Asco 8344 Installation and operating instructions

Page 1 of 4 (Section 1 of 2)
50 Hanover Road, Florham Park, Ne Jersey 07932 .ascovalve.com All Rights Reserved.
E176963
Installation & Maintenance Instructions SERIES
8344
4-WAY HEAVY DUTY SIN LE SOLENOID VALVES
1/4I, 3/8I, 1/2I, 3/4I OR 1I NPT
1/4I, 3/8I OR 3/4I ORIFICE I&M No.V7544 -Sec. 1
(Section 1 of 2)
NOTICE: See separate solenoid installation and
maintenance instructions for information on: Wiring,
Solenoid Temperature, Cause of Improper Operation and
Coil Replacement.
DESCRIPTION
Series 8344 valves are packless, solenoid pilot controlled, heavy duty, 4-way
valves with for ed brass valve bodies and poppet type main discs. The main
discs are power driven in both directions by line pressure. No return sprin s
are required. Valves may be provided with a eneral purpose/waterti ht,
open frame, or waterti ht/explosionproof solenoids.
OPER TION
Solenoid De-Energized: Flow is from Pressure P to Cylinder A and from
Cylinder B to Exhaust E.
Solenoid Energized: Flow is from Pressure P to Cylinder B and from Cylinder
A to Exhaust E.
Minimum on time for valve is 0.3 seconds on air service and 1.0 seconds on
liquids
IMPORT NT: Minimum operating pressure differential is 10
psi on air, gas or water and 25 psi on hydraulic oil (300 S.S.U.).
Cyl. ACyl. B
Press. Exh.
PE
Press. Exh.
PE
Cyl. ACyl. B
FLOW DIAGRAM for Single Solenoid
De-Energized Energized
Manual Operator (optional feature)
Manual operator allows manual operation when desired or durin an electrical
power outa e. To en a e manual operator (open the valve), turn lever clockwise
until it hits a stop. Valve will now be in the same position as when the solenoid
is ener ized. To disen a e manual operator (close the valve) turn lever
counterclockwise until it hits a stop.
CAUTION: For valve to operate electrically, manual
operator lever must be fully rotated counterclockwise.
SPEED/FLOW CONTROL-METERING DEVICE
Speed/flow control valves (2) may be added to allow full unrestricted flow in
one direction and controlled flow in the opposite direction. These valves
must be in the A" and/or B" cylinder pipin , between the solenoid valve and
the cylinder.
IMPORT NT: Do not install the speed control or any other
restrictive device in either the pressure (inlet) connection or
the exhaust (outlet) connection of the valve. Restricting either
of these lines may cause valve malfunction.
metering knob stem
locking pa l
bonnet
body gasket
stem gasket
spring
valve body
disc
FREE FLOW METERED FLOW
INST LL TION
Check nameplate for correct catalo number, pressure, and service. Never
apply incompatible fluids or exceed pressure ratin of the valve. Installation
and valve maintenance to be performed by qualified personnel.
Positioning
This valve is desi ned to perform properly when mounted in any position.
However, for optimum life and performance, the operator should be
mounted vertically and upri ht to reduce the possibility of forei n matter
accumulatin in the pneumatic operator.
Piping
Connect pipin or tubin to valve accordin to markin s on valve body. Refer
to flow dia rams. Apply pipe compound sparin ly to male pipe threads only.
If applied to valve threads, the compound may enter the valve and cause
operational difficulty. Avoid pipe strain by properly supportin and ali nin
pipin . When ti htenin the pipe, do not use valve or pneumatic operator as
a lever. Locate wrenches applied to valve body or pipin as close as possible
to connection point.
To insure proper operation of the valve, the pressure and exhaust lines must
be full area without restriction. A minimum differential pressure as stamped
on the nameplate must be maintained between pressure and exhaust at the
moment of shiftin . Air reservoirs must have adequate capacity to maintain
this minimum pressure durin shiftin . To check pressure durin shiftin ,
install a pressure au e in the pressure pipin as close to the valve as possible.
Po er Line
Wiring Diagram for
Single Solenoid
Pressure P" Exhaust E"
Cylinder B" Cylinder A"
Location of Metering
Devices hen used
Pressure guage
location
Full size piping ithout
restrictions must be
used on pressure and
exhaust lines.
M INTEN NCE
WARNIN : To prevent the possibility of death,
personal injury or property damage, depressurize
valve (main and auxiliary pressure lines), and vent
fluid to a safe area before servicing the valve.
NOTE: It is not necessary to remove the valve body from the pipeline for repairs.

I&M No.V5744-Sec.1
50 Hanover Road, Florham Park, Ne Jersey 07932 .ascovalve.com
Page 2 of 4 (Section 1 of 2)
Temperature Limitations
Valves with desi n chan e letter K" or P" within the catalo number
(example: 8344K074) have a maximum fluid temperature of 180_F. Refer to
separate solenoid Installation and Maintenance Instructions for maximum
ambient temperature.
Future Service Considerations
Provision should be made for performin seat leaka e, external leaka e, and
operational tests on the valve with a nonhazardous, noncombustible fluid
after disassembly and reassembly.
Cleaning
All pneumatic operated valves should be cleaned periodically. The time
between cleanin s will vary dependin on the medium and service conditions.
In eneral, slu ish valve operation, excessive noise or leaka e will indicate
that cleanin is required. In the extreme case, faulty valve operation will
occur and the valve may fail to shift. Clean stainer or filter when cleanin the
valve.
Preventive Maintenance
SKeep the medium flowin throu h the valve as free from dirt and forei n
material as possible.
SWhile in service, the valve should be operated at least once a month to
insure proper openin and closin .
SDependin on the medium and service condition, periodic inspection of
internal valve parts for dama e or excessive wear is recommended.
Thorou hly clean all parts. If parts are worn or dama ed, install a
complete ASCO Rebuild Kit.
Causes Of Improper Operation
SIncorrect Pressure: Check valve pressure. Pressure to valve must be
within ran e specified on nameplate.
SExcessive Leakage: Disassemble valve and install a complete ASCO
Rebuild Kit.
Valve Disassembly for 1/4I, 3/8I and 1/2INPT Valves
1. Disassemble valve in an orderly fashion usin exploded views for
identification of parts.
2. Remove solenoid, see separate instructions.
3. Unscrew solenoid base sub-assembly. For AC/DC Construction,
remove core assembly with sprin , core uide and body asket.
4. A 4-40 machine screw provided in ASCO Rebuild Kit serves as a
self-tappin screw to remove insert from body. Thread screw a few
turns into throu h hole located in flat surface of the insert.
C UTION: Do not damage center hole (pilot orifice) in
raised surface of insert.
5. Remove insert by usin a pair of pliers to rip the head of the screw.
Then pull insert with askets from body insert cavity.
6. Remove three askets from insert. Ta each as they are removed so
that they can be reassembled in the same location. Middle and lower
askets are the same size, however, the lower asket is a softer material.
7. Remove body screws/lockwashers (4) from piston end body. Slip
piston end body off piston/shaft sub-assembly.
8. Slide piston/shaft sub-assembly from main valve body. The
piston/shaft sub-assembly is comprised of the main shaft, locknut,
shaft asket, piston, body u-cup, uide u-cup, u-cup o-rin (only
present in 3/8I or 1/2I NPT valves with 3/8I orifice), piston end uide,
uide askets (2) and resilient disc.
9. Remove uide askets (2), one from either side of piston end uide.
10. Disassemble piston/shaft sub-assembly by insertin a brass rod (of
suitable size) in cross hole in shaft. Rod must be brass or other soft
material so as not to burr the ed es of hole. Hold piston shaft firmly
(with rod) and unscrew locknut. Disassemble piston/shaft
sub-assembly in an orderly fashion. Do not dama e or mar any of the
parts.
11. Remove locknut, shaft asket, piston with body and uide u-cups (2)
attached. Slide piston end uide and resilient main disc off main shaft.
12. Remove body u-cups and uide u-cup from piston. For 3/8I or 1/2I
NPT valves with 3/8I orifice, remove u-cup o-rin from uide
u-cup.
13. Unscrew seat from opposite end of main body. Remove lar e and
small seat askets (2) from seat. Then remove resilient main disc from
body bore.
14. All parts are now accessible to clean or replace. If parts are worn or
dama ed, install a complete ASCO Rebuild Kit.
Valve Reassembly for 1/4I, 3/8I and 1/2INPT Valves
1. Lubricate lar e and small seat askets, upper, middle, and lower insert
askets with DOW CORNINGr 200 Fluid lubricant or an equivalent
hi h- rade silicone fluid lubricant.
2. Lubricate all remainin askets, u-cups, bores of piston, piston end
body, main disc slidin area on the main shaft and valve body insert
cavity with a li ht coat with DOW CORNINGr 111 Compound
lubricant.
30_chamfer
lubrication
points
Partial cuta ay vie
of valve body to
sho insert cavity
lubrication points.
Figure 1. Lubrication of body insert cavity.
3. Preassemble piston/shaft sub-assembly as follows:
A. Position resilient main disc on main shaft so that resilient side of
main disc is facin the piston end uide.
B. Position piston end uide on main shaft.
C. Install body u-cup and uide u-cup onto piston. Open end of
uide u-cup faces the main valve body, while open end of body
u-cup faces the piston end body. For 3/8I or 1/2I NPT valves
with 3/8Iorifice, install a u-cup o-rin inside the uide u-cup.
D. Position piston assembly on main shaft.
E. Replace shaft asket and locknut. Ti hten locknut while holdin
the main shaft as described in Valve Disassembly section step 10.
For 3/8I and 1/2I NPT valve with 3/8Iorifice, torque locknut to
125 ± 10 in-lbs [14,1 ± 1,1 Nm]. For 1/4I or 3/8INPT valve with
1/4I orifice, torque locknut to 50 ± 5 in-lbs
[5,7 ± 0,6 Nm].
F. Position uide askets (2) one on uide facin piston end body,
the other in counterbore of main valve body.
4. Install piston/shaft sub-assembly into main valve body.
5. Install small body askets (2) into counterbores in piston end body.
6. Slip piston end body over piston/shaft sub-assembly and replace body
screws with lockwashers (4). Torque screws in a crisscross manner to
40 ± 5 in-lbs [4,5 ± 0,6 Nm].
7. Install resilient main disc at opposite end of main shaft; be sure
resilient side is facin seat.
8. Install seat with lar e and small seat askets attached. Torque seat to
40 ± 5 ft-lbs [54,2 ± 6,8 Nm].
9. Position lower insert asket and disc holder sprin in body insert cavity.
10. Snap upper and middle insert askets into rooves of insert. Lower
insert asket fits into the recess between the lower corner of the insert
and the lower corner of the body insert cavity. Middle and lower insert
askets are the same size. However, the lower asket is made of a softer
material.
11. Place disc holder sub-assembly into insert. Install insert (with askets
and disc holder assembly) into body insert cavity, makin certain that
the disc holder sprin is centered. Rotate this assembly sli htly while
pushin downward to aid installation.

Page 3 of 8 (Section 1 of 2)
I&M No.V7544-Sec.1
50 Hanover Road, Florham Park, Ne Jersey 07932 .ascovalve.com
WARNIN : To prevent the possibility of death,
personal injury or property damage, check valve
for proper operation before returning to service.
Also perform internal seat and external leakage
tests with a nonhazardous, noncombustible fluid.
12. Restore auxiliary and main line pressure to valve.
Valve Disassembly for 3/4I or 1I NPT Valves
1. Disassemble valve in an orderly fashion usin exploded view for
identification and placement of parts.
2. A 4-40 machine screw provided in ASCO Rebuild Kit serves as a
self-tappin screw to remove insert from body. Thread screw a few
turns into throu h hole located in flat surface of the insert.
C UTION: Do not damage center hole (pilot orifice) in
raised surface of insert.
3. Remove insert by usin a pair of pliers to rip the head of the screw.
Then pull insert with askets from body insert cavity.
4. Remove three askets from insert. Ta each as they are removed so
that they can be reassembled in the same location. Middle and lower
askets are the same size, however, the lower asket is a softer material.
Then remove disc holder sub-assembly and disc holder sprin .
5. Remove lon body screws with lockwashers (4) from piston end body.
Slip piston end body off piston/shaft sub-assembly.
6. Remove small body askets (2) from counterbores in piston end body.
7. Slide piston/shaft sub-assembly from main valve body. The
piston/shaft sub-assembly is comprised of the main shaft, shaft nut,
shaft washer, piston, body u-cup, uide u-cup, shaft asket, piston
uide, seat asket, uide askets (2) and a resilient main disc.
8. Disassemble piston/shaft assembly by insertin a brass rod (of suitable
size) into cross hole in shaft. Rod must be brass or made of another
soft material, so as not to burr ed es of hole. Hold piston shaft firmly
(with rod) and unscrew shaft nut.
9. Disassemble piston/shaft sub-assembly in an orderly fashion. Be
careful not to dama e or mar any of the parts.
10. Remove shaft nut, shaft washer, piston with body and uide-u-cups
(2) attached from shaft. Then remove body u-cup and uide u-cup
from piston.
11. Remove shaft asket, piston uide, uide askets (2) seat asket, and
resilient main disc.
12. Remove short body screws with lockwashers (4) from opposite end of
main valve body. Remove body/seat asket and seat asket from seat.
Then remove the other resilient main disc from bore of main valve
body.
13. All parts are now accessible to clean or replace. If parts are worn or
dama ed install a complete ASCO Rebuild Kit.
Valve Reassembly for 3/4I or 1I NPT Valves
1. Lubricate body/seat asket, seat asket, upper, middle and lower insert
askets with DOW CORNINGr 200 Fluid lubricant or an equivalent
hi h- rade silicone fluid lubricant.
2. Lubricate all remainin askets, u-cups, bores of piston, piston end
body, main disc slidin area on the main shaft and valve body insert
cavity (see Fi ure 3) with a li ht coat with DOW CORNINGr 111
Compound lubricant.
3. Preassemble piston/shaft sub-assembly as follows:
A. Position resilient main disc on shaft so that resilient lip side of
disc is facin the piston uide.
B. Install seat asket and uide askets (2) on piston uide.
C. Slip piston uide with askets onto shaft.
D. Position shaft asket on shaft.
E. Install uide u-cup and body u-cup on piston. Make certain
that open end of uide u-cup faces, the main valve body, while
open end of body u-cup faces the piston end body. Position the
piston with u-cups on shaft.
F. Replace shaft washer and shaft nut. Torque the shaft nut to 125
± 10 in-lbs [14,1 ± 1,1 Nm] while holdin the shaft as described
in Valve Disassembly for 3/4I or 1I NPT valves section step 9.
4. Install piston/shaft sub-assembly in main valve body.
5. Position small body askets (2) in counterbores in piston end body.
6. Slip piston end body over the piston/shaft sub-assembly. Then install
lon body screws with lockwashers (4). Torque the lon body screws in
a crisscross manner to 40 ± 5 in-lbs [4,5 ± 0,6 Nm].
7. Install resilient main disc at opposite end of main shaft. Be sure
resilient side of disc is facin seat.
8. Position seat asket and body/seat asket on seat.
9. Install seat with askets into main valve body. Replace short body
screws with lockwashers (4). Torque body screws in a crisscross
manner to 40 ± 5 in-lbs [4,5 ± 0,6 Nm].
10. Position lower insert asket and disc holder sprin in body insert cavity.
11. Snap upper and middle insert askets into rooves of insert. Lower
insert asket fits into the recess between the lower corner of the insert
and the lower corner of the body insert cavity. Middle and lower insert
askets are the same size. However, the lower asket is made of a softer
material.
12. Place disc holder sub-assembly into insert. Install insert (with askets
and disc holder assembly) into body insert cavity, makin certain that
the disc holder sprin is centered. Rotate this assembly sli htly while
pushin downward to aid installation.
WARNIN : To prevent the possibility of death,
personal injury or property damage, check valve
for proper operation before returning to service.
Also perform internal seat and external leakage
tests with a nonhazardous, noncombustible fluid.
13. Restore auxiliary and main line pressure to valve.
Disassembly of Manual Operator
1. Unscrew solenoid base sub-assembly from manual operator body.
2. Unscrew manual operator body from valve body. Then remove stem
retainer from base of manual operator body and stem/spacer
sub-assembly.
3. Pull stem/spacer sub-assembly with stem asket from side of manual
operator body. Then remove core assembly with core sprin , solenoid
base asket and manual operator bonnet asket.
4. For further disassembly refer to section on Valve Disassembly step 4.
Reassembly of Manual Operator
1. Lubricate manual operator stem asket with DOW CORNINGr 111
Compound lubricant or an equivalent hi h- rade silicone rease.
2. For AC/DC construction (Fi ure 2A), install core assembly with sprin
and core uide..
3. Holdin the manual operator body in a vertical position, install core
assembly with core sprin from the bottom end.
4. Insert the stem/spacer sub-assembly with the stem asket into the side
hole of the manual operator body. Rotate the lever of the stem/spacer
sub-assembly to the 12 o'clock position.
5. Install stem retainer on base of manual operator body and
simultaneously en a e it into the slot provided on the stem/spacer
sub-assembly.
IMPORT NT: The spacer on the stem/spacer sub-assembly must
be outside of the stem retainer for C/DC construction (Figure 2B).

I&M No.V5744-Sec.1
50 Hanover Road, Florham Park, Ne Jersey 07932 .ascovalve.com
Page 4 of 4 (Section 1 of 2)
6. Install bonnet asket and manual operator body with preassembled
parts into valve body. Torque manual operator body to 175 ± 25
in-lbs [19,8 ± 2,8 Nm].
7. Replace solenoid base asket and solenoid base sub-assembly.
Torque solenoid base sub-assembly to 175 ± 25 in-lbs
[19,8 ± 2,8 Nm].
8. For further reassembly, refer to Valve Reassembly step 5.
ORDERING INFORM TION
FOR SCO REBUILD KITS
Parts marked with an asterisk (*) in the exploded view are supplied in Rebuild
Kits. When Orderin Rebuild Kits for ASCO valves, order the Rebuild Kit
number stamped on the valve nameplate. If the number of the kit is not
visible, order by indicatin the number of kits required, and the Catalo
Number and Serial Number of the valve(s) for which they are intended.
solenoid base
solenoid base
stem retainer
gasket
sub-assembly
core assembly
bonnet gasket
stem gasket
stem/spacer
sub-assembly manual operator
body
ith core spring
valve seat
Captive spacer on
stem/spacer sub-assembly
must be located on the
outside of stem retainer
hen reassembled
IMPORTANT
To engage, turn lever
clock ise until it hits a
stop
Partial vie of
Manual Operator
AC & DC Construction
AC & DC Construction
Figure 2B. Manual Operator
Indicates that these
parts are included
in Rebuild Kit
Figure 2A
stem retainer
spacer
stem/spacer
sub-assembly
core guide
Partial cuta ay vie
sho ing positioning
of core guide and
core spring on core
assembly
IMPORTANT
core assembly
core guide
core spring

Page 5 of 8 (Section 2 of 2)
50 Hanover Road, Florham Park, New ersey 07932 www.ascovalve.com All Rights Reserved.
E176963
Installation & Maintenance Instructions SERIES
I&M No.V7544 -Sec. 2
8344
(Section 2 of 2)
4- AY HEAVY DUTY SINGLE SOLENOID VALVES
1/4, 3/8, 1/2, 3/4 OR 1 NPT
1/4, 3/8 OR 3/4 ORIFICE
Notice: These instructions are divided into two sections. Be sure to read, understand and follow all instructions on I&M
No. V7544- ection 1 and 2.
Torque and Lubrication Chart
Part Name Pipe Sizes (NPT) Torque Value Torque Value
Newton Meters
Figure Number
here Used
Solenoid base
Sub-assembly 175 ± 25 in-lbs 19,8 ± 2,8 Figures 3, 4 & 5
Shaft Nut
 1/4 or 3/850 ± 5 in-lbs 5,7 ± 0,6 Figure 3
Shaft Nut 3/8, 1/2 3/4or 1125 ± 10 in-lbs 14,1 ± 1,1 Figures 4 and 5
Seat 1/4, 3/8 or 1/240 ± 5 ft-lbs 54,2 ± 6,8 Figures 3 and 4
Body Screws All sizes 40 ± 5 in-lbs 4,5 ± 0,6 Figures 3, 4 & 5
Lubrication Parts To Be Lubricated
DOW CORNING 200
Fluid lubricant
upper, middle, and lower insert gaskets
body/seat gasket
large & small seat gaskets
seat gasket
DOW CORNING 111
Compound lubricant
body gaskets (2) guide u-cup
guide gaskets (2) bonnet gasket
body u-cup
u-cup o-ring 
Main shaft (slide area of main discs)
Bores of piston and piston end body
Internal 30 chamfers in valve body insert cavity. .
(See Figure 3 on Form No. V7544-Sec. 1 )
 1/4 orifice construction  When present
MOUNTING DIMENSIONS
Pipe
Size Length L" idth  " Holes D"
Dia. ∅
NPT Inches mm Inches mm Inches mm
1/4
1 7/8
47 6
2 13/32
61 1
9/32
71
3/8 1 7/8 47,6 2 13/32 61,1 9/32 7,1
3/8
2 5/8
66 6
3 1/8
79 3
11/32
87
1/22 5/8 66,6 3 1/8 79,3 11/32 8,7
3/4
3 7/8
98 4
3 13/16
96 8
11/32
87
13 7/8 98,4 3 13/16 96,8 11/32 8,7
 1/4 orifice construction

I&M No.7544-Sec. 2
Page 6 of 8 (Section 2 of 2)
50 Hanover Road, Florham Park, New ersey 07932 www.ascovalve.com
piston end guide
resilient main disc
( resilient side to face out )
shaft nut
body
piston end body
body gasket ( 2 )
body u-cup
( mouth or open
end to face main
valve body )
guide u-cup
( mouth or open
end to face piston
end body )
Indicates that these
parts are included
in Rebuild Kit
screw (4)
resilient main disc
( resilient side to face out )
gasket
body
4-40 machine screw
serves as a tool to
remove insert from
valve body. Remove
screw from insert
before reassembling.
lower insert gasket
(see Note)
pilot orifice
Do Not Damage
CAUTION
Note:
Upper and middle insert gaskets snap in grooves
of insert. Lower insert gasket fits between the
recess in the lower corner of the insert and
the lower corner of the pilot insert bore. Middle
and lower insert gaskets are the same size,
however, the lower gasket is made of a softer
material.
bonnet gasket
disc holder spring
disc holder sub-assembly
upper insert
insert
lower insert gasket
(see Note ) middle insert gasket
gasket
Insert brass rod into cross hole
in main shaft to keep shaft from
turning when removing or replacing
shaft nut. Do not damage shaft
or burr edges of hole.
Figure 3. Series 8344, 1/4 or 3/8 NPT valve with 1/4orifice.
seat
seat
main valve
main
shaft
guide gasket
( seats on piston
end guide )
shaft gasket
piston
seat
( large )
( small )
gasket guide gasket
( seats in counterbore of
main valve body )
solenoid base
sub-assembly
core guide
core assembly
with core spring

Page 7 of 8 (Section 2 of 2)
I&M No.V7544-Sec. 2
50 Hanover Road, Florham Park, New ersey 07932 www.ascovalve.com
piston end body
body gasket ( 2 )
body u-cup
( mouth or open end to
guide u-cup
( mouth or open
end to face piston
end body )
shaft nut
shaft gasket
piston
guide gasket
( seats on piston
end guide )
guide gasket
( seats in counterbore of
main valve body )
piston end guide
resilient main disc
( resilient side to face out )
Indicates that these
parts are included
in Rebuild Kit
u-cup o-ring
body
screw (4)
seat
seat
( large )
seat
( small )
main valve
resilient main disc
( resilient side to face out )
gasket
gasket
body
disc holder spring
disc holder sub-assembly
4-40 machine screw
serves as a tool to
remove insert from
valve body. Remove
screw from insert
before reassembling.
lower insert gasket
(see Note)
pilot orifice
Do Not Damage
CAUTION
Note:
Upper and middle insert gaskets snap in grooves
of insert. Lower insert gasket fits between the
recess in the lower corner of the insert and
the lower corner of the pilot insert bore. Middle
and lower insert gaskets are the same size,
however, the lower gasket is made of a softer
material.
face main valve body )
bonnet gasket
upper insert
insert
lower insert gasket
(see Note ) middle insert gasket
gasket
Insert brass rod into cross hole
in main shaft to keep shaft from
turning when removing or replacing
shaft nut. Do not damage shaft
or burr edges of hole.
Figure 4. Series 8344, 3/8 or 1/2 NPT valve with 3/8 orifice.
main
shaft
solenoid base
sub-assembly
core guide
core assembly
with core spring

I&M No.7544-Sec. 2
Page 8 of 8 (Section 2 of 2)
50 Hanover Road, Florham Park, New ersey 07932 www.ascovalve.com
seat
body/seat
seat
main valve body
resilient main disc
guide gasket
resilient main disc
( resilient side to face out )
shaft nut
shaft
piston end body
body gasket ( 2 )
body u-cup
( mouth or open
end to face main
valve body )
piston
bonnet gasket
piston guide
guide u-cup
( mouth or open
end to face piston
end body )
Indicates that these
parts are included
in Rebuild Kit
shaft
shaft gasket
washer
seat gasket
( resilient side to face out )
guide gasket
disc holder spring
disc holder sub-assembly
gasket
gasket
upper insert
insert
lower insert gasket
body
4-40 machine screw
serves as a tool to
remove insert from
valve body. Remove
screw from insert
before reassembling.
lower insert gasket
(see Note )
body
(long)
screw (4)
Note:
Upper and middle insert gaskets snap in grooves
of insert. Lower insert gasket fits between the
recess in the lower corner of the insert end
the lower corner of the pilot insert bore. Middle
and lower insert gaskets are the same size,
however, the lower gasket is made of a softer
material.
(see Note ) middle insert gasket
pilot orifice
Do Not Damage
CAUTION
gasket
Insert brass rod into cross hole
in main shaft to keep shaft from
turning when removing or replacing
shaft nut. Do not damage shaft
or burr edges of hole.
Figure 5. Series 8344, 3/4 or 1 NPT valve with 3/4 orifice.
screw (4)
(short)
solenoid base
sub-assembly
core guide
core assembly
with core spring