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(D)(T) 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 steering units has
to be as short as possible, but should not exceed 1,5 m [4.92 ft] (for iron pipe with 4 mm
[.157 in.] internal diameter). When a rubber hose is used this length has to be even
shorter.
Priority valves with dynamic signal work in a system with dynamic hydrostatic steering
units type HKUS.../5D (5DT).
Modulary Mounting
LS
CF
L
T R
R
LS
CF
L
L
Pipe Mounting
L
EF
CF
T R
R
LS
P
EF T
P
P
EF T
Static signal
Dynamic signal
Static signal
PRD 40,80/...
PRDD 40,80/...
PRT 40,80,120/..., PRTA 40,80/...
EF
CF
PR...40
P-EF
[bar]
LS
P-EF
[PSI]
P
Dynamic signal
14
12
180
10
140
PRTD 40,80,120/...,PRTAD40,80/...
10 bar
EF
CF
7 bar
8
100
6
4
2
LS
PP
4 bar
60
P
Min.
20
0
2
0
4
10
6
20
8
10
30
40
Qp
Static signal with External Port
[GPM]
PRTE120/...
Qp
[l/min]
PR...80
PRТ...120
P-EF
[PSI]
P-EF
[bar]
14
12
10
10 bar
180
16
14
7 bar
140
100
10
4 bar
6
60
4
Min.
20
Qp
0
2
0
6
20
10
40
200
10 bar
14
18
60
7 bar
150
4 bar
8
6
2
250
12
8
4
P-EF
[PSI]
P-EF
[bar]
[GPM]
100
Min.
50
Qp
[GPM]
2
0
80 Qp
[l/min]
0
5
0
21
20
10
40
15
60
20
80
25
100
30
120
Qp
[l/min]
PRD ,PRT
PRT
PRD,
PRIORITY VALVES
VALVES
PRIORITY
SPECIFICATION DATA
Type
Parameters
PRD(D), PRT(D)
Rated Flow
.
Control Spring Pressure
.
Max. Pressures in Oil Ports:
bar
[PSI]
lpm
[GPM]
bar
[PSI]
PRTA(D)
40
[10.6]
4
[58]
80
[21.1]
4
[58]
10
7
[101.5] [145]
120
[31.7]
4
10
7
[101.5] [145] [58]
P, EF
250
[3625]
CF
210
[3045]
280
[4061]
R, L
PRT(D)(E)
10
7
[101.5] [145]
210
[3045]
LS
210
[3045]
PP
20
[290]
.
T
Weight
.
2,25
[4.96]
kg
[lb]
2,1
[4.6]
1,3
[2.87]
P - pump, EF - excess flow, CF - control flow (first priority oil flow),
L - left, R - right, LS - load sensing, T - tank, PP - pilot pressure (L,R and T - for PRD(D) only).
DIMENSIONS AND MOUNTING DATA - PRD(D) 40, 80/...
44
[1.732]
42 [1.654]
44
[1.732]
123 [4.843]
c
o
d
e
87 [3.425]
R
87 [3.425]
P
60 [2.362]
T
EF
P
T
*
20 [.787]
78 [3.071]
L
R
35 [1.378]
EF
L
Ports - P, EF
Thread
Ports - T, R, L
Thread
-
G1/2
18 [.71] depth
G3/8
18 [.71] depth
M
M22x1,5
18 [.71] depth
M18x1,5
18 [.71] depth
A
7/8 - 14 UNF
O-ring 18 [.71] depth
3/4 - 16 UNF
O-ring 18 [.71] depth
* Connection to the HKUS.../5(D)... is done with 2 screws M10x1x45 -10.9
DIN 912 or with 2 screws 3/8-24 UNF ANSI B18.3-76, 1.75'' long.
Tightening torque: 4,5±0,5 daNm [360 ± 440 lb-in ].
mm [in]
22
PRD
PRT
PRD,, PRT
PRIORITY VALVES
DIMENSIONS AND MOUNTING DATA - PRT(D) 40, 80/...
EF
2 x ø17 [.669]
22 [.866]
LS
142 [5.6]
87 [3.43]
87 [3.43]
60 [2.36]
P
EF
0,1
[.004]
42 [1.654]
11 [.431]
35 [1.378]
P
20 [.787]
78 [3.071]
CF
22 [.866]
2 x ø10,5
[.413]
c
o
d
e
Ports - P, EF
Thread
Port - CF
Thread
LS - Port
-
G1/2
18 mm [.71] depth
G1/2
18 mm [.71] depth
G1/4
14 mm [.55] depth
M
M 22x1,5
18 mm [.71] depth
M 22x1,5
18 mm [.71] depth
G1/4
14 mm [.55] depth
A
CF
7/8 - 14 UNF
7/16 - 20 UNF
3/4 - 16 UNF
O-ring 18 [.71] depth O-ring 18 [.71] depth O-ring 12,7 [.50] depth
DIMENSIONS AND MOUNTING DATA - PRTA(D) 40, 80/...
CF
EF
25[.984]
S=24 [.945]
20,3 [.799]
40 [1.575]
LS
P
19,7 [.776]
80 [3.150]
19,7 [.776]
ø8,5 [.335]
P
LS
20,5 [.807]
42 [1.654]
41 [1.614]
142 [5.591]
CF
EF
c
o
d
e
Ports - P, EF
Thread
Port - CF
Thread
LS - Port
-
G1/2
18 mm [.71] depth
G1/2
18 mm [.71] depth
G1/4
14 mm [.55] depth
M
M 22x1,5
18 mm [.71] depth
M 22x1,5
18 mm [.71] depth
G1/4
14 mm [.55] depth
A
7/8 - 14 UNF
7/16 - 20 UNF
3/4 - 16 UNF
O-ring 18 [.71] depth O-ring 18 [.71] depth O-ring 12,7 [.50] depth
mm [in]
23
PRD
PRT
PRD,, PRT
PRIORITY VALVES
DIMENSIONS AND MOUNTING DATA - PRT...120/...
29.3 [1.154]
P
57,1 [2.248]
EF
116 [4.570]
138 [5.433]
48 [1.890]
24 [.945]
LS
PP
S=19
[.748]
28 [1.102]
10 [.394]
18.7 [.736]
56 [2.205]
CF
38.4 [1.512]
24 [.945]
ø34 [1.339]
0,8 [.032] depth
c
o
d
e
Ports - P, EF
Thread
Port - CF
Thread
LS, PP - Ports
-
G3/4
20,5 [.81] depth
G1/2
18,5 [.73] depth
G1/4
12,5 [.49] depth
M
M27x2
20,5 [.81] depth
M18x1,5
18,5 [.73] depth
M12x1,5
12,5 [.49] depth
3/4 - 16 UNF
7/16 - 20 UNF
1 1/16 - 12 UN
A O-ring 20,5 [.81] depth O-ring 18,5 [.73] depth O-ring 12,5 [.49] depth
mm [in]
24
2x ø8,7 [.343]
52 [2.047]
93 [3.660]
52 [2.047]
66 [2.598]
S=19
[.748]
PRIORITY VALVES FOR HKU(S).../5T... TYPE PRT...160/...
EF
CF
LS
The Priority Valves PRT...160 have a built-in pilot
pressure relief valve, which protects the steering
unit against excessive 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 ports of the steering unit.
T
P
Static signal
PRT 160/...
SPECIFICATION DATA
Type
Parameters
Rated Flow
.
Control Spring Pressure
.
Max. Pressures in Oil Ports:
bar
[PSI]
EF
CF
lpm
[GPM]
bar
[PSI]
160
[42.3]
4
[58]
10
7
[101.5] [145]
P, EF
350
[5076]
CF
210
[3045]
LS
210
[3045]
.
Dynamic signal
PRTD 160/...
EF
CF
15
[217]
T
Standard Relief Valve Pressure Settings
bar [PSI] *
Weight
kg
.
[lb]
T
P
210
[3045]
PP
175
[2540]
4,4
[9.70]
T
Static signal with External Pilot
PRTE 160/...
* - Adjusted valve pressure from 80 bar [1160 PSI] to 210 bar [3045 PSI]
upon customer request.
P - pump, EF - excess flow, CF - control flow (first priority oil flow),
LS - load sensing, T - tank, PP - pilot pressure
PR...160/...
P-EF
[PSI]
14
12 180
10 bar
7 bar
10 140
8
6
4
2
0
4 bar
100
Min.
60
20
Qp
0
4
0
10
8
12
20 30 40
LS
PP
P
P-EF
[bar]
LS
PRT(D), PRTE
16
50 60 70
20
24
28
32
36
40 42 [GPM]
80 90 100 110 120 130 140 150 160 Qp
[l/min]
25
PRT
PRIORITY VALVES
DIMENSIONS AND MOUNTING DATA - PRT(D)(E)160/...
EF
CF
59 [2.323]
122 [4.803]
177,5 [6.988]
75 [2.953]
T
32,5 [1.280]
35[1.378]
65 [2.559]
28,5 [1.122]
35 [1.378]
59 [2.323]
60,5 [2.382]
75 [2.953]
24 [.945]
32 [1.260]
121[4.764]
60,5 [2.382]
132,5 [5.217] max
PP
2x ø9 [.354]
32,8 [1.291]
63 [2.480]
LS
130 [5.118]
99 [3.898]
40 [1.575]
P
2x ø42 [1.654]
0,8 [.031] depth
c
o
d
e
Ports - P, EF
Thread
Port - CF
Thread
LS, PP, T - Ports
-
G3/4
20,5 [.81] depth
G1/2
18,5 [.73] depth
G1/4
12,5 [.49] depth
M
M27x2
20,5 [.81] depth
M18x1,5
18,5 [.73] depth
M12x1,5
12,5 [.49] depth
3/4 - 16 UNF
7/16 - 20 UNF
1 1/16 - 12 UN
A O-ring 20,5 [.81] depth O-ring 18,5 [.73] depth O-ring 12,5 [.49] depth
mm [in]
26
PR...
PRIORITY VALVES
ORDER CODE
1
2
3
/
PR
5
4
7
6
-
Pos.5 - Ports
Pos.1 - Mounting
D - Modularly Mounting
T
- Pipe Mounting (Model 1)
TA
- Pipe Mounting (Model 2)
omit - BSPP (ISO 228)
M
- Metric (ISO 262)
A
- SAE (ANSI B 1.1 - 1982)
Pos.6 - Option [Paint]***
omit - No Paint
P
- Painted Low Gloss Color
PC - Corrosion Protected Paint
Pos.2 - Signal Type
omit - with Static signal
D - with Dynamic signal
E* - with Static signal and External Pilot
Pos.7 - Design Series
omit - Factory specified
Pos.3 - Rated Flow, l/min
40
80 120** 160**
Pos.4 - Control Spring Pressure , bar
4
7
10
Notes: * For PRT 120/... and PRT 160/... only
** For PRT only
*** Colour at customer’s request.
The priority valves are mangano-phosphatized as standard.
27