| 摘要 |
<p>The present invention relates to an apparatus for restricting access to port s that may be disposed in a bonnet (104) to house valves (107, 108, 110 and 120 on a railc ar (106). More specifically, the present invention relates to a template (1) that may be lowered over the bonnet (104) of the railcar (106) wherein the template has a plurality of differently sized apertures (40, 42, 44 and 46) to allow access to specially - sized valves (107, 108, 110 and 112). In addition, the valves may be eduction valv es and/or vapor valves, and the apertures (40, 42, 44 and 46) may allow a specific-siz ed nozzle to have access to the eduction valves, the vapor valves or both. The templat e (1) may lower onto the bonnet (104) via a frame that may be rotatably attached to a structure. Further, joints (22, 24) and ball joint connections (26, 28) may be provided to allow the template to be movable so as to precisely fit over the bonnet (104)of th e railcar (106).</p> |
