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Figure 8. Type EZR X Body with Integral Type OS2 Slam Shut and Type PRX Pilot
Slam Shut
The pressure of the zone to be protected (generally the
pipeline on the outlet side of the regulator and after the slam
shut) is sensed by the safety manometric box (Type BMS).
If the pressure exceeds the set tripping pressure, the
release relay frees the valve plug.
Due to the force of the closing spring and the fluid (trying to
close), the valve plug closes on the seat.
The gas flow is obstructed until the fault has been corrected
and the mechanism box manually rearmed.
To reopen the valve plug an equal pressure balance on inlet
and outlet sides of the regulator is required.
The mechanism box is rearmed after opening the
internal bypass.
Rearming and balancing are achieved at the same time.
Type EZR
B18B
9
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