Electro-Proportional Valves — Pressure Control

TS38-20 — Proportional Pressure Control, Relief
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TS38-20 Valve

TS38-20 Valve symbol
A screw-in, cartridge-style, direct acting, single stage, 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.

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.

• 12 and 24 volt coils standard.
• Optional waterproof E-Coils rated up to IP69K.
• Industry common cavity.
• Manual override option.

Pressure Rating: 248 bar (3600 psi)
Burst Pressure: 751.5 bar (10900 psi)
Proof Pressure: 268.9 bar (3900 psi)
Electrical Parameters:
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 of 250 Hz: 3.3%; without Dither: 7% maximum
Operational Relief Pressure Range: from zero to max. control current:
   Range A: 0 to 207 bar (3000 psi); Range B: 0 to 138 bar (2000 psi); Range C: 0 to 69 bar (1000 psi)
   Note: Minimum pressure setting is dependent on flow through the valve (see Pressure Drop Curve)
Rated Flow: Range A: 11.4 lpm (3 gpm) at 20 bar (290 psi) pressure drop;
   Range B: 11.4 lpm (3 gpm) at 10 bar (150 psi) pressure drop;
   Range C: 11.4 lpm (3 gpm) at 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 Reponse: TON <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 Buna N seals;
   -26° to 204°C (-15° to 400°F) with Fluorocarbon seals;
   -54° to 107°C (-65° to 225°F) with Polyurethane 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: 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; See page 9.020.1
Cavity: VC08-2; See page 9.108.1_2w
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




TS38-20 Valve Performance Chart


TS38-20 Performance



TS38-20 Valve Dimensions



Cartridge: Weight: 0.18 kg (0.39 lb);
Steel with hardened work surfaces.
Zinc-plated exposed surfaces; Buna N
O-rings and polyester elastomer back-ups

Standard Ported Body: Weight: 0.16 kg
(0.35 lb); 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_2w.

Standard D-Coil: Weight each: 0.32 kg
(0.7 lb); Unitized thermoplastic encapsulated,
Class H high temperature magnetwire.
See page 3.200.1_10-size.

E-Coil: Weight: 0.41 kg (0.9 lb); Perfect
wound, fully encapsulated with rugged
external metal shell; Rated up to IP69K
with integral connectors.
See page 3.400.1_10-size.



TS38-20 Ordering Chart