Transcript Слайд 1 - VLZ.RU

HYDRAULIC HOSES
Nowadays almost all road-building, municipal
and other Russian and foreign vehicles have
hydraulic transmission.
Hydraulic transmission break down rarely, but
from time to time it is necessary to change
the old details, including hydraulic hoses.
We would like to tell about the possibility to
replace the foreign hoses to Russian ones.
Nowadays Russian specialists use foreign
hydraulic transmission, but the European
standards are not so much known. It is more
convenient to use Russian hoses.
There are 2 types of hydraulic hoses used
in industry: skive hoses and spiral
hoses.
Skive hoses are used in hydraulic
transmissions with high pressure – till
25 megapascals and with small radius
of flexure.
Spiral hoses are used in hydraulic
transmissions with the pressure of 3040 megapascals and with constant
cycle charge.
The European standards for skive hoses
are DIN EN 853 and DIN EN 857, and
they are almost similar to Russian
GOST 6286. These standards are for
the hoses which work with hydraulic
mineral oils, engine propellant with
temperatures from -40 to +100 C, and
also for water and oil emulsion with
temperatures from -40 to +70 C.
These requirements are convenient to
Russian hydraulic hoses.
There are 4 types of hoses DIN EN
853:
1SN and 2ST – skive hoses
1SN and 2SN – the same
construction, but thinner external
rubber layer. This permits to
armour the hoses without
preparatory cleaning of external
rubber layer.
The essential difference between
foreign and Russian hoses is DN,
which is fixed in inches. It is not
always the same as Russian. For
instance, the diameter of foreign
hose with DN12 is 12,7 mm, which
is larger than Russian one. At the
same time DN10 and DN12 are
9,5 mm and 19 mm and they can
allow 11% less liquid than Russian
ones.
The testing of Russian hoses on leak resistance and rupture (megapascals):
DN
Max pressure
Leak resistance
pressure
Rupture pressure
1ST and
1SN
2ST and
2SN
1ST and
1SN
2 ST and
2SN
1ST and
1SN
2ST and
2SN
5
250
415
500
830
1000
1650
8
225
400
450
800
900
1600
8
215
350
430
700
850
1400
10
180
330
360
660
720
1320
12
160
275
320
550
640
1100
16
130
250
260
500
520
1000
19
105
215
210
430
420
850
25
88
165
175
325
350
650
31
63
125
150
250
250
500
38
50
90
100
180
200
360
51
40
80
80
160
160
32
The marking of the hoses DIN EN 853 is the following:
- Producer
- Type
- Caliber (in inches)
- Standard
- Nominal diameter
- The last 2 figures of the producing year
The pressure is not marked, it is determined in the schedule. There are
2 types of DIN EN 857 hoses: 1SC and 2SC. Their characteristics
are the same as DIN EN 853, but the bend radius is 40% less.
There are 4 types of spiral hoses DIN EN 856:
- Type 4SP – 4-spiral skive hoses for middle-level pressure
- Type 4SH – 4-spiral skive hoses for high pressure
-
Type R12 – 4-spiral hose for long work with high temperature and middle-level pressure
Type R13 – 6-spiral hose for the most hard and long work with very high pressure. Its
production is limited.
ND
Max pressure
Leak resistance pressure,
bar
Rupture pressure, bar
4SP
4SH
R12
R13
4SP
4SH
R12
R13
4SP
4SH
R12
R13
16
350
-
276
-
700
-
552
-
1400
-
1104
-
19
350
420
276
345
700
840
552
690
1400
1680
1104
1380
25
280
380
276
345
560
760
552
690
1120
1520
1104
1380
31
210
325
207
345
420
650
414
690
840
1300
828
1380
38
185
290
172
345
370
580
344
690
740
1160
688
1380
51
165
250
172
345
330
500
344
690
660
1000
688
1380
ND, mm
Min bend radius, mm
4SP
4SH
R12
R13
6
150
-
-
-
10
180
-
130
-
12
230
-
180
-
16
250
-
200
-
19
300
280
240
240
25
340
340
300
300
31
460
460
420
420
38
560
560
500
500
51
660
700
630
830
DIN EN 856 have min temperature -40C
The characteristics of type 4SP:
Nominal inside
diameter
Rupture pressure, bar
Pressure
according GOST
The number of
cycles with Rmin
GOST
EN 856
10
1400
1780
340
1000000
12
1360
1660
340
1000000
16
1360
1400
300
800000
19
1200
1400
250
800000
25
1000
1120
250
800000
The hydraulic hoses satisfy the requirements of the customers and can be used
both in Russian and foreign machines. The quality and technical control is
made during all periods of production. Then the hoses are tested on the testing
stand.