12.
Once a satisfactory pressure adjustment has
been achieved, attach the “tamper-proof” seal
furnished with the external bypass valve to prevent
unauthorized adjustments.
13. Open the shut-off valve located on the pump discharge
line downstream of the external bypass valve and
continue pumping as needed.
WARNING: Do not adjust the external bypass
valve beyond the range of the spring being used .
NOTE: On Anhydrous Ammonia and LP-Gas
installations, follow the guidelines provided
by Underwriter’s Laboratories, Inc . and NFPA
Pamphlet # 58 .
Notice!
1. If the external automatic bypass valve is sized and set
correctly, a manual or hand operated bypass valve–
if applicable–should remain in the closed position
during normal operation. Keeping the manual or hand
operated bypass valve closed ensures the external
automatic bypass valve operates in a normal capacity.
2. Annual inspection and testing of the internal relief
valve–if applicable–and the external automatic bypass
valve are recommended. For testing procedures refer
to the adjustment procedures listed in this manual.
7
