| 单词 | trap-valve |
| 释义 | > as lemmastrap-valve trap-valve n. see quot. ΘΚΠ society > occupation and work > equipment > pump > [noun] > valves clap1626 clack1634 clapper1769 butterfly valve1809 suction valve1831 clack-valve1850 shoe-valve1858 butterfly clack1859 trap-valve1877 1877 E. H. Knight Pract. Dict. Mech. Trap-valve, a valve hinged on one side of its seat, and opening and closing like a shutter or trap-door, a clack-valve. < as lemmas |
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