Electro-Proportional Valves — Pressure Control

TS08-27 — Proportional Pressure Control, Pilot-Operated Relief
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TS08-27 Valve
U.S. Patent 6,267,350
& 7,137,406


TS08-27 Valve symbol
A screw-in, cartridge-style, pilot-operated, hydraulic pressure 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. This valve is intended for use as a
pressure limiting device in demanding applications, and is ideal for hydraulic fan drive

The TS08-27 blocks flow from 1 to 2 until sufficient pressure is present at 1 to open the
valve by overcoming the preset induced 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. The regulated pressure is inversely
proportional to the input electrical current.

• 12 and 24 volt coils standard.
• Industry common cavity.
• Waterproof coils standard.

Max. Operating Pressure: 241 bar (3500 psi)
Electrical Parameters:
D-Coil E-Coil
10 VDC 12 VDC 20 VDC 24 VDC 12 VDC 24 VDC
Max Control Current
1.50 1.31 0.85 0.65 1.40 0.70
Resistance (Nominal)
3.1 5.4 12.2 21.7 5.4 21.7
Relief Pressure Range: from zero to max. control current; minimum pressure is factory-adjusted:
   Range A: 207 to 6.9 bar (3000 to 100 psi); Range B: 138 to 6.9 bar (2000 to 100 psi); Range C: 68.9 to
   6.9 bar (1000 to 100 psi)
Rated Flow: 24.6 lpm (6.5 gpm); ΔP = 13.8 to 17.2 bar (200 to 250 psi), cartridge only,
   1 to 2 coil energized
Max. Pilot Flow: 0.76 lpm (0.2 gpm)
Hysteresis: at PWM 200 Hz (% of max pressure) Range A: 3.2; Range B: 3.0; Range C; 4.8
Flow Path: Free Flow: 1 to 2 coil energized; Relieving: 1 to 2 coil de-energized
Pressure Rise: Range A: 0.48 bar/lpm (26.5 psi/gpm); Range B: 0.36 bar/lpm (20 psi/gpm);
   Range C: 0.46 bar/lpm (25 psi/gpm)
Temperature: -40° to 120°C (-40° to 250°F) with Buna seals;
   -35° to 204°C (-31° to 400°F) with fluorocarbon 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

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




TS08-27 Valve Performance Chart


TS08-27 Performance curves



TS08-27 Valve Dimensions



Cartridge: Weight: 0.15 kg (0.33 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.

EHPR D-Coil: Weight each: 0.11 kg
(0.25 lb); Unitized thermoplastic
encapsulated, Class H high temperature
magnetwire. See page 3.200.1_EHPR.

EHPR E-Coil: Weight: 0.14 kg (0.3 lb);
Perfect wound, fully encapsulated with rugged
external metal shell; Rated up to IP69K with
integral connectors.
See page 3.400.1_EHPR.



TS08-27 Ordering Chart