蝶式止回阀尺寸,蝶式止回阀

hh46(48,49)x(h)微阻缓闭蝶式止回阀
dh77x-10/16双瓣超薄铸铁对夹蝶型止回阀h76x单向逆止阀dn50-300
蝶式缓闭止回阀
h76x/h76h 对夹蝶式双瓣止回阀
16铸铁对夹式蝶形止回阀蝶式逆止阀单向阀dn50100dn4015寸