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Title: |
1903 Article- Miller Improved Gas Engine Co., Horizontal Gas Engine |
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Source: |
The Iron Trade Review, 01 Jan 1903, pg. 72 |
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Insert Date: |
10/29/2013 1:58:48 PM |
This engine might properly be termed a double four-cycle type so timed that one impulse every rotation of the crank shaft is obtained. The latest improvements consist in a balance exhaust valve which opens against the pressure and closes in a corresponding manner. The upper end of the valve stem is fitted to a piston which works in a chamber opening upward, the valve proper seating against the lower part of the explosion chamber, so that every time it is subjected to the heat of an explosion it is alternately exposed to a draft of cool air entering the engine which counteracts the effect of the heat imparted to the valve stem. This treatment does not allow
the stem to become overheated and ensures a long working life. The stem being guided from above by the piston working in the chamber and surrounded by a circulation of water it can be thoroughly lubricated and maintained in good condition.
The inlet valves are placed on the side of the cylinder and are operated by the suction and have vacuum cups that control the easy and quiet seating of the valves. The governor is equipped with a piston controlled by the vacuum created by a small air pump running in connection with the engine and from this vacuum the speed of the engine is maintained.
The mixing valve which is also a part of the governor is so arranged that it will open up a passage for air and one for gas, the two having direct access to the same vacuum chamber and each being of a proper size to admit and maintain a uniform mixture of gas and air regardless of what the requirement may be and thus enable the governor to administer the proper mixture at all times. The compensating valve is a device that automatically admits or ejects air, as the case may be, to compensate for the requirements of the gas as it may change in its quality.
There is an air filter chamber through which the air passes to act upon the piston in the governor and the object of the filter is to clear the dust from the air where it would otherwise clog up the needle valve that controls the throttling and thus cause the engine to lose speed. The jump spark is employed for igniting the explosive mixture and the company has devised a new sparking plug which is claimed to be indestructible. This type of engine is manufactured in many sizes (units up to 250 h. p. being in operation) by the Miller Improved Gas Engine Co., of Springfield, 0. |
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