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Design and development of a dual purpose unloading valve for power operated sprayers.
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Agricultural production in India has been able to keep pace with the ever
increasing population and maintain food security. Consequently, several new
and improved equipment have been introduced in agriculture to increase the
yield and to save valuable inputs in farm. Among various types of sprayer in
use, a power operated sprayer becomes more and more popular with unavailability
of labour, less time available for pesticide spraying and availability of improved
and advanced power operated sprayers. Power operated sprayers are equipped with the
pressure relief valve to protect the system from overload and maintain constant
pressure relief valve runs the power source continuously on load. This leads to
undue loss of power when system is not operating as during turning and orchard
spraying. Test results of the ASPEE control valve proved that there was no significant
variation in power consumption on load as well as on unload. In addition,
it requires modifications as pressure fluctuations was observed at all pressure
levels that is not feasible for spraying. At recommended operating pressure of
1.4 Mpa, overall efficiency was around 35 percent for both nozzles on load and
unload. Operating parameters for the DPU-valve were fixed from the control valve
testing. A new DPU-valve was designed for maximum pressure of 2.8 Mpa and discharge
of 36 1/min. Test results of the DPU-valve with three pumps, HSP (discharge 12 1/min
and maximum pressure 2.8 Mpa with 1 hp power consumption), HDP (discharge 36 1/min
and maximum pressure 2.8 Mpa with 2 hp power consumption), and HTP (discharge 36 1/min
and maximum pressure 2.8 Mpa with 3 hp power consumption) showed that power
consumption on load and unload was as high as 1.7 Kw for HTP. Pressure
fluctuation was observed for HSP and HDP beyond 2.1 Mpa pressure. This may be
due to over design of the orifice area as it was designed for discharge of 36 1/min.
Operating pressure remained constant at all pressure levels for HTP. Overall
efficiency for both ASPEE control valve and DPU-valve was independent of the type
of nozzle and increases at decreasing rate with increase in pressure.
In addition, overall efficiency was observed nearly same on load and unload.
SOURCE:
Agriculture Sprayers and Dusters by ASPEE Group Of Companies, India.
Visit www.aspee.com
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RESOURCE BOX
This article is written by Shri. Pravin Sopan Barhate of
Indian Institute of Technology, Kharagpur on behalf of
ASPEE Agriculture Research and Development Foundation.
ASPEE Group of Companies is the leading manufacturer and exporter
of Agriculture Sprayers and Dusters
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