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product group - type 424 S & R LESER pressure relief valves. heating and air conditioning

S & R

TYPE 424 

type S & R LESER pressure relief valves. heating and air conditioning



Type 424 LESER S&R pressure relief valves are designed, marked, produced and approved according to the requirements of the following regulations:

ce-mark logo
EAC logo

Technical Specifications for Type 424

Nominal Diameter at Inlet

DN 25 - DN 150 | 1" - 6"

Actual Orifice Diameter d₀

23 - 125 mm | 0.98 - 4.92 in

Actual Orifice Area A₀

416 - 12272 mm² | 0.65 - 19 in²


0.5 - 1 bar | 7.2 - 14.5 psig

Flange Rating Inlet

PN 16 | PN16

Temperature (in accordance with DIN EN)

up to 120 °C | up to 248 °F

Body Material

0.6025, (1.6019) | Cast steel, (SA 216 WCB)

Valve Connection

Flange acc. to DIN EN 1092-1

Bellows Material (optional)


Load Type



PED/ DIN EN ISO 4126-1, PED/ AD 2000-Merkblatt A2, AQSIQ, EAC



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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