New Holland PL6011, Service Manual

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Hydraulic systems - Hydraulic systems
Hydraulic systems - Hydraulic symbol - Pressure control
PL6011 11 Rows, 45cm, Model year 2017 LA
PL6013 12 Rows, 50cm, Model Year 2017 LA
PL6013 13 Rows, 45cm, Model Year 2017 LA
PL6015 14 Rows, 50cm, Model Year 2017 LA
PL6015 15 Rows, 45cm, Model Year 2017 LA
PL6017 16 Rows, 50cm, Model Year 2017 LA
PL6017 17 Rows, 45cm, Model Year 2017 LA
PL6019 17 Rows, 50cm, Model Year 2017 LA
PL6019 19 Rows, 45cm, Model Year 2017 LA
PL6024 22 Rows, 45cm, Model Year 2017 LA
PL6024 22 Rows, 50cm, Model Year 2017 LA
PL6024 24 Rows, 45cm, Model Year 2017 LA
PL6028 24 Rows, 50cm, Model Year 2017 LA
PL6028 28 Rows, 45cm, Model Year 2017 LA
PL6032 28 Rows, 50cm, Model Year 2017 LA
PL6032 32 Rows, 45cm, Model Year 2017 LA
PL6036 32 Rows, 50cm, Model Year 2017 LA
PL6036 36 Rows, 45cm, Model Year 2017 LA
The basic valve symbol is a square (which is called an
envelope) with external port connections and an arrow
inside to show the fluid passage and direction of flow. The
valve usually operates by balancing fluid pressure against
a spring, so a spring is shown on one side of the symbol
and a pilot pressure line on the other side.
Normally closed valve
A normally closed valve, such as a relief or sequence
valve, is shown with an arrow offset from the ports [in-
let
(A) , outlet (B) ] toward the pilot pressure line (C) side
of the square. The spring (D) holds the valve closed until
the pilot line pressure is greater than the spring pressure.
Mentally visualize a build up of pressure in the pilot line
and the envelope moving over, compressing the spring.
Fluid can now flow through the valve.
RCIL07CCH059AAA
1
Normally open valve
A normally open valve is shown with the arrow connecting
the inlet and outlet ports. It closes when pressure over-
comes spring force. Mentally visualize a build up of pres-
sure in the pilot line and the envelope moving over, com-
pressing the spring. Fluid flow through the valve is now
blocked.
RCIL07CCH060AAA
2
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