501B 系列頂部導向型單座調(diào)節(jié)閥，采用流體壓力平衡型閥芯結(jié)構(gòu)，因此與 501T 頂部導向型單座調(diào)節(jié)閥相比，能夠承受較高的工作壓差，同時由于采用平衡密封環(huán)使控制閥動態(tài)穩(wěn)定性更好；與 501G 套筒導向型單座調(diào)節(jié)閥相比，更能適應流體中含有一些顆粒雜質(zhì)的場合，而且不易造成閥芯的卡死。
501B series is top guided single seated control valves, Compared with 501T series top guided single seated globe valves, Its dynamic stability is better with balance seal and could work smooth under higher pressure drop. Compared with 501G series cage guided single seated control valves, it's better suited for applications involving fluid with entrained particles, and its trim will not be locked.
