Carmo’s pressure-relief valve protects an inflated product from bursting: it opens automatically when the internal pressure reaches a set point: nominal opening pressure 0.07 bar: then reseals.

Protection against bursting

It is built for inflatable products that must be safeguarded against over-pressure, buoys, ballast and lifting bags, tanks and sacks, where pressure can rise as temperature climbs. The flange is PVC/PUR; the valve body is ABS with a metal element. The point is simple: the product has to fail safe, not fail open.

On the modular flange

Like the rest of the system, the relief valve sits on the common G3/4″ weldable flange, interchangeable with the inflation/pressure and vacuum valves. HF weld time is about 1.5–2 seconds depending on material thickness; the flange can also be bonded for small runs and prototypes. Built for a long service life in harsh conditions, saltwater, UV, freeze-thaw and repeated pressure cycling, and produced on one ISO-certified site in Denmark.

Carmo A/S's quality management system is certified to ISO 13485:2016 Medical devices quality management system by Bureau Veritas (accredited by DANAK), certificate no. DK020611. Scope: Design, development, manufacture and assembly of injection molded plastic components. Valid: 2. September 2026 – 1. September 2029.

All Carmo plastic components are manufactured under the same QMS and procedures.


Ordering and variant information

All measurements and drawings are nominal. For exact measurements - and for critical integration - please contact sales for detailed drawings.


03-374

Pressure Relief Valve with G 3/4" pipe thread

ABS Pressure Relief valve with G3/4" thread. A low profile relief valve opening in the range of 0.05-0.12 Bar: This prevents bursting due to excess pressure.
Interested in other colors or materials? Please call for quote...
Small drawing of 03-374 Pressure Relief Valve with G 3/4" pipe thread
Big drawing of 03-374 Pressure Relief Valve with G 3/4" pipe thread
Nominal measurements in mm
Nominal measurements in mm
03-601

Threaded plastic flange with thread G 3/4"

HF/ultrasonic weldable plastic flange with internal G3/4" thread. Weldable onto PVC and PUR materials. Industry standard thread, compatible with a range of Carmo fittings and those of other manufacturers.
Interested in other colors or materials? Please call for quote...
Small drawing of 03-601 Threaded plastic flange with thread G 3/4"
Big drawing of 03-601 Threaded plastic flange with thread G 3/4"
Nominal measurements in mm
Nominal measurements in mm

(*) Smaller quantities can be delivered on request for a repacking fee.