Electro-Proportional Valves — Pressure Control

TS12-27 — Proportional Pressure Control, Pilot-Operated Relief
  Selection guide - similar valves.
  PDF file of this page.
  STP file for TS12-27.
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TS12-27 Valve
U.S. Patent 6,267,350


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 applications.

The TS12-27 blocks flow from 1 to 2 until sufficient pressure is present at 1 to open the pilot
section by overcoming the induced spring force. With no current applied, the valve will relieve
at maximum set pressure. Applying current to the coil proportionally decreases the pressure
required to open the valve from 1 to 2.
Note: This valve is ideal for hydraulic fan drive applications. Consult factory for electronic
controllers specifically designed for fan drive applications.

• Several adjustable pressure ranges plus factory preset fixed pressure model.
• Hardened parts for long life.
• 12 and 24 volt coils standard.
• Industry common cavity.
• Optional waterproof E-Coils rated up to IP69K.

Pressure Rating (For TS12-27 A, B and C): 248.2 bar (4000 psi) at Port 1;
   68.9 bar (1000 psi) at Port 2.
   (For TS12-27F): 310 bar (4500 psi) at Port 1.
Proof Pressure (For TS12-27 A, B and C): 344.7 bar (5500 psi) at Port 1;
   241.3 bar (3000 psi) at Port 2.
   (For TS12-27F): 413.7 bar (6000 psi) at Port 1; 206.8 bar (3000 psi) at Port 2.
Burst Pressure (For TS12-27 A, B and C): 758.4 bar (11,000 psi)
   (For TS12-27F): 814 bar (11,800) psi
Flow Rating: 190 lpm (50 gpm) ?P = 15.1-18.9 bar (220-275 psi) (Cartridge only) Port 1 to 2
  (Coil energized).
Adjustable Pressure Range from Zero to Maximum Control Current:
   at 7.6 lpm (2 gpm)* A: 207–6.9 bar (3000–100 psi) B: 138–6.9 bar (2000–100 psi)
   C: 69–6.9 bar (1000–100 psi)
   *Note: Minimum pressure can be factory set to 6.2 -1.3 bar (90-150 psi)
Maximum Pilot Flow: 0.76 lpm (0.2 gpm)
Maximum Tank Pressure in Dynamic Condition: 103.4 bar (1500 psi)
Pressure Rise: A: 0.29 bar/lpm (16 psi/gpm); B: 0.24 bar/lpm (13 psi/gpm);
   C: 0.18 bar (10 psi/gpm)
Hysteresis (PWM): A: 2.5% B: 3.4% C: 6% F: 4%
Electrical Parameters:

Typical Max. Current
(amp) at 0 gpm

Typical Resistance ±5%
at 20°C (ohms)

Typical Apparent Inductance (mH)

12 VDC 24 VDC 12 VDC 24 VDC 12 VDC 24 VDC
D-Coil 1.15 amp 0.57 amp 6.7 ohms ±3% 25 ohms ±5% 134 mH 500 mH
E-Coil 1.20 amp 0.60 amp 7.32 ohms ±3% 29.4 ohms ±5% 139 mH 560 mH
* Note: For F, the Control Current Range for E-coils is 1.4 to 0.9 amps for 12 VDC and 0.7 to 0.45 amps for 24 VDC. Coil Resistance for 12 VDC is 7.32 ±5% and 29.4 ±5% for 24 VDC. Consult factory for detailed current range for particular pressure setting.
Recommended Drivers: Dither Frequency: 200 Hz
PWM Frequency: 200 Hz
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: VC12-2; See page 9.112.1_2w
Cavity Tool: CT12-2xx; See page 8.600.1
Seal Kit: SK12-2x-B; See page 8.650.1
Coil Nut: 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




TS12-27 Valve Performance Chart


TS12-27 Performance curves



TS12-27 Valve Dimensions



Cartridge: Weight: 0.25 kg (0.56 lb);
Steel with hardened work surfaces.
Zinc-plated exposed surfaces; Buna N
O-rings and TFE back-ups standard.

Standard Ported Body: Weight: 0.36 kg
(0.8 lb); Anodized high-strength aluminum
alloy, rated to 207 bar (3000 psi); Ductile iron
bodies available; dimensions may differ.
See page 8.012.1_2w.

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.



TS12-27 Ordering Chart