. Chemical weed-control equipment. Weeds; Spraying; Spraying equipment. A good valve for boom control is a spring-loaded poppet type, with ratchet handle and double eccentric. Left and Center: %-inch and %-inch poppet valves. A small line tied to the top hole in the ratchet handle is run to the opera- tor's seat. The valve is opened and closed by pulling the line. A pull through about 45 degrees turns the eccentric and opens Nozzles with either male or female threads are available, usually %-inch pipe size. The two types most commonly used are those giving either a flat, fan- shaped
. Chemical weed-control equipment. Weeds; Spraying; Spraying equipment. A good valve for boom control is a spring-loaded poppet type, with ratchet handle and double eccentric. Left and Center: %-inch and %-inch poppet valves. A small line tied to the top hole in the ratchet handle is run to the opera- tor's seat. The valve is opened and closed by pulling the line. A pull through about 45 degrees turns the eccentric and opens Nozzles with either male or female threads are available, usually %-inch pipe size. The two types most commonly used are those giving either a flat, fan- shaped spray, or a cone-shaped spray. The tip, or orifice disk, for either type, may be changed by unscrewing it from the nozzle body. Or the opening may be cut in the nozzle itself. If this is done, the entire nozzle must be replaced in order to change the size of the orifice. Most nozzles have small, removable screens to prevent plugging. A relatively new type of spray appli- cator is now being manufactured and used for many spraying jobs. It operates on the impulse principle, much the same as the whirling lawn sprinkler. Two noz- zles are mounted on short arms and set at such an angle that the discharge of the valve. The handle is then released and the ratchet returns. Another pull turns the eccentric to close the valve. Re- leasing the handle returns the ratchet to its original position. Right: A 1-inch valve with quarter-turn operation. When operated by remote control, a stiff rod is used to push and pull the valve arm for opening and closing. liquid causes the arms and body of the mechanism to revolve and throw the spray in a large circle. The device is gen- erally mounted in an inverted position on the end of a 10- to 15-foot pipe which carries the liquid spray. The pressure applied to the machine ranges from 200 to 300 psi, and causes the device to re- volve at a much faster speed than the ordi- nary lawn sprinkler. This is necessary to increase atomization of the liquid and
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Keywords: ., bookcentury1900, bookpubli, booksubjectspraying, booksubjectweeds
