Directional Control Valves 20ST(F)(B) – 4-way
Rev. 2/1001 2.11.1
HYDRANOR
DIRECTIONAL CONTROL VALVES 20ST(F)(B) – 4-WAY
GENERAL DESCRIPTION
Figure 1 20ST General Arrangement
The Directional Control Valves 20ST(B) 4-ways are seawater resistant valves for smooth
distribution and stopping of flow in hydraulic systems. The valves have the following
characteristics:
Delivered with threaded connections, SAE flanges or for gasket mounting to a sub
plate or valve unit.
Proportional remotely controlled by hydraulic pilot pressure.
Manual override by the hand lever.
Delivered with flow capacity up to 700 l/min.
Six standard spools with throttling grooves for smooth start and stop are available.
Most of the hand lever operated directional control valves can be equipped with the
Brake Release Valve BA3/BA4. For description of the Brake Release Valves, please
refer to separate manual.
For more details about types and options, please refer to section ’Modular Code’.
Directional Control Valves 20ST(F)(B) – 4-way
Rev. 2/1001 2.11.2
HYDRANOR
MODULAR CODE
Options
Remarks
Design Code
Fill in
Mounting
20ST
Threads
Flange
SAE 6000, Note1
F
SUB Plate
B
Type
4-ways
No options
4
4
Pressure
350 bar
No options
4
4
Operation
Manual/ Proportional Remote
7
Size
20 mm
200 l/min
4
25 mm
300 l/min
5
30 mm
450 l/min
6
40 mm
700 l/min
8
A
TP
BA
0 B
01
02
03
07
2C
Spring / Detents Positions
A 0 B
Spring centred
1.
1.
Remote control pressure
8-30 bar
8-45 bar (recommended for spool -01)
2AC
In example a 20ST valve with sub plate, 300 l/min flow, spool type 06 and remote control
pressure 8-45 bar will have modular code: 20STB44752C061.2AC.
Note1: For 20STF SAE 3000 flanges to be delivered upon request.
Directional Control Valves 20ST(F)(B) – 4-way
Rev. 2/1001 2.11.3
HYDRANOR
DIMENSIONS
P T
A B
L
Figure 2 20ST Dimensions
Common dimensions for 20ST, 20STF and 20STB:
Size [mm]
C
D
F
G
H
J
K
N
Z
Y
20
419
336
95
33
126
79.5
8.5
158
13
35
25
437
350
118
33
126
91
20
176
13
35
30
578
425
128
52
167
109
14
234
17
37
40*
785
424
175
58
232
137.5
22.5
328
17
33
*Some of the dimensions varies for the models B, E, D and F.
20ST:
Size [mm]
A1
A2
B1
B2
L1
P1
T1
Q
Q1
S
S1
20
55
32.5
103
62.5
172
79
127
25
83.5
133
11.5
25
55
40
107
78
190
81
133
25
104
156
14
30
85
56
155
72
254
120
190
50
110
197
18
Directional Control Valves 20ST(F)(B) – 4-way
Rev. 2/1001 2.11.4
HYDRANOR
P T
A B
L
Figure 3 20STF Dimensions
20STF:
Size [mm]
A1
A2
B1
B2
L1
P1
T1
Q
Q1
S
S1
30
80.5
49
159.5
79
254
111
190
50
110
197
18
40
114
77.5
214
97.5
348
164
264
60
141.5
268
33.5
Directional Control Valves 20ST(F)(B) – 4-way
Rev. 2/1001 2.11.5
HYDRANOR
A B
P T
L
Figure 4 20STB Dimensions
20STB:
Size
[mm]
A1
A2
B1
B2
L1
P1
P2
T1
Q
Q1
U
S
S1
20
55
73.5
103
144.5
47.5
79
21.5
127
25
83.5
103
133
11.5
25
55
85
107
150.5
59
81
33
133
25
104
107
139
14
30
85
96
155
223
64
120
32
190
50
110
155
197
18
40
114
137.5
214
313
87.5
164
37.5
264
60
159
264
302
16
Directional Control Valves 20ST(F)(B) – 4-way
Rev. 2/1001 2.11.6
HYDRANOR
PRESSURE DROP
PRESSURE DROP 20ST(B)44*4**
Measured at vicosity 68 cSt
0
1
2
3
4
5
6
7
8
9
10
0 20 40 60 80 100 120 140 160 180 200
Flow [l/min]
Δp [bar]
P-A/P-B/B-T
P-T
A-T
PRESSURE DROP 20ST(B)44*5**
Measured at vicosity 68 cSt
0
1
2
3
4
5
6
7
8
9
10
11
0 25 50 75 100 125 150 175 200 225 250 275 300
Flow [l/min]
Δp [bar]
P-A/P-B/B-T
P-T
A-T
PRESSURE DROP 20ST(F)(B)44*6**
Measured at vicosity 68 cSt
0
1
2
3
4
5
6
7
8
9
10
11
12
13
0 50 100 150 200 250 300 350 400 450
Flow [l/min]
Δp [bar]
P-A/P-B/B-T
P-T
A-T
PRESSURE DROP 20ST(F)(B)44*8**
Measured at vicosity 68 cSt
0
1
2
3
4
5
6
7
8
9
10
11
12
0 75 150 225 300 375 450 525 600 675 750
Flow [l/min]
Δp [bar]
P-A/P-B
P-T
B-T
A-T
Directional Control Valves 20ST(F)(B) – 4-way
Rev. 2/1001 2.11.7
HYDRANOR
TECHNICAL DATA
Description
Symbol
Data
Max. operating pressure in port P, T, A, B
P
max
350 bar
Max. pressure in port L (must always be in use)
L
max
30 bar
Directional valve pilot pressure
SA/SB
8-30 bar / 8-45 bar
Test Pressure
420 bar
Hydraulic fluid
Mineral oils for hydraulic system
Viscosity range:
v
10 to 350 mm
2
/s (cST)
Viscosity index:
VI
120
Filtration, recommended filter with 20 100
Class 9 according to NAS 1638,
18/15 according to ISO 4406
Fluid temperature range:
T
-20 C to + 70 C
Ambient temperature range
T
-20 C to + 50 C
Standard Body Material
EN-GJS-400-15 (GGG 40)
Standard O-rings
Nitrile shore 70
Flow and Weights:
Size
Max. Flow
Weight
20 mm
200 l/min
14 kg
25 mm
300 l/min
20 kg
30 mm
450 l/min
36 kg
40 mm
700 l/min
95 kg
Directional Control Valves 20ST(F)(B) – 4-way
Rev. 2/1001 2.11.8
HYDRANOR
Interfaces:
Size
Description
Data
20ST:
Threaded Connections
Mounting Screws
Valve Body
Tightening
Torque [Nm]
20 mm
1” BSPP
2 off M 12 x 110
54.0
25 mm
1¼” BSPP
2 off M 16 x 130
78.5
30 mm
1½” BSPP
2 off M 16 x 145
40 mm
2” BSPP
2 off M 16 x 200
78.5
20STF:
SAE Flanges
Mounting Screws
Valve Body
Tightening
Torque [Nm]
30 mm
1¼” SAE 6000
2 off M 16 x 145
78.5
40 mm
1½” SAE 6000
2 off M 16 x 200
78.5
20STB:
Mounting Screws Valve Body
Tightening
Torque [Nm]
20 mm
4 off M 12 x 110– DIN 931
54.0
25 mm
4 off M 16 x 130 – DIN 931
78.5
30 mm
4 off M 16 x 145 – DIN 931
78.5
40 mm
4 off M 16 x 200 – DIN931
78.5
O-rings
Size [mm]
20 mm
4 off
1 off (manually operated valves only)
22.20 x 3.0
9.92 x 2.62
25 mm
4 off
1 off (manually operated valves only)
26.2 x 3.0
9.92 x 2.62
30 mm
4 off
1 off (manually operated valves only)
31.34 x 3.53
9.92 x 2.62
40 mm
4 off
1 off (manually operated valves only)
44.04 x 3.53
9.92 x 2.62
Directional Control Valves 20ST(F)(B) – 4-way
Rev. 2/1001 2.11.9
HYDRANOR
INSTALLATION
The Directional Control Valves 20ST(F)(B) are installed as follows:
The 20ST valves are installed with threaded connections and mounted to a bracket or
similar with 2 off screws.
The 20STF valves are installed to the pipeline with flanges and mounted to a bracket
or similar with 2 off screws.
The 20STB valves are installed with 4 off screws to a SUB plate or valve unit.
Please refer to ‘Interfaces’, for details about connections, flanges and screws.
OPERATION
The 20 ST valves are proportional remotely controlled by an external pilot pressure, which
moves the spool to the requested position.
The valves are equipped with a hand lever for override of the pilot pressure. The hand lever is
mechanically connected to the spool.
MAINTENANCE
Check the valve for proper function. Visually check the valve and if required, paint unpainted
(damaged) areas.
CAUTION: Do not paint the hand lever shaft seal.
STORAGE
If storage longer than 6 months is expected, the valve must be kept in a dry room, free from
dust and protected against sudden large temperature variations. For storage longer than 12
months, the valve must be filled with inhibition oil. Before use check all visible seals and
flush with clean oil.
MARKING
Inlets and outlets are marked, refer to figure in section ‘General Description’.