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A screw-in, cartridge-style, pilot-operated, spool-type hydraulic relief valve, which can be infi nitely 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.
The TS12-27 blocks flow from ➀ to ➁ until suffi cient pressure is present at ➀ to open the pilot section by overcoming the induced spring force. With no current applied, the
valve will relieve at ±50 psi of the range maximum. Applying current to the coil propor-
tionally decreases the pressure required to open the valve from ➀ to ➁Note: This valve is ideal for hydraulic fan drive applications. Consult factory for electronic controllers specifi cally designed for fan drive applications.
• Hardened parts for long life.
• 12 and 24 volt coils standard.
• Industry common cavity.
• Optional waterproof E-Coils rated up to IP69K.
Maximum Operating Pressure: 241 bar (3500 psi)
Maximum Control Current: 1.10 amps for 12 VDC coil; 0.55 amps for 24 VDC coil
Relief Pressure Range from Zero to Maximum Control Current:
A: 207–10.34 bar (3000–150 psi)
B: 138–10.34 bar (2000–150 psi)
C: 69–10.34 bar (1000–150 psi)
Rated Flow: 186.3 lpm (50 gpm), ΔP=16.4 bar (238 psi), Cartridge only,➀ to ➁ coil energized
Maximum Pilot Flow: 0.76 lpm (.2 gpm)
Hysteresis: Less than 3%
Flow Path: Free Flow: ➀ to ➁ coil energized; Relieving: ➀ to ➁ coil de-energized
Temperature: -40 to 120°C (-40 to 250°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: VC12-2; See page 9.112.1;
Cavity Tool: CT12-2XX; See page 8.600.1
Seal Kit: SK12-2X-B; See page 8.650.1
Coil Nut: Part No. 4540550; For E-coils manufactured prior to 1-1-04, see page 3.400.1">3.400.1">3.400.1 for coil nut info.
