waste-treatment valve的意思|示意

放泄阀 ... 放泄道 discharge passage 放泄阀 ablassventil; bdv; bleed valve; blowdown valve; blowoff valve; discharge valve; drain valve; drainage valve; draining valve; drainvalve; dump valve; escape ale; escape valve; leak-off valve; purge valve; release valve; sectioning valve; unloading valve; waste valve; waste-treatment valve 放泄杆 drain stem ...