| 251 / | HD | VALVES AND VALVE ACTUATION |
| 157 | DF | WITH MEANS TO INCREASE HEAD AND SEAT CONTACT PRESSURE {8} |
| 193 | DF | .~ Gate valve {3} |
| 195 | | .~.~ Bifaced {4} |
| 196 | DF | .~.~.~> In both closed and open positions |
| 197 | DF | .~.~.~> Faces pressed by subsequently movable expander {2} |
| 200 | DF | .~.~.~> Carried expander contacts valve casing {1} |
| 202 | DF | .~.~.~> Faces or carrier contact stationary expander |