Norgren T74 Installation Instructions

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.

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

TECHNICAL DATA

Fluid: Compressed air
Maximum pressure: 17 bar (250 psig)
Operating temperature*: -20° to 65°C (0° to 150°F)
* Air supply must be dry enough to avoid ice formation at

temperatures below +2°C (+35°F).

Cv factor:

IN to OUT ports:

3/8" ports: 7,1
1/2" ports: 8,1
3/4" ports: 7,7

OUT to EXHAUST ports on 3-port/2-position valves: 0,2

Exhaust port threads on T74H and T74T valves:

1/8 PTF with PTF main ports
Rc1/8 with ISO G and ISO Rc main ports

Materials:

Body: Zinc
Slide: Acetal plastic
Elastomers: Nitrile

SERVICE KITS

Contain items circled on exploded view

T74B (Black slide) ..............................................4384-711

T74E (Yellow slide).............................................4384-710

T74H (Red slide) ................................................4384-712

T74T (Red slide).................................................4384-713

INSTALLATION

1. Install valve in air line with air flow in direction of arrow
on body. Use pipe thread sealant on male threads only.
Do not allow sealant to enter interior of valve.

2. The slide on the T74B, T74E, and T74T can be locked in
the closed position only. The slide on T74H can be
locked in the open or closed positions. If desired, install
a customer supplied padlock in the 7.5mm (0.29")
diameter hole in the slide.

DISASSEMBLY

1. Shut off inlet pressure. Reduce pressure in inlet and
outlet lines to zero.

2. Remove the valve from the air line. Disassemble in
general accordance with the item numbers on exploded
view.

CLEANING

1. Clean all parts with warm water and soap.

2. Dry and inspect parts. Replace parts found to be
damaged.

REASSEMBLY

1. Lubricate o-rings and center area of both sides of slide
(4) with o-ring grease. Assemble valve as shown on the
exploded view. The blade (4) on The T74E, T74H, and
T74T valves must be installed with the slotted exhaust
hole facing the outlet port. The T74E valve uses o-ring
(3) in the inlet and outlet bodies. The T74B, T74H, and
T74T valves use o-ring (3) in the inlet body, and seal
(3A) in the outlet body.

2. Torque Table
Item Torque in N-m (Pounds-Inch)
1 (Screw) 5,7 to 6,3 (50 to 55)

IM-200.600

(4/98)

© Norgren 1998

T74

Installation & Maintenance

Instructions

Shut-off & Lockout Valves

T74★ - ★★A- P1★

Thread Form

A....PTF

B....ISO Rc taper

G....ISO G parallel

Type

B....2-Port/2-position shutoff valve, black slide, padlocks in closed position only

E....3-Port/2-position lockout valve, yellow slide, unthreaded exhaust outlet, padlocks in closed position only

H....3-Port/2-position shutoff valve, red slide, threaded exhaust port, padlocks in open or closed position

T....3-Port/2-position shutoff valve, red slide, threaded exhaust port, padlocks in closed position only

Port

3....3/8"

4....1/2"

6....3/4"

Options

N....None

S....T74T with exhaust silencer

3

3A

O

P

E

N

CLOSED

2

1

2

4

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