All 1DX.MIST, 2DX, 2DX.MIST and 3DX Models
Discharge and Inlet Valve Assembly - Stacked Valve design
3SP30G1I, 3SP35GEI, 3SPX30G1I, 3SPX35GEI
Discharge and Inlet Valve Assembly - Stacked Valve design
SERVICING THE VALVES
Disassembly
NOTE: All pump models require one (1) stacked valve
kit to repair pump. Models 2DX, 2DX.MIST, 3DX, 3DNX,
3SP and 3SPX contain three complete valve assemblies
(inlet and discharge). Whereas, model 1DX03ELS.MIST
contains two complete valve assemblies and model
1DX015ELS.MIST contains one complete valve assembly.
NOTE: Discharge and inlet valve assemblies may stay
together or separate during removal.
NOTE: Spring retainer may also separate from the seat
during removal.
1.
Models 1DX.MIST, 2DX, 2DX.MIST and 3DX: Use a M19
Hex tool to remove valve plugs on top of manifold.
Models 3DNX, 3SP and 3SPX: Use a M24 Hex tool to
remove valve plugs on top of manifold.
2.
Use a reverse pliers to remove stacked valve assemblies
from the valve chamber.
3.
If the discharge valve assembly separates from the inlet
valve assembly, use a reverse pliers to remove it from the
valve chamber.
CAUTION: Exercise caution as the reverse pliers may
damage the threads in valve chamber or spring retainer.
4.
Models 1DX.MIST, 2DX, 2DX.MIST and 3DX: The spring
retainer may separate from the seat. Remove the spring
and valve from the valve chamber. Thread an M8 screw
into the seat and remove from valve chamber.
5.
Models 1DX.MIST, 2DX, 2DX.MIST and 3DX: Separate
valve assembly by using the same M8 screw and thread
into bottom of seat until screw contacts bottom of valve.
Continue threading in screw until spring retainer separates
from seat.
Models 3DNX, 3SP and 3SPX: Separate valve assembly
by inserting screwdriver into spring retainer and press the
backside of valve until seat separates from the spring
retainer.
6.
Remove o-ring from each seat and valve plug.
Reassembly
1.
Examine spring retainers for internal wear or breaks in the
structure and replace as needed.
2.
Examine springs for fatigue or breaks and replace as needed.
3.
Examine valves and seats for grooves, pitting or wear and
replace as needed.
4.
Examine seat and valve plug o-rings for cuts or wear and
replace as needed.
NOTE: Inlet valve seat and o-ring are different from dis-
charge valve seat and o-ring. One valve kit required per
pump.
5.
Models 1DX.MIST, 2DX, 2DX.MIST and 3DX: Lubricate
and install new o-ring onto large outside diameter of dis-
charge seat.
Models 3DNX, 3SP and 3SPX: Lubricate and install back-
up-ring, and then o-ring onto large outside diameter of dis-
charge seat.
6.
Place seat on work surface with small diameter side up.
7.
Place valve onto seat with concave side down.
8.
Place spring on valve.
9.
Install spring retainer with deep stepped end over spring
and snap onto seat.
NOTE: Repeat steps 6-9 for inlet valve assembly.
10. Snap discharge valve assembly onto the inlet valve
assembly and press into valve chamber until completely
seated.
11. Lubricate and install new o-ring onto each valve plug.
12. Apply Loctite® 242® to threads of each valve plug and
thread in hand tight. Torque to specifications per chart.
CAUTION: Before commencing with service, shut off drive (electric motor, gas or diesel engine) and turn off water supply to pump. Relieve all dis-
charge line pressure by triggering gun or opening valve in discharge line.
After servicing is completed, turn on water supply to pump, start drive, reset pressure regulating device and secondary valve, read system pressure on
the gauge at the pump head. Check for any leaks, vibration or pressure fluctuations and resume operation.
Inspect and service all system accessories on the same schedule as your pump.
