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Control valves
Control Valves for Water Treatment Plants
Control valves on a water treatment plant direct flow through service, backwash, regeneration and rinse cycles on media and softener vessels, and throttle concentrate and permeate on RO skids. They are specified by line size, pressure rating, actuation type and the cycle sequence the vessel requires.
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Answer first
What Control Valves Are, and How They Are Specified
Control valves on a water treatment plant direct flow through service, backwash, regeneration and rinse cycles on media and softener vessels, and throttle concentrate and permeate on RO skids. They are specified by line size, pressure rating, actuation type and the cycle sequence the vessel requires.
Two quite different valve duties share the name. Multiport valves on FRP vessels sequence a media bed through service, backwash, regeneration and rinse; throttling valves on an RO skid set concentrate flow and therefore recovery.
The second of those is the one most often adjusted without appreciating its effect. The concentrate valve is what sets recovery on most small plants, and closing it to raise permeate output raises recovery at the same time — which can push the concentrate past its scaling limit.
Specification
Valve types and duty
| Valve type | Duty | Notes |
|---|---|---|
| Multiport, manual | Media filter and softener cycling | Operator sequences the cycle |
| Multiport, automatic | Timed or metered regeneration | Preferred where regeneration is unattended |
| Concentrate throttling valve | Sets recovery on the RO array | Adjusting it changes recovery, not just flow |
| Permeate isolation | Isolates product line | Also used for flushing arrangements |
| Feed inlet valve | Plant isolation | Sized to line, rated to system pressure |
| Actuation | Manual, electric, pneumatic | Follows the control philosophy |
Multiport, manual
- Duty
- Media filter and softener cycling
- Notes
- Operator sequences the cycle
Multiport, automatic
- Duty
- Timed or metered regeneration
- Notes
- Preferred where regeneration is unattended
Concentrate throttling valve
- Duty
- Sets recovery on the RO array
- Notes
- Adjusting it changes recovery, not just flow
Permeate isolation
- Duty
- Isolates product line
- Notes
- Also used for flushing arrangements
Feed inlet valve
- Duty
- Plant isolation
- Notes
- Sized to line, rated to system pressure
Actuation
- Duty
- Manual, electric, pneumatic
- Notes
- Follows the control philosophy
Typical duty types. Sizes, ratings and actuation follow the datasheet of the valve quoted.
Selection guidance
Do not chase permeate flow with the concentrate valve
When permeate output falls, the quickest apparent fix is to close the concentrate valve, which raises pressure and restores flow. What it also does is raise recovery, concentrating hardness, silica and sulphate further in the reject.
If the flow loss was caused by early scaling, this accelerates it. Check normalised flow, differential pressure and feed conditions before adjusting the concentrate valve, and treat a permanent change to its setting as a change to the plant design rather than an operational tweak.
Application mapping
Where Control Valves Are Used
Softener regeneration
- Typical requirement
- Unattended cycling
- Indicated configuration
- Automatic multiport valve, metered where usage varies
Media filter backwash
- Typical requirement
- Scheduled backwash and rinse
- Indicated configuration
- Multiport valve sized to backwash flow, not service flow
RO recovery setting
- Typical requirement
- Recovery held at design
- Indicated configuration
- Concentrate throttling valve set against measured permeate and concentrate flow
Commercial terms
How This Category Is Quoted
Water treatment does not have a list price, and any supplier quoting one before seeing a feed analysis is quoting a different plant from the one you need.
Pricing basis
On request, and capacity-dependent. Plant pricing moves with capacity, feed water analysis and the recovery target; membranes, cartridges and resins are quoted per element, per lot or per litre of media.
Order quantity
From a single replacement element or a case of cartridges through to full plant scope. Consumable lines are quoted per box or per lot, and the lot size is stated on the quotation.
Lead time
Confirmed per line item at quotation stage. Stocked consumable lines and made-to-order plant differ substantially, so a single blanket lead time for the category would be misleading — the quotation carries the figure for each line.
Invoicing
GST invoice against company or institutional purchase order. Proforma issued where advance payment or internal approval requires it.
Delivery coverage
Despatch from Delhi NCR across India, including plant, project and institutional sites. Delivery city and site access are asked for at enquiry because both affect despatch mode.
Documentation
Technical datasheet for the item quoted, and a test certificate where the principal supplies one with that product. Tender and institutional documentation formats are prepared on request — send the format with the enquiry so the quotation is issued in a form you can submit without rework.
Request for quotation
Request a Quote — Control Valves
Fields marked with an asterisk are required. The technical fields are what usually decide whether you get a quotation on the first pass or three emails of clarification.
Frequently asked
Control Valves — Common Questions
What does the concentrate valve on an RO plant do?
It throttles the concentrate line, which sets the back pressure on the array and therefore the split between permeate and concentrate — in other words, the recovery.
Closing it raises recovery as well as pressure. On a plant near its scaling limit that can cause the problem it appears to solve.
Should a softener have a manual or automatic control valve?
Automatic wherever regeneration would otherwise depend on somebody remembering. Metered automatic valves regenerate on volume treated, which suits variable demand better than a timer.
Manual valves are adequate on small, closely supervised installations where the cycle is part of a routine.
How is a multiport valve sized?
On backwash flow rather than service flow, since backwash is the higher-flow condition and an undersized valve will not fluidise the bed properly.
Vessel diameter and media type set the backwash rate, so the valve is selected once those are fixed.
Related Products and Categories
Specified alongside control valves, and the category this page sits in.
FRP vessels these valves serveFlow meters for setting recoveryPressure gaugesBack to RO Components and Accessories
- Delhi NCR base with pan-India supply, including plant and project sites.