LowFlow JR Series High Pressure Regulators - Manual (Page 3)

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pressure builds up beyond set up, a regulator may
or may not develop bubble tight shutoff.
12. Pressurize with air and spray liquid leak detector
around body (1) and spring housing (11) to test
for leakage. Ensure outlet pressure is maintained
during this leak test at mid-range spring level: i.e.
25-100 psig (1,7 - 6,9 barg) range spring, 60 psig
(4,3 barg) test pressure minimum.
C. Diaphragm Replacement
Caution! To prevent damage to body, use soft jaws
when placing the body in a vise. Position so that vise
closes over the flats on lower end of body.
1. Perform Steps 1 - 5 from Section B, Trim Replace-
ment.
2. Perform steps 10 - 12 from Section B, Trim Re-
placement.
Troubleshooting
If You Experience Erratic Operation; Chattering:
A. Oversize regulator; inadequate rangeability
1.
Check actuator flow conditions, re-size regula-
tor for minimum and maximum flow.
2. Increase flow rate.
3. Decrease regulator pressure drop; decrease
inlet pressure by placing a throttling orifice in
inlet piping.
4. Install next step higher range spring. Before
replacing regulator, contact factory.
B. Worn plug or seat; inadequate guiding. Replace
trim (possible body replacement).
C. Weakened/broken return spring. Determine if cor-
rosion is causing plug to not move freely. Replace
return spring, spring guide, and return spring
holder.
If the Regulator can’t pass sufficient flow:
A. Regulator not closing tightly. Inspect plug and seat
sub-assembly, replace if worn.
B. Downstream blockage
1.
Check system; isolate (block flow at regulator
inlet not outlet).
2. Relocate regulator if necessary
C. No pressure relief protection. Install safety relief
valve, or rupture disc.
D. Restricted diaphragm movement. Ensure no mois-
ture in spring chamber at temperature below free
point.