Electronic Rate of Flow Valve - 340-07 & 3640-07 | Cla-Val

Cla-Val 340-07 / 3640-07 Electronic Flow Control Valve

The Cla-Val 340-07 / 3640-07 is a pilot-operated flow control valve for water distribution networks. It limits flow to a preset maximum value, independent of upstream pressure fluctuations, within a 4:1 control ratio.

Operating Principle

The system uses a precision orifice plate to generate differential pressure and an electronic pilot (CDHS-34) for remote setpoint adjustment. Setpoint can be provided via SCADA using 4–20 mA, dry contacts (CW/CCW), or Modbus RTU.

Technical Data

• Connection: flanged
• Standard: ANSI
• Pressure class: 150 / 300 lbs
• Body materials: brass, ASTM A216 WCB, ductile iron
• Pilot CDHS-34: 12–24 VDC
• Pilot range: 70–480 inH₂O differential
• Pilot water temperature: up to 180 °F
• Pilot materials: bronze ASTM B62, stainless steel 303 trim, Buna-N elastomers
• Actuator enclosure: IP68 submersible

Failure Mode

On power loss, the CDHS-34 holds last command and hydraulic pilot operation continues to control the main valve. On setpoint signal loss, position can be programmed to 4 mA, last, or 20 mA.

Applications

• flow limitation in network zones
• remote flow control in aqueducts
• downstream network over-flow protection
• retrofit for manual Cla-Val 40 Series rate-of-flow valves
• installations where pit entry for setpoint adjustment is undesirable

FAQ

Is a flowmeter required?
Regulation is based on orifice plate and differential pressure, not necessarily on an external flowmeter.

Is it an on-off valve?
No. It is a flow limiting/regulating valve with electronically adjustable setpoint.