1. Remove through access port with back of clapper first with spring end down. 首先通过检修口拆卸阀瓣的后面及其弹簧末端。
2. Thoroughly clean the seat area and clapper sealing surfaces, check arms, and O-rings for damage, nicks, and debris. 彻底清洗阀座面和阀瓣密封面，止回阀臂和O形环，检查是否有损坏、刻痕和碎片。
3. When the screwdriver is in place, remove the E-clip (Figure F) and pin connecting the structural members and the check clapper will open with no tension. 当螺丝刀就位后，拆卸图F中的E夹和连接结构部件的销钉，则止回阀阀瓣将在没有张力的情况下开启。
英英解释
n.
1. someone who applauds
2. a mobile mass of muscular tissue covered with mucous membrane and located in the oral cavity
3. metal striker that hangs inside a bell and makes a sound by hitting the side
