H4 Series Valves
V-408CP
2
Field Conversions
These valves can be converted in the field from internal pilot
supply to external pilot supply or from single pressure to dual
pressure - highest pressure at port #5 (40 psig minimum).
These conversions are easily accomplished by changing the
body to base gasket. In the 3-position valve, the effect of dual
pressure is extremely important when the valve is in the center
position. Therefore care should be used when selecting the
proper 3-position valve configuration.
To obtain the desired configuration, replace the standard gasket
with the appropriate gasket from the following chart:
!
CAUTION: When installing gaskets, always orient
gasket as indicated on the gasket.
External pilot supply conversion
(single or dual pressure valves):
Model
Gasket Part Number
Number
Solenoid Operators
Air Operators
H4
P00149
P00151
Dual pressure conversion
(highest pressure at port #5 - internal pilot supply):
Model
Gasket Part Number
Number
Solenoid Operators
Single Air Operator
(2-Position Valve only)
H4
P00153
P00158
Symbols
(Single pressure models are shown.)
4
2
5
3
1
Sol.
14
Single Solenoid - Air Return
2-Position, 4-Way
Single Air Operator - Air Return
2-Position, 4-Way
Double Solenoid
2-Position, 4-Way
Double Air Operator
2-Position, 4-Way
4
2
5
3
1
#14
End
#12
End
#12
End
4
2
5
3
1
#14
End
#12
End
4
2
5
3
1
Sol.
14
Sol.
12
Sol.
14
Sol.
12
Sol.
14
Sol.
12
Sol.
14
Sol.
12
4
2
5
3
1
Double Air Operator 3-Position, 4-Way
All Ports Blocked *
Double Solenoid 3-Position, 4-Way
All Ports Blocked *
Double Air Operator 3-Position, 4-Way
Cylinder Ports Open to Exhaust *
Double Solenoid 3-Position, 4-Way
Cylinder Ports Open to Exhaust *
Double Air Operator 3-Position, 4-Way
Cylinder Ports Open to Pressure *
Double Solenoid 3-Position, 4-Way
Cylinder Ports Open to Pressure *
* Condition with spool in center position.
#14
End
#12
End
4
2
5
3
1
#14
End
#12
End
4
2
5
3
1
#14
End
#12
End
4
2
5
3
1
4
2
5
3
1
4
2
5
3
1
Maintenance & Troubleshooting Hints
Valve Not Shifting Completely When Energized:
1. Check to insure that the proper voltage is supplied to the
solenoids.
2. Check to insure that supply pressure is 280 kPa (40 psig)
or greater at the valve’s inlet when shifting valve.
3. Check for possible restrictions in air supply, such as
undersized hoses, fittings, or quick disconnects.
4. Check to insure that the spool moves smoothly.
5. Check spool seals for proper installation, dirt, or damage.
Air Leakage Through Exhaust Ports:
1. Check for internal leakage in the cylinder being operated
by the valve.
2. Check condition of the spool seals for proper alignment,
damaged (nicked or broken) seals and dirt contamination.
3. Inspect the solenoid plunger guide, plunger, spring, and
seat (as well as their mating parts) for dirt, nicks, or damage.
4. Check for missing, damaged, or incorrectly assembled
o-rings and gaskets.
Noisy Solenoids:
1. Check to insure that voltage and pressure supplies are
adequate.
2. Inspect the plunger guide, plunger, spring, and seat (as
well as their mating parts) for dirt, nicks, or damage.
3. Replace worn or damaged parts. Reassemble and retest
unit.
If you have questions concerning how to service this unit,
contact your local authorized dealer or your customer service
representative.
Service Kits Available
Valve Body Service Kit - 2-Position
Single Solenoid and Single Air Operator:
PS1401P
(consists of item #s 1, 2, 4,10, 14, 15, 24, 26, 29)
Double Solenoid and Double Air Operator: PS1402P
(consists of item #s 10, 14, 15, 24, 26, 29)
Valve Body Service Kit - 3-Position
Double Solenoid and Double Air Operators:PS1438P
(consists of item #s 10, 14, 15, 24, 26, 29, 31)
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