A double check valve assembly shall be installed at each noted location 雙止回閥總成應(yīng)該安裝在每個(gè)指定的位置。
There shall be no brass or bronze parts used within the check valve assembly 在止回閥總成內(nèi)不應(yīng)該采用黃銅或青銅部件。
Series 719 double check valve assembly shall be installed at each noted location 系列719雙止回閥總成應(yīng)該安裝在每個(gè)標(biāo)注的位置上。
The double check valve assembly shall be a watts regulator company series 774x 這種雙止回閥總成應(yīng)該是美國瓦茨調(diào)節(jié)閥公司系列774x 。
Series 774x double check valve assemblies are designed to prevent the reverse flow of polluted water from entering the potable water system 系列747雙止回閥總成用于防止污水回流進(jìn)入飲用水系統(tǒng)中。