Electronic Pressure Control Valve with VC-22D Controller - 131-66 & 631-66 | Cla-Val

Cla-Val 131-66 / 631-66 with VC-22D

The Cla-Val 131-66 and 631-66 are hydraulically actuated, pilot-operated diaphragm valves designed for electronic pressure control in water distribution systems. The VC-22D controller sends commands to solenoid pilots, which modulate the pressure in the cover chamber, causing the main valve to open or close hydraulically.

Operating Principle

The VC-22D compares the pressure signal from a sensor to the set point and issues pulsed electrical signals to the solenoid pilots. Main valve modulation is achieved hydraulically; there is no direct electric actuator on the main valve.

Suitable for:

• downstream pressure stabilization
• remote pressure control
• variable set points via automation systems
• water networks with fluctuating demand
• pressure zones and DMA applications

Technical Selection

The 131-66 series uses a full-port main valve; the 631-66 is a reduced-port design. Selection depends on required flow, available differential pressure, flow velocity, and control stability requirements.

Construction

Available options include:

• flanged connections
• ANSI Class 150 or 300
• body materials: ductile iron, ASTM A216 WCB, or bronze
• suitable for potable water and distribution networks

Operational Considerations

Proper operation requires pilot circuit filter maintenance, sufficient differential pressure, and correct pressure sensor placement. In systems with rapid flow changes, controller tuning and flow restrictor settings directly affect loop stability.

FAQ

Is this an electrically actuated valve?

Not fully. Main actuation is hydraulic; the electrical signal only operates the pilots.

When is the 631-66 selected?

When the required flow is lower than what corresponds to a full-port valve of the same nominal size.