On direct air-cooled engines this is not a concern for the bellows thermostat that controls a flap valve in the air passages.
12.
Commentators observe that the South Devon system omitted the iron weather flap that was used on the Dalkey line to cover the flap valve.
13.
This lifted the plunger, which acted as a suction pump within the cataract to refill the plunger box, through a flap valve from its surrounding cistern.
14.
The delay pellet continues to burn and after between 3 and 4 seconds burns out and produces a flash that forces aside a flap valve allowing ignition.
15.
Later in 1808, Jacob Degen built an ornithopter with flap valves, in which the pilot stood on a rigid frame and worked the wings with a movable horizontal bar.
16.
In 1894 H�rbiger had an idea for a new design of blast furnace blowing engine : he replaced the old and easily damaged leather flap valves with a steel valve.
17.
On the 32 and 320, the engine exhaust exits above the waterline, usually via a rubber flap valve, and with no marine silencer used in the system due to lack of space available.
18.
"' Double dump valves "', also known as double flap valves or double flap gates, are a type of airlock valve commonly used in industrial applications as a component in bulk material handling applications.
19.
The original tidal drainage channels were augmented by new ditches, and flap valves in the sea walls let water drain out at low tide and prevent the sea or tidal river from entering at high tide.
20.
Anyway-I think I would install the same contraption that is use to vent a cooker hood-which is a 4 " PVC pipe with a flap valve in it that closes when the cooker hood is not venting.
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