Caleffi HIU
Caleffi HIU Diaphragm Safety Relief Valve 1 x 1 1/4 6 Bar 531660
Caleffi HIU diaphragm safety relief valve with 1 in x 1 1/4 in connections and a 6 bar designation.
£88.24
£73.53 ex. VAT · VAT at 20%
Same-day dispatch
Ordered by 4pm Mon–Fri, 10:30am Sat.
30-day returns
Unused, in original packaging.
What it is
The Caleffi HIU diaphragm safety relief valve is a pressure-relief component used to vent excess pressure from a heating or hot water circuit. The diaphragm design separates the valve mechanism from the system water, which keeps the moving parts clear of debris and scale carried in the circuit. It is listed under Caleffi HIU products and is designated at 6 bar with 1 in x 1 1/4 in connections.
Before you order
- Confirm the 6 bar designation matches the pressure rating required by the appliance or circuit it protects.
- Check the 1 in x 1 1/4 in connection sizes against the existing pipework and any adaptors already fitted.
- Compare the markings on the valve being replaced with the designation given here, as relief valves are supplied in several pressure settings.
- Check compatibility with the Caleffi HIU equipment the valve is being fitted to.
No specification data held for this part.
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| CALEFFI HIU PRODUCTS | — | — | — |
Documents & drawings
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No documents held for this part. The technical team will source them from the manufacturer — usually the same working day.
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