| 摘要 |
A hydraulic breech mechanism uses a sealed reservoir of fluid to rigidly support the bolt 6 against barrel 2 resisting pressure generated by discharging a cartridge in chamber 3 . Recoil forces cause the high pressure cylinder 7 and barrel assembly 2 and 4 to move relative to the sleeve valve 8 opening communication between reservoirs 9 and 11 . This and subsequent bolt travel displace floating piston 12 compressing spring 13 . During bolt opening any cartridge in chamber 3 will be ejected. With the firing load removed from the bolt 6 the floating piston 12 under influence of spring 13 will pump fluid into the high pressure reservoir 9 , closing the bolt and chambering any round in the loading port. Continued load from spring 13 now returns the high pressure cylinder 7 and barrel assembly 2 and 4 to the original position relative to the sleeve valve locking bolt 6 ready for the next cycle.
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