Rubber joints are also known as shock absorbers, rubber dampers, rubber soft joints and so on. According to their appearance, they are also called single sphere rubber joints, double sphere rubber joints, concentric rubber joints with different diameters and so on. Negative pressure rubber joint is a rubber joint that can withstand suction. Simply speaking, the external pressure is greater than the internal pressure. Compared with ordinary rubber joints, it has a booster protection device to ensure that the rubber joints will not be sucked flat when subjected to negative pressure. The booster ring is generally made of steel or stainless steel. Increased/negative rubber joints have the following characteristics: 1. Negative pressure resistant rubber joint rubber joint can be made into acid, alkali, corrosion, oil and heat resistant rubber joint according to different materials. Rubber joint can adapt to a variety of media and environment. 2. Rubber joint material is polar rubber, which has good sealing property, light weight, convenient installation and maintenance, long service life of rubber joint, but avoids contact with sharp metal instruments, so as to avoid puncturing rubber joint sphere. 3. Rubber joints such as overhead use of elastic brackets, rubber joints installation bolts should be tightened diagonally. 4. When the pipeline pressure is too high, the rubber joints shall be connected with flanges at both ends by limit bolts. 5. The standard of flange connection of rubber joint is GB4216.3-4216.5, which can be explained separately. The working pressure grade of this product is 0.6 Mpa, 1 Mpa, 1.6 Mpa and 2.5 Mpa. Negative pressure spheres can be used in vacuum. In order to avoid deformation and damage of the sphere. Installation of negative pressure ring is an indispensable work for rubber joints, because the positive pressure of rubber joints can reach a high level, but the negative pressure will fall on the contrary. For the installation of negative pressure ring, the practicability of rubber joints will be improved one layer. Installation of negative pressure ring is usually selected before assembling rubber joints. Because the negative pressure ring is as large as the inner part, it is a very complicated matter for the assembled rubber joints. Installation of negative pressure ring also improves the safety of rubber joints. Over the past few years, our Gongyi Hongsheng Pipeline Equipment Co., Ltd. has continuously developed new products, improved product quality, done a lot of research and experiments, put forward a new product structure, greatly improved the performance of the products, and won the praise of the vast number of users. If special specifications of products are needed, they can be designed and manufactured according to user's requirements. And sincerely hope that new and old customers, design units recommend the use of our company's products.