11
Type BM5A
Replacing O-ring
(Types OS/84X and OS/88X only)
1. Remove plug (key 61) and extract piston (key 68)
from body (key 60).
2. Replace O-ring (key 67) and Gaco flex (key 66).
3. Reassemble in the reverse order of the
above procedures.
Reassembly
Reassemble all parts in the reverse order of the steps
in the disassembly section.
As you proceed, make sure all parts move freely
without too much friction. If necessary, lubricate them
with silicone-based lubricant.
Make sure to:
1. Screw the nuts (keys 30 and 18) without
overtightening them to allow the levers (keys 33,
36 and 20) to move freely without friction.
2. Before mounting minimum (UPSO) spring
(key 54), register position of lever (key 33) by
means of nut (key 70), locking it into place with
locknut (key 69).
Note
The lever (key 33) is in proper position
when it is exactly horizontal and in the
center of the groove of lever (key 36).
3. Remount lever assembly (keys 17 and 2), balls
(key 10) or rollers for Type OS/80X-R, keeping
them in their seat with grease and stem (key 6),
which is to be turned so the balls/rollers enter their
seats. The stem and lever assembly should now
be tightly fitted together.
4. Remount bushing (key 13); make sure that the
dowels (key 12) are firmly set in the grooves of the
stem (key 6).
5. Repeatedly check if pilot resets properly and,
lastly, remount minimum (UPSO) spring (key 54).
6. Check controller setting.
Periodical Checks
Perform the following procedures to check that the
slam-shut valve is working properly.
Cut-off Test
1. Cut-off the fluid flow to slam shut valve by
closing upstream and downstream isolation
valves and disconnect the pressure sensing line
to port A of slam shut controller. The slam-shut
controller should cut-off for minimum pressure
(Underpressure Shut-off - UPSO), if set.
2. Through port A, using a small pump or other
appropriate means, raise the pressure to normal
operating level. Reset slam-shut controller if it was
cut-off in step 1.
3. Simulate pressure increase until maximum
pressure cutoff value (Overpressure Shut-off –
OPSO) is reached. The slam-shut valve should
cut-off at this point.
4. Connect the sensing line back to port A of the
controller and return the slam shut valve to
operating conditions by following the instructions
described in the Startup section.
Valve-seal Check
1. Slowly close the downstream isolation valve.
2. Press the “EMERGENCY” button. The slam-shut
controller should immediately close and cut-off the
flow through the valve.
3. Loosen a connector in the downstream line of
the slam-shut valve or of the regulator. Check
the connector with soap and water, to make sure
there are no leaks; repair the slam-shut valve
if necessary.
Parts Ordering
When corresponding with our local Sales Office about
this equipment or to order spare parts or kit, always
refer to the type of slam-shut valve or slam-shut
controller and its serial number.
When ordering replacement parts, reference the key
number of each needed part as found in the following
parts list.
Spare Parts
Store spare parts in compliance with national
standard/rules to avoid over aging or any damage.
