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product page - LESER S & R pressure relief valves for heating and air conditioning

S & R

Pressure relief valves for heating systems

LESER S & R pressure relief valves for heating and air conditioning
  • Standardised heating pressure relief 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 standard

Industries

Approvals

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

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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 2DN 15 - DN 20 (3/4" - 1")

Technical Data for 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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Downloads

Access all the necessary documents and detailed information for pressure relief valves in our download area.

LESER S & R product catalogue. heating and air conditioning
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