Safety valves for heating systems

  • Standardized heating safety valve
  • Suitable for steam generators up to 1 bar overpressure
  • Suitable for water heating systems up to 120 °C
  • Complies with DIN EN ISO 4126-1, DIN 4751 Part 2 and TRD 721 standards

Approvals

LESER S&R safety valves are designed, marked, produced and approved according to the requirements of the following regulations:

  • LESER CE Approvel

Valve Types

Type 424

Safety valves for steam boilers up to 1 bar g

DN 25 - DN 150 (1" - 6")

Type 440

Flanged safety valves for heating plants up to 120 °C acc. to DIN 4751 part 2

DN 20 - DN 150 (3/4" - 6")

Type 460

Threaded safety valves for heating plants up to 120 °C acc. to DIN 4751 part 2

DN 15 - DN 20 (3/4" - 1")

Technical data S&R

Nominal Diameter at Inlet
DN 20 - DN 150 | 3/4" - 6"
Actual Orifice Diameter d₀
13 mm - 125 mm | 0.512 in - 4.921 in
Actual Orifice Area A₀
133 mm² - 12.272 mm² | 0.206 in² - 19.022 in²
Pressure
0.5 bar - 10 bar | 7.3 psig - 580 psig
Temperature (in accordance with DIN EN)
-45 °C to 150 °C | -49 °F to 302 °F
Body Material
0.6025, 0.7043, 1.0619, 430F | Cast steel, Ductile Gr. 60-40-18, SA 216 WCB, 1.4104
Valve Connection
Flange in accordance with DIN, threads
Bellows Material (optional)
Elastomer
Load Type
Spring-loaded
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