Blagdon-pump B25 High Pressure W1 User Manual download pdf (Page 8)

b25_HP_W1_manual-rev1210

HG-CF-1197

HG-CF-1197 Rev. 0 - 15.12.09 Page 8

Read these instructions

c o m p l e t e l y , b e f o r e

installation and start-up. It

is the responsibility of the purchaser to

retain this manual for reference.

F a i l u r e t o c o m p l y w i t h t h e

recommendations stated in this

manual will damage the pump, and

void factory warranty.

IMPORTANT!

SERVICE

The following sections give a general

overview on how to service all

models of BLAGDON Diaphragm

Pumps. For details on individual part

numbers, quantities, materials, etc.,

please consult the parts list supplied

with the pump.

NOTE : Before commencing

any service or maintenance work

on the pump, ensure that the air

supply has been disconnected or

isolated.

AIR VALVE SYSTEMS

PNEUMATIC TYPE Remove the 4

screws securing the valve block to

the valve chest, together with any

associated gaskets or seals.

Remove slide valve plate & slide

valve from the valve block assembly.

Clean all parts thoroughly and

inspect for excessive wear, replacing

where necessary.

The slide valve and valve plate

contact faces should be flat and free

from scratches. A light polishing on a

flat surface with a fine abrasive paper

will remove most scratches.

If excessive wear is suspected in the

valve block bore or valve carrier,

remove the valve block plugs and

withdraw the valve carrier. Check

valve block plug o-rings for wear or

attack & replace where required.

Clean the valve carrier & valve block

bore with white spirits to remove any

oil films.

NOTE : T h e n o m i n a l

diametrical clearance between the

valve carrier and the valve block

block bore should be 0.05 -

0.09mm. A clearance in excess of

this will cause the valve system to

run erratically.

Apply a light grease to the valve

block plug O-rings when re-

assembling into the valve block bore.

Any damage to the O-ring may cause

the valve system to malfunction.

Re-assemble the valve block

assembly & re-torque in accordance

to the settings shown in the parts list.

In the event of a complete air-side

overhaul, the pump should be dis-

assembled down to the centre

section assembly as described later

in the “Wet-Side Overhaul” section.

With the valve block assembly

dismantled, remove the inner covers

where appropriate.

A careful note of the position of all

related seals and gaskets should be

made to facilitate re-assembly.

Remove diaphragm shaft bushes,

where appropriate, and check all

seals and ‘O’ rings for wear or

d a m a g e . I f w o r n , r e p l a c e

immediately.

NOTE:- The integrity of the

diaphragm shaft seals is essential

for the correct functioning of all

pneumatically actuated valve

systems.

Check the diaphragm shaft for

excessive wear as this will result in

premature seal failure. Replace as

required. Lubricate all components

and re-assemble as detailed above,

in reverse order. Ensure the correct

position of all components detailed in

all sectional assembly drawings.

WET-SIDE OVERHAUL

REPLAC I NG BALL VALVES

Remove discharge manifold from

pump assembly together with

associated valve balls, seats and ‘O’

rings.

NOTE :- The orientation of the

valve seat relative to the valve ball

should be noted as incorrect

positioning may result in a

performance loss.

Turn pump through 180

and remove

the suction manifold. Clean and

inspect the components. Check for

any wear or damage and replace as

required.

NOTE :- Ball or valve seat wear

may result in loss of performance

and suction lift.

Re-assemble the valve balls/seats

and ensure manifolds are adequately

torqued to the settings shown in the

parts list.

R E P L A C I N G D I A P H R A G M S

Remove both suction and discharge

manifolds as detailed in the previous

section, removing all ball valves,

seats and ‘O’ rings.

Loosen and remove both outer

covers from the pump assembly.

The orientation of the covers should

be noted so as to facilitate re-

assembly.

Holding one of the frontplates in a

vice, (‘soft jaws’ should be fitted), or

with an adjustable spanner, loosen

and remove the frontplate from the

opposite end. Remove the

diaphragm, backplate and bumpstop

from diaphragm shaft.

Carefully withdraw the diaphragm

shaft from the centre section and

hold the free end in a vice, holding

between the flats machined on the

end. Loosen and remove the

frontplate and remove the diaphragm

together with backplate and

bumpstop (where fitted).

NOTE :- Care should be taken with

all plastic, coated and hygienic

pumps, so that the surface of the

frontplate is not damaged.

Thoroughly clean all parts and check

for wear, damage, swelling, cracking,

delamination and chemical attack.

Replace components where required.

NOTE :- Rubber diaphragms

should be replaced if they are

worn to such an extent that the

fabric re-enforcing is evident on

the surface of the diaphragm.

For pumps fitted with PTFE

diaphragms, a light coating of grease

should be applied to the back-up

diaphragm prior to re-assembly.

Before re-assembly, it is advisable to

check the condition of the diaphragm

shaft seal/’O’ rings for wear or attack.

If either is evident, it is recommended

that they be replaced.

Assemble the diaphragms onto the

shaft in a reverse sequence to their

removal. Care should be taken as to

the orientation of the diaphragm

relative to the front and back plates.

All diaphragms have “AIR SIDE”

moulded onto one side. The

backplate must be fitted adjacent to

the AIR SIDE of the diaphragm.

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Blagdon-pump B25 High Pressure W1 User Manual Page 8

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