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product page - LESER Type 440 S & R pressure relief valves

S & R

TYPE 440

LESER Type 440 S & R pressure relief valves


Heating & Air Conditioning >


Type 440 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 440

Nominal Diameter at Inlet

DN 20 - DN 150 | 3/4" - 6"

Actual Orifice Diameter d₀

18 - 125 mm | 0.71 - 4.92 in

Actual Orifice Area A₀

133 mm² - 12.272 mm² | 0.206 in² - 19.022 in²


1 - 10 bar | 14.5 - 145 psig

Flange Rating Inlet

PN 16 | PN 16

Temperature (in accordance with DIN EN)

up to 120 °C | up to 248 °F

Body Material

0.6025, (0.7043, 1.0619) | Cast steel, Ductile Gr. 60-40-18 / SA 216 WCB

Valve Connection

Flange acc. to DIN

Bellows Material (optional)


Load Type



TRD 721, PED/ DIN EN ISO 4126-1, PED/ AD 2000-Merkblatt A2, 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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