Why is there a single and double ball rubber expansion joint?

Single-ball rubber expansion joints and double-ball rubber expansion joints have the same scope of application, both can reduce vibration and noise, and the thermal safety performance due to temperature changes is not as high as single-ball, especially in the case of double-ball rubber expansion joints the sphere is also prone to bursting in the case of long-term high pressure. Double sphere rubber soft joint pressurization protection device, can well protect the stability of the sphere, in the use of the process of sudden pressurization can also play a compensating role in expansion and contraction, widely used with a variety of pipeline systems.
Single sphere rubber expansion joint is a hollow rubber product used for flexible connection between metal pipes, which consists of inner and outer rubber layer, cord fabric layer and steel wire ring to form a tubular rubber part, which is vulcanized and then loosely combined with metal flange or parallel joint.
The structure of double sphere rubber expansion joint is basically the same as that of single sphere rubber expansion joint, except that the installation length is greater than that of single sphere rubber expansion joint, and the double sphere connection method is adopted.
Because of the double spherical shape, the connection length of this rubber joint is better than that of single sphere rubber joint, and the compensation amount is greater than that of single sphere rubber joint. However, the double spherical rubber joint has a good protective effect.