold with control units.
4. The Liwei GJQ(X)-SF Double Sphere Rubber Expansion Joint Pressure rating is based on 30° C operating temperature.
 

Material lists
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	Reinforcing bar	Polyester cord fabric
5	Flange	Q235
6	Reinforcing ring	Steel wire rope

Physical and Mechanical Properties Form
No	Item		Index		Test value
			Inner rubber	Outer rubber
1	≥Tensile strength(MPa)		12	13	13.6
2	≥Break strength (%)		450	500	564
3	≤Break permanent deformation (%)		25	30	22
4	≤Brittleness temperature		-30	-30	-40
5	≥Viscosity(KN/m)		2.0	2.0	5.6
6	Aging hot air   (100degree×48h)	Tensile strength change (%)	+25~-25	+25~-25	20
		Tensile rate change (%)	+10~-30	+10~-30	5
7	≥Acid resistant10%H2SO4×168h		0.7	0.7	0.85
8	≥Alkali proof10%NaOH1×68h		0.7	0.7	0.85

Technical Parameters
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	1¼″	165	30	50			45		±7.5°
40	1½″	165	30	50			45		±7.5°
50	2″	165	30	50			45		±7.5°
65	2½″	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°