4 Disassembly and Assembly Instructions Follow the procedure below to disassemble the main unit. Remove the cap, the outer foil with foil frame and the inner blades. Loosen one screw and take out the bottom cover. Take out the screw caps and rear panel. Remove the trimmer driving bar or the slit blade driving bar with. ASME Safety Valves. ST25 1/4” BSPT/NPT 25-350 PSI 51 17.5 60 On Request ST38 3/8” NPT 25-350 PSI 51 17.5 60 On Request 0 50 100 150 200 PSI SCFM 80 60 40 20 0 0 50 100 150 200 250 300 PSI SCFM 300 200 100 0 The data provided above is for information purposes only and no warranty of accuracy or reliability is given.
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National Standard Taper Pipe Threads Size NPT Chart - Includes both External and internal Pipe Thread Data. The taper rate for all NPT threads is 1⁄16 (3⁄4 inch per foot) measured by the change of diameter (of the pipe thread) over distance. The angle between the taper and the center axis of the pipe is 1° 47'′ 24'″ (1.7899°). Commonly-used sizes are 1/⁄8, 1/⁄4, 3/⁄8, 1⁄/2, 3⁄/4, 1, 1 1⁄/4, 1 1⁄/2, and 2 inch, appearing on pipes and fittings by most U.S. suppliers. Sizes smaller than 1/⁄8 inch are occasionally used for compressed air, while sizes larger than 2 inches are uncommon, due to the use of alternative methods of joining that are used with these larger sizes. NPT is defined by ANSI/ASME standard B1.20.1.
Nominal Pipe Size is loosely related to the inside diameter of Schedule 40 pipe. Because of the pipe wall thickness, the actual diameter of the threads is larger than the NPS, considerably so for small NPS. Other schedules of pipe have different wall thickness but the OD (outer diameter) and thread profile remain the same, so the inside diameter of the pipe is therefore different from the nominal diameter.
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