第一个,截止止回阀
第二个 SDNR Valves
Globe or Angle type
Also called a stop disc non return valve or screw down stop and check valve. This type of check valve incorporates both the lift check and globe valve design features. The stem is used to regulate the lift of the disc when acting as a check valve, or to hold it in the closed position.螺旋式止回阀