Thermal Bypass Assembly

Requiring fast warm-up, controlled fluid temperature, and low return line back pressure, this thermal bypass valve is ideally suited for hydrostatic drive circuits. This device will modulate fluid temperature by either shifting return line flow through the cooler, or bypassing directly to the reservoir. A built-in pressure relief function automatically relieves excess pressure to the reservoir should the cooler become restricted and resultant pressure drop become to high for the cooler circuit.

• Specifications
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  Mechanical

  Standard Shift Temperatures	100°F (38°C) | 120°F (49°C) | 140°F (60°C) | 160°F (71°C)	-
  Full Shift (Cooler Port Open) Temperatures	Shift temperature plus 25°F (14°C)	-
  Relief Valve Setting	65 psi (4.5 bar)	Consult factory for other pressure settings.
  Maximum Operating Pressure	250 psi (17 bar)	-
  Proof Pressure	300 psi (21 bar)	-
  Minimum Burst Pressure	Up to the full shift temperature: 325 psi (22 bar)	Above the full shift temperature: 600 psi (41 bar)
  Minimum Operating Temperature	-30°F (-34°C)	-
  Maximum Operating Temperature	Shift temperature plus 75°F (24°C)	-
  Maximum Flow Rating	60 GPM (227 LPM)	-
  Leakage at 250 psi (17 bar) and 60 GPM (227 LPM Inlet Flow	Cooler Port: 0.5 GPM (2 LPM) maximum up to 5°F (3°C) before shift temperature	-
  	Cooler Port: 1.0 GPM (4 LPM) maximum from 5°F (3°C) before shift to shift	-
  	Tank Port: 0.10 GPM (0.4 LPM) maximum	-
  Operating Fluid	Mineral base hydraulic fluids	-
  Construction	Aluminum die-cast housing	-

  Operating Characteristics

  Mode 1	At temperatures below the shift temperature oil flows from inlet to tank port.	-
  Mode 2	At temperatures between the start of shift and full shift the flow from the inlet port is divided between the cooler and tank ports.	-
  Mode 3	At temperatures above the full shift temperature inlet flow is through the cooler port.	-
  Mode 4	At temperatures above the full shift temperature the excess pressure is relieved through the tank port.	-

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