Pressure Reducing (& Check) Valves0 pages

Pub. EC-0203

PRESSURE REDUCING (AND CHECK) VALVES
RT/RG
RCT/RCG -03/06/10 (3/8, 3/4, 1-1/4)
Threaded Connections / Sub-plate Mounting

PRESSURE
CONTROLS

Up to 21 MPa (3050 PSI), 500 L /min (132 U.S.GPM)

Pressure Reducing Valves

Pressure Reducing and Check Valves

Pressure reducing valves are used to set the pressure of
a hydraulic circuit below that of the main circuit. In
addition, operation under remote control is possible by
using the remote control port.

Pressure reducing and check valves are used to set the
pressure of a hydraulic circuit below that of the main
circuit. They have check valves, which allow a free
flow from the secondary side to the primary.
Operation under remote control is also possible by using
the remote control port.

Hydraulic Fluids
Fluid Types
Any type of hydraulic fluid listed in the table below can be used.
Petroleum base oils
Synthetic fluids
Water containing fluids

Use fluids equivalent to ISO VG 32 or VG 46.
Use phosphate ester or polyol ester fluid. When phosphate ester fluid is used, prefix "F-" to the
model number because the special seals (fluororubber) are required to be used.
Use water-glycol fluid.

Note: For use with hydraulic fluids other than those listed above, please consult your Yuken representatives in advance.

Recommended Viscosity and Oil Temperatures
Viscosity ranging between 15 - 400 mm2/s (77 - 1800 SSU).
Oil temperatures between -15/+70°C (5 - 158°F).
Use hydraulic fluids which satisfy the recommended viscosity and oil temperatures given above.
Control of Contamination
Due caution must be paid to maintaining control over contamination of the hydraulic fluids which may otherwise
lead to breakdowns and shorten the life of the valves. Please maintain the degree of contamination within NAS 1638Grade 12. Use 25 μ m or finer line filter.

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