knapsock sprayer
Knapsack sprayers are widely use in all rice growing countries. Knapsack sprayers come in many different forms but the basic components and requirements for use are the same for all. Some units use a pressurized tank system but the majority do not.
Components of a knapsack sprayer
The components of a knapsack sprayer are similar as for a broad acre boom sprayer.
Knapsack sprayers are available in many different configurations they all comprise of the same basic components. These components are:
Image
Tank to hold chemical
Hand pump to create pressure
Filtration system behind the nozzle tip to reduce blockages
Control Valve to control pressure and turn of the sprayer
Nozzle tip to control application rate an produce the correct size droplets
Tank
Tanks come in many different shapes and sizes. Most knapsack tanks hold from 10-20lites of fluid must be non corrosive, able to be sealed and very durable.
Hand Pumps
Most knapsacks use diaphragm or piston type pump. The hand pump is normally mounted to one side of the tank although some versions have above tank handles. These are more difficult to use and tend to cause greater variation in spray pressure
Control valves and pressure regulation
Most knap sack sprayers have one control valve which is the on off switch. The on/off switch also often acts as the pressure regulator. Pressure tends to fluctuate between the down stroke of the pump and the upstroke- high on the down stroke and low on the upstroke. It will also tend to fluctuate as a person spraying becomes tired and finds it more difficult to maintain the initial pressure.
Several companies are now manufacturing regulator valves that are intended specifically for knapsack sprayers. They are durable, accurate and relatively inexpensive. Automatic pressure relief valves attach in a lance or boom line, usually directly before the nozzle. They do not open until their rated pressure is reached. Once the valve does open, excess
Components of a knapsack sprayer
The components of a knapsack sprayer are similar as for a broad acre boom sprayer.
Knapsack sprayers are available in many different configurations they all comprise of the same basic components. These components are:
Image
Tank to hold chemical
Hand pump to create pressure
Filtration system behind the nozzle tip to reduce blockages
Control Valve to control pressure and turn of the sprayer
Nozzle tip to control application rate an produce the correct size droplets
Tank
Tanks come in many different shapes and sizes. Most knapsack tanks hold from 10-20lites of fluid must be non corrosive, able to be sealed and very durable.
Hand Pumps
Most knapsacks use diaphragm or piston type pump. The hand pump is normally mounted to one side of the tank although some versions have above tank handles. These are more difficult to use and tend to cause greater variation in spray pressure
Control valves and pressure regulation
Most knap sack sprayers have one control valve which is the on off switch. The on/off switch also often acts as the pressure regulator. Pressure tends to fluctuate between the down stroke of the pump and the upstroke- high on the down stroke and low on the upstroke. It will also tend to fluctuate as a person spraying becomes tired and finds it more difficult to maintain the initial pressure.
Several companies are now manufacturing regulator valves that are intended specifically for knapsack sprayers. They are durable, accurate and relatively inexpensive. Automatic pressure relief valves attach in a lance or boom line, usually directly before the nozzle. They do not open until their rated pressure is reached. Once the valve does open, excess