Media Coverage
Performance test of the constant pressure valve with flow rate control
function
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Journal of the Hatachi Nogyo Shinko Kyokai (Field Agriculture Development
Association)
No. 454, published on Sep. 28, 1996 |
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Reprinted by permission of the Hatachi Nogyo Shinko Kyokai |
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Performance test of the constant pressure valve with flow rate control
function
The Ministry of Agriculture, Forestry and Fisheries, National Institute
for Rural Engineering; Agricultural Irrigation Research Department
Koji Kitamura, Ken Koizumi, Teruji Miyamoto
Abstract (English translation of the original text)
According to the characteristics of the constant pressure valve with a
flow rate control function confirmed by the results of performance tests,
the following advantages are available when considering the applications
to an agricultural irrigation system design.
(1) Because the valve responds to fluctuations in primary pressure and
end-user usage amount in a stable manner controlling the occurrence of
water hammer caused by a sudden change in water flow, and maintaining a
stabilized, constant pressure characteristic, assured pressure and end-user
flow amount as well as system simplification are possible.
(2) Based on the addition of the variable constant flow rate characteristic
to the constant pressure valve, over-discharge prevention and systematic
water distribution are possible, providing supply-driven flow-rate control
to an integrated irrigation water supply system. Unlike general pressure
reducing valves, this valve maintains a constant flow rate from the point
where the flow amount exceeds the set flow amount, not just cutting off
the flow. This provides an effective use of water for end-consumers when
considering the overall distribution within the range of the set flow rate.
In addition, because end-consumers can adjust the pressure and flow rate
on the ground, water can be used freely with flexibility.
(3) Because the primary pressure is completely shut off to maintain the
constant pressure characteristic even if the usage amount at end-users
reaches zero during the night, the low pressure specification can be applied
to the terminal design of the pipeline, reducing the pipe material costs.
For details of this constant pressure valve with flow rate control function,
please refer to
Constant Pressure Valve (pressure reducing valve) UFSP type
Constant Pressure Valve (pressure reducing valve with over-discharge cutoff
function) UFSP-C type |
