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低速降压涡轮配以空心轴的流量调节装置，可以降低涡轮钻具的工作转速，更好地配合牙轮钻头在较低的转速下工作。介绍了其工作原理、试验装置、试验流程及所测各项参数；试验了环流系数为11时的低速降压涡轮配以分流喷嘴内径为0、20、30和35mm4种不同的工况。试验在每种工况下保持流量不变，为便于数据分析，保持4种工况下的制动转矩基本相同。试验表明，195型涡轮在分流喷嘴内径不大于30mm时，确实起到了降低涡轮工作转速和增大扭矩储备的作用。
Low-speed step-down turbine with a hollow shaft flow control device, you can reduce the working speed of the turbine drill to better work with the roller bit at a lower speed. The working principle, test equipment, test flow and measured parameters are introduced. Four kinds of working conditions of 0, 20, 30 and 35mm are tested with the low speed turbine with a circulation coefficient of 11 and the diameter of the splitter nozzle. Test in each condition to maintain the same flow, in order to facilitate data analysis, to maintain the same braking torque under four conditions. Tests show that 195-type turbine in the splitter nozzle diameter of not more than 30mm, indeed played a role in reducing turbine speed and increase torque reserve.