H42H、H42W立式止回閥正常處于關閉狀態，由于管線中進口端介質的壓力作用，而克服彈簧阻力使閥門開啟。當進口端介質壓力低于出口端時，彈簧將閥芯推向閥座而使閥門關閉，阻止介質逆流，故起止回作用。
本閥門由于采用彈簧支撐閥芯，故采用立式安裝或臥式裝均可。應用規范設計與制造GB/T12235連接端尺寸結構長度GB/T12221法蘭尺寸JB/T79檢驗與試驗JB/T9092材料碳鋼GB/T12229不銹鋼GB/T12230合金鋼Q/ZB66標志GB/T12220供貨JB/T7928性能規范型號公稱
壓力試驗壓力工作溫度(℃)強度
(水)Mpa密封
(水)空氣(Mpa)低壓密封
(空氣)MpaH42W-161.62.41.80.6≤200H42W-252.53.82.80.6≤200H42W-404.06.04.40.6≤200主要外形尺寸型號公稱通徑 DN尺寸(mm)LDD1D2HbZ-ΦdH42H/W-161513095654577144-1420150105755577144-1425160115856580164-14321801351007885164-18402001451108595164-1850230160125100105164-1865290180145120120184-1880310195160135130208-18100350215180155140208-18125400245210185155228-18150480280240210180248-232006003352952652152612-23H42H/W-251513095654577164-1420150105755580164-1425160115856585164-14321801351007895188-184020014511085105188-1850230160125100120208-18652901801451201302128-1880310195160135140228-18100350230190160155248-23125400270220188180288-25150480300250218215308-252006003603102789733412-25