Hydraulic Rate of Flow Control Valve - 40-01 & 640-01 | Cla-Val

Cla-Val 40-01 / 640-01 – Hydraulic Flow Control Valve

The Cla-Val 40-01 / 640-01 is designed to hydraulically limit water flow to a preset maximum, independent of line pressure fluctuations. This is a pilot-operated, diaphragm-actuated valve. The pilot receives a differential pressure signal from an orifice plate installed downstream and modulates the main valve position accordingly.

Typical Applications

• Potable water distribution and supply networks
• Flow control for pressure filter systems
• Downstream network protection against excessive flow
• Transfer lines with variable pressure conditions
• Industrial process water circuits

Technical Operation

Flow setpoint is adjusted via the pilot screw. The X52E/X52A orifice plate generates a measurable differential pressure, used as the hydraulic control signal. For stable control, the orifice plate is typically installed 1–5 pipe diameters downstream of the valve.

Construction and Options

• Body: ductile iron, ASTM A216 WCB, or brass
• Connections: ANSI flanged, class 150 and 300 lbs available
• Sizes: 40–900 mm, depending on material and version
• Disc/diaphragm: Buna-N
• Stem, spring, trim: stainless steel
• Water temperature: up to 180°F / approx. 82°C

Optional Equipment

Available options include pilot line strainers, isolation valves, check feature for reverse flow prevention, pressure gauge, opening/closing speed adjustment, and valve position indicator.

FAQ

When is it selected? Applied where mechanical/hydraulic flow limitation is required without electric actuators.

What is required for correct selection? Pipe diameter, flow setpoint, pressure, body material, flange class, trim, and orifice plate bore.