Technical Parameters for Four-Ball Rubber Joint
DN		FF Length (mm)	Axis displacement		Radial displacement	Deflection displacement
mm	inch		Extension	Compression
300	12″	500	100	130	80	±12°
350	14″	500	100	130	80	±12°
400	16″	500	100	130	80	±12°
450	18″	600	120	160	85	±12°
500	20″	600	120	160	85	±12°
600	24″	600	120	160	85	±12°
700	28″	600	120	160	85	±12°
800	32″	600	120	160	85	±12°
900	36″	600	120	160	85	±12°
1000	40″	600	140	180	95	±12°
1200	48″	600	140	180	95	±10°
1400	56″	650	140	180	95	±10°
1600	64″	650	140	180	95	±10°
1800	72″	650	140	180	95	±10°
2000	80″	650	170	200	100	±10°
2200	80″	700	170	200	100	±10°
2400	96″	700	170	200	100	±10°
2600	104″	700	170	200	100	±10°
2800	112″	700	170	200	100	±10°
3000	120″	700	170	200	100	±10°

Four-spherical flexible rubber expansion joints have a variety of advantages, including the ability to absorb vibration and noise in piping systems, provide flexibility for thermal expansion and contraction of piping, allow movement in multiple directions without stressing the connecting piping, and Provides excellent corrosion resistance. Plus, they are easy to install and require minimal maintenance.The four-sphere flexible rubber joint has a larger compensation amount and a larger compensation angle than ordinary rubber joint products. These features are unmatched by other shaped rubber joints and steel expansion joints. The four-sphere flexible rubber joint is made of imported rubber vulcanization. Each layer structure has its own characteristics. The outer rubber layer is generally made of natural anti-aging rubber, which increases the service life of the rubber joint in the light and oxygen-enriched environment. The middle skeleton layer connects the inner and outer layers of rubber together, and prevents broken chains inside the rubber, which can well prevent local cracks and leakage of rubber joints. The smoothness of the inner rubber layer reduces the resistivity of the medium well and ensures the operation of the internal medium. It has a good anti-corrosion effect, and some wear-resistant effects can be used for desulfurization pipelines. GJQ(X)-4Q-II rubber flexible joint belongs to four-sphere flexible rubber expansion joint. Through curing forming, tubular rubber, which is compounded by inner and outer rubber, cord fabric and bead ring, combine with metal flange or parallel loose joint to be such rubber flexible joint.