| 摘要 |
A blowout preventer having a body and bonnets hinged thereto with throw latches for securing the bonnets to the body, wedges between the body and the hinges for adjusting the tilt of the bonnet and the position of the hinge side of the bonnets when closed and wedges between the body and the latches for adjusting the position of the latch side of the bonnets when closed.
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