1/5
Type series: WDTUVA-60-10…
Reference: 400-P-170100-EN-01/06.2023
- Screw-in cartridge valve
- For cavity DU
- All external parts with zinc-nickel plating according to
DIN EN ISO 19598
- Oil warms up rapidly (cold-start phase)
- Direct-mounted in coolers or manifold blocks
- Low head loss
- Choice of various pressure settings
- Installation in threaded port body type GCUA
- Very good reproducibility
- Extremely reliable
- Very stable operation
- Temperature-dependent bypass control
Directional valve
Bypass thermostat valve
Q
max
= 120 l/min, p
max
= 50 bar
mechanically with thermostat element, integral relief function
Type series: WDTUVA-60-10…
Description
These direct acting bypass thermostat valves are size
10, temperature controlled, high performance screw-
in valves with an M27×2 mounting thread. They are in-
tended to be installed directly in coolers or line-moun-
ting body. Depending on the temperature of the oil,
they route the ow either straight to tank or through
the cooler. When the oil is cold (< 60 °C), the connecti-
on P to T is open (bypass), which means that the ow
is directed to tank with minimal headloss and the oil
warms up rapidly. After the changeover temperature
is reached (> 75 °C), the integral thermostat element
closes the connection P to T. The valve now directs the
oil ow through the cooler. With the integral pressure-
relief function, the bypass thermostat valve also safe-
guards the cooler by protecting it from any pressure
peaks that may result from excessive ow rates. The
maximum pressure is determined by the model that
is selected. The valves are predominantly used in coo-
lers in mobile as well as industrial applications. All
external parts of the valves are zinc-nickel plated and
are thus suitable for use in the harshest operating en-
vironments.
Symbol
s
P
T
2/5
Type series: WDTUVA-60-10…
Reference: 400-P-170100-EN-01/06.2023
Technical data
General characteristics Description, value, unit
Sales category minimum order quantity required (see order details)
Function group Directional valve
Function Bypass thermostat valve
Design Screw-in cartridge valve
Controls mechanically with thermostat element
Characteristic integral relief function
Construction size NG 10
Thread size M27×2
Mounting attitude unrestricted
Weight 0.2 kg
Cavity acc. factory standard For cavity DU
Tightening torque steel 60 Nm
Tightening torque aluminium 60 Nm
Tightening torque tolerance ± 10 %
Minimum ambient temperature - 30 °C
Maximum ambient temperature + 100 °C
Surface protection
All external parts with zinc-nickel plating according to
DIN EN ISO 19598
Sealing material see ordering code
Hydraulic characteristics Description, value, unit
Maximum operating pressure 50 bar
Maximum ow rate 120 l/min
Temperature for start of control action 60 °C
Flow direction see symbol
Hydraulic uid
HL and HLP mineral oil according to DIN 51 524; other uids
on request!
Minimum uid temperature - 30 °C
Maximum uid temperature + 100 °C
Viscosity range 10 … 650 mm²/s (cSt)
Recommended viscosity range 15 … 250 mm²/s (cSt)
Minimum uid cleanliness (cleanlineless class according to ISO
4406:1999)
class 20/18/15
3/5
Type series: WDTUVA-60-10…
Reference: 400-P-170100-EN-01/06.2023
Performance graphs
measured with oil viscosity 33.0 mm²/s (cSt)
Δp = f (T) Pressure drop-temperature Δp = f (Q) Pressure drop-ow rate characteristic
400-PG-0361
0
6 (85)
p [bar (psi)]∆
T [°C (°F)]
60 80 10040200
60 °C / 2 bar (140 °F / 30 psi)
1) Q = 20 l/min (5 gpm)
60 °C / 2 bar (140 °F / 30 psi)
1) Q = 20 l/min (5 gpm)
(140) (176) (212)(104)(68)
1)
1 (15)
2 (30)
3 (40)
4 (60)
5 (70)
400-PG-0362
0
p [bar (psi)]∆
1)1)
2)
2)
Q [l/min (gpm)]
120100806040200
1) T = 75 °C (167 °F)
1) T = 75 °C (167 °F)
2) T = < 50 °C (122 °F)
2) T = < 50 °C (122 °F)
(31)(26)(21)(15)(10)(5)
6 (85
)
1 (15
)
2 (30)
3 (40)
4 (60)
5 (70
)
60 °C / 2 bar (140 °F / 30 psi)
Δp = f (T) Pressure drop-temperature Δp = f (Q) Pressure drop-ow rate characteristic
400-PG-0283
0
p [bar (psi)]
∆
T [°C (°F)]
60 80 10040200
60 °C / 3 bar (140 °F / 40 psi)
1) Q = 20 l/min (5 gpm)
60 °C / 3 bar (140 °F / 40 psi)
1) Q = 20 l/min (5 gpm)
(140) (176) (212)(104)(68)
2 (30)
4 (60)
6 (85)
8 (120)
1)
400-PG-0284
0
p [bar (psi)]∆
1)1)
2)
2)
Q [l/min (gpm)]
120100806040200
1) T = 75 °C (167 °F)
1) T = 75 °C (167 °F)
2) T = < 50 °C (122 °F)
2) T = < 50 °C (122 °F)
(31)(26)(21)(15)(10)(5)
2 (30)
4 (60)
6 (85)
8 (120)
60 °C / 3 bar (140 °F / 40 psi)
Δp = f (T) Pressure drop-temperature Δp = f (Q) Pressure drop-ow rate characteristic
400-PG-0252
0
30 (430)
p [bar (psi)]∆
T [°C (°F)
]
60 80 10
0
40200
60 °C / 10 bar (140 °F / 140 psi)
1) Q = 20 l/min (5 gpm)
60 °C / 10 bar (140 °F / 140 psi)
1) Q = 20 l/min (5 gpm)
(140) (176)
(212)
(104)(68)
1)
5 (70)
10 (140)
15 (215)
20 (285)
25 (350)
400-PG-0251
0
p [bar (psi)]∆
1)1)
2)
2)
Q [l/min (gpm)]
120100806040200
1) T = 75 °C (167 °F)
1) T = 75 °C (167 °F)
2) T = < 50 °C (122 °F)
2) T = < 50 °C (122 °F)
(31)(26)(21)(15)(10)(5)
30 (430)
5 (70)
10 (140)
15 (215)
20 (285)
25 (350)
60 °C / 10 bar (140 °F / 140 psi)
4/5
Type series: WDTUVA-60-10…
Reference: 400-P-170100-EN-01/06.2023
Dimensions and sectional view
0[
Ø23.60×9.90
T
P
Beispiel für die Masseinheit:
Example for the dimensional units:
0.79 = 0.79 mm millimeter
M
A = 1)
+1%5
Installation information
IMPORTANT!
1) When tting the screw-in cartridge valve,
use the specied tightening torque. The value
can be found in the chapter "Technical data".
ATTENTION!
Only qualied personnel with mechanical
skills may carry out any maintenance work.
Generally, the only work that should ever be
undertaken is to check, and possibly replace,
the seals. When changing seals, oil or grease
the new seals thoroughly before tting them.
Application examples
V
2
V
1
WDTUV...
s
T
P
Manifold block with integral
cooler-bypass thermostat valve
5/5
Type series: WDTUVA-60-10…
Reference: 400-P-170100-EN-01/06.2023
Ordering code
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Related data sheets
Reference Description
400-P-040011 Form tools
400-P-060241 Cavity DU
400-P-740251 Threaded port body GCUA
info.ch@bucherhydraulics.com www.bucherhydraulics.com
© 2023 by Bucher Hydraulics AG Frutigen, 3714 Frutigen, Switzerland
All rights reserved.
Data is provided for the purpose of product description only, and must not be construed as warranted characteristics in the legal sense. The
information does not relieve users from the duty of conducting their own evaluations and tests. Because the products are subject to continual
improvement, we reserve the right to amend the product specifications contained in this catalogue.
