Products should be marked in the following order: product code, type code, structure code, performance code, working pressure, nominal diameter. Product and structure codes are as follows: flexural rubber joint RFJ, single sphere D, double sphere S, elbow W, concentric reducer Yt, eccentric reducer Yp, fan coil joint F.
Example of marking: RFJD-1.6×200,. Refers to the nominal diameter of 200mm single sphere flexural rubber joint, working pressure 1.6Mpa.
Working pressure: the test pressure of the rubber joint is 5 times the working pressure, burst pressure is 3 times the working pressure.
Vacuum resistance: nominal inner diameter of 300mm or less, working pressure of 1.6Mpa or more rubber joints, vacuum resistance of not less than 100Kpa, other specifications of the rubber will be the forehead of the vacuum by the supply and demand side agreement.
Rubber joints used in drinking water system safety evaluation: rubber joints used in drinking water system safety flat
Rubber joints used in drinking water system, through the product after the water quality should be consistent with GB/T5749 "drinking water health standards" and GB/T17219 "drinking water transmission and distribution of drinking water equipment and protective materials, safety evaluation of relevant provisions and requirements. Standards" of the relevant provisions and requirements.
Requirements for metal flanges and flat joints: metal flanges shall meet the requirements of GB/T9119, and flat joints shall meet the requirements of GB/T3289.37.
Requirements when the end face of the rubber joint is reinforced with steel wire ring: when the end face of the rubber joint is reinforced with steel wire ring, the steel wire ring should be kept round and should be located in the same plane in the same year.
Test experiments
1 Appearance quality of the product specification size: appearance quality is determined by visual inspection, product specification size measured by vernier caliper or tape measure.
2 Adhesive physical properties test
1). Determination of tensile strength and elongation at break of the adhesive material is carried out according to the provisions of GB/T528.
2). Determination of the hardness of the rubber material in accordance with the provisions of GB/T531.
3). The brittleness temperature test of the rubber material is carried out according to the provisions of GB/T1682.
4). Rubber and fabric adhesion and strength determination according to the provisions of GB/T532.
5). Hot air aging test of rubber material according to the provisions of GB/T3512.
6). Acid and alkali resistance test of the rubber material is carried out according to the provisions of GB/T1690.
3 Hydraulic pressure and vacuum test of finished products
1) Hydraulic pressure test is carried out with reference to the provisions of 6.3 in GB/T5563.
2) Vacuum test with reference to GB/T5567 in the 2-5 chapter of the relevant provisions.
4 ） Displacement performance test: displacement performance test in accordance with Appendix A.
5) The form and position of reinforced steel wire ring in the end face of the rubber joint: the form and position of reinforced steel wire ring in the end face of the rubber joint with X-ray fluoroscopy test.
6 ） The water quality test of the water passing through the product is carried out according to the provisions of GB/T5749 and GB/T17219.