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Differential Pressure Regulator Valve

Differential Pressure Regulator Valve
UFSD type

Maintains set differential pressure between inlet and outlet pressures

The excellent pilot valve mechanism provides rapid response under any condition and maintains the set differential pressure between inlet pressure and outlet pressure.
This valve is most suitable for applications such as maintaining constant pump head, and controlling differential pressure between upstream and downstream sides of a chilled/hot water circulation system (closed circuit method) for air-conditioning.

The pilot valve does not have any minute, fixed restriction passage like a needle valve, and is therefore clog-resistant.
And, even if clogging by foreign material occurs, the built-in self-cleaning mechanism causes the clogged valve part to open automatically to remove the foreign material.

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

Differential Pressure Regulator Valve

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



Rated pressure



Intermediate pressure Pe, between inlet pressure (primary pressure) P1 and outlet pressure (secondary pressure) P2, is formed inside the pilot valve and is transmitted to the top of the main valve to maintain an appropriate main valve opening.


When differential pressure (P1-P2) between inlet pressure and outlet pressure rises above the set pressure, pilot A valve closes and pilot B valve opens to reduce intermediate pressure Pe, causing the main valve to open and the differential pressure (P1-P2) to be reduced to the set pressure.
Conversely, when differential pressure (P1-P2) between inlet pressure and outlet pressure drops below the set pressure, pilot A valve opens and pilot B valve closes to raise intermediate pressure Pe, causing the main valve to become restricted and the differential pressure (P1-P2) to be raised to the set pressure.


With the same mechanism, the pilot valve responds to fluctuation of the inlet pressure or the outlet pressure, thereby automatically adjusting the main valve opening appropriately and maintaining the differential pressure (P1-P2) at the set pressure.


The set pressure can be finely adjusted with the coil spring of the pilot valve.


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

Operating differential pressure
0.1MPa or more

Differential Pressure Regulator Valve

Example application

Differential Pressure Regulator Valve

Selection chart/Outer dimensions

Please refer to Common specifications & Outer dimensions.

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