Gasboy Atlas Start-up - Manual (Page 174)

Page 6-54 MDE-4334D Atlas™ Start-up and Service Manual · July 2013
Hydraulic/Mechanical Components Pumping Unit
Servicing Pressure Control Valve (PCV)
This section explains about servicing the pressure control valve.
Removing PCV
The purpose of the PCV is to apply a slight back pressure to the pumping unit, to prevent it
from pumping air through the meter (for example, during a dry tank situation). Meters will
meter air as well as fluid.
Excessive wear or a sticking PCV can cause improper pump performance, including flow loss,
excessive or low discharge pressure, or metering of air under a dry tank condition.
To remove a PCV, proceed as follows:
1 Drain the pumping unit. Refer to “Draining GPU” on page 6-51 .
2 Remove the snap ring (see Figure 6-29 ).
Figure 6-29: PCV
3 Turn the valve cover outward or counterclockwise using a 16 mm socket wrench until it is
completely removed.
Note: The cover is held on by bolts and not screwed in.
4 Remove the spring and valve.
5 Remove the valve from the bore using needle nose pliers.