1. Expansion joints, also known as expansion joints, expansion joints and compensators, can be divided into several types, such as corrugated compensators, sleeve compensators, rotary compensators, square natural compensators, and cannula type expansion joints. Corrugated compensators are commonly used, mainly to ensure the safe operation of pipelines, and have the following functions:
1. Compensate the axial, transverse and angular thermal deformation of absorption pipe.
2. Absorb equipment vibration and reduce the impact of equipment vibration on pipeline. 3. Absorb the deformation of pipeline caused by earthquake and ground subsidence.
2. The electric butterfly valve is a hollow rubber product used for flexible connection between metal pipes. Soft joints are also called rubber pipe soft joints, electric butterfly valves, rubber soft joints, flexible joints, high-pressure electric butterfly valves, rubber shock absorbers, etc. According to the connection mode, it can be divided into loose flange type, fixed flange type and threaded type; According to the structure, it can be divided into single sphere, double sphere, curved sphere, etc. The tubular rubber part is composed of inner and outer rubber, cord layer and steel ring, which is formed by vulcanization and then loosely combined with metal flange or parallel joint. This product can reduce vibration and noise, and can compensate for thermal expansion and cold contraction caused by temperature changes. It is widely used in various pipeline systems. The electric butterfly valve is a pipe joint with high elasticity, high air tightness, medium resistance and weather resistance. This product makes use of the advantages of rubber such as elasticity, high air tightness, medium resistance, weather resistance and radiation resistance. It is made of polyester cord fabric with high strength and strong cold and hot stability, which is compounded diagonally with it, and then vulcanized by high-pressure and high-temperature molds.
As the electric butterfly valve has good comprehensive performance, it mainly plays the role of shock absorption, noise elimination and noise reduction. Therefore, it is widely used in chemical engineering, construction, water supply, drainage, petroleum, light and heavy industry, refrigeration, sanitation, plumbing, fire protection, power and other basic projects.