ratchet valve

ratchet valve
A valve normally used in the wing-flap system to retain pressure in the flap-actuating cylinder, thereby preventing the flaps from drooping while they are up when the airplane is on the ground and from creeping while they are down when the airplane is in flight. The valve is installed in the wing-flap system between the actuating cylinder and the selector valve. A typical ratchet valve has three spring-loaded adjustable valves as shown in the illustration. Ports A and D are connected to the selector valve, and ports B and C to the actuating cylinder. Valves E and F are primarily relief valves, whereas valve G is a temperature-expansion relief valve. When the selector is in the up position, fluid under pressure from the selector valves enters port A and unseats valves E and F. The fluid can then flow out through port B to the actuating cylinder and move the flaps up. Fluid from the opposite end of the actuating cylinder enters port C and flows around valve F, out through port D, and to the return line through the selector valve. When the flaps reach the full up position, valve E seats. Even though the pressure applied at port A decreases through a leak-type selector valve, the pressure will be retained in the actuating cylinder by valve E; hence, the flaps remain up. When the selector valve is placed in the down position, fluid under pressure enters port D, opens valves E and F, and flows out through port C to the actuating cylinder. Return fluid enters port B and flows around valve E and out through port A to the return line.

Aviation dictionary. 2014.

Игры ⚽ Нужно сделать НИР?

Look at other dictionaries:

  • PlayStation 3 — PS3 redirects here. For other uses, see PS3 (disambiguation). PlayStation 3 …   Wikipedia

  • Wrench — For other uses, see Wrench (disambiguation). A set of chrome vanadium metric wrenches, open at one end, box/ring at the other. This type is commonly known as a combination wrench. A wrench or spanner is a tool used to provide grip and mechanical… …   Wikipedia

  • List of PlayStation 3 games — See also: Category:PlayStation 3 only games Official PlayStation 3 Banner used on current and upcoming PlayStation 3 game covers, since September, 2009. With online multiplayer support This is a list of retail PlayStation 3 games released or… …   Wikipedia

  • Meillerwagen — Manufacturer Gollnow Son Assembly Germany Class trailer …   Wikipedia

  • Список игр на Sony PlayStation 2 — Список вышедших и планируемых к выходу игр для PlayStation 2. Содержание 1 0 9 2 A 3 B 4 C 5 D …   Википедия

  • Clutch — For other uses, see Clutch (disambiguation). Rear side of a Ford V6 engine, looking at the clutch housing on the flywheel …   Wikipedia

  • List of best-selling video games — This is a list of video games that have sold or shipped at least one million copies, including the top ten best selling franchises. ConsolesAtariAtari 2600Atari 2600 games that have sold or shipped at least one million copies. * Pac Man (7… …   Wikipedia

  • Spike Video Game Awards — Los Spike Video Game Awards (VGA) son unos premios anuales presentados por Spike TV y que selecciona los mejores videojuegos del año. La primera edición se celebró en 2003 y desde entonces ha concedido premios al mejor videojuego del año, y los… …   Wikipedia Español

  • gamescom — Официальный логотип gamescom …   Википедия

  • Paintball marker — A paintball marker, also known as a paintball gun, is the central or main piece of equipment in the sport of paintball. Markers make use of an expanding gas such as carbon dioxide, compressed air or nitrogen dioxide to propel paintballs through… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”