Pressure Reducing Valve.
Section.
Pump-chain. An endless chain with discs forming valves at proper distances, working on two wheels, one above and one below, and passing down outside and returning upward through a wooden tube like a belt.
Pump-cheeks. A forked piece serving as a fulcrum for the handle of a pump.
Pump-well. A compartment extending from a ship’s bottom to the lower or the upper deck, as the case may be, to contain the pump stocks, etc. The bilge water collects in the limbers and is discharged through a spout called the pump-dale.
Rain-gauge. A vessel graduated to measure the fall of rain in a given period.
Reducing-coupling. A fitting for connecting two sizes of threaded pipe.
Resistance. The force that a pump has to work against, caused by gravity, friction, head of water, etc.