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Liquid Level-1 Regulator Valve

Liquid Level-1 Regulator Valve
UFSB-1W type

Maintains set liquid level by opening and closing of a ball tap

The set water level is reliably maintained by opening and closing of a ball tap.

The unique closure mechanism realizes complete water shutoff performance and leakage prevention when fully closed.

The pilot valve does not have any minute, fixed restriction passage like a needle valve, and is therefore clog-resistant.

Due to its simple construction, troublesome adjustments are unnecessary. Being excellent in durability and practically maintenance-free, using this valve reduces maintenance costs.

Liquid Level-1 Regulator Valve

Patented in Japan, U.S.A., other



Rated pressure



A ball tap is connected by piping to the pilot valve, and the pilot valve is driven by the opening and closing of the ball tap at the set water level to automatically adjust the main valve opening and maintain the set water level.


When the water level rises to the set water level, the ball tap floats upward and closes, causing pilot A valve to open and pilot B valve to close, thereby raising the pressure on the top of the main valve to inlet pressure P1 and closing the main valve.
When the water level drops and the ball tap opens, pilot A valve closes and pilot B valve opens, causing the pressure on the top of the main valve to be released, thereby opening the main valve and starting the supply of water.


Inlet pressure (Primary pressure)
Max. 1MPa (For JIS 10K standard)

Operating differential pressure
50kPa or more

Liquid Level-1 Regulator Valve /  Flow rate characteristics

Example application

Liquid Level-1 Regulator Valve / UFSB-1W-150
City water filtration plant in Tokyo

Selection chart/Outer dimensions

Please refer to Common specifications & Outer dimensions.

Liquid Level-1 Regulator Valve with over-discharge cutoff function is also available.
For details, please refer to this page.

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