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بدضعیفمتوسطخوبعالی (بدون رتبه)
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Drum-Mate ™ Drum Pump
Sometimes the best pumping solution is not exactly a “pump” in the traditional sense of the word. The Drum-Mate drum pump is used to pump liquids from standard 55-gallon drums by regulating air flow into the pump from any compressed air source. Pumps of this type are sometimes called “Fluid Displacement Pumps”.
There are no moving parts while removing liquid from a drum. Simply turn the rotating control head, and flow will start.
The pump can dispense up to 16 GPM (60 LPM), up to 250 centipoise, 50 SAE, 1200 SSU. It pressurizes the pump to 7.5 PSI from air inlet pressure up to 150 PSI. A built-in safety valve limits pressurization.
The Drum-Mate drum pump is made of 100% polypropylene plastic. It’s made for use with nonflammable liquids, and can be an inexpensive solution for drum dispensing any nonflammable liquid compatible with polypropylene.
Air is regulated from 7.5 to 150 PSI by a venting valve. A pressure control regulator is available to minimize air wastage.
Operating Position #1 allows pressurized air into the drum.
Operating Position #2 allows the pressure to be “locked” into the pump (by adding force from a second spring to the relief valve). This way the operator can disengage the air pressure line from the pump, move the drum to a different location, and then dispense the liquid (by rotating the cap past Operating Position #1 to Operating Position #3).
Operating Position #4 is the “on” position when connected to a compressor or air tank. In this position, the air is constantly replaced and the pressure remains at 7.5 PSI. Duplex Pump
The “direct acting reciprocating steam pump” was invented by Henry R. Worthington in 1840. It is still used today, often powered by compressed air instead of steam.
DUPLEX PUMPS like the one shown here have two steam and two water cylinders. Only one of each is shown, the other cylinders being directly behind these.
Duplex pumps have no “dead spots” because one or the other steam piston is always under force of steam (or compressed air). The two pistons are about 1/4 cycle out of synchronization with each other
The steam enters the system through the top chamber on the left where the steam valve slides back and forth over the various intake and exhaust pipes. The black hole just under the steam valve is the exhaust vent for used steam.
The back pump controls the steam valve for the pump shown which controls, through the rocker arm in the middle, the steam valve for the piston in back.
On the water end of the pump, on the right here, the lower two valves are the intake valves and the upper valves are the discharge valves. A hydraulic accumulator is usually located just above the pump to smooth the flow and prevent water hammer.
As many as five sets of steam and water cylinders are linked together in various types of reciprocating steam pumps.

Dutch Pumps
For three years, from 1849 to 1852, three huge steam pumping stations were run night and day to drain a lake. The area to be drained, is called the Haarlemmermeer.
All three stations were based on standard Cornish pumps and were built essentially alike. One of them, Cruquius, is still in existence as a museum and is illustrated here.
There are eight pumps surrounding the central steam cylinder, but at Cruquius only seven were actually connected because the steam cylinder could not power all eight.
The cycle shown works as follows: First, steam is introduced into the center of the cylinder (at about 45 P.S.I.) The steam pushes the piston up, pushing the upper valves in the pumps down (two of eight are shown).
About halfway up the inlet steam valve is closed but steam continues to expand and push the piston up. It slows to a stop at the top of the cycle.
Next the exhaust valve is closed and the equilibrium valve is opened. Steam then flows around to the top of the piston and, with the aid of gravity, pushes down on the piston. The upper valves on the pumps move up and water is raised.
The equilibrium valve closes and the cycle repeats about seven times a minute. Ericsson Hot Air Pump
This pump was designed in the 1800’s by John Ericsson, designer of the Civil War battleship Monitor.
The Ericsson Hot Air Pump had many advantages for rural customers: It was reliable, ran on virtually any fuel, had easily replaced parts, and could not explode. (No steam is used, only a few cubic feet of hot air.)
A fascinating series of linkages sequences all the events. The pump works by continuously heating and cooling the same air. The heated air expands and pushes up the TRANSFER PISTON (shaded gray here).
The air is transferred around the edges of Transfer Piston to the space between the top of the transfer piston and the AIR PISTON. Water circulating around the cylinder cools the air, causing it to contract.
The water that cools the air was just brought up from the well. It exits via the outlet pipe. The Air Piston pushes the cooled, contracted air down past the Transfer Piston and the cycle repeats

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