# Four-way straight valve Herz VUA 40 1/2" (model 1 7783 41) — hydraulic balancing and mixing valve

**URL:** https://aio.lv/en/product--herz-1778341--11700139
**Data updated:** 2026-03-08 08:46 (EET)
**Category:** Heating Radiators
**Manufacturer:** Herz
**Manufacturer code:** 1778341
**EAN:** 9004174722905
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 38.99 €
**Prices and availability valid until:** 2026-07-17 23:59
**Price without VAT (21%):** 32.22 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--herz-1778341--11700139

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 09.07.2026 | free |
| Pickup points | 14.07.2026 | 1.99 EUR |
| Courier delivery to door | 14.07.2026 | 4.99 EUR |

## Summary description

Herz VUA 40 is a four-way straight valve (model 1 7783 41) with 1/2" connections designed for hydraulic balancing and mixing in heating and cooling systems. It provides direction control between supply and return circuits and supports temperature regulation and circuit separation in secondary loops. Typical use cases include radiator and underfloor heating installations, boiler bypasses, and system commissioning.

## Long description

Herz VUA 40 1/2" (model 1 7783 41) is a four-way straight valve designed for hydraulic balancing and mixing in heating and cooling systems. The valve connects supply and return circuits with 1/2" threaded connections and enables controlled redirection of flow between primary and secondary loops. It is intended for use where mixing, temperature regulation and circuit separation are required, such as radiator circuits, underfloor heating manifolds, boiler bypass lines and system commissioning tasks.
Advantages
The valve offers compact four-way functionality in a straight-body design that simplifies piping layouts and reduces the need for additional fittings. It supports precise hydraulic balancing and stable mixing behaviour across typical residential and light commercial installations. The construction ensures reliable operation in both heating and cooling modes and allows straightforward integration with existing manifolds and circuits that use 1/2" threaded connections.
Suitable for
Mixing primary and secondary circuits in radiator and underfloor heating systems
Boiler bypass and temperature stabilisation in small to medium installations
Commissioning and balancing of heating/cooling loops
Separation of supply and return lines where controlled flow direction is required
Key specifications
Valve type: four-way straight mixing/balancing valve
Connection size: 1/2" threaded connections
Application: hydraulic balancing, mixing, circuit separation in heating and cooling systems
Suitable media: water-based heat transfer fluids used in HVAC systems
Installation orientation: inline/straight pipe run integration
How to use
Install the Herz four-way straight valve into the pipe run where mixing or circuit separation is required, ensuring compatibility with 1/2" threaded fittings and correct flow direction according to system design. Use the valve to blend return and supply flows or to bypass part of the primary flow into a secondary loop; adjust associated actuators or balancing elements as needed to achieve the desired temperature and flow distribution. During commissioning, verify hydraulic balance and temperature setpoints, and make fine adjustments to ensure stable operation in both heating and cooling modes.
Usage recommendations
For reliable performance, flush the system before installation, check that fluid quality and inhibitor levels meet HVAC guidelines, and ensure thread sealants or tape compatible with system fluids are used. Refer to system design parameters when integrating the valve, and perform hydraulic balancing and temperature verification after installation to confirm correct function.

## FAQ

### How much does the Herz VUA 40 four-way straight valve 1/2" cost, and is it available for purchase?

The price is 38.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 13 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 09.07.2026 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 Herz 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 Herz 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/11700139/67083267_large.webp