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2. Flow coefficient - Wikipedia

   en.wikipedia.org/wiki/Flow_coefficient

   A simplified version of the definition is: The k v factor of a valve indicates "The water flow in m 3 /h, at a pressure drop across the valve of 1 kgf/cm 2 when the valve is completely open. The complete definition also says that the flow medium must have a density of 1000 kg/m 3 and a kinematic viscosity of 10 −6 m 2 /s , e.g. water.

3. Gresley conjugated valve gear - Wikipedia

   en.wikipedia.org/wiki/Gresley_conjugated_valve_gear

   LNER Class V2 4771 Green Arrow.Note Gresley conjugated valve gear located ahead of the piston valves, driven from the valve spindles. The Gresley conjugated valve gear is a valve gear for steam locomotives designed by Sir Nigel Gresley, chief mechanical engineer of the LNER, assisted by Harold Holcroft.

4. Hackworth valve gear - Wikipedia

   en.wikipedia.org/wiki/Hackworth_valve_gear

   The Hackworth valve gear is a design of valve gear used to regulate the flow of steam to the pistons in steam engines. It is a radial gear , with an actuating lever driven from the crank. The drive may be taken directly from the crank or indirectly via a return crank (as in all pictures).

5. Valve stem - Wikipedia

   en.wikipedia.org/wiki/Valve_stem

   An inflator stem is not used; instead, a removable cap on a valve stem embedded in the tire rim is fitted, with only the cap visible. When inflating the tire, the cap is first removed, typically with a coin, and then a "portable" dedicated inflator stem is screwed onto the valve stem. Through the inflator, the tire is inflated as usual.

6. Piston valve (steam engine) - Wikipedia

   en.wikipedia.org/wiki/Piston_valve_(steam_engine)

   The valve is next opened by moving it to the right, allowing the clear space in the middle of the valve to align with the channel in the cylinder above it. Piston valves are one form of valve used to control the flow of steam within a steam engine or locomotive .

7. Valve gear - Wikipedia

   en.wikipedia.org/wiki/Valve_gear

   Deeley valve gear - fitted to several express locomotives on the Midland Railway. The combination levers were driven, as normal, from the crossheads. Each expansion link was driven from the crosshead on the opposite side of the engine. Young valve gear - used the piston rod motion on one side of the locomotive to drive the valve gear on the ...

8. Valve guide - Wikipedia

   en.wikipedia.org/wiki/Valve_guide

   The upper part of the valve stem, within the rocker box, is lubricated by oil. If this oil travels unchecked along the valve stem, engine HC emissions will become excessive. To control this, an elastomeric seal is fitted over the top of the valve guide. These may wear or stiffen with age, so are usually replaced whenever valves are removed for ...

9. Valve seat - Wikipedia

   en.wikipedia.org/wiki/Valve_seat

   Valve seats are often formed by first press-fitting an approximately cylindrical piece of a hardened metal alloy, such as Stellite, into a cast depression in a cylinder head above each eventual valve stem position, [1] and then machining a conical-section surface into the valve seat that will mate with a corresponding conical section of the ...