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Reference.com/Encyclopedia/Piston valve (806 words) |
 | A piston valve is a device used to control the motion of a fluid along a tube or pipe by means of the linear motion of a piston within a chamber or cylinder. |
| It is difficult to lubricate slide valves adequately in the presence of superheated steam |
| Where poppet valves are used, a different gear, such as Caprotti valve gear is needed. |
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Valve gear at AllExperts (699 words) |
| The Walschaert valve gear on a steam locomotive (a PRR E6s). |
| The valve gear of a steam engine is the mechanism that operates the inlet and exhaust valves to admit steam into the cylinder and allow exhaust steam to escape, respectively, at the correct points in the cycle. |
| A key flaw in all of these valve gears is that the same valve motion operates the exhaust valve as well as the inlet valve, making it much harder to achieve the desirable valve events on both the inlet and the exhaust at the same time. |
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