为便于安装，制造商设计了一个环形螺栓安装面，以使与其它设备的法兰安装相配合，这使得筒形法兰的制造更容易。

For ease of installation, the manufacturer designs a circular bolts, to install the equipment installation of flange with other match, which makes the cylindrical flange manufacture more easily.

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该活塞部分（102）还包括形成于该配合面（105）中且适 于接纳基本上环形的嵌件（120）的一部分的基本上环形的嵌件腔室 （126）。

The piston portion (102) further includes a substantially annular insert chamber (126) formed in the mating face (105) and adapted for receiving a portion of a substantially annular insert (120).

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