Hydraulics - Seafish
Hydraulics - Seafish
Hydraulics - Seafish
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Spring<br />
Pilot valve<br />
Pressure adjusting<br />
Hand wheel<br />
Piston<br />
Pressure line<br />
Main valve<br />
Drain<br />
iTo tank<br />
Figure 8.<br />
The small hole in the main valve piston allows high pressure oil<br />
into the space above the piston. When the pressure in the line is<br />
too high, this pressure opens the pilot valve which allows the oil<br />
to pass down through the central hole in the main valve piston<br />
and into the passage below the main valve. Since this passage is<br />
open to the tank, the pressure above the main piston will be less<br />
than the pressure below, the main valve piston will lift and the<br />
main valve will allow full flow from the pressure line into the<br />
tank.<br />
When the pressure in the pressure line falls to the normal value<br />
the pilot valve closes and pressure increases in the space above<br />
the main valve piston. This will then cause the main valve to<br />
close the drain passage. Turning the handwheel will adjust the<br />
pressure in the line at which the relief valve opens.<br />
<strong>Seafish</strong> Open Learning
Change language