Watts SVW 6 1" apsauginis vožtuvas
- Opening pressure: 6 bar (fixed)
- Inlet connection: 1" internal thread
- Certification: TÜV per DIN EN 1268
- Typical boiler output: up to ~250 kW (per DIN 4751 table)
Where Watts SVW 6 1" is used
Applied in higher-output closed heating systems — central boiler rooms of multi-family buildings, commercial premises, industrial buildings where combined generator output exceeds 100 kW. 1" inlet connects directly to trunk pipework without adapters; enlarged 1 1/4" outlet ensures discharge capacity during sudden overpressure events.
Technical specifications
| Parameter | Value |
|---|---|
| Code | 10004749 |
| Series | Watts SVW |
| Type | Diaphragm safety relief valve (closed systems) |
| Opening pressure | 6 bar |
| Inlet thread | 1" (internal) |
| Outlet thread | 1 1/4" (internal) |
| Max working temperature | 120 °C |
| Media | Heating system water, glycol solution up to 30 % |
| Body material | DZR brass |
| Diaphragm | EPDM |
| Certification | TÜV, DIN EN 1268, PED 2014/68/EU |
| Installation position | Vertical, spring upwards |
Sizing by boiler output
Watts SVW 6 1" per DIN 4751 typically covers up to ~250 kW generator output (with 6 bar opening pressure). Exact sizing is done by the designer using Watts catalogue capacity tables, factoring generator type (gas / solid fuel / heat pump), system layout and local regulations.
When to choose SVW 6 1" over SVW 6 3/4"
- Multi-family central boiler rooms with combined heating load up to ~250 kW
- Commercial buildings with mid-capacity heating systems
- Industrial process circuits (process heating up to 6 bar)
- When the trunk pipework is 1" — reduces fitting count
B2B delivery and logistics via Amegata.lt
- 24-hour delivery across the EU (from our warehouse in Vilnius)
- Competitive B2B pricing — often below market average
- 30-day payment terms for companies (per contract)
- Free technical consultation for valve sizing
Official Watts catalogue: wattswater.eu
Frequently asked questions
When is 1" size required and when is 3/4" enough?
The decision depends on generator output, not pipework size. Rule of thumb: up to ~100 kW — 3/4" (SVW 6 3/4"), 100-250 kW — 1" (SVW 6 1"), above 250 kW — larger versions or parallel safety valve groups.
Can several SVW be piped in parallel?
Yes. In high-output systems (>250 kW) TÜV allows parallel installation — combined nominal discharge capacity must not be less than that required by the generator output.
What is the difference between SVW and Watts SVE?
SVW — safety valve for closed heating systems (closed loop with expansion vessel). SVE — safety valve for domestic hot water storage cylinders (DHW) — with different intermediate characteristics and potable-water certifications.
Is inlet / outlet isolation (shut-off) required?
No. EN 12828 and DIN 4751 prohibit any shut-off device (ball valve, filter, check valve) between the boiler and the safety valve. The connection must be direct and non-blockable.
