(14) to hold the valve in an open condition. As the outlet
pressure exceeds the set pressure, the diaphragm, act-
ing upon the lower spring guide compresses the spring
allowing the lever assembly to close the valve until the
outlet pressure equalizes with the set pressure.
Maintenance
Routine maintenance should be expected due to normal
wear and tear, damage from external sources or debris.
The regulator components, especially the moving and
sealing parts, should be inspected periodically and re-
placed as necessary. Frequency of inspection/replace-
ment depends upon severity of conditions, but may also
be required by local/state/federal law or industry stan-
dards.
Large pressure drops or large amounts of particulate in
the flow will result in accelerated wear on the valve disc
assembly (21) and orifice (20).
Replacing the Orifice, Lever Assembly and Disk
Assembly
Disconnect piping form inlet adapter (18), removing
1.
adapter and four cap screws (17).
Remove orifice (20) and inlet body gasket (19).
2.
Remove vent piping if it is installed.
3.
Remove two cap screws (8), which secure the dia-
4.
phragm adapter (13) to the body (23). Remove the
diaphragm adapter and spring case (3) as a unit.
If the lever assembly is to be replaced, drive out
5.
the pin (15) and slide the lever assembly out of the
diaphragm adapter. When replacing the lever as-
sembly, make sure that the slot engages the con-
nector head assembly (12). Replace the pin.
Remove the valve carrier (22) from the body.
6.
Use a ¾” socket to remove and reinstall the valve
7.
disc and holder.
Discard old inlet body gaskets and replace with
8.
new. Reinstall the valve carrier into the body.
Reinstall the diaphragm adapter/spring housing
9.
unit, making sure that the lever assembly properly
engages the valve carrier. Finally, tighten the two
cap screws that secure the diaphragm adapter/
spring housing unit to the body. IMPORTANT:
Spring case (3) must be oriented such that it points
away from the inlet adapter (18).
Reinstall the inlet adapter to the body, installing and
10.
tightening four cap screws.
Replacing the Diaphragm
Remove spring tension by loosening the jam nut (2)
1.
and turning the adjusting screw (1) counterclock-
wise until all spring compression is relieved.
Start-Up Operation
WARNING! Release downstream pressure to
prevent a potential over-pressure of the dia-
phragm. Failure to do so may result in property
damage and/or personal injury. Always employ
upstream and downstream pressure gauges to
monitor startup pressures.
With the regulator isolated with shutoff valves on both
the upstream and downstream sides, slowly open up-
stream valve followed by slowly opening the downstream
valve. Check all connections for leaks and make neces-
sary output adjustments by manipulating the adjusting
screw (1) per the adjustment procedures below.
Adjustment
The range of adjustment for a particular regulator is
1.
indicated on the nameplate. Different ranges can
be achieved by substituting a different spring (5).
IMPORTANT: If a new spring is installed the
nameplate must be remarked to indicate the
new pressure range.
Refer to Tables 1 & 2 prior to adjustment for pres-
2.
sure and flow information, assuring that the chosen
spring will facilitate the desired pressure regulation
and that the maximum pressure output does not
exceed the downstream system pressure limits.
Loosen the jam nut (2).
3.
To INCREASE pressure:
4.
Turn adjustment screw
clockwise.
To DECREASE pressure:
5.
Turn adjustment screw
counterclockwise.
Once the desired pressure is achieved, hold adjust-
6.
ment screw while securing the jam nut.
Shutdown
WARNING! Downstream pressure must be re-
leased to prevent an over-pressurization of the
diaphragm. Failure to do so may result in prop-
erty damage and/or personal injury.
Close the upstream block valve followed by closing
1.
the downstream block valve.
Open the nearest vent valve between the regulator
2.
and the downstream block valve.
Operation
When the outlet pressure is lower than the set pres-
sure, force generated by the spring (5) upon the spring
guide (7) and diaphragm (11) causes the lever assembly
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