Step 2.
Figure 2
Remove muffl er plate and air valve
bolts from air valve assembly
exposing muffl er
gasket
for
inspection. Replace if necessary.
Step 3.
Figure 3
Lift away air valve assembly
and remove air valve gasket for
inspection. Replace if necessary.
Step 4.
Figure 4
Remove air valve end cap to expose
air valve spool by simply lifting up
on end cap once air valve bolts are
removed.
To o l s R e q u i r e d :
• 3/16" Hex Head
Wrench
• 1/4"
Hex
Head
Wrench
• Snap
Ring
Pliers
• O-Ring
Pic
AIR VALVE DISASSEMBLY:
CAUTION: Before any maintenance or repair is attempted, the compressed air line
to the pump should be disconnected and all air pressure allowed to bleed from the
pump. Disconnect all intake, discharge, and air lines. Drain the pump by turning it
upside down and allowing any fl uid to fl ow into a suitable container. Be aware of
hazardous effects of contact with your process fl uid.
The Wilden Plastic P4 and PX4 utilize a revolutionary Pro-Flo
®
air distribution system.
A 13 mm (1/2") [19 mm (3/4") for PX4] air inlet connects the air supply to the center
section. Proprietary composite seals reduce the co effi cient of friction and allow the
P4 / PX4 to run lube-free. Constructed of polypropylene or Acetal (P4 Only), the
Pro-Flo
®
air distri bution system is designed to perform in on/off, non-freezing, non-
stalling, tough duty applications.
Step 1.
Figure 1
Loosen the air valve bolts utilizing
a 3/16" hex head wrench and then
remove muffl er plate screws.
WILDEN PUMP & ENGINEERING, LLC
22
WIL-10161-E-01
S e c t i o n 7 B
PRO-FLO
®
AIR DISTRIBUTION SYSTEM (ADS) DISASSEMBLY
