Pneumatic hydraulic cov cuab yeej yog cov cuab yeej tshwj xeeb tsim los txhim kho sai thiab tshem tawm cov tiv thaiv cable. Lawv txoj haujlwm thiab kev ua haujlwm yog nyob ntawm kev sib koom tes ntawm ntau yam tseem ceeb. Cov khoom tseem ceeb muaj xws li cua tshuab, hydraulic twj tso kua mis, triplet, pneumatic actuator, hydraulic actuator, pipeline system, thiab cov cuab yeej tiv thaiv kev nyab xeeb.