Globe valve 90-21 series

pressure-reducing

Cla-Val 90-21 Pressure Reducing Valves are indispensable in any fire protection system. Available in globe (90G-21) and angle patterns (90A-21), our diaphragm actuated design is proven to be highly reliable and easy to maintain. Our 90-21 valves feature a full range of adjustments and variety of material options. Cla-Val 90G-21 (globe) and 90A-21 (angle) Pressure Reducing Valves automatically reduce a higher inlet pressure to a steady lower outlet pressure regardless of changing flow rate and/or varying inlet pressure. The valves pilot control system is very sensitive to slight downstream pressure fluctuations, and will automatically modulate to maintain the desired pressure setting. The downstream pressure can be set over a wide range by turning the adjustment screw clockwise (increase pressure) or counter clockwise (decrease pressure) on the CRD pilot control. The adjustment screw is protected by a screw-on cover, which can be sealed to discourage tampering. Underwriters Laboratories requires the installation of pressure gauges upstream and downstream of the Pressure Reducing Valve. A relief valve of not less than 1/2 inch in size must also be installed on the downstream side of the pressure control valve. Adequate drainage for the relief valve discharge must be provided. The valve may be installed in either vertical or horizontal positions.