Norgren P74F Installation Instructions

Port

3....3/8"

4....1/2"

6....3/4"

Thread Form

A....PTF

B....ISO Rc taper

G....ISO G parallel

Operator

A....Air pilot

B....Air pilot plus lockout

C....22 mm solenoid

D....22 mm solenoid plus lockout

L....CNOMO solenoid

M...CNOMO solenoid plus lockout

P74F - HHH - HHH

Solenoid Override

P....Non-locking,

shrouded
push button

N....None

Solenoid Operator

A .......110/120 50/60 Hz .......4/2,5 VA

B .......220/240 50/60 Hz .......4/2,5 VA

D.......6 Vdc.............................2W

E .......12 Vdc...........................2W

F .......24 Vdc...........................2W

Z .......No coil

N.......No Solenoid

Installation & Maintenance

Watts Voltage

P74F Soft Start Valve

Instructions

Connector

A....Cable grip

B....Cable grip with indicator

lights

N....No connector

TECHNICAL DATA

Valve type: 3-way, normally closed, soft start with optional

lockout slide
Fluid: Filtered and lubricated compressed air
Main valve maximum inlet pressure: 17 bar (250 psig) but

must not exceed the solenoid rating when solenoid

operator is used
Minimum inlet pressure: 3 bar (44 psig)
Operating temperature*: -20° to +80°C (0 to175°F) but

must not exceed the solenoid rating when solenoid

operator is used

* Air supply must be dry enough to avoid ice formation at

temperatures below 35°F (2°C).

Air operator pilot supply inlet pressure range: Equal to or

greater than the main valve inlet pressure, but not less

than 3 bar (44 psig) and not greater than 17 bar (250

psig).
Maximum flow with 6,3 bar (90 psig) inlet pressure and a

pressure drop of 0,5 bar (7 psig): 57 dm
Average flow factor (Cv) –

IN to OUT Port: 4,4

OUT to EXHAUST Port: 5,6
Snap pressure: Full flow when downstream pressure

reaches 50 to 80% of inlet pressure.
Adjustable charge time for 2 litre (2 U.S. quart)

downstream volume at 6.3 bar (90 psig) inlet pressure:

0,2 seconds minimum to 76 seconds maximum
Pilot port on air operated regulators:

Rc 1/4 with ISO main ports

1/4 PTF with PTF main ports
Exhaust port:

G 1/2 with ISO main ports

1/2 PTF with PTF main ports
Maximum diameter of customer supplied padlock shackle:

5/16" (8 mm)
Materials –

Main body: Aluminum

Intermediate body: Aluminum

Top plate: Zinc

Exhaust bonnet: Zinc

Internal components: Brass/steel

Filter discs: Sintered plastic

Elastomers: Nitrile

3

/s (120 scfm)

OPERATION

Normally closed, 3-way valves block inlet air and
exhaust downstream air when the solenoid is de-energized.
Air flow from the inlet port to the outlet port occurs when
the solenoid is energized.

The soft start function reduces the rate of downstream
pressure buildup at system start up. Cylinders and other air
operated devices are eased into normal starting positions,
reducing the possibility of equipment damage and hazards
to the user.

When the optional manually operated lockout slide is
closed (pushed in) pilot air is exhausted, the valve returns
to the non-energized (closed) position, and downstream air
is exhausted. The lockout slide can be locked in the closed
position with a customer supplied padlock.

Solenoid operated valves can be actuated and
deactuated manually when the solenoid is de-energized and
the lockout slide is pulled out by depressing the manual
override. Depress override to actuate the valve. Release
override to deactivate valve.

INSTALLATION

1. Shut off air pressure. Make sure pressure upstream and

downstream of the valve has been reduced to zero.
Install valve in air line -

l with air flow in direction of arrow on body,
l upstream of the air circuit requiring protection,

l with sufficient clearance to remove parts for service.

2. Connect piping to proper ports using pipe thread sealant

on male threads only. Do not allow sealant to enter
interior of valve.

3. Install a muffler in the exhaust port. Order Norgren

muffler MB004B for valves with a R1/2 exhaust port or
MB004A for valves with a 1/2 PTF exhaust port. Exhaust
can also be piped away. Install pipe work at a downward
angle from the valve to provide drainage.

4. Any electrical connections must be made by a

competent, licensed electrician.

5. Install a compressed air filter and lubricator immediately

upstream of the valve. Install lubricator between the
filter and valve. Lubricator should be capable of
atomizing oil at low as well as high air flow. See
Norgren Publication N/AL.8.900.935 for recommended
lubricants.

Adjustment

1. The time required to reach full pressure is dependent on

the downstream system volume. Units shipped from
factory are set to give maximum delay.

2. To adjust time delay:

a. Turn on system air supply prior to

applying pilot signal to operator.
Failure to do so may cause valve
to continuously exhaust.

b. Actuate the solenoid (press and

hold solenoid override if your
solenoid is so equipped), or apply
the air pilot signal on air pilot

operators.
c. Remove tamper resistant plug (1).
d. Use a 3 mm allen key to turn

adjusting screw (54)

clockwise to increase and counterclockwise to

decrease time delay.
c. Reinstall tamper resistant plug (1).

MAINTENANCE

The P74F valve is not field repairable, and must be returned
to the factory for repair in case of malfunction. Do not
attempt to disassemble or repair the P74F valve in the field.

WARNING

These products are intended for use in industrial
compressed air systems only. Do not use these products
where pressures and temperatures can exceed those listed
under Technical Data.

The user of these products is cautioned to conform to
all applicable electrical, mechanical, and other codes in the
installation and operation of these products.

Through misuse, wear or malfunction, these products
can fail in modes which can simultaneously pressurize all
ports to the highest applied pressure level. They can also
fail to shift as expected upon the application or removal of
operator signals. The system designer is warned to
consider the failure modes of all component parts used in
the system, and to provide adequate safeguards to prevent
personal injury or damage to equipment in the event of
such failures. System designers must provide a warning to
end users in the system instructional manual if protection
against a failure mode cannot be adequately provided.

The P74F valve must be returned to the factory for
repair in case of malfunction.

Do not use these valves to control a power press clutch
or brake.

Before using these products with fluids other than air,
for nonindustrial applications, or for life-support systems
consult Norgren.

© Norgren 2000

IM-200.610

Supersedes 9/00

(10/00)