Downloads and FAQ for control valves

Downloads

FAQ

What data should I provide to select the right type and size of valve?
Maximum and minimum flow, continuous flow, maximum and minimum inlet pressure, wanted outlet pressure, pipe size. 
Link to our online calculation tool

What is the typical pressure loss across the valve?
Typically 0.3 bar for a correctly sized valve.

What is the advantage of a parabolic plug design?
A parabolic plug design gives you a more accurate regulation and stability at low flows.

What is the advantage of adjustment of regulation speed?
You can eliminate fluctuations within sensitive networks, and avoid water hammer and surge problems. You also get full control on level control valves.

What do I do if my valve opens or closes too fast/slowly?
You adjust the opening or closing speed on the distribution block, using standard tools.

Can I use control valves for high differential pressure?
Yes. If the differential pressure is higher than allowed, according to the cavitation chart use anti-cavitation plug or valves in series. Link to technical appendix about control valves.

What can be done if there is a risk of cavitation?
S859 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. 

Is it possible to modify the control valve to fit another application?
Yes, an AVK control valve is very easy to modify thanks to the modular pilot system, which is easily altered to fit other or multiple applications without replacing the valve. And you don’t need to pressure test it after modification, but a leakage test is recommended.
See video about how to change a pressure reducing valve into a pressure sustaining valve
See video about how to change a pressure sustaining valve into a pressure reducing valve

What tools do I need to operate and maintain an AVK control valve?
Just standard tools like a wrench/spanner and a screwdriver.

How frequently should I maintain my control valve?
All depending on your pipe and distribution network. First check after 1 months, or sooner if the valve isn’t in full control, and then take it from there. In some networks the valve can work several years and function perfectly without maintenance.

How do I perform maintenance on an AVK control valve?
Pilot maintenance:

  1. Flush / clean filter
  2. Bleed the main valve, on the air valve on top of the distribution block.
  3. Make sure orifice between filter and distribution block is clean.
  4. Check external spring in pilot handle for corrosion.

Optional extras include a filter flush valve which enables cleaning of the filter without doing any other works on the pilot.

Main valve maintenance: 
  1. Remove the bonnet, and check that the inside of the bonnet and the holes to the distribution block are clean and not blocked.
  2. Check that the inside spring is in good condition and clean.
  3. Check that there are no fracture or damage on the diaphragm.
  4. Check the plug and the seat for markings and check general condition. It should be able to close drip tight!

You can find detailed video about pilot maintenance and main valve maintenance here.

Which pressure ranges are available for pressure reducing applications?
0.6-6 bar - 5-11 bar - 10-16 bar.
It is possible to change the spring on site, without removing the valve. Furthermore, AVK offers valves dedicated for low pressure reducing applications in the range of 0.1-1 bar.

Which pressure ranges are available for pressure sustaining applications?
1,5-6 bar - 5-10 bar - 10-16 bar.
It is possible to change the spring on site, without removing the valve. Furthermore, AVK offers valves dedicated for low pressure sustaining applications in the range of 0.3-1,5 bar.

Is it possible to order an AVK control valve with a pressure range from 0 to 16 bar?
No, such a valve would not live up to our high standards of precise and accurate regulation. Therefore, we deliver control valves with dedicated springs for a smaller pressure range to obtain the best possible result.

Can an AVK control valve maintain a constant flow?
With an AVK constant flow valve you can control the flow with high accuracy regardless of pressure changes within the network. This is typically used in applications such as reservoir inlets or outlet flows into distribution networks. Please find a short video presentation of the AVK constant flow valve here.

Is it possible to install a PRV controller on an AVK series 859 pressure reducing valve?
You can easily install a PRV controller on AVK series 859 pressure reducing valves. Please find the short video "How to install a Regulo PRV controller on your AVK series 859 PRV" here.

Is it possible to install solenoid override on a standard pressure reducing or pressure sustaining valve?
A standard AVK series 859 pressure reducing valve can easily be modified to a pressure reducing valve with solenoid override. The same applies to a standard AVK series 859 pressure sustaining valve which can easily be modified to a pressure sustaining valve with solenoid override. Please find instruction-videos here.

ANIMATION

Control valves

Features and function of our control valves series 859

Download

Control valves

Learn how control valves can help reduce water losses and contribute to efficient water supply management.

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