Page 14 - Parker - L90LS Mobile directional control valve

Catalogue HY17-8504/UK Mobile Directional Control Valve
Inlet Section L90LS

Pressure relief valve [16]
The inlet section is normally equipped with a pressure relief valve
to protect the pump and valve from pressure peaks in the system
when there are rapid changes in the load pressure.
PA1 Direct-acting pressure relief valve with very fast opening
sequence and good pressure characteri stic. The inter-
changeable cartridge is factory set. The cartridge has a
make-up function, which means that oil is able to flow
from the tank gallery to the pump gallery in the event
of negative pressure in the pump circuit. The valve
is intended for the LS2 inlet section [15]. For setting
values, please see Pressure setting [17].

PA1 - Direct-acting pressure relief valve.

PLM Main relief valve in AS / AS2 [15] inlet section. Limits
the load signal pressure that is sent to the pump.

PLM – Pressure relief valve for inlet section AS and AS2.

PS Pilot-operated pressure relief valve with fast opening
sequence and very low pressure override, which effec-
tively prevents overloading of the hydraulic pump and
the machine. The valve is adjustable and is delivered
factory-set according to the value specified. The valve is
intended for the CFC and LS1 inlet sections [15].

Y Plug which can replace the pressure relief valve in the
LS2 inlet section [15]. The Y-plug blocks the connection
between the pump and tank completely.

/ Not machined for pressure relief valve.

PS – Pilot-operated pressure relief valve for inlet section CFC
and LS1.
14 Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden