Jordan Valve Mark 508 Series – Tank Blanketing Valve - Manual (Page 3)

9. Remove the pin (10), replace the lever and reassemble with
the screws.
10. Apply a drop of Loctite #290 to each screw and reinstall the
lever arm bracket. Align the slot in the plug's stem with the
new lever arm and tighten the pivot bracket's mounting
screws. Check for free movement. Be certain that there is a
gasket (29) between the aspirator flange and the diaphragm
housing, and a gasket (30) in the body cavity where the
aspirator fits.
11. Re-attach body and actuator with the union nut (being care-
ful to align the aspirator tube to the slot in the body). Pull up
hand-tight, then tighten further 1/4 turn. (The union nut is 8-
sided and may be used as a guide).
12. If lever arm was replaced, apply 25-150 psi pressure through
outlet. This will set linkage and prevent overpressure (in
operation) from bending the linkage and causing set point
changes. Seat leakage may be checked by observing any
leakage from inlet.
MK508 only
13. Reverse steps 3b and 4b to complete valve-reassembly.
Seat leakage may be checked by observing any leakage from
inlet.
C. SPRING REPLACEMENT.
1. To replace a spring, remove the cap (21) and the adjusting
screw (19). Then remove the spring.
CAUTION: IF A DIFFERENT RANGE SPRING IS BEING IN-
STALLED, BE SURE THE PROPER ADJUSTING SCREW IS
USED. (THE 3.5 psi RANGE USES DIFFERENT ADJUSTING
SCREW.) FAILURE TO OBSERVE THIS CAUTION COULD RE-
SULT IN VALVE DAMAGE OR FAILURE TO SHUT OFF. IT IS
RECOMMENDED THAT A NEW TAG BE ISSUED FOR THIS
VALVE WITH CORRECT SPRING RANGE.
2. Reinstall spring and adjusting screw. Adjust spring per start-
up instructions. Replace cap.
D. DIAPHRAGM OR SPRING HOUSING REPLACEMENT.
CAUTION: IF THE SPRING HOUSING IS TO BE REPLACED,
THE LEVER MUST BE REPLACED TO INSURE SHUT-OFF.
1. Remove all pressure from the line as outlined under WARNING.
2. Remove the compression of the spring (22) by rotating the
adjusting screw (19) counterclockwise.
3. Loosen the spring housing bolts (16) and remove spring
housing.
4. Remove diaphragm subassembly by sliding it away from the
valve body to disengage the lever arm (7).
5. Remove the two screws (9) fastening the lever arm bracket to
the diaphragm housing and lift out the lever arm bracket with
the lever arm.
6. Remove the screws from the lever arm bracket and clean the
threads. Degrease with Loctite Primer T. Also clean and
degrease the tapped holes in the diaphragm housing.
7. Remove the pin (10), replace the lever arm and reassemble
with the screws.
8. Apply a drop of Loctite #290 to each screw and reinstall the
lever arm bracket. Align the slot in the plug’s stem with the
new lever arm and tighten the pivot bracket’s mounting
screws. Check for free movement.
9. Clean the flange surface on the diaphragm housing and re-
install the diaphragm subassembly onto the lever. (Assem-
bly of a new diaphragm subassembly is covered in A1 thru
A7.)
10. If a new spring housing is being used, take the new spring
housing and carefully drive a new stop pin (23) into the
hole in the housing neck with a hammer. (This serves as a
spring adjusting screw stop and must be installed.)
11. Clean the flange surface on the spring housing and reinstall
a new gasket (13). The gasket may be temporarily held in
place using a few dabs of grease.
12. Set the spring housing on top of the diaphragm housing.
Using a 6” screwdriver, or similar tool, reach through the
spring housing and push the diaphragm down to align the
diaphragm holes with the housings’ holes.
13. Drop the bolts into place and attach the lockwashers and
nuts, finger-tight.
14. Continue to push the diaphragm down and snug-up the
bolts.
15. Evenly torque the bolts as described in Figure 3.
16. Apply 25-150 psi pressure through valve outlet. This will set
linkage and prevent overpressure in operation from bend-
ing the linkage and causing setpoint changes. Seat leak-
age may be checked by observing any leakage from inlet.
Torque Procedure
1. Install all bots hand-tight.
2. Torque the bolts in order of
the bolt pattern to approx. 75
in-lbs
3. Retorque each bolt to 300
in-lbs, using the same bolt
pattern as shown.
7
3
5
1
8
4
6
2
8 Bolts (or multiples)
Figure 3