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3.3 Diaphragm-Flange Leakage
If valve diaphragm flange area leaks, depressurize
system and open valve slightly, using the wrench
opening device (3” & 4”Series 47 only, DIN 80 & 100
only) or a local bleed type regulator. Tighten bonnet
bolts as described in Section 1.2. If leakage contin-
ues, valve diaphragm replacement is required.
3.4 Lubrication
Standard lubricant is Chevron Poly FM2 (FDA
Compliant) for all Pure
-Flo
®
valves (1/4” through 4”,
DIN 8 - 100) and 1/4” through 2” (DIN 8 - 50)
Dia
-Flo
®
valves. Sunoco 991EP is standard for 3” or
4” (DIN 80 or 100) Dia
-Flo
®
valves. The 3” & 4” (DIN
80 & 100) unit requires Never-Seez on the adjusting
bushing/spindle threaded joint and on the travel stop
nuts/adjusting bushing threaded joint. Actuators
should be lubricated in the spindle/o-ring area when-
ever the actuator is disassembled.
3.5 Advantage
®
Actuator to Valve Body
Mounting Instructions
For double acting (A3YY) and spring-to open (A1YY)
actuators, regulate air pressure in upper cover to
extend the compressor and assemble valve
diaphragm. Correctly position the diaphragm with
bolt holes then back the regulator off until the
diaphragm just rest against the lower cover.
Spring-to close (A2YY) units require air pressure reg-
ulated in the lower cover to properly locate the valve
diaphragm.
1/4” through 2” (DIN 8 - 50):
Apply a dab of Dow Corning
®
111, which has FDA
compliance to Title 21 CFR 175.300, to the lead
thread of each lower cover insert. (DO NOT
OVER-LUBRICATE.) No lubricants are permissible
on the diaphragm seal face or body interior/seal
area.
Assemble valve body using the torques shown in Table
1.
3.6 Double Acting
(REMOVE ALL LINE PRESSURE)
3.6.1 Valve Diaphragm Replacement
3.6.1.1 Disconnect air lines. Remove bonnet
bolts, lift actuator assembly from valve
body.
3.6.1.2 Unscrew diaphragm from compressor
by turning counterclockwise.
3.6.1.3 For PTFE assemblies only: Replace back-
ing cushion and PTFE diaphragm.
Note: To engage the threads of the
diaphragm stud invert the PTFE
diaphragm. To invert the diaphragm,
press on the center of the
diaphragm face with thumbs while
holding the edge of the diaphragm
with fingers.
3.6.1.4 Screw new diaphragm into compressor
until hand tight. DO NOT OVERTIGHT-
EN. Then back off until bolt holes in
diaphragm and bonnet flange align.
3.6.1.5 Replace actuator assembly on body
and tighten bonnet bolts with a
wrench, crisscrossing from corner to
corner. See Table 1 for recommended
torques.
3.6.1.6 Travel stop, if equipped, must
be reset
at this time to assure proper closure.
See Section 4.1.
3.6.2 Actuator Diaphragm Replacement:
(1/4” through 2”, DIN 8 - 50)
3.6.2.1 Disconnect air lines. Remove actuator
bolts and remove top cover.
3.6.2.2 Remove indicating spindle, diaphragm
top plate and actuator diaphragm.
3.6.2.3 Install new diaphragm top hat up, use
Blue Loctite #242 on the indicating
spindle.
3.6.2.4 Assemble top cover, using care to keep
the air fitting in line with the lower
cover air fitting.
3.6.2.5 See Table #1 for fastener
torques.
3.6.3 Actuator Diaphragm Replacement:
(3” & 4” Series 47, DIN 80 & 100)
3.6.3.1Disconnect air lines. It is best to
remove the bonnet bolts, lift actuator
assembly from the valve body and
move the unit to a bench. Remove
clear plastic cap, travel stop nuts,
roller-bearing/races, actuator bolts and
nuts. Remove top cover.
3.6.3.2 Remove adjusting bushing, spindle
nut, diaphragm top plate and actuator
diaphragm.
3.6.3.3 Install new diaphragm, top hat up.
Reassembly is the reverse of the above,
use Blue Loctite #242 on the spindle
nut. Be sure to set the adjusting bush-
ing at the correct position 4.06”
(10.31 cm) from top of the spindle nut
to bottom of adjusting bushing), see
Figure 1. See Table 1 for fastener
torques.
(3” & 4” Series 33, DIN 80 & 100)
3.6.3.4Disconnect air lines. It is best to
remove the bonnet bolts, lift actuator
assembly from the valve body and
move the unit to a bench. Remove
actuator bolts and remove top cover.
3.6.3.5 Remove extension spindle, both nuts,
diaphragm top plate and actuator
diaphragm.
3.6.3.6
Install new diaphragm, top hat up. Be
sure the diaphragm is positioned so
the diaphragm bolt holes line up with