ELECTRO-PROPORTIONAL VALVES—PRESSURE CONTROLS
TS38-20 Proportional Electric Relief Valve
DESCRIPTION
A screw-in, cartridge-style, direct acting, poppet-type hydraulic relief valve, which
can be infinitely adjusted across a prescribed range using a variable electric input.
Pressure output is proportional to DC current input. This valve is intended for use as a
pressure limiting device in demanding applications.
OPERATION
The TS38-20 blocks flow from 1 to 2 until sufficient pressure is present at 1 to offset
the electrically induced solenoid force. With no current applied to the solenoid, the
valve will free flow from 1 to 2.
Note: Back pressure on port 2 becomes additive to the pressure setting at a 1:1 ratio.
The optional manual override allows the valve to be set when the electric supply is
lost. The manual setting is added to the electric setting. To prevent the system from
being over pressurized, the manual override should always be disengaged prior to
applying power to the coil.
FEATURES
• 12 and 24 volt coils standard.
• Industry common cavity.
RATINGS
Pressure Rating: 248.2 bar (3600 psi)
Proof Pressure: 268.9 bar (3900 psi)
Burst Pressure: 751.5 bar (10900 psi)
Electrical Parameters:
COIL
SERIES
NOMINAL
VOLTAGE
(VDC)
TYPICAL
RESISTANCE AT
20°C (68°F) (OHMS)
VALVE
INDUCTANCE
(Mh)
MAXIMUM
CONTROL
CURRENT (A)
D
12 7.2 ± 3% 141 1.10
24 28.8 ± 5% 626 0.55
E
12 7.1 ± 3% 139 1.32
24 28.5 ± 5% 600 0.66
Control Signal: DC or PWM (Significant improvements in valve performance occur
with superimposed dither, with either control method.)
Dither Frequency: 200 Hz or higher
Hysteresis with Dither 250 Hz: 3.3% (7% maximum without dither)
Operational Relief Pressure Range from Zero to Maximum Control Current:
A: 0–207 bar (0–3000 psi); B: 0–138 bar (0–2000 psi); C: 0–69 bar (0–1000 psi)
Note: Minimum pressure setting is dependent on flow through the valve.
(See Pressure Drop Curve)
Rated Flow: A: 11.4 lpm/3 gpm @ 20 bar/290 psi pressure drop B: 11.4 lpm/3 gpm
@ 10 bar/150 psi pressure drop C: 11.4 lpm/3 gpm @ 5.5 bar/80 psi pressure drop
Note: See Pressure Drop Curve.
Internal Leakage: 1 ml/min (20 drops/minute) max. at 207 bar (3000 psi)
Step Response: T
ON
<50 ms; TOFF <7 ms
Flow Path: Free Flow: 1 to 2 coil de-energized; Relieving: 1 to 2 coil energized
Temperature: -40 to 100°C (-40 to 212°F) with standard Buna N seals
Filtration: See page 9.010.1
Fluids: Mineral-based or synthetics with lubricating properties at viscosities of
7.4 to 420 cSt (50 to 2000 sus); See Temperature and Oil Viscosity, page 9.060.1
Installation Recommendation: When possible, the valve should be mounted below
the reservoir oil level. This will maintain oil in the armature preventing trapped air
instability. If this is not feasible, mount the valve horizontally for best results.
Cavity: VC08-2; See page 9.108.1;
Cavity Tool: CT08-2XX; See page 8.600.1
Seal Kit: SK08-2X-B; See page 8.650.1
Coil Nut: Part No. 4540560; Note: For E-coils manufactured prior to 1-1-04, see
page 3.400.1 for coil nut info.
ISO SYMBOL
2.813.1
PERFORMANCE
FLOW (gpm)
FLOW (lpm)
PRESSURE (bar)
PRESSURE (psi)
Pressure Drop vs. Flow Characteristic
For Flow 1 to 2 with Coil De-energized
Vertical Mount - - - - Horizontal Mount ——
0123
0
00
50
100
150
200
250
300
2
4
6
8
10
12
14
16
18
20
22
2468 1210
A
B
C
Relief Pressure vs.
Current (DC) 250 Hz Dither
Relieving Pressure 1 to 2
PRESSURE (psi)
0
500
1000
1500
2000
2500
3000
3500
PRESSURE (bar)
0
50
100
150
200
250
% of Maximum Control Current
02010 30 50 70 9040 60 80 100
A
B
C
• Optional waterproof E-Coils rated up to IP69K.
• Manual override optional.
HYDRAFORCE
.com
®
Performance info. continued on following page.
Blue rectangles are links to other catalog pages.
MATERIALS
Cartridge: Weight: 0.18 kg. (0.39 lbs.)
Steel with hardened work surfaces.
Zinc-plated exposed surfaces.
Buna N O-rings and polyester
elastomer back-ups standard.
Standard Ported Body: Weight:
0.16 kg. (0.35 lbs.) Anodized high-
strength 6061 T6 aluminum alloy,
rated to 207 bar (3000 psi). Ductile
iron bodies available; dimensions
may differ. See page 8.008.1
Standard Coil: Weight: 0.32 kg.
(0.7 lbs.) Unitized, thermoplastic
encapsulated, Class H high
temperature magnetwire.
See page 3.200.1.
E-Coil: Weight: 0.41 kg. (0.9 lbs.) Fully
encapsulated with rugged external
metal shell. Rated up to IP69K with
integral connectors.
Note: See page 3.400.1 for all
E-Coil retrofit applications.
TO ORDER
TS38-20
2.813.2
TS38-20 __ __ - __ - __ - __ __ __ __
Porting
Cartridge Only 0
SAE 6 6T
3/8 in. BSP* 3B
1/2 in. BSP* 4B
*BSP Body; U.K. Mfr. Only
TYPICAL RELIEF PRESSURE VS. FLOW CHARACTERISTIC
Typical Relieving Pressure Port 1 to Port 2
Pressure Range A - 0-206.8 bar (0-3000 psi)
B - 0-137.9 bar (0-2000 psi) C - 0-68.9 bar (0-1000 psi)
FLOW (LPM)
FLOW (GPM)
0
01234 56789
0.5 1.0 1.5 2.0 2.5
0
50
100
150
200
PRESSURE (BAR)
500
1000
1500
2000
2500
3000
3500
PRESSURE (PSI)
0
10
3.0
11
Range A
Range B
Range C
Maximum
Relief Pressure
207 bar (3000 psi) A
138 bar (2000 psi) B
69 bar (1000 psi) C
Option
None
(Blank)
Manual Override M
1.62
41.1
1.84
DIA.
46.7
2.97
75.4
Std. Coil
View
E-Coil
View
TORQUE
4-5 ft-lbs
(5.4–6.8 Nm)
max.
TORQUE
25 – 27 ft-lbs
(33.9 – 36.6 Nm)
max.
1.63
41.1
DIMENSIONS
Voltage
0 Less Coil
10 10 VDC (1/3 amps max.)
12 12 VDC (1.10 amps max.)
20 20 VDC (0.65 amps max.)
24 24 VDC (0.55 amps max.)
Termination Std. Coil
DS Dual Spades
DG DIN 43650
DL Leadwires (2)
DL/W Leads w/Weatherpack®
Connectors
DR Deutsch DT04-2P
Termination E-Coil
ER Deutsch DT04-2P
(IP69K Rated)
EY Metri-Pack® 150
(IP69K Rated)
EL IP69K Rated
EJ Amp. Jr. Timer
(IP67 Rated)
EG DIN 43650 (IP65 Rated)
Seals
Buna N (Std.) N
Fluorocarbon V
Polyurethane P
®
HYDRAFORCE
HYDRAFORCE
.com
®
PERFORMANCE (continued)
Recommended Electronic Controllers:
Model EFDR2 Multi-Input Fan Drive Controller.
For more information go to:
http://www.hydraforce.com/Electro/fandrive.htm
or see catalog page 2.001.1 (Table 2)
Relief Pressure vs. Current
D-Coil vs. E-Coil
PRESSURE (psi)
0
500
1000
1500
2000
2500
3000
3500
PRESSURE (bar)
0
50
100
150
200
250
Control Current (mA)
0 400200 600 1000800 1200
D-Coil
E-Coil
Blue rectangles are links to other catalog pages.
