Sandpiper SB25 User Manual download pdf (Page 18)

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15 • Model SB1 & SB25

Step 1: With manifolds and outer chambers

removed, remove diaphragm assemblies from

diaphragm 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

diaphragm 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. S05,

S07, and S10 non–metallic units are installed

with the natural bulge in towards the air 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

torquing, 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.

Step 7: Install diaphragm rod assembly

into pump and secure by installing the outer

chamber in place and tightening the capscrews.

Step 8: On opposite side of pump, thread the

remaining assembly onto the diaphragm rod. Using 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 reassemble as

described above.

Step 9: Complete assembly of entire unit.

One Piece Diaphragm Servicing (Bonded PTFE

with integral plate) The One Piece diaphragm has

a threaded stud installed in the integral plate at the

factory. The inner diaphragm plate has a through

hole instead of a threaded hole. Place the inner

plate over the diaphragm stud and thread the rst

diaphragm / inner plate onto the diaphragm rod only

until the inner plate contacts the rod. Do not tighten. A

small amount of grease may be applied between the

inner plate and the diaphragm to facilitate assembly.

Insert the diaphragm / rod assembly into the pump

and install the outer chamber. Turn the pump over

and thread the second diaphragm / inner plate onto

the diaphragm rod. Turn the diaphragm until the

inner plate contacts the rod and hand tighten the

assembly. Continue tightening until the bolt holes

align with the inner chamber holes. DO NOT LEAVE

THE ASSEMBLY LOOSE.

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.

MODEL SPECIFIC

5: WET END

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Sandpiper SB25 User Manual Page 18

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