FAQ for control valves

Yes. AVK offers control valves prepared for SCADA integration, such as the pressure reducing control valve with electrical actuator. 

Series 859 can be ordered with anti-cavitation trim, or you can install valves in series. An anti-cavitation trim “moves” the cavitation to where it does not cause damage. 

A correctly sized AVK control valve typically results in a pressure loss of approximately 0.3 bar. 

The parabolic plug ensures highly accurate regulation and stability at low flows. It also reduces noise and vibration, supporting improved network performance. 

Adjusting the regulating speed helps eliminate fluctuations in sensitive networks and prevent water hammer and surge problems. Adjustments are easily made on the distribution block using standard tools.

You can adjust the opening or closing speed directly on the distribution block using standard tools. 

Yes. For differential pressures above the allowed level (per cavitation guidelines), AVK recommends using anti cavitation trim or installing valves in series. 

Yes. AVK constant flow valves maintain flow with high accuracy regardless of pressure changes in the network. Common applications include reservoir inlets and outlet flows into distribution networks.

To determine the correct valve type and size, information about maximum and minimum flow, continuous flow, maximum and minimum inlet pressure, required pressure and pipe size is needed.

Available ranges: 0.6–6 bar, 5–11 bar and 10–16 bar. Springs can be changed on site without removing the valve. Furthermore, AVK offers valves dedicated for low pressure applications in the range of 0.1-1 bar.

Available ranges: 1.5–6 bar, 5–10 bar and 10–16 bar. Springs can be changed on site without removing the valve. Furthermore, AVK offers valves dedicated for low pressure applications in the range of 0.3-1.5 bar.

No. To ensure precise regulation, AVK uses dedicated springs for narrower pressure ranges that match the intended operating window. 

Yes. Thanks to the modular pilot system, AVK control valves are easy to alter for other or multiple applications without replacing the valve. A leakage test is recommended after modifications. 

Yes. A PRV controller can be easily installed directly on AVK series 859 pressure reducing valves. Soon we will release our new Equilo System with PRV controller.

Yes. Series 859 pressure reducing or pressure sustaining valves can easily be upgraded with solenoid override. 

Contact Team leader and product manager, Martin Børsting by following the link below.

Standard tools such as a wrench/spanner and screwdriver are sufficient for normal operations and maintenance. 

Maintenance frequency depends on the characteristics of the distribution network. A first inspection is recommended after about one month, or sooner if the valve is not in full control. In some networks, valves can operate for years without requiring service. 

• Flush and clean the filter
• Bleed air from the top air valve on the distribution block
• Ensure the orifice between filter and distribution block is clean
• Inspect the pilot handle spring for corrosion 

• Remove bonnet, clean internal surfaces and channels
• Check the condition of the inside spring
• Inspect diaphragm for fractures or damage
• Check plug and seat for markings and general condition. The valve must close drip tight.