What is the meaning of the scope of application of dowty retarder

Dowty retarder scope of application includes two aspects of meaning, the following for you to introduce

First, for products, the new standard is applicable to all kinds of dowty retarder with hydraulic oil and elastomer as medium. Here, "elastomer" is used instead of "gas" in the original standard, which conforms to the principle of maximum degree of freedom of products. In addition to hydraulic oil, the sliding oil cylinder of dowty retarder must be filled with a kind of "elastomer", which can be either nitrogen or other inert gas, or elastic body such as mechanical spring or hydraulic spring.

Secondly, for the application of products, the new standard is applicable to dowty retarder used in national railways, joint venture railways, local railways, special railways and special railway lines, which further clarifies the maximum application range of various types of dowty retarder.