Operating The Valve; Adjustment; Operating Environment - YUKEN KOGYO ELDFG-01EH 10 Series Instruction Manual

6. Operating the valve

6.1 Adjustment

● The neutral position of the valve spool has been adjusted. Do not disassemble the valve to
adjust the neutral position.
● All trimmers for the on-board amplifier are set by default. If the adjustment of the neutral
position of the valve spool is required for the actual load conditions, perform NULL
adjustment as described in 5.1.

6.2 Operating environment

● Use this product for hydraulic circuit switching and speed/pressure adjustment for hydraulic
equipment.
● To ensure the stable operation of the valve and the hydraulic circuit, bleed air completely
from the hydraulic circuit.
● The valve may be used without air bleeding. If air bleeding is necessary, loosen the air vent
to release air and make sure that the solenoid is filled with the hydraulic fluid. Note that air
bleeding should be performed in unload condition.
● Take appropriate measures to protect the valve cable against noise. Using a cable longer
than the specified length may interfere with the stable performance of the valve.
● Provide a separate safety circuit, if necessary, to securely hold/stop the hydraulic actuator for
safety at the time of immediate shutdown or startup of hydraulic equipment.
● Do not operate the valve when the tank port is dry. If the tank port is dry, the inside of the
solenoid core is not filled with the hydraulic fluid, resulting in unstable valve operation and/or
solenoid failure.
● Do not connect the tank port to any line that generates a surge pressure. Doing so may
cause malfunction or failure of the valve.
● Be sure to fill the tank port "T" with the hydraulic fluid. Providing a check valve with a
cracking pressure of about 0.04 MPa is recommended to take back pressure.
connect the tank pipes to other lines, but connect them directly to the reservoir.
● For environmental requirements, such as water resistance and vibration conditions, refer to
"Vibration Proof" and "Protection" in the specification table in 2.2 "Specifications".
● Meet the requirements for fluid viscosity and temperature specified in 6.3.2. Operate the
valve at an ambient temperature of 0 to 50 °C under non-condensing conditions.
● Be sure to use the valve in the operating environment (ambient temperature, etc.) specified
in this manual. Failure to do so may interfere with proper operation.
CAUTION
(1) The product has a structure involving internal leakage. This internal leakage
sometimes activates the actuator.
(2) The valve may generate electrical noise from its solenoid. Be aware that
such noise may affect surrounding electronic devices.
(3) The valve may become excessively heated during operation.
touching the valve (solenoid, in particular) during operation or immediately
after the end of operation. Failure to do so may result in burn.
(4) When operating the product manually, ensure safety by taking precautionary
measures, e.g. keeping people away from the moving parts of equipment.
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EM-1359
Do not
Avoid