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Journal of the Hatachi Nogyo Shinko Kyokai (Field Agriculture Development Association) No. 483, published on Feb. 28, 1999

Reprinted by permission of the Hatachi Nogyo Shinko Kyokai

Performance tests on constant flow rate valve with liquid level control function

The Ministry of Agriculture, Forestry and Fisheries, National Institute for Rural Engineering; Agricultural Irrigation Research Department

Abstract (English translation of the original text)
(1) Liquid level control function (open/close feature)
Trials performed on the liquid level-1 and liquid level-2 regulator valves indicated that both valve types steadily controlled the set liquid level. The liquid level-1 regulator valve maintained the set water level at a constant level. The liquid level-2 regulator valve remained closed even when the water level dropped from HWL, and started the supply of water at the moment of reaching LWL.
Each control feature can be effectively employed by selecting the type appropriate to the purpose of use.
(2) Excess flow cut and variable flow control functions
Using a valve with excess flow cut and variable flow control functions provides a systematic distribution of appropriate water flow, cutting excessive flow above the set flow rate even with the valve fully open.
Moreover, based on the addition of the variable constant flow rate feature on the liquid level regulator valve, automation and ease of control of the complete irrigation water supply system is possible due to the ability to optionally set a systematic water distribution rate.


For details of this constant flow rate valve with liquid level control function, please refer to
Float-Type Regulator Valve UFSF type
Liquid Level-1 Regulator Valve UFSB-1W type
Liquid Level-1 Regulator Valve (with over-discharge cutoff function) UFSB-1W-C type
Liquid Level-2 Regulator Valve UFSB-2W type
Liquid Level-2 Regulator Valve (with over-discharge cutoff function) UFSB-2W-C type