Page 15 - Parker - L90LS Mobile directional control valve

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

Pressure setting [17]
Pressure setting for PA1 [16] Pressure setting for PS [16]
The direct-acting pressure relief valve, PA1, is delivered The pilot-operated pressure relief valve, PS, is adjust-
with a fixed setting. The following standard settings are able from 50 to 320 bar. The valve can, however, be
available: delivered with a fixed setting according to the value
Pressure setting in bar: 63, 80, 100, 125, 140, 160, 175, specified.
190, 210, 230, 240, 250, 260, 280, 300 and 320.

∆p (bar) Pressure relief characteristics ∆p (bar) Pressure relief characteristics

400 400

300 300

200 200

100 100

0 0
0 50 100 150 200 0 50 100 150 200
q (l/min) q (l/min)
PA1 - Direct acting pressure relief valve. PS - Pilot-operated pressure relief valve.

Differential pressure limiter, PLS [18]
20-38 Function which maximize the pressure difference
between the pump pressure and the load signal from
the spool sections in inlet section AS [15]. The differen-
tial pressure must be set slightly higher in the inlet than
in the pump regulator itself, approx. 5-8 bar.

PLS - limiting function which maximise the differential pressure
between the pump pressure and the load signal.

15 Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden