Cashco DA5 - Manual (Page 8)

IOM-DA5 8
be on upper side, “fl at” side down wards. For
metal diaphragm construction the “rounded”
surface of the lower diaphragm push er plate
(10) should be on upper side, “fl at” side down-
wards.
11. For composition diaphragm construction,
place new o-ring upper stem seal (14.1)
on/over upper end of valve plug (20) and
into groove of lower diaphragm pusher plate
(10).
12. For metal diaphragm construction, place
com pat i ble gasket sealant on both sides and
place new lower pusher plate gasket (14.4)
on/over upper end of valve plug (20) and onto
lower diaphragm pusher plate (10). (Gasket
sealant is Federal Process Corp. “Gasoila” , or
equal.) A Tefl on gasket (37) may alternatively
be fi tted between diaphragm and fl ange of
body.
13. Position new diaphragm(s) (9) on/over upper
end of valve plug (20). NOTE: For multiple
diaphragms (9) that include TFE material, the
TFE should be on the wetted side; for 3-ply
elastomeric TFE diaphragm (9), stackup is
TFE-HK-TFE, be gin ning with the low er wetted
diaphragm (9) fi rst.
14. Position upper diaphragm pressure plate (8)
on/over upper end of valve plug (20) prop-
erly oriented. For composition di a phragm
con struc tion the "tongue and groove" "ridge"
should be on lower side, "fl at" side upwards.
For metal diaphragm construction the "round-
ed" surface of the upper diaphragm pressure
plate (8) should be on lower side, "fl at" side
upwards.
15. a. Body sizes 1/2" thru 1": Engage di a -
phragm lock nut (7) to thread ed post
por tion of valve plug (20) and torque
to 60-70 ft-lbs. by rotating CW.
b. Body Sizes 1-1/4" thru 2": In sert anti-
seize coat ed di a phragm cap screw
(7) through stacked parts (8, 9, 10,
14.1, 14.4) and into upper end of valve
plug (20). Torque-tight en diaphragm
cap screw (7) to 120-130 ft-lbs.
c. Body Sizes 2-1/2" thru 4": En gage di a-
phragm lock nut (7) to threaded post
of valve plug (20) and wrench-tight en
fi rmly. While restraining valve plug
(20) from rotating by torque wrench
on upper end 3/4" hex, use another
wrench to tighten di a phragm locknut
(7) to a torque of 180 - 200 ft-lbs.
16. This completes assembly of ITA; remove from
vise.
F. Main Reassembly:
1. Place body (23) in a vise.
2. Reinstall internal sensing drilled plug (32) with
compatible thread sealant.
3. Fit the o-ring cage seal (15) into its body (23)
groove for reverse fl ow regulators.
4. For metal diaphragm construction, place
seal ant (“Gasoila” or equal) on both sides of
diaphragm gasket (37) and position on body
(23) diaphragm fl ange.
5. Position properly oriented lower cage gasket
(21) onto lower shoulder of cage (19).
6. Insert cage (19) into body (23) recess. Prop er ly
align all three cage bolt (18) holes as there is
only one cir cum fer en tial location pos si ble for
this align ment. Engage all of the cage bolts
(18), then evenly screw in the cage bolts in
one-half revolution increments, tak ing care
NOT TO “COCK” THE CAGE (19) IN THE
BODY. Torque the cage bolts (18) to 13-15
ft-lbs.
7. Dynamic Side Seals:
a. Type CP: Position the ITA's valve plug
(20) lower end over and into upper end
of cage (19) until the cap seal (27.1) edge
touch es the upper lip of the cage (19).
While gently ap ply ing force to press the
valve plug (20) into the cage (19), si mul ta-
neous ly use hand thumbs to light ly press
the cap seal (27.1) inwards into the groove
of the valve plug (20) until the cap seal
(27.1) “slips into” the cage (19). DO NOT
USE TOOLS, LU BRI CANT, OR HEAVY
FORCE TO ENGAGE THE CAP SEAL
(27.1) INTO THE CAGE (19). Do not press
inwards on the cap seal (27.1) too much
or the cap seal (27.1) may slide out of its
groove.
b. Type PR: Position the ITA's valve plug
(20) lower end over and into upper end
of cage (19) until the lower piston ring
seal (27.5) touch es the upper lip of the
cage (19). While gently applying force to
press the valve plug (20) into the cage
(19), simultaneously use fi ngers to lightly