PRIORITY VALVES FOR HKUS.../5... TYPE PR...
The Priority Valves distribute and trace the hydraulic flow from the supply pump of the
hydraulic system to the hydraulic components which control and run the vehicle.
The Priority Valves are used only with the HKUS.../5(E)(T)(TE) hydrostatic steering units.
When connected, the steering unit and the priority valve represent sophisticated hydraulic
tracing system that controls the flow in both main pipelines of the hydraulic system (the
working and control one) at any time of its operation.
As a static signal, the "LS" signal must be used in systems with circuit stability. The
connection between the PRT, PRTA priority valves and the HKUS.../5T(TE) steering units
has to be as short as possible, but should not exceed 1,5m (for iron pipe with ø4
internal diameter). When a rubber hose is used this length have to be even shorter.
Modulary Mounting
LS
CF
L
T
R
L
R
L
P
EF
T
LS
CF
R
R
L
T
EF
P
Static signal
PRD...40,80/...
T
Dinamic signal
PRDD...40,80/...
Pipe Mounting
EF
CF
EF
CF
LS
LS
P
P
Static signal
PRT...40,80/...; PRTA... 40,80/...
Dinamic signal
PRTD...40,80/...; PRTAD... 40,80/...
PR...40
PR...80
P-EF
[bar]
P-EF
[bar]
14
14
10 bar
12
10
7 bar
10
7 bar
8
8
6
4 bar
6
4 bar
4
4
Min.
2
0
10 bar
12
Qp
0
10
20
30
40
Min.
2
0
[l/min]
22
Qp
0
20
40
60
80
[l/min]
PRD
PRIORITY VALVES
SPECIFICATION DATA
Type
Parameters
Rated Flow
PRD(D), PRT(D)
[l/min]
Control Spring Pressure
Max. Pressures in Oil Ports:
[bar]
40; 80
[bar]
10
7
4
4
P, EF, R, L
250
LS, CF
175
T
Weight, avg.
PRTA(D)
7
10
20
[kg]
2,7
1,2
P - pump, EF - excess flow, CF - control flow (first priority oil flow),
L - left, R - right, LS - load sensing, T - tank
DIMENSIONS AND MOUNTING DATA - PRD(D) 40,80/...
*
42
78
2 x ø29
0,5 mm depth
3 x ø25
0,5 mm depth
20
L
R
35
EF
T
44
P
123
87
c
o
d
e
P
60
EF
R
L
Ports - P, EF
Thread
Ports - T, R, L
Thread
-
G1/2
18 mm depth
G3/8
18 mm depth
M
M22x1,5
18 mm depth
M18x1,5
18 mm depth
A
7/8 - 14 UNF
O-ring 18 mm depth
3/4 - 16 UNF
O-ring 18 mm depth
87
T
* Connection to the HKUS.../5... is done with 2 screws M10x1x45-10.9 DIN 912 or
with 2 screws 3/8-24 UNF ANSI B18.3-76; 44,5 mm long.
Tightening torque: 4,5±0,5 daNm.
23
PRT, PRTA
PRIORITY VALVES
DIMENSIONS AND MOUNTING DATA - PRT(D) 40,80/...
EF
3 x ø29
0,5 mm depth
20
42
11
78
35
2 x ø17
CF
0,1
22
2 x ø10,5
LS
142
87
c
o
d
e
Ports - P, EF
Thread
Port - CF
Thread
LS - Port
-
G1/2
18 mm depth
G1/2
18 mm depth
G1/4
14 mm depth
M
M22x1,5
18 mm depth
M22x1,5
18 mm depth
G1/4
14 mm depth
60
87
P
EF
P
22
3/4 - 16 UNF
7/16 - 20 UNF
7/8 - 14 UNF
O-ring 18 mm depth O-ring 18 mm depth O-ring 12,7 mm depth
A
CF
DIMENSIONS AND MOUNTING DATA - PRTA(D) 40,80/...
20,3
EF
25±0,3
CF
S=24
ø8,5+0,2
19,7
LS
40
LS
80±0,3
P
P
19,7
20,5
42
41±0,3
142
3 x ø29
0,5 mm depth
CF
EF
c
o
d
e
Ports - P, EF
Thread
Port - CF
Thread
LS - Port
-
G1/2
18 mm depth
G1/2
18 mm depth
G1/4
14 mm depth
M
M22x1,5
18 mm depth
M22x1,5
18 mm depth
G1/4
14 mm depth
A
3/4 - 16 UNF
7/16 - 20 UNF
7/8 - 14 UNF
O-ring 18 mm depth O-ring 18 mm depth O-ring 12,7 mm depth
24
PRIORITY VALVES FOR HKUS.../5... TYPE PRT...160/
EF
CF
The Priority Valves PRT.../160 have built-in a pilot
pressure relief valve, who protects the steering unit
against excess pressure. The pilot pressure relief
valve operates with the Shuttle of the Priority valve to
limit the maximum steering pressure P-T measured
across the steering units ports.
P
Static signal
PRT 160/...
EF
CF
SPECIFICATION DATA
LS
T
LS
Type
Parameters
PRT(E), PRTD(E)
Rated Flow
[l/min]
160
Control Spring Pressure
[bar]
Max. Pressures in Oil Ports:
P, EF
250
LS, CF
210
[bar]
T
15
PP
210
Standart Releif Valve Pressure Settings [bar]
175*
Weight, avg.
[kg]
P
10
7
4
Dinamic signal
PRTD 160/...
EF
CF
T
LS
PP
4,9
* - Adjusted valve pressure from 80 till 210 bar upon customer request.
P - pump, EF - excess flow, CF - control flow (first priority oil flow),
LS - load sensing, T - tank, PP - pilot pressure
P
T
Static signal with External Pilot
PRTE 160/...
PRT...160/...
P-EF
[bar]
14
12
10 bar
10
7 bar
8
4 bar
6
Min.
4
2
0
Qp
0
10
20
30
40
50
60
70
80
90 100 110 120 130 140 150 160 [l/min]
25
PRT
PRIORITY VALVES
DIMENSIONS AND MOUNTING DATA - PRT...160/...
EF
CF
59
122
65
177,5
32,8
24
32,5
PP
60,5
32
LS
24
EF
35
T
2xø8,9±0,2
max 130
P
121
T
35
75
LS
CF
65
c
o
d
e
130
99
40
P
2 x ø42
0,8 mm depth
Ports - P, EF
Thread
Port - CF
Thread
-
G3/4
G1/2
G1/4
20,5 mm depth 18,5 mm depth 12,5 mm depth
A
1 1/16 - 12 UN 3/4 - 16 UNF 7/16 - 20 UNF
O-ring
O-ring
O-ring
20,5 mm depth 18,5 mm depth 12,5 mm depth
M
M27x2
20,5 mm depth
M12x1,5
M18x1,5
18,5 mm depth 12,5 mm depth
ORDER CODE
1
2
3
/
PR
5
4
7
6
Pos.5 - Ports
Pos.1 - Mounting
D
T
TA
- Modularly Mounting
- Pipe Mounting (Model 1)
- Pipe Mounting (Model 2)
omit - BSPP (ISO 228)
A
- SAE (ANSI B 1.1 - 1982)
M
- Metric (ISO 262)
Pos.6 - Option (Paint)***
omit - No Paint
P
- Painted
PC - Corrosion Protected Paint
Pos.2 - Signal Type
omit - with Static signal
D - with Dinamic signal
E* - with Static signal w/ External Pilot
Pos.7 - Design Series
omit - Factory specified
Pos.3 - Rated Flow, l/min
40
80 160**
Pos.4 - Control Spring Pressure , bar
4
7
LS, PP, T - Ports
10
NOTES:* Only for PRT 160/...
** Only for PRT
*** Colour at customer’s request.
The priority valves are mangano-phosphatized as standard.
26