Insulation sleeves for valves, pipes, and flanges are products designed according to customers' requirements for high and low temperature insulation, as well as energy-saving requirements for valves, pipes, and flanges in various industries. They effectively solve problems such as insulation of insulated pipes, insulation of elbows, sliding lubrication, exposed pipe ends, waterproofing and anti-corrosion at bends in various pipeline projects such as heating, cooling, thermal power, electric power, and chemical engineering. They can achieve the effects of energy conservation and environmental protection.