# Safety Relief Valve CALEFFI 3/4" 3.5 bar (model 311535)

**URL:** https://aio.lv/en/product--caleffi-311535--11836323
**Data updated:** 2026-03-09 14:49 (EET)
**Category:** Home Appliance Accessories
**Manufacturer:** CALEFFI
**Manufacturer code:** 311535
**EAN:** 8016615003659
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 18.49 €
**Prices and availability valid until:** 2026-07-19 23:59
**Price without VAT (21%):** 15.28 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--caleffi-311535--11836323

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 15.07.2026 | free |
| Pickup points | 20.07.2026 | 1.99 EUR |
| Courier delivery to door | 20.07.2026 | 4.99 EUR |

## Summary description

Safety relief valve CALEFFI 3/4" 3.5 bar (311535) is a pressure relief device designed to protect heating and plumbing systems from overpressure. With a 3/4" connection and factory-set 3.5 bar opening pressure, it releases excess pressure to prevent damage. Suitable for residential and light commercial boilers, hot water systems and closed circuits where overpressure protection is required.

## Long description

The CALEFFI safety relief valve 3/4" 3.5 bar is a pressure relief device for heating and domestic hot water systems. Designed to open at a factory-set pressure of 3.5 bar, the valve releases excess pressure from closed circuits to protect boilers, tanks and piping from overpressure. With a 3/4" threaded connection, the valve is compact and intended for installation on residential and light commercial systems where reliable overpressure protection is required.
Advantages
This safety relief valve provides a precise, factory-set opening pressure for consistent operation and reduces the risk of manual adjustment errors. Its 3/4" connection allows compatibility with common plumbing fittings and installers benefit from a straightforward mechanical design that requires no external power. Built for corrosion-resistant service in typical heating and hot water environments, the valve contributes to system safety by discharging excess fluid when set pressure is reached.
Suitable for
Domestic and small commercial boilers and pressurized hot water cylinders
Closed-loop heating circuits, including radiators and underfloor systems
Domestic hot water systems and indirect water heaters
Hydraulic circuits and pressure vessels requiring 3.5 bar overpressure protection
Key specifications
Connection size: 3/4" threaded inlet
Opening (set) pressure: 3.5 bar
Function: automatic pressure relief for closed systems
Mounting orientation: vertical or as specified by installer manual
Typical materials: corrosion-resistant metal components suitable for heating fluids
How to use
Install the valve on the system at the designated safety port or discharge line following local regulations and installation practices. The valve must be fitted by a qualified technician using appropriate sealing and tightening methods for the 3/4" threaded connection. Once installed, the valve remains closed during normal operation and opens automatically when system pressure exceeds 3.5 bar, discharging the excess fluid to a safe drain or designated container. Regular visual inspection and system testing are recommended to confirm correct operation and detect leaks or deposits that could affect performance.
Usage recommendations
Locate the discharge outlet where released fluid can be safely routed; avoid routing discharge to areas that may be damaged by hot water. Check compatibility with the system fluid and follow applicable local codes for safety valve installation and drainage. Periodic inspection and maintenance by qualified personnel will help ensure reliable operation.

## FAQ

### How much does the Safety Relief Valve CALEFFI 3/4" 3.5 bar 311535 cost, and is it available for purchase?

The price is 18.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 7 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 15.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All CALEFFI products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized CALEFFI service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/11836323/67235988_large.webp