"套筒式滑阀" can be translated into English as "sleeve-type sliding valve" or "telescopic sliding valve" (though "sleeve-type" is more commonly used in technical contexts to specifically refer to the sleeve-like structure).
"Sleeve-type" emphasizes the characteristic of having a sleeve or tubular component, which is a key feature of this type of valve.
"Sliding valve" refers to the valve's operation mechanism, where the valve element slides to control flow.
Therefore, "sleeve-type sliding valve" is the most accurate and commonly used translation.