hinge post (обратный клапан)

[artmonster]

Посоветуйте пож-та, грамотный перевод словосочетания hinge post.

Horizontal Lines: Valves installed in horizontal lines must be bolted, threaded, or coupled in place with the stationary support "HINGE POST" in the vertical position -i.e., in such a manner that the bolts protruding through the valve body are at the top and bottom of the installed valve, perpendicular to the flow.
Vertical Lines- In the downward or upward position, no special attention need be given to the hinge post position. The only exception being when mounted directly downstream of an elbow In this case, the flow velocity will be higher at the outer circumference of the elbow Therefore, the HINGE POST should be mounted perpendicular to the outermost portion of the elbow/
Заранее спасибо