SANDPIPER DSB1 - Manual (Page 15)

Pilot Valve Assembly
LEGEND:
= Items contained within Air End Kits
Diaphragm Service Drawing
20
46
50
7
38
21
11
33
44
18
39
Torque:
350 in. lbs.
Step 1: With manifolds and outer chambers
removed, remove diaphragm assemblies from dia-
phragm rod. DO NOT use a pipe wrench or similar
tool to remove assembly from rod. Flaws in the rod
surface may damage bearings and seal. Soft jaws
in a vise are recommended to prevent diaphragm
rod damage.
Step 1.A: NOTE: Not all inner diaphragm plates
are threaded. Some models utilize a through hole in
the inner diaphragm plate. If required to separate dia-
phragm assembly, place assembly in a vise, gripping
on the exterior cast diameter of the inner plate. Turn
the outer plate clockwise to separate the assembly.
Always inspect diaphragms for wear cracks or
chemical attack. Inspect inner and outer plates for
deformities, rust scale and wear. Inspect intermediate
bearings for elongation and wear. Inspect diaphragm
rod for wear or marks.
Clean or repair if appropriate. Replace as required.
Step 2: Reassembly: There are two different types
of diaphragm plate assemblies utilized throughout the
Sandpiper product line: Outer plate with a threaded
stud, diaphragm, and a threaded inner plate.
Outer plate with a threaded stud, diaphragm, and
an inner plate with through hole. Secure threaded
inner plate in a vise. Ensure that the plates are being
installed with the outer radius against the diaphragm.
Step 3: Lightly lubricate, with a compatible material,
the inner faces of both outer and inner diaphragm plates
when using on non Overlay diaphragms (For EPDM
water is recommended). No lubrication is required.
Step 4: Push the threaded outer diaphragm
plate through the center hole of the diaphragm.
Note: Most diaphragms are installed with
the natural bulge out towards the fluid side.
Step 5: Thread or place, outer plate stud into
the inner plate. For threaded inner plates, use a
torque wrench to tighten the assembly together.
Torque values are called out on the exploded view.
Repeat procedure for second side assembly. Allow
a minimum of 15 minutes to elapse after torqu-
ing, then re-torque the assembly to compensate
for stress relaxation in the clamped assembly.
Step 6: Thread one assembly onto the diaphragm
rod with sealing washer (when used) and bumper.
Diaphragm Servicing
IMPORTANT
Read these instructions completely,
before installation and start-up.
It is the responsibility of the
purchaser to retain this manual for
reference. Failure to comply with
the recommendations stated in this
manual will damage the pump, and
void factory warranty.
Step 7: Install diaphragm rod assembly into
pump and secure by installing the outer cham-
ber in place and tightening the capscrews.
Step 8: On opposite side of pump, thread the
remaining assembly onto the diaphragm rod. Us-
ing a torque wrench, tighten the assembly to the
diaphragm rod. Align diaphragm through bolt holes,
always going forward past the recommended torque.
Torque values are called out on the exploded view.
NEVER reverse to align holes, if alignment cannot
be achieved without damage to diaphragm, loosen
complete assemblies, rotate diaphragm and reas-
semble as described above.
sb1dl5sm-rev0614
sandpiperpump
.
com Model SB1 & SB25 •
12
5: WET END