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BM6X Series
c. Now remount lever assembly (keys 17 and 2), rollers
(key 10), keeping them in their seat with grease, and stem
(key 6), which is to be turned so the rollers enter their
seats. The stem and lever assembly should now be tightly
fitted together.
d. Remount bushing (key 13), make sure that the dowels are
firmly set in the grooves of the stem (key 6).
e. Repeatedly check if pilot resets properly and, lastly,
remount minimum spring (key 54).
f. Always check controller setting.
Minimum and Maximum Setting
a. Make sure that the lever (key 33) is in horizontal position
when slam-shut controller is reset. If necessary, use
nut and locknut (keys 69 and 70) to adjust (see step b,
Reassembly section).
b. Use maximum adjusting nut (key 50) to completely load
maximum pressure spring (key 53). Loosen minimum
adjusting screw (key 49) to completely relieve minimum
pressure spring (key 54).
c. Disconnect pressure control pipe (A).
d. Through the pressure control connection, use a small
pump or other appropriate means to raise the pressure to
normal operating level.
e. Reset slam-shut controller and reduce the pressure until it
reaches minimum cutoff level.
TROUBLESHOOTING
SYMPTOMS
Slam-shut device does not remain set
Sleeve does not seal properly
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Table 8. Troubleshooting for BM6X Series Slam-Shut Valve
CAUSE
The actuator impulse intake (A) is not
connected properly
Downstream pressure coincides with the
maximum or minimum slam-shut settings
Diaphragm (key 62) is damaged
(Lip seal (key 66) on Types OS/84X-R
and OS/88X-R)
Worn seal gaskets
Dirt deposit on sleeve
Shaft (key 2) damaged
f. Use minimum adjusting screw (key 49) to load spring
(key 54) slowly until pilot is triggered.
g. Repeat procedures (d) and (e) above, making any
necessary adjustment in the setting.
h. Bring pressure back to normal values.
i. Reset controller and raise the pressure until it reaches
maximum cutoff level.
j. Using maximum adjusting nut (key 50), slowly unload
spring (key 53) until cut-off point is reached.
k. Repeat procedures (h) and (i) above, making any
adjustment necessary in the setting.
Whenever minimum or maximum pressure
setting is not required, omit corresponding steps.
SPARE PARTS
Spare parts storage shall be done by proper procedures
according to national standard/rules to avoid over aging or
any damage.
CAUTION
ACTIONS
Check connections (A)
Check slam-shut settings
Replace the diaphragm
Check gaskets
Check sleeve
Check shaft
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