KRHD Grooved Coupling (Hoop): Off-type expansion joints is a reliable product for easy installation of connecting pipes. At low pressure, seal well rely on the elastic deformation of sealing-washers. when increasing in pressure, seal itself by mediums in action on the sealing-washers .Because Expansion and Contraction can cause the displacement and flexural, so it must reserve some space in the inner to make reparation of pipe.

Grooved Coupling

External Diameter connection tube DW(mm)	Nominal Diameter(mm)	Permitted Axial Loading(kgf)	Compensation (mm)	Permitted Outer Coner	Min.Length (mm)	Installation Length(mm)	Max.Length (mm)	Matching Bolt(D*L)(mm)
89	80	2680	20	17.9	90	100px	110	12×60
108	100	3550	20	15.06	90	100px	110	14×60
133	125	4620	20	13.05	95	105	115	14×60
159	150	5530	20	12.09	100px	110	120	14×60
194	175	7370	20	10.51	100px	110	120	16×60
219	200	9370	20	9.33	106	116	126	16×75
245	225	11750	20	8.36	112	122	132	16×80
273	250	14620	20	7.51	117	127	137	18×90
325	300	20680	20	6.32	120	130	140	18×100px
377	350	27875	20	5.45	125	135	145	18×100px
426	400	35600	20	4.8	130	140	150	18×110
480	450	45180	20	4.28	135	145	155	18×110
530	500	55120	20	3.88	140	150	160	18×120
630	600	65900	22	3.27	145	155	165	18×120
720	700	70170	22	2.86	150	160	170	20×120
820	800	84400	22	2.51	155	165	175	20×130
920	900	106200	22	2.24	160	170	180	20×130
1020	100px0	116870	22	2.02	165	175	185	20×130
1220	1200	130600	24	1.69	170	170	190	22×140
1420	1400	146200	24	1.45	175	185	195	22×140
1620	1600	158300	24	1.27	180	190	200	22×140
1820	1800	166000	24	1.13	185	195	205	22×150
2020	2000	179000	24	1.01	190	200	210	24×150
2220	2200	187000	26	1.01	195	205	215	24×150
2420	2400	196000	26	1.01	200	210	220	24×150
2620	2600	206000	26	1.01	205	215	225	24×160
2820	2800	253300	26	1.01	210	220	230	27×160
3020	3000	260100px	26	1.01	215	225	235	27×160
3220	3200	286900	26	1.01	220	230	240	27×180