Norgren P74F Datasheet
See Section ALE-24 for Accessories
Littleton, CO USA Phone 303-794-2611 www.norgren.com
P74F
● Excelon design allows in-line or modular installation
● Controls increase of downstream pressure on
start up. Cylinders and other air operated devices are
eased into normal operating positions, reducing the
possibility of equipment damage and hazards to the
user.
● 3 port/2 position, normally closed, soft start valve
with optional manual lockout slide
● Blocks inlet air and exhausts downstream air when
pilot signal is removed or when the optional manual
lockout slide is closed
● Optional manual slide can be padlocked in closed
position
● Solenoid pilot or air pilot operation
● Designed primarily for use in start-up and shutdown
of equipment, not as a frequently cycling directional
control valve. Norgren offers a wide variety of valves
designed for frequent cycling and other applications.
Please refer to the P72C and P74C valves, and to
other Norgren valve catalogs.
Excelon 74 Smooth Start/Exhaust Valve
3/8", 1/2", 3/4" Port Size
ALE-17-8
ISO Symbols
Solenoid operated
Air pilot
P 7 4-F
★ ★
-
★★ ★ ★
Solenoid Operator Substitute
Shrouded push button P
Screw driver slot**** S
None N
Connectors Substitute
3 pin plug with cable gland, A
no indicator light
Cable grip w/indicator light † B
1/2” Conduit C
Without N
** To order air pilot models also substitute ‘NNN’at digits 8, 9 and 10 e.g.P74F-4AA-NNN.
**** Not available with D or M operator.
† Use with A and F coils only.
Alternative Models
Coil Voltage Nominal Substitute
Power Rating
24 V d.c. 2 W F
12 V d.c. 2 W E
6 V d.c. 2 W D
220/240 V 4/2.5 VA B
50/60 Hz
110/120 V 4/2.5 VA A
50/60 Hz
No coil 2 W Z
No solenoid N
Port Size Substitute
3/8" 3
1/2" 4
3/4" 6
Threads Substitute
PTF A
ISO Rc taper B
ISO G parallel G
Operator Substitute
Air pilot** A
Air pilot with manual lockout slide** B
22 mm miniature solenoid C
22 mm miniature solenoid with
manual lockout slide D
CNOMO solenoid L
CNOMO solenoid with
manual lockout slide M
Port Size Solenoid Operated* Weight Air Pilot Operated Weight
Model lb (kg) Model lb (kg)
3⁄8" P74F-3AC-PFA 2.4 (1.08) P74F-3AA-NNN 2.3 (1.05)
1⁄2" P74F-4AC-PFA 2.3 (1.05) P74F-4AA-NNN 2.2 (1.02)
3⁄4" P74F-6AC-PFA 3.1 (1.41) P74F-6AA-NNN 3.0 (1.35)
* To select other solenoid type and coil voltage refer to alternative models table below.
Ordering Information.Models listed are with PTF ports.Solenoid operated models include 24 V d.c.coil and plug without indicator.
P74F Smooth Start/Exhaust Valve
Littleton, CO USA Phone 303-794-2611 www.norgren.com
ALE-17-9
All Dimensions in Inches (mm)
Technical Data
System air supply:Turn on system air supply prior to applying pilot signal to operator.
Failure to do so may cause valve to continuously exhaust.
Fluid: Compressed air
Maximum pressure solenoid operated:
Dependant on solenoid rating
[must not exceed 250 psig (17 bar)]
Maximum pressure pilot operated: 250 psig (17 bar) max.
Minimum operating pressure: 44 psig (3 bar)
Operating temperature solenoid operated:
Dependant on solenoid rating
[must be within range 0°* to 175°F (-20°* to 80°C)]
Operating temperature pilot operated:
0°* to 175°F (-20°* to 80°C)
* Air supply must be dry enough to avoid ice formation at temperatures below 35°F (2°C).
Air pilot port:
ISO Rc1/4 with ISO Rc main ports
ISO Rc1/4 with ISO G main ports
1/4” PTF with PTF main ports
Exhaust port:
ISO G1/2 with ISO G main ports
ISO G1/2 with ISO Rc main ports
1/2” PTF with PTF main ports
Typical flow with 90 psig (6.3 bar) inlet pressure and pressure drop of 7 psig (0.5 bar):
57 dm
3
/s (P1to P2= Cv 4.4) (P2to P3= Cv 5.6)
Snap pressure:
Full flow when downstream pressure reaches 50 – 80% of inlet pressure
Charge time:
For 2 liter downstream volume and 90 psig (6.3 bar) inlet pressure:
0.2 sec. minimum
76 sec. maximum
Materials
Body: Aluminium
Intermediate body: Aluminium
Elastomers: Synthetic materials
Filter discs: Sintered plastic
Internal components: Brass/steel
Top plate: Zinc
Exhaust bonnet: Zinc
Typical Performance Characteristics
Solenoid operated
Solenoid operated plus
manual shut-off with lockout
Air pilot operated
Air pilot operated plus
manual shut-off with lockout
FLOW CHARACTERISTICS
PORT SIZE: 1/2"
psid
bar d
0.8
10
0.6
8
6
0.4
PRESSURE DROP
4
0.2
2
0
0
0 40 80 120 160 200 240 scfm
0 20 40 60 80 100 dm3/s
psig
bar g
16
200
12
160
120
8
OUTLET PRESSURE
80
4
40
0
0
0 20 40 60 80 100 120
INLET PRESSURE: psig (bar g)
44
(3)
PERCENTAGE SNAP POINT
SNAP POINT
91
58
116
(6.3)
(4.0)
CHARGE TIME - (S)
(8)
AIR FLOW
2 quart (2 liter) downstream volume
150
(10)
1.46 (37)
3.31 (84)
4.37 (111) max.
1/2 PTF (G1/2)
1.18 (30) A/F
6.50 (165)
3.78 (96) min.
8.70 (221)
1.46 (37)
3.31 (84)
4.37 (111) max.
1/2 PTF (G1/2)
1.18 (30) A/F
4.21 (107)
1/4 PTF (Rc1/4)
3.78 (96) min.
6.38 (162)
3.31 (84)
1.46 (37)
2.91 (74)
1/2 PTF (G1/2)
1.18 (30) A/F
6.14 (156)
8.35 (212)
3.31 (84)
1.46 (37)
2.91 (74)
1/2 PTF (G1/2)
1.18 (30) A/F
5.67 (144)
3.46 (88)
1/4 PTF (Rc1/4)
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