What should be paid attention to for the rubber joint device?
1. When the rubber joint pipe is installed, it must be kept in a natural state. Do not artificially deform the product during installation. This can prevent the early damage of the product and the weakening of the application effect. It is forbidden to exceed the displacement limit when the rubber joint is installed;
2. If you design this product to be installed near the outlet of the pump or at the corner of the pipe, and if the product is used in high pressure and high-rise buildings suspended in the air, the pipe must have a fixed support or fixed bracket, and the force on the fixed support and fixed bracket must be greater than the axial force, otherwise the product should be installed with anti pull off limit;
3. When the flange rubber joint is installed, the stiffening rings at both ends of the sphere (protruding from the local rigid wire rope) must be fully clamped into the flange groove to avoid pulling off the sphere and flange when the pipeline is under pressure. When installing bolts, first tighten the symmetrical bolts (six or four) to ensure that the sphere and flange are all in place;
4. When the rubber joint is connected with the pipe flange, the screw rod of the bolt shall extend to one end of the pipe flange to avoid the local extrusion or pricking of the rubber joint when the thread is compressed and contracted. The bolts at each end must be pressurized and tightened symmetrically to make all bolts have different tightness. In places with poor application conditions, in addition to flat gaskets, spring washers should also be added to prevent nuts from loosening.
Different application places have different requirements on the strength of the rubber joint device. The more severe the environment is, the greater the requirement on the rubber joint device is. So in many cases, the leakage of the joint between the pipe and the rubber joint is caused because a screw is not fastened tightly! This may cause damage to the flange!

Brief Introduction to Model Selection of Flange Pneumatic Butterfly Valve
Connection mode of flange pneumatic butterfly valve: flange pneumatic butterfly valve, common fixed flange and loose flange pneumatic butterfly valve
Medium environmental protection sewage, chemical sewage, ship oil transportation, industrial gas, high temperature gas flange pneumatic butterfly valve Applicable conditions: fixed pipe thermal expansion and contraction, mechanical displacement buffering, tank truck unloading, chemical raw material escort, chemical raw material escort Nominal diameter: DN15 - DN2000mm
Product length: 100mm - 20000mm, customized according to customer's request Working pressure: 0.6MPa, 1.0MPa, 1.6MPa, 2.5MPa, 4.0MPa Working temperature: - 196 ℃ - 1000 ℃
Flange standard: national standard flange, American standard flange ANSI, BS, Japanese standard JIS, German standard DIN flat welding, butt welding, neck butt welding and other flange pneumatic butterfly valve installation precautions
1. When selecting the flange pneumatic butterfly valve, the fixed flange can be selected according to the length of the hose. When the hose is long, one end of the fixed flange is selected for installation convenience, and the loose (movable) flange pneumatic butterfly valve is selected for the other end, or the movable flanges at both ends can be selected. 2. When the construction site suspends the welding operation, the pipe body mesh of the pneumatic butterfly valve should be maintained, Prevent welding slag and arc from burning stainless steel bellows body, mesh sleeve and flange.
3. It is strictly prohibited to install the flange pneumatic butterfly valve with excessive twist.
4. The bending shall not be stopped along the root of the flange end of the pneumatic butterfly valve, and the hose shall be bent without dead bending.
5. Select the appropriate stainless steel material for the stainless steel to corrugated pipe body according to the selection of the medium. 6. The strict installation diagram shows the correct installation method. (See the installation guide) 7. It is forbidden to damage the sealing surface of the flange surface mechanically. Observe whether there are metal cracks on the surface of the flange pneumatic butterfly valve. After the flaw detection equipment stops more scientific detection, the above is related to the flange pneumatic butterfly valve. I hope it can help you.