Jordan Valve Mark 608BP - Balanced Plug Regulator - Manual (Page 2)

parts and for proper nomenclature.
A. DIAPHRAGM OR GASKET REPLACEMENT
1. Remove all pressure from the line as outlined un-
der WARNING.
2. Remove the compression of the adjusting spring
(22) by rotating the adjusting screw (19) counter-
clockwise.
3. Loosen the spring housing bolts (16) and remove
spring housing.
IF DIAPHRAGM IS NOT BEING REPLACED,
SKIP STEPS 4 THRU 8.
4. Remove diaphragm subassembly by sliding it away
from the valve body to disengage the lever arm (7).
5. Hold the lower diaphragm plate (5) and remove the
screw (6), separating the parts.
6. Clean the surfaces on the upper and lower dia-
phragm plates that the diaphragm (3) seats against.
Clean and degrease the threads on the lower dia-
phragm plate and the screw. (Degrease with Loc-
tite primer T.)
7. Assemble the upper and lower diaphragm plates
to the new diaphragm with the screw. (Apply a few
drops of Loctite #290 to the screw threads to lock
the parts together.) The hole through the lower dia-
phragm plate must align with any pair of opposite
holes in the diaphragm so that it will properly en-
gage the lever when reassembled into the valve.
8. Clean the flange surface on the diaphragm housing
and reinstall the diaphragm subassembly onto the
lever arm.
9. Clean the flange surface on the spring housing and
install a new gasket. The gasket may be temporarily
held in place using a few dabs of grease.
10. Set the spring housing on top of the diaphragm
housing. Using a 6” long screwdriver, or similar
tool, reach through the spring housing and push
the diaphragm down to align the diaphragm holes
with the housings’ holes.
11. Drop the bolts into place and attach the lockwash-
ers and nuts, finger-right.
12. Continue to push the diaphragm down and snug-
up the bolts.
13. Evenly torque the bolts as described in the Torque
Procedure Section.
14. Install the spring and adjusting screw. (Adjusting
spring per start-up instructions and replace cap.)
B. SEAT INSERT, PLUG, OR ASPIRATOR REPLACEMENT
CAUTION: When replacing a plug or seat insert,
the lever must also be replaced to insure shutoff.
1. Remove all pressure from the line as outlined un-
der WARNING.
the Mark 608 Product Bulletin. Always use the smallest
orifice diameter possible to reduce outlet pressure varia-
tions caused by inlet pressure variations.
Start-Up
1. Fully open the outlet shut-off valve.
2. Slowly open the inlet shut-off valve.
3. Slowly open and close the outlet shut-off valve
several times. This fully strokes the valve to insure
satisfactory operation.
4. With the outlet shut-off valve open and preferably
at a low flow, slowly turn the adjusting screw until
the desired pressure is shown on the outlet pres-
sure gauge.
5. To change the controlled pressure, turn the ad-
justing screw clockwise to increase pressure, and
counterclockwise to decrease pressure.
Trouble Shooting
If You Experience Erratic Control:
 Oversizing causes cycling and hunting and reduces
the rangeability of the valve. Make certain that your
sizing is correct.
 Attempting to exceed flow capacity. Make certain
that your sizing is correct.
 Blocked vent line or vent passage in spring hous-
ing. Clean.
 Inlet pressure varying greatly. Stabilize or use sec-
ond regulator to control inlet pressure closer.
 Aspirator blocked. Clean.
If You Cannot Set Outlet Pressure:
 Orifice too large for inlet pressure. Refer to Sizing.
 Improper spring.
If the Valve Will Not Operate:
 Diaphragm ruptured. Replace.
 Adjusting spring broken. Replace.
 Improper spring setting. Reset.
Maintenance
WARNING: Be sure that there is no pressure in the
valve before loosening any fittings or joints. The fol-
lowing steps are recommended:
1. Close the inlet shut-off valve, and by-pass valve.
2. Back off adjusting screw to allow inlet pressure to
open seats.
3. Allow pressure to bleed off through downstream
piping.
4. When the inlet pressure gauge indicates no pres-
sure in the line, close the outlet shut-off valve.
Refer to the drawings for the proper orientation of the
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