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The Caleffi Series 309 Pressure & Temperature Relief Valve is a safety-critical mechanical fail-safe designed exclusively for unvented domestic hot water storage cylinders. Its primary function is to protect the structural integrity of the hot water tank by preventing the stored water from reaching a critical boiling state. If system safety controls fail and temperature or pressure thresholds are breached, the valve activates automatically, discharging a controlled volume of water to lower system energy and safely restore stable operating conditions.
- Temperature setting: 90°C
- Pressure Setting: 10 Bar
- Brand
- Caleffi
- Category
- Pressure & Temperature Relief Valve
- Product Code
- 061-475-0703
- Main Material
- Dzr Brass
- Main Colour
- Gold
- Box Quantity
- 1
- Weight
- 255 g
- Width
- 55 mm
- Height
- 190 mm
- Diameter
- 30 mm
- GTIN
- 0708747450699
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Our delivery policy
We will deliver goods as soon as we can. An estimated delivery date will be provided on the checkout pages. For stock items, this may be as soon as the next day, for out-of-stock items it may take a few days longer.
Local deliveries within 40 miles of our Dorchester branch. We deliver via courier to other areas of the UK excluding the channel islands.
See our 'Terms of Sale' for more information on our delivery policy. -
Our returns policy
Please see our 'Terms of Sale' for more information regarding our Returns Policy.
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