Water Process Solutions Encore 700 - Valve and Diaphragm Replacement

To Next Page

To Previous Page

ENCORE

700 METERING PUMP

Valve and Diaphragm Replacement

NOTE: The 1-3/8", 2", 3", and 4"diaphragms utilize a circular back-up

ringscrewed onthe diaphragm insert. When replacing the diaphragm,

unscrew the back-up ring for reuse. A Teflon disc is inserted between

the diaphragm and the back-up ring. A new Teflon disc must be used

every time a new diaphragm is installed. For specific part numbers

on the diaphragm, back-up ring, and Teflon disc, refer to the Spare

Parts List in Section 6.

All O-rings must be lightly lubricated with silicone grease before assembly.

The assembly procedure for the cartridge or the threaded valves is the

reverse of the disassembly procedures described inparagraph 4.4.3. Refer

to Table 4.2 under head size for the corresponding torque to tighten the

clamping bolts for the cartridge valves.

Refer to Dwg. 440.050.001.030 for the 1-3/8" Diaphragm and Dwg.

440.050.001.040 for the 2" Diaphragm. Use the 2" Diaphragm drawing

as reference for all other sizes.

After the removal of the diaphragm assembly, as described in para-

graph 4.4.4, the bellow clamp (4) can be removed. On the 1-3/8" Dia-

phragm, the bellow clamp (3) is secured by a nut (4). The diaphragm

spacer (5), if used, can also be removed

Remove four screws (3) and slide out the adapter (1). On 1-3/8" Dia-

phragm, four long head bolts secure the adapter (1). Watch for the

O-ring between the adapter and the gearbox.

Pry off the old bellow seal (2) from the adapter and scrape the old

sealant from around the counterbore.

Clean the adapter thoroughly of oil with appropriate solvent, specially

the counterbore where the bellow seal will be glued.

Apply a 1/16" bead of RTV sealant along the corner of the counterbore.

Install the new bellow seal carefully and avoid smearing any RTV on

the folded surface of the bellow seal. Wipe off any excess RTV inside

and outside of the bellow seal.

Set aside, face up, and let the RTV sealant cure for a minimum of

three hours before continuing the assembly.

Recommended time

for RTV sealant to cure before filling the gearbox with oil is 12

hours.

NOTE: Adapters with bellow seals already glued and ready for as-

sembly to the pump are available. See Table 6.2 (in Section 6) for

kit number.

WT.440.400.001.UA.IM.1012