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Uni-Directional gate valves |
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Knife gate valve is one of the application-specific designs among industrial valves. These valves are designed to handle basically non-clean media with features that ensures minimum contact between moving parts of the valve. This is achieved by having a precision-ground gate that is held between layers of gland packing with almost no contact between the body parts and gate during most of its travel |
| | The seating itself is accomplished with an almost non-sliding motion aided by jams located in the body. Avoiding sliding contact between gate and body permits this valve to handle abrasive particles present in the media much better than conventional designs. Another feature is the beveled bottom edge of the gate (from which it derives the 'knife' in its name) which allows positive closure of the gate even when solid particles settled at the bottom of the body. | Precision ground Gate | In handling abrasive media, deflection cones are generally used in order to avoid direct impingement of the media on the seat surface; hard facing of body or seating parts is also sometimes used. Purge connections which let in suitable fluids at pressures higher than line pressure are Welded-jams with relieved inlet area also sometimes provided in these valves to clean seating surfaces(body purges) and packing area (chest purges). This minimizes abrasive wear and tear during valve opening and closure. Knife gate valves are excellent hopper isolation valves with their ability to cut through flowing powders and close by dislodging any material in the seating area. This is also perhaps the only valve design which can tolerate differential thermal expansion of its parts without affecting its functions, thus making an ideal choice for handling high temperature media. | 
Welded-jams with relieved inlet area |
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