Noblelift FE4P50N, Руководство по эксплуатации и обслуживанию

Страница: 45 / 105

44
1. Safety valve 2. Inching switch support 3. Spill pore 4. Lift timing sensor cover
figure 2-47 Multiway valve outline
(1) Operation of Slide valve (To tilting slide valve,for example)
(a) Neutral (figure 2-50)
In this case,high pressure liquid out of pump to tank through neutral
(b) Push slide valve in (figure 2-51)
Then, neutral chunnel is closed, liquid from oil inlet to open one-way valve flow to cylinder
joint B, liquid from cylinder joint A flow to tank through low pressure chunnel, supported by
rebound spring, slide valve can return to nertral.
figure 2-50 figure 2-51
(c) Draw slide valve out (figure 2-51)
Here close neutral, liquid from oil inlet to open one-way valve to flow to cylinder joint A, liquid
from cylinder B to flow to tank through low pressure chunnel, supported by rebound spring, slide
valve can return on neutral.
(2) Motion of safety flooding valve
There is a flooding valve between pump HP and low pressure chunnel “LP”. Pressure liquid
from lifting valve“c” play on piston A and piston B,witch is different area, to push both one-way
valve piston K and flooding lift valve piston D to locate on their valve seating respectively. Pressure
liquid of HP chunnel of pump play on spring of guide valve, one-way valve E can be opened.
Liquid flow into low pressure “LP” through holes around valve circumference.
If open guide valve E, inner pressure of valve C decrease, both piston of valve E and valve C
locate on their valve seating respectively. Inner pressure decrease because liquid which flow to
rear of valve D will be cut off.oil pump“HP”passageway is inbalance to inside pressure,under the
effect of differential pressure,valve“D”opens,and the oil flow directly to low tension loop.
Middle
way
Low-tensi
on way
slide
valve
Reversi
spring
oil-in A
filling one way
valve
oil-in B
oil-in