The loop is already
under pressure.
Inhibitor and biocide dosing straight into a pressurised heat network. A MAC dosing valve doses against the loop pressure, so treatment stops being a pot, a visit and a slug of chemical nobody metered.
The case for change
Why a dosing pot is a poor way to treat a heat network
A side-stream pot needs an engineer on site, an isolation and a slug of chemical that nobody measures. Between visits the inhibitor reserve drifts, diluted by every litre of make-up, and you learn where it landed when the next sample comes back. On a network serving hundreds of dwellings, that gap is where the corrosion debris comes from.
Pulsation errors costing you compliance
Stroke-based pumps create pulsation at low flows, causing dosing inaccuracy, downstream mixing problems, and dose logs that cannot be defended in an audit.
Tubing failures and unplanned downtime
Peristaltic tubing splits under chemical exposure. Every failure means a reactive call-out, replacement parts, and a window where dosing has stopped entirely.
High maintenance across multiple failure points
Check valves, diaphragms, tubing, and motors all need regular servicing. Each failure point is a separate maintenance task and a separate cost line.
Accuracy drift as components wear
Pump accuracy degrades as internals wear. The further from original design point, the worse the drift, and the harder it is to keep dose logs within spec.
Engineering architecture
Four precision advantages inside every MAC Liquid Bullet Valve
Hover each capability to see the system respond in real time.
Dual D-Flex Diaphragm
Media contacts only the diaphragm faces and valve body. No sliding seals, no o-ring rub, no tubing in the flow path. Chemical isolation by design.
Balanced Poppet
Upstream pressure variation is equalised at the seat. Dosing volume per pulse stays consistent regardless of supply fluctuations, over the full life of the valve.
High-Speed Solenoid Actuation
On/off switching, pulse-width modulation, or proportional control. Fast cycling creates near-continuous micro-dosing from a valve-sized footprint.
Manifold Integration
A single block serves multiple dosing channels from one connection point, replacing the wiring, tubing, and floor space of individual pump assemblies.
Smart dosing integration
How AQUAIOT connects MAC valves to your water system
From sensor input to auditable dose log, in four steps.
Monitor
AQUAIOT sensors measure flow, conductivity, and water quality in real time. Data streams to the edge controller continuously.
Decide
Cloud logic and local edge rules calculate the dosing requirement against set-points, flow conditions, and time windows.
Dose
The MAC LBV fires precise solenoid pulses. Pulse width, frequency, and duration are all configurable from the AQUAIOT dashboard.
Prove
Every dose event is logged with timestamp, volume and sensor context, so the treatment history lines up with your sample results instead of living on a job sheet.
Integration and control
Built for your existing infrastructure
SCADA and BMS
MODBUS RS485 and API connections. Direct integration with existing control systems without replacing your architecture.
Closed-loop dosing
Flow, conductivity, or quality sensor feedback adjusts dosing in real time. No manual trim, no operator intervention.
Compliance logging
Timestamped inhibitor and biocide dose records. Exportable evidence to sit alongside BSRIA BG 50-aligned closed system sampling and your network operating records.
4G and LoRaWAN
Secure cellular telemetry. Encrypted payloads, over-the-air configuration, remote firmware updates.
PWM and proportional
On/off pulse, pulse-width modulation, or 0-10V / 4-20mA proportional control from one valve platform.
Cloud dashboard
Trendlines, alarms, analytics, role-based access, and data export from the AQUAIOT platform.
Heat network duty
What a heat network doses
Controlled inhibitor and biocide dosing into a pressurised loop. Part of the full chemical dosing valve range.
Heat network dosing
Inhibitor dosed straight into the pressurised loop and, where it matters, in proportion to make-up so top-up does not dilute the reserve unnoticed.
Biocide on the same manifold at its own rate, with every dose timestamped so the treatment history reads alongside the sample results.
Heat networksCooling towers
Steady biocide, scale and corrosion dosing that supports your Legionella regime.
Cooling waterBoiler feedwater
Steady oxygen scavenger and phosphate dosing into feedwater at pressure.
Steam raisingWater treatment plants
Flow-proportional coagulant, pH and chlorine dosing for stable residuals.
Potable and processTechnical overview
BV214 and BV221: full technical reference
| Parameter | BV214 | BV221 |
|---|---|---|
| Body size | 14mm | 21mm |
| Flow range | Micro to low L/min | Low to mid L/min |
| Max pressure | ~8 bar (app. dep.) | ~10 bar (app. dep.) |
| Actuation | Solenoid: on/off, PWM | Solenoid: on/off, PWM |
| Elastomers | PTFE, FKM, EPDM | PTFE, FKM, EPDM |
| Temp. range | 0 to 80°C | 0 to 80°C |
| Manifold | Single / multi-channel | Single / multi-channel |
| Connection | G-thread / custom | G-thread / custom |
| Media | Water, fertilisers, detergents, reagents, gases | |
| Control signal | On/off, PWM, proportional (0-10V / 4-20mA) | |
| ATEX variants | Available, contact us with zone classification | |
Exact specifications depend on body, orifice, and elastomer selection. Contact us for application-specific sizing and ATEX requirements.
Why choose AQUAIOT
Factory-authorised. Engineering-supplied. UK-stocked.
Authorised MAC Valves UK and Ireland distributor
As part of PSI Technologies, AQUAIOT holds factory-backed authorisation. We specify, stock, and support MAC dosing valves across the UK and Ireland.
Our engineers configure every build
Bespoke valve selection for unusual media, pressure, or manifold requirements. P&ID review included.
UK stock and rapid supply
Standard configurations held in UK inventory for rapid dispatch. No lengthy lead times on core SKUs.
End-to-end delivery
Hardware specification, IoT integration, cloud dashboard, commissioning, and ongoing support all from one team.
Open and interoperable
SCADA, BMS, CAFM, and AQUAIOT ecosystem integration via MODBUS, RS485, and API. No lock-in.
AQUAIOT operates as part of PSI Technologies, making us the exclusive MAC Valves partner for liquid dosing applications in the UK and Ireland. Every solution combines factory-authorised valve hardware with AQUAIOT IoT integration, cloud dashboards, and our own engineering team on every project.
- Factory-authorised MAC Valves supply and specification
- AQUAIOT IoT integration included as standard
- UK-held stock for standard configurations
- Engineering team covers design, install, and commissioning
- Cloud monitoring, audit logging, and SCADA integration
- Post-installation support and remote diagnostics
Common questions
District heating dosing valve questions
Get started
Discuss your heat network dosing
Tell us your inhibitor and biocide programme, your loop pressure, make-up arrangement and sampling regime. Our engineers will size the MAC valve and integrate the telemetry.
Prefer to call? 02392 233611 · Full contact page
District heating dosing. Inhibitor dosed into the live loop, no pot and no visit, from AQUAIOT.
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