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H A Humphrey patented both four-stroke and two-stroke versions of his engine. [5] The four-stroke design required mechanical interlocks to the inlet valves, so that the exhaust and scavenge valves open once during the cycle to allow scavenging of the exhaust, but not during the compression cycle afterwards. A two-stroke cycle was also possible ...
The Mullard Radio Valve Co. Ltd. of Southfields, London, was founded in 1920 by Captain Stanley R. Mullard, who had previously designed thermionic valves (US term: vacuum tube) for the Admiralty before becoming managing director of the Z Electric Lamp Co. [2] The company soon moved to Hammersmith, London and then in 1923 to Balham, London.
The valves are typically operated by a camshaft rotating at half the speed of the crankshaft. It has a series of cams along its length, each designed to open a valve during the appropriate part of an intake or exhaust stroke. A tappet between valve and cam is a contact surface on which the cam slides to open the valve. Many engines use one or ...
Air pilot control: converting from air to oil results in locking of the cylinder. Shifting the four-way valve to either extreme position applies the air pilot through the shuttle valve, holding the two air-operated valves open and applying oil under air pressure to the corresponding side of the cylinder. Positioning a manual valve to neutral ...
A vacuum delay valve is a valve with a small orifice, which delays a vacuum signal. These are commonly used in automobiles to alter the behavior of vacuum switches, ...
Humphrey is a city in Platte County, Nebraska, United States. The population was 760 at the 2010 census. History. Humphrey was platted in 1880 when the Omaha ...
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