【低温止回阀用途】低温止回阀是指依靠介质本身流动而自动开、闭阀瓣，用来防止介质倒流的阀门，又称逆止阀、单向阀、逆流阀、和背压阀。止回阀属于一种自动阀门，其主要作用是防止介质倒流、防止泵及驱动电动机反转，以及容器介质的泄放。止回阀还可用于给其中的压力可能升至超过系统压的辅助系统提供补给的管路上。止回阀主要可分为旋启式止回阀（依***旋转）与升降式止回阀（沿轴线移动）。低温止回阀主要外形和连接尺寸公称通径尺寸mminLDD1D2bfn-ΦdHDH44Y-150Lb502203152120.592161.64-19180803241192152.5127191.64-191901004297229190.5157241.68-192031255330254216186241.68-222291506356279241.5216261.68-222572008495342298.5270291.68-2229225010622406362324311.612-2535530012698483432381321.612-25396DH44Y-300Lb50226716512792231.68-19178803318210168.5127291.68-222161004356254200157321.68-222411255400279235186351.68-222671506444318270216371.612-223052008533381330270421.612-2536825010622445387324481.616-2939430012711521451381511.616-32445DH44Y-600Lb50229516512792336.48-19203803359210168127366.48-222351004435273216157456.48-252861255511330266.5186526.48-292921506562356292216556.412-293302008664419349270636.412-3238125010791510432324716.416-3545730012842559489381746.420-35584)