| 摘要 |
PCT No. PCT/GB84/00045 Sec. 371 Date Oct. 19, 1984 Sec. 102(e) Date Oct. 19, 1984 PCT Filed Feb. 17, 1984 PCT Pub. No. WO84/03343 PCT Pub. Date Aug. 30, 1984.A valve plate for a plate-type non-return valve includes at least one valve closure portion and at least one resilient flexible guide arm connecting with the valve closure and the guide arm or arms are configured to include a continuously curved portion generally extending as a spiral from a central hub. |
