YJZQ type high-pressure ball valve I. Model Description An internal the threaded ... of 31.5MPa, the nominal diameter 20mm, metric threaded connection type ball valve, the model YJZQ-J20N (2) Nominal pressure of ... .5MPa, nominal diameter 10 mm, connection plate, screw type ball valve, the model YJZQ-J10B (with screws) YJZQ type high-pressure ball valve