Page 430 - 4300 Catalog Cover.pdf

4300 Catalog

Assembly / Installation

Parker Hannifin Corporation

Tube Fittings Division

Columbus, Ohio

http://www.parker.com/tfd

T20

Triple-Lok/Triple-Lok 2

Assembly

For leak-free performance, the Triple-Lok fitting requires the

following steps:

1. Cutting, deburring and cleaning of the tube

2. Flaring

3. Flare inspection

4. Installation

Caution:

Use only seamless or welded and drawn tube

that is fully annealed for flaring and bending. (See page

U14 for tube/fitting material compatibility information.)

Step 1 has been covered in a previous section (se

e

page T12

).

For the recommended minimum and maximum tube wall thick-

ness for Triple-Lok fittings, please refer to

Table C3

on page

C8.

Flaring

Several flaring methods, ranging from simple hand flaring to

hydraulic/electric power flaring, are available. Various tools for

flaring are shown on

pages S27

t

hroug

h

S32

. P

ower flaring

is quicker and produces more accurate and consistent flares

compared to hand flaring. Therefore, it is a preferred method of

flaring. Hand flaring should be limited to places where power

flaring tools are not readily available. The Parflange machines

shown o

n

pages S24-S25

a

lso flare tube with an orbital flaring

process and provide the best flare for stainless steel tube.

Prior to flaring, determine the tube length allowance usingTable

T17.This tube length allowance should be added to the cut tube

length to allow for the “loss” of tube caused by flaring.

Fig. T27 – Nuts and sleeves

assembled before flaring

Fig. T26 – Flaring with Hydra-

Tool

Flare tube end using one of the flaring tools and following its

operating instruction

s.

Fig. T26

s

hows flaring with Hydra-Tool.

Note:

Be sure to insert a nut and a sleeve in proper se-

quence and orientation before flaring either end of a bent

tube, or second end of a straight tube (se

e

Fig. T27

).

Flare Inspection

Inspect flare for dimensions and surfacequality. TableT18 shows

the proper flare dimensions. The sleeve can also be used for a

quick check of the flare dimensions as shown i

n

Fig. T28

.

Fig. T28 – Comparing flare O.D. with sleeve seat and O.D.

Underflaring

(see

Fig. T29

)

reduces contact area causing ex-

cessive nose collapse and leakage; or, in extreme cases, tube

pull out under pressure.

Overflaring

(se

e

Fig.T29

)

causes tube nut thread interference,

either preventing assembly altogether, or giving a false sense

of joint tightness resulting in leakage.

Table T17 —Tube

length allowance

Fig. T25 —Tube length allow-

ance

Triple-Lok Assembly

Nominal Tube

O.D.

A

Inch Metric

1/8

—

0.07

3/16

—

0.08

1/4

6

0.09

5/16

8

0.08

3/8

10

0.08

1/2

12

0.12

5/8 14, 15, 16

0.13

3/4 18, 20

0.15

7/8

22

0.15

1

25

0.15

1 1/4 30, 32

0.20

1 1/2 38

0.18

2

42

0.28

Table T18 — 37° Flare Dimensions

Inch

Tube O.D.

(in.)

Metric

Tube O.D.

(mm)

37° Flare

Diameter ØA

(in.)

1/4

6

.340/.360

5/16

8

.400/.430

3/8

10

.460/.490

1/2

12

.630/.660

5/8 15 & 16 .760/.790

3/4 18 & 20 .920/.950

1

25 1.170/1.200

1 1/4 30 & 32 1.480/1.510

1 1/2

38 1.700/1.730