Product Introduction

oil-resistantrubberjointAlso known as nitrilerubberjointDing Qing rubber joint, Ding Qing rubber joint, its spherical skeleton material uses polyester curtain fabric to make the comprehensive performance more reliable. This process design is the first of its kind in China.

① Inner rubber layer: Nitrile rubber (NBR), which can enhance the resilience, compression set, electrical properties, tear strength, water swelling resistance, oil resistance, high temperature resistance and other properties of rubber joints. The inner lining rubber tube layer extends to the outer end face of the rubber joint flange, and its performance is to prevent water leakage and erosion.

② Skeleton layer: Nitrile rubber+chloroprene rubber+polyester curtain fabric; The skeleton material is selected with high strength, with a fracture strength of ≥ 190cN/tex, a fracture stress of ≥ 2.76GPa, an elastic modulus of ≥ 44N/tex, and a fracture elongation of ≥ 4% polyester cord fabric. The tight combination between the inner and outer layers and the skeleton layer is vulcanized into one, which solves the thermal expansion and overall adhesion strength and pressure resistance of the rubber joint, ensuring sufficient ability to withstand its vacuum degree and water hammer impact.

③ Outer rubber layer: Nitrile rubber. Nitrile rubber, with the English code NBR, is a rubber material that is resistant to oil, high temperature, and aging. Its tensile strength is ≥ 13MPa, elongation at break is ≥ 500%, permanent deformation at break is ≤ 30%, brittle temperature resistance is ≤ -30 ℃, and adhesive strength is ≥ 2.0DN/m. Due to the exposure of the outer rubber layer of rubber joints to air, it is easily affected and damaged by external factors, which requires the outer rubber layer of the joint to have characteristics such as oil resistance, heat resistance, and ozone resistance. For these situations, we used nitrile rubber. Through a reasonable formula, nitrile rubber is mainly suitable for hydraulic oil and other oils, as well as several special oils that cannot be used (aviation kerosene, gasoline, diesel). The operating temperature of nitrile rubber can reach 140 ℃, and the brittle temperature is -15 ℃~55 ℃.

④ Rubber joint matching flange: Special slotted flange. The rubber joint matching flanges manufactured by our company are made of steel from large national steel companies, with material Q235-A, and their chemical composition and mechanical properties comply with GB700-1998 standards. Strictly follow the ISO9001 quality system from raw material entry to final acceptance.

Product Features:

Excellent oil resistance, high wear resistance, good heat resistance, strong adhesion, (resistant to oil, including hydraulic oil, aviation kerosene and other oils, and high temperature below 150 degrees)

Product Model:

Nominal diameter DN		Length Lmm	Number of screwsn	bolt hole diametermm	Diameter of bolt hole center circlemm	axial displacementmm		lateral displacementmm	deflection angle（a1+a2）
mm	Inch					stretch	compress
25	1	95	4	14	85	6	9	9	15
32	1 1/4	95	4	18	100	6	9	9	15
40	1 1/2	95	4	18	110	6	10	9	15
50	2	105	4	18	125	7	10	10	15
65	2 1/2	115	4	18	145	7	13	11	15
80	3	135	4	18	160	8	15	12	15
100	4	150	8	18	180	10	19	13	15
125	5	165	8	18	210	12	19	13	15
150	6	180	8	23	240	12	20	14	15
200	8	210	8	23	295	16	25	22	15
250	10	230	12	23	350	16	25	22	15
300	12	245	12	23	400	16	25	22	15
350	14	255	16	23	460	16	25	22	15
400	16	255	16	25	515	16	25	22	15
450	18	255	20	25	565	16	25	22	15
500	20	255	20	25	620	16	25	22	15
600	24	260	20	30	725	16	25	22	15
700	28	260	24	30	840	16	25	22	15
800	32	260	24	34	950	16	25	22	15
900	36	260	28	34	1050	16	25	22	15
1000	40	260	28	34	1160	18	26	24	15
1200	48	260	32	41	1380	18	26	24	15
1400	56	260	36	34	1560	20	28	26	15
1600	64	350	40	34	1760	25	28	30	10
1800	72	400	44	41	1970	25	30	30	10
2000	80	450	48	48	2180	25	30	30	10
2200	88	500	52	43	2390	25	35	30	10
2400	96	500	56	43	2600	25	35	30	10
2600	104	500	60	48	2810	25	35	30	10
2800	112	500	64	48	3020	25	35	30	10
3000	120	500	68	48	3220	25	35	30	10
3200	128	500	72	36	3430	25	35	30	10