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CAUSES
10. Rapid pressure drop on both High and Low Pressure Gauges.
a. Loose connection – Bonnet to
Body.
b. Loose connection – Regulator to
Test Manifold.
11. Rapid increase in Low Pressure Gauge reading.
a. Damaged or loose Nozzle.
b. Heavy accumulation of foreign
particles on Seat Assembly or
seating surfaces.
c. Missing or damaged Nozzle O-
Ring.
d. Improper Adjusting Spring (spring
too long).
12. Relief Valve opens at a greater or less than marked pressure (outside a pressure
tolerance of ±15% of the marked pressure).
a. Incorrect Spring used.
b. Relief Valve not set properly.
ESS3/ESS4
POSSIBLE CORRECTIVE ACTIONS
Tighten Bonnet Screws using 12-15 ft-lbs.
Follow the sequence shown in STEP 19
FIGURE 1 of the Assembly Procedure.
Insure Regulator is securely tightened to the
Manifold.
Replace and/or tighten the Nozzle to 20 ft-lbs
torque.
Clean seating surfaces and/or replace Seat
Assembly.
Inspect and install or replace O-Ring as
necessary.
Replace Adjusting Spring.
Replace with correct Spring.
Repeat Relief Valve assembly/test procedure
STEP 8.
- 14 -
SECTION 1
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