S&R
S&R Safety Valve from LESER

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
Valvestar from LESER

VALVESTAR®

Sizing of your safety valve.

VALVESTAR®
Download Area of LESER

Downloads

In our comprehensive download area you will find all necessary documents and detailed information on safety valves you need.

Download area
Contact LESER Teaser

Contact LESER

Send a message to LESER

Contact
	LESER_Contact_worldwide_Teaser

Contact finder

Your local contact person will support you with all questions concerning the safety valve.

Find your local contact