Electro-Proportional Valves — Pressure Control

TS38-21 — Proportional Pressure Control, Relief
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TS38-21 Valve
U.S. Patent 6,267,350

TS38-21 Valve symbol
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 inversely proportional to DC current input.

The TS38-21 blocks flow from 1 to 2 until sufficient pressure is present at 1 to open the
valve by overcoming the preset spring force. With no current applied, the valve will relieve
at ±50 psi of the spring maximum. Applying current to the coil reduces the induced spring
force thereby reducing the valve setting.

• 12 and 24 volt coils standard.
• Optional waterproof E-Coils rated up to IP69K.
• Industry common cavity.
• Hardened parts for long life.

Max. Operating Pressure: 240 bar (350 0 psi)
Max. Control Current: 1.10 amps for 12 VDC coil; 0.55 amps for 24 VDC coil
Relief Pressure Range: from zero to max. control current
   Minimum pressure is factory-adjustable:
   Range A: 207 to 6.9 bar (3000 to 100 psi); Range B: 138 to 6.9 bar (2000 to 100 psi);
   Range C: 69 to 6.9 bar (1000 to 100 psi); Range D: 241 to 6.9 bar (3500 to 100 psi)
Rated Flow: 1.1 lpm/0.3 gpm; ΔP = 10 bar (150 psi), cartridge only, 1 to 2 coil energized
Flow Path: Free Flow: 1 to 2 coil energized; Relieving: 1 to 2 coil de-energized
Electrical Parameters:
D 12 6.7 ± 3% 134 1.10
24 28.8 ± 5% 500 0.55
E 12 7.1 ± 3% 160 1.28
24 28.5 ± 5% 620 0.64
Dither Frequency: 200 Hz
PWM Frequency: 200 Hz
Hysteresis: A & D: 2.5%; B: 4%; C: 5%
Temperature: -40° to 100° C (-40° to 212° F) with Buna seals;
   -26° to 204° C (-15° to 400° F) with fluorocarbon seals;
   -54° to 107°C (-65° to 224°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. 4540550

See model EFDR2 Multi-Input Fan Drive Controller, or EVDR-Type Controller Selection Guide,
or for other Electronic Controllers, see page 2.001.1_pdf




TS38-21 Valve Performance Chart


TS38-21 Performance



TS38-21 Valve Dimensions



Cartridge: 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 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.



TS38-21 Ordering Chart