Directional Control Valve P70 - Oleosistemas

Catalogue HY17-8546/UK
Inlet Section
Directional Control Valves
P70
Tank connection, T2 [25]
Pump connection, P2 [27]
Parallel connection, L [27]
Main pressure relief
valve [16]
Pump connection,
P1 [26]
Standard inlet section
The inlet section comes in two basic versions: the standard
version and a version with pump unloading.
The standard inlet section has two pump connections, P1 and
P2, and a tank connection T2. The inlet section also contains the
pilot-operated main pressure relief valve, in which either the UL
connection for external pump unloading or the multi-level pressure
relief function are located (see page 17).
The P70 with closed centre (P70CP) is created by combining
inlet I with L or CUI at item [27]. P70LS shall always use the
L option at item [27]. The difference between the P70CP and
P70CF is that, in the P70CP, the open centre is used to break a
hydraulic signal rather than to convey unused pump flow to tank.
P70LS is using the open centre gallery for the load signal from
the work port to the variable pump.
Type of inlet section [15]
I
IU
Standard inlet.
Inlet with integrated pump-unloading function
(P70CF only).
P2
P2
P1B
P1
UL
T2
T2
Standard inlet I without main
pressure relief valve (P70CF).
Standard inlet I with L-function
and main pressure-relief function
PS (P70CP, P70LS).
14 Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden