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Journal of the Japanese Society of Irrigation, Drainage and Reclamation Engineering Vol. 64, published on Mar. 1, 1996

Reprinted from Journal of the Japanese Society of Irrigation, Drainage and Reclamation Engineering Vol.64

Pipe pressure control techniques by advanced pressure-reducing valve

	Hitone Inagaki		United Graduate School of Agricultural Sciences, Kagoshima University
	Masato Kunitake		Faculty of Agriculture, Miyazaki University

Abstract (English translation of the original text)
On the issue of necessary improvement of conventional automatic pressure-reducing valves, an inline pressure reduction system employing a combination of conventional automatic pressure-reducing and safety valves and/or airbags has been offered aimed at eliminating the continuance of hydrostatic pressure after water flow is stopped, and eliminating water hammer pressure on the pressure-reducing valve. Currently, with the addition of improvements to the operation mechanism of the automatic pressure-reducing valve which allow serial arrangement of the valves, an actual system has been produced and hydraulic testing has been performed.
The trial results produced the following confirmations: (1) A single pressure-reducing valve allowed cut off of hydrostatic pressure of the upstream side, and (2) several valves arranged in a series is also possible.
With the introduction of these new-type automatic pressure-reducing valves on an inline pressure reduction valve-type system, it is expected that there will be greater adoption of polyvinyl choride piping due to the ability for the progressive reduction of inline pressure.

Keywords:

Automatic pressure-reducing valve, Inline pressure reduction-type system, hydraulic testing, serial arrangement, systematic internal pressure, polyvinyl chloride piping.

For details of this advanced pressure-reducing valve, please refer to Constant Pressure Valve (pressure reducing valve) UFSP type.