automatic return trap自动回水隔汽阀
boiler return trap锅炉回水隔汽具
alternating return trap反复回水弯
automat theiric return trap加气混凝土砌块设备自动回水隔汽阀
non-return trap止回汽水阀
non return trap不可复汽阱;止回汽水阀
automat justic return trap主动回水隔汽阀
dump trap liquid return液体回体