体中。标准型旁路带止回功能。
其它旁路尺寸可按要求制作；最大的旁路流量取决于最大的Kv值。
ZDL-PN16-C-25,ZDL-PN16-C-32,ZDL-PN16-C-40,ZDL-PN16-C-50,ZDL-PN16-C-65,ZDL-PN16-C-80,
ZDL-PN16-C-100,ZDL-PN16-C-200,ZDL-PN16-C-250,ZDL-PN16-C-300,ZDL-PN16-C-350,ZDL-PN16-C-400,
ZDL-PN16-P-25,ZDL-PN16-P-32,ZDL-PN16-P-40,ZDL-PN16-P-50,ZDL-PN16-P-65,ZDL-PN16-P-80,
ZDL-PN16-P-100,ZDL-PN16-P-200,ZDL-PN16-P-250,ZDL-PN16-P-300,ZDL-PN16-P-350,ZDL-PN16-P-400,
ZDL-PN16-R-25,ZDL-PN16-R-32,ZDL-PN16-R-40,CCLAIR,Z