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RELIEF VALVES0 pages
Pub. EC-0201
RELIEF VALVES
Remote Control / Direct Type
Pilot Operated / Solenoid Controlled
PRESSURE
CONTROLS
Up to 25 MPa (3630 PSI), 400 L/min (106 U.S.GPM)
Remote Control Relief Valves ..................... Page 3
C
This valve is used as a remote control valve for pilot operated type
pressure control valves.
Direct Type Relief Valves ............................ Page 6
This valve is used in a hydraulic circuit to prevent damage due to
over pressure and to adjust the maximum circuit pressure of small
capacity.
Pilot Operated Relief Valves ....................... Page 9
These valves protect the hydraulic system from excessive
pressure, and can be used to maintain constant pressure in a
hydraulic system. Remote control and unloading are permitted by
using vent circuits.
Low Noise Type
Pilot Operated Relief Valves ....................... Page 16
Pilot operated relief valves here have been particularly developed as low-noise types. Able to protect pumps and control valves
against excessive pressures, they are used to control the pressure
in the hydraulic system to a constant level. Remote control and
unloading are permitted by using vent circuits.
Solenoid Controlled Relief Valves .............. Page 20
These valves are a combination of a pilot operated relief valve
and a solenoid operated directional valve. Piping between the
two is eliminated as the solenoid valve is directly mounted on
the relief valve and connected with the relief valve vent. Pump
pressure may be unloaded remotely by an electrical signal to the
solenoid, or by connecting pilot relief valves to the solenoid
valve ports.
"A"
Low Noise Type
Solenoid Controlled Relief Valves .............. Page 31
The low-noise solenoid controlled relief valve is a combination
of a low-noise type pilot operated relief valve and a solenoid
operated directional valve. It is used for no-load pump operation
by using electric signals or, together with a remote control relief
valve, for two or three pressure control of the hydraulic system.
"B"
b
a
"A"
a
"B"
b
No.1
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