| 摘要 |
Invention herewith described refers to the secure parallel slide gate valves with special protection of screw fittings and anchor pins containing a mechanism to accommodate protection mechanism against the unauthorized removal of the anchor pins from the secure parallel slide gate valves which is made possible by the special covered fixture located on the base plate and covers the part in front of the anchor pins. The lid has covered screw fittings as well as plain bearings holding the jackscrew from the secure parallel slide gate valves driving unit. The supporting plate, intermediate and covering frame and the smooth running valve plate of the secure parallel slide gate valves are made of polyethylene.
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