A pressure relief valve SDD 911 limits the static pressure to a constant and maximal settled value by opening the outlet (to the discharge line) when the pressure is overriding.
An EPDM diaphragm, PTFE coated, separates the mechanical parts body and the channel. All wetted parts are in plastics. The seat seal is in EPDM or FPM according to the model and connections.
Without any metallic parts exposed to the atmosphere it allows a location in corroding vapours.

The SDD 911 valves may be used as pressure relief valves on volumetric pumping system. These equipment protection devices may be fitted in any position, in line, or on by-pass according to the application.

Body: Glass fibre reinforced PPH
Diaphragm: PTFE coated EPDM
Seat seal and O-rings: EPDM or FPM
Pressure: Class PN 10 (at 20°C) ; [bar]
Dimensions: ND 15 to ND 25
Hysteresis: Approx. 0.3 bar

Connections:
DIN 8068 threaded
PVC union to glue on site
PPH union to weld on site

Temperature limits: PPH; 10 to 70°C – PVC; 10 to 50°C