Excess pressure valve S3 in line

The S3 model is a relief valve with valve and spring.

A relief valve is not and can not be replace by a safety valve. It uses to maintain the upstream pressure to a setpoint set.


Particularly adapted to compressed air and non-hazardous gas (group 1 and 2); it can also be used with the steam and non-hazardous liquid.

Setting presure :

0,5 bar to 20 barg with different springs

Diameters : DN15 à DN100

Flanges :
DIN PN25 – PN40

On request: Threaded BSP or NPT, BW, SW,…

Leakage classification :
Classe IV (métal / métal)
Classe VI (PTFE+ siège Graphite)

On request, PEEK, NBR, EPDM seal, stellite faced seat…

Material : TRIM Stainless Steel AISI 316L, body Nodular Iron, carbon steel or stainless steel 1.4408.

Special features :
Handwheel regulation, specials gaskets, …

Approvals :
Quality system ISO 9001
Pressure equipment Directive according 97/23/CE
Atex Directive according 94/9/CE (pending to

Several models of relief valves exist (screw-threaded, ISO, ANSI, liquid, gas, steam …), do not hesitate to contact us to discuss your requirements.

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