The Variable Pressure Reducer and Thermal shut off (VRTS) is used to reduce the pressure and control the flow of high-pressure steam and liquid samples, and shut off the sample line for high sample temperature. The VRTS is a compact version for pressure reduction. The pressure of the incoming sample is reduced as the liquid is forced to travel through the narrow gap between the tapered rod and the rod opening. Because the work is done over the entire length of the rod, localized wear is held to a minimum. The result is a very long service life compared with devices in which the pressure drop is taken over a very short distance (fixed orifice, pressure regulator, etc.). Other devices erode frequently causing function loss and down time. Thermal shut off valve at the end will close if sample temperature increases by preset value. These type of pressure reducers are recommended by ASME 19.11-1997.