| 单词 | piston valve |
| 释义 | > as lemmaspiston valve piston valve n. (a) a valve in a piston, as in that of a piston pump; (b) a valve consisting of a small piston sliding back and forth in a tube, opening or closing a hole or holes in the tube wall, as alongside the cylinder of a steam engine or in a brass musical instrument (cf. sense 3b). ΘΚΠ society > occupation and work > equipment > machine > parts of machines > piston > [noun] > parts of piston valve1735 piston rod1753 piston ring1754 piston head1824 gland1839 junk ring1839 slipper block1881 tail-rod1894 scraper ring1918 society > occupation and work > equipment > machine > machines which impart power > engine > steam engine > [noun] > parts of > valves > for regulating steam piston valve1735 induction valve1847 cross-head brasses1865 long slide1875 trip valve-gear1903 1735 M. Clare Motion of Fluids 54 If the Bore of this Machine be full of Air only, before Water can be drawen, that Air must be exhausted; which may be done, if the Piston Valve be tight, by the ordinary Motion thereof. 1815 J. Smith Panorama Sci. & Art II. 6 To improve the air-pump, Smeaton..covered the top of the barrel..by which contrivance he took off the pressure of the atmosphere from the piston-valve. 1960 A. H. Benade Horns, Strings, & Harmony viii. 181 The other brasses have a set of ‘piston valves’..which, when depressed, add a definite length of tubing to the instrument bore. 1990 Allegro Winter–Spring 12/3 In other areas of band music we find a predominance of rotary valve instruments, usually tuned in C as opposed to the piston valve instruments in B flat commonly played in the UK. 2002 Tractor & Machinery Dec. 15/1 The 10 ton piston valve compound Marshall steam roller..was restored in three months. < as lemmas |
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