The unique pilot valve operation exhibits excellent constant flow characteristics.

Variable constant flow rate regulating function may be added for flow rate control over a wide range, allowing effective use and stable supply of water (optional).

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.

1.

An orifice is provided at the inlet side of the valve, and differential pressure (P1-P1') that arises between the front and the rear of the orifice due to the flow rate fluctuation drives the pilot valve, thereby opening and closing the main valve and maintaining the set flow rate.

2.

The pilot valve operates in the same manner as in the Constant Pressure Valve, with intermediate pressure Pe being formed by the actions of pilot A valve and pilot B valve. This intermediate pressure is transmitted to the top of the main valve for automatic adjustment of the main valve opening.

3.

The set flow rate can be finely adjusted with the coil spring of the pilot valve. If flow rate control over a wide range is required, a butterfly valve or other flow rate adjustment valve (optional) may be installed in place of the fixed orifice.

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

Operating differential pressure
0.1MPa or more

Please refer to Common specifications & Outer dimensions.