Blagdon Pump 25 Series User manual

HG-CF-1101 Rev. C – 19.05.06 Page 1
B25 & X25
B25 & X25B25 & X25
B25 & X25
25 Series 1” Models
This pump is Atex approved for use
in potentially explosive atmospheres
Group II category 2
SERVICE & OPERATING MANUAL
SERVICE & OPERATING MANUALSERVICE & OPERATING MANUAL
SERVICE & OPERATING MANUAL
AIR OPERATED DOUBLE DIAPHRAGM PUMP
All models, BSP
Flanged models :- 1” ANSI 150.
Atex Certified models.
NOTE! Refer to pump Typical Code matrix on page 6 to determine the full Model No. of your
pump.
Please read all warnings and instructions before using this product.
IMPORTANT
This pump should be used in accordance with the requirements of the Health and Safety at Work Act 1974.
All business conducted subject to Blagdon Pump. Terms and Conditions of Sale, available on request.
A Unit of IDEX Corporation
II 2 GD c
5747031783
B2500T5…. Virgin PTFE / HDPE
X250044…. All Conductive PTFE
This Manual covers the following models :-

HG-CF-1101 Rev. C – 19.05.06 Page 2
Contact Phone / E-Mail / Fax No.
Contact Information
LAMBERT ROAD,ARMSTRONG, WASHINGTON,
TYNE & WEAR NE37 1QP, ENGLAND.
TEL. : [phone]
FAX. : [phone]
Web Site : www.blagdonpump.com
E-Mail : [e-mail]
Table of Contents
Contact Information 2
Important warnings and Safety Information 3
Principle of Pump Operation 4
Installation guide 4
Trouble Shooting 5
Technical Data 5
Temperature Limitations 6
Explanation of Pump Nomenclature 6
Dimension drawing - Standard 7
Dimension drawing - Flanged 7
Parts List 8
Expolded View 9
Flanged Manifold Table 10
High Temperature Specification 10
Exhaust Safety Instructions 10
Performance Curve / Re-Assembly of Outer Covers 11
Warranty 12
Service 12
Air Side Overhaul 12
Wet Side overhaul 12
Atex Certified models, Grounding the pump 13
Wet Side Kit structure & Spares Kits 14
Service / Maintenance Log 15
Recycling 15
Declaration of Conformity 16

HG-CF-1101 Rev. C – 19.05.06 Page 3
Before pump operation, inspect all gasketed fasteners for looseness caused by gasket creep. Re-torque loose fasteners to prevent
leakage. Follow recommended torques stated in this manual. In cases of excess vibration, Blagdon recommend fitting a Pulsation
Dampener to remove effects of pulse actions from pump operation. Flexible connections can be used, but must be kept to a minimum
length necessary to avoid sharp flexing or straining movements.
CAUTION!
When used for toxic or aggressive fluids, the pump should always be flushed clean prior to disassembly. User must ensure chemical
compatibility, and any pressure / temperature limits are not exceeded. These instructions include all the information for relevant
diaphragm temperature limits. Pump temperature range can also be found on data-plate attached to the pump.
If pump is not used for more than 5 days, care must be taken when restarting. If in any doubt, remove pump from line and flush with a
suitable cleaner. Solidified deposits within the pump may cause damage to the diaphragms.
WARNING!
Important Warnings and Safety Information
This pump is pressurized internally with air pressure during operation. Always make certain that all bolting is in good condition and that
all of the correct bolting is reinstalled during assembly. End-user must ensure correct fitting of Inlet / Outlet connections. Crossed
threads or over tightening of connections will result in leaks. Quick action/release connections are not recommended. If their use is
unavoidable, the levers must be locked to avoid them being forced apart in a hazardous manner.
WARNING!
Before doing any maintenance on the pump, be certain all pressure is completely vented from the pump, suction, discharge, piping, and
all other openings and connections. Be certain the air supply is locked out or made non-operational, so that it cannot be started while
work is being done on the pump. Be certain that approved eye protection and protective clothing are worn at all times in the vicinity of
the pump. Failure to follow these recommendations may result in serious injury or death.
WARNING!
Before maintenance or repair, shut off the compressed air line, bleed the pressure, and disconnect the air line from the pump. The dis-
charge line may be pressurized and must be bled of its pressure. End-user must ensure correct regulation of air supply pressure, as any
increase in air pressure results in a similar increase in product pressure if stalled-out.
WARNING!
Airborne particles and loud noise hazards. Wear ear and eye protection.
WARNING!
Take action to prevent static sparking. Fire or explosion can result, especially when handling flammable liquids. The pump, piping,
valves, containers or other miscellaneous equipment must be grounded. Refer to exhaust safety instructions on page 10.
WARNING!
Read these safety warnings and instructions in this manual completely, before installation and start-up of the pump. It
is the responsibility of the purchaser to retain this manual for reference. This manual must be kept with, and supplied
with the pump at all times. Failure to comply with the recommendations stated in this manual will damage the pump,
and void factory warranty. These instructions are available if required, in the language or languages of the country or
countries in which the equipment is used. Please refer to the manufacturer for details.
IMPORTANT

HG-CF-1101 Rev. C – 19.05.06 Page 4
PRINCIPLE OF PUMP
OPERATION
This ball valve type diaphragm pump is
powered by compressed air and is a 1:1 ratio
design. The inner side of one diaphragm
chamber is alternately pressurised while
simultaneously exhausting the other inner
chamber. This causes the diaphragms, which are
connected by a common shaft secured by plates
to the centres of the diaphragms, to move in a
reciprocating action. (As one diaphragm
performs a discharge stroke the other diaphragm
is pulled to perform the suction stroke in the
opposite chamber.) Air pressure is applied over
the entire inner surface of the diaphragm while
liquid is discharged from the opposite side of
the diaphragm. The diaphragm operates in a
balanced condition during the discharge stroke
which allows the pump to be operated at
discharge heads of over 200 feet (61 meters) of
water.
For maximum diaphragm life, keep the pump as
close to the liquid being pumped as possible.
Positive suction head in excess of 10 feet of
liquid (3.048 meters) may require a back
pressure regulating device to maximize
diaphragm life.
Alternate pressurising and exhausting of the
diaphragm chamber is performed by an
externally mounted, pilot operated, 2 way type
distribution valve. When the spool shifts to one
end of the valve block body, inlet pressure is
applied to one chamber and the other diaphragm
chamber exhausts. When the spool shifts to the
opposite end of the valve body, the pressure to
the chambers is reversed. This alternating
movement of the spool inside the valve body is
controlled by a pilot air pressure signal held
against the diaphragm shaft, between seals in the
diaphragm shaft bushes. This signal is released,
triggering the movement of the spool, when pilot
holes in the diaphragm shaft align with the held
pilot signal, sending the signal to exhaust, which
in-turn causes a pressure imbalance around the
spool, sending it to the opposite end of the valve
body. This simultaneously sends inlet pressure
to the opposite chamber.
The chambers are connected by manifolds with a
suction and discharge ball valve for each
chamber, maintaining flow in one direction
through the pump.
INSTALLATION
The typical installation shown in FIG. 1 is only a
guide to selecting and installing system
components. Your installation will depend on
the type of fluid being pumped and your
application needs. To reduce the risk of serious
bodily injury and damage to property, never use
fluids in this pump which are not compatible
with the wetted components. Contact your local
distributor or the manufacturer for system design
assistance & compatibility if necessary.
Mount the pump in an upright position. Failure
to ensure an upright position may result in loss
of or poor priming characteristics. Ensure the
pump is securely mounted to avoid movement
and possible risk of bodily injury.
PRESSURE The pump delivers the same
pressure at the discharge outlet as the air
pressure applied at the air inlet (unless pump is
configured as a 2:1 ratio model).
NOTE: Pressure Regulator (H) should be
installed where air supply could exceed 125
psi.
SAFETY
Your BLAGDON PUMP is a high performance
unit capable of achieving high outputs at high
efficiencies. However, as is common with
pneumatic equipment, the pump efficiencies is
reliant upon the air being clean, dry and filtered.
Failure to comply with these requirements may
lead to loss of performance and reduced
component life and in extreme cases, permanent
damage to the pump.
To avoid leaks, ensure that all fluid connections
are tight. The use of PTFE thread tape correctly
applied should be used to ensure 100% leak
proof connections. Failure to ensure 100%
sealability of the suction connection could
adversely affect suction performance.
If you are pumping hazardous fluids, or
operating the pump in an enclosed area, it is
essential that the exhaust from the pump is
piped away to a safe location. When pumping
hazardous fluids the above instructions must be
adhered to in order to ensure safe operating
procedures. (Under certain operating
conditions the failure of internal components
can lead to the pumped fluid being exhausted
via the pump exhaust outlet).
WARNING
NEVER place your hands over or near the
pump suction inlet. Powerful suction could
cause serious bodily injury.
FLUSH THE PUMP This pump was tested
with water containing an oil-based rust
inhibitor. If this solution could contaminate or
react with the fluid you are pumping, flush the
pump thoroughly with a solvent/detergent to
clean internal components. The solvent/
detergent must be compatible with the pump
materials of construction. Care should be taken
to flush the pump each time it is disassembled
for maintenance or repair.
CAUTION
All BLAGDON PUMPS are built lubricated
with grease during assembly and need no
further lubrication. If the use of oil cannot be
avoided, this will not present any problems. A
light No. 2 class lithium grease is
recommended. Other grades may cause the Air
Logic System to operate intermittently, thereby
causing a loss of output and failure to operate.
Other seals are available for “clean room”
conditions
If the pump accelerates or is running too fast
due to a lack of fluid, then stop it immediately
by shutting off the air supply. A dry pump will
accelerate to a high speed causing wear to
elastomers.
If the fluid you are pumping tends to dry up or
set when it is not moving, then flush the pump
as often as necessary to prevent the fluid from
drying in the pump. Drain the pump thoroughly
before storing.
If feasible, invert pump to allow any fluid to
drain from the non-return valves.
Pipe Connection
(Style Optional)
Air
Gauge
Shut-off
Valve
Drain Port
SUCTION
Filter
Connection
Flexible
Flexible
Connection
Pipe Connection
(Style Optional)
Gauge Shut-off
Valve
Drain Port
DISCHARGE
Pulsation
Dampener
Regulator/Lubricator
Air Shut-Off
Valve
Air Dryer
INLET
Air Inlet
Air Exhaust
AIR
Exhaust
1
23
4
Installation Guide
Fig. 1
Available from
Blagdon Pump :-
1. Pulsation Dampener
2. Filter/Regulator
3. Lubricator
4. Air Dryer
 CAUTION !
The air exhaust should be piped
to an area for safe disposition of
the product being pumped, in the
event of diaphragm failure.

HG-CF-1101 Rev. C – 19.05.06 Page 5
TROUBLE SHOOTING GUIDE
NOTE :- Check all solutions before dismantling the pump.
PROBLEM CAUSE SOLUTION
Pump will not start Air valve assembly malfunction/Seizure
Obstructed fluid line.
Obstructed diaphragm chamber.
Diaphragm failure causing fluid & excessive air to be
expelled through the exhaust.
Diaphragm seal failure.
Air valve system malfunction.
Air connected to exhaust.
Check carrier for freedom of movement. -
Clean, oil & replace.
Clean line or increase line size.
Remove obstruction.
Replace diaphragm.
Replace shaft seals.
Check all seals in valve chest assembly.
Re-connect to air inlet.
Erratic flow Diaphragm failure on one side.
Valve ball not seating.
Suction leakage.
Diaphragm failure causing fluid & excessive air to be
expelled through the exhaust.
Diaphragm seal failure.
Air valve system malfunction.
Replace diaphragm.
Check and remove obstruction.
Check and correct.
Replace diaphragm.
Replace shaft seals.
Check all seals in valve chest assembly.
Pump strokes but will not
discharge Excessive suction lift. Suction line leakage.
Valve ball not seating correctly or damaged.
Suction line or strainer clogged.
Diaphragm failure.
Shorten suction line.
Check and correct.
Check and remove obstruction / replace.
Clear.
Replace diaphragm.
Fluid discharged from air
exhaust Diaphragm Failure. Loose frontplate. Replace diaphragm. Re-Torque to manual specifications.
Intermittent stroke rate Over lubrication
Diaphragm shaft seal failure.
Air valve system malfunction.
Valve ball not seating / partially obstructed.
Shut-down pump. Remove air connection
into pump & introduce a small quantity of de-
greasing agent into air valve and replace
line. Run pump until clear.
Replace seals.
Check all seals in valve chest assembly.
Clear obstruction.
Trouble Shooting Guide & Technical Data
TECHNICAL DATA
FLUID CONNECTIONS CAPACITY MAX SOLIDS MAX DISCHARGE HEAD DISPLACEMENT
PER STROKE
1” BSP (F)
1” ANSI 150 FLANGE 0 - 136 Litres/Minute (0 - 30 Gallons/Minute) 3 MM (1/8”) 70 Meters (230 ft) 0.475 Litres (0.1 UK Gallons)
MAX. WORKING PRES-
SURE AIR INLET TEMPERATURE LIMITS PUMP WEIGHTS :-
7.0 Bar (100 psi) 3/8” BSP (F)
3/8” NPT (F) 1000 C PTFE & Conductive PTFE T5 : 37 Kg
44 : 40 Kg
For overall dimensions see page 7

HG-CF-1101 Rev. C – 19.05.06 Page 6


Caution - Operating temperature limitations are as follows: Operating Temperatures
Materials Maximum Minimum Optimum
Buna-n - General purpose, oil resistant. Shows good solvent, oil, water and hydraulic fluid resistance. Should not
be used with highly polar solvents like acetone and MEK, ozone, chlorinated hydrocarbons and nitro hydrocarbons. 176oF
80oC -18oF -28oC 50oto 140oF 10oto 60oC
EPDM - Shows very good water and chemical resistance. Has poor resistance to oils and solvents, but is fair on
ketones and alcohols. 212oF
100oC -11oF -24oC 50oto 212oF 10oto 100oC
Neoprene - All purpose. Resistant to vegetable oil. Generally not affected by moderate chemicals, fats greases
and many oils and solvents. Generally attacked by strong oxidising acids, ketones, esters, nitro hydro carbons and
chlorinated aromatic hydrocarbons.
212oF
100oC -4oF -20oC 50oto 130oF 10oto 54oC
Santoprene® - Injection moulded thermoplastic elastomer with no fabric layer. Long mechanical flex life.
Excellent abrasion resistance. 212oF
100oC -10oF -23oC 50oto 212oF 10oto 100oC
PTFE - Chemically inert, virtually impervious. Very few chemicals are known to react chemically with PTFE : mol-
ten alkali metals, turbulent liquid or gaseous fluorine and a few fluoro-chemicals such as chlorine trifluoride or oxygen
difluoride which readily liberate free fluorine at elevated temperatures.
212oF
100oC 32oF 0oC 50oto 212oF 10oto 100oC
Viton® - Shows good resistance to a wide range of oils and solvents : especially all alphatic, aromatic and
halogenated hydrocarbons, acids, animal and vegetable oils. 212oF
100oC 0oF -18oC 75oto 212oF 24oto 100oC
Polypropylene - High strength, light weight, corrosion resistant polyolefin which easily withstands most chemi-
cals, with no known solvent at room temperature. 158oF
70oC -40oF -40oC 50oto 140oF 10oto 60oC
Temperature Guide & Pump Code Matrix
VALVE SEATS
T : PTFE
VALVE BALLS
T : PTFE
DIAPHRAGMS
T : PTFE
X : PTFE/VITON (HIGH TEMP.)
(SEE PAGE 10 FOR DETAILS ON SPECIFY-
ING
HIGH TEMPERATURE APPLICATIONS)
SUFFIX - (WHERE APPLICA-
BLE)
LF : LUBE FREE
F : FLANGED - ANSI 150
H : HYDROSTATIC TEST
(A THREE DIGIT NUMBER SUFFIX
DENOTES A SPECIAL DESIGN
i.e. 301 = OPPOSED SUCTION)
PREFIX
B : BLAGDON UK
N : BLAGDON USA
V : VERSA-MATIC
X : ATEX CERTIFIED
WETTED COMPONENTS
T : PTFE
4: CONDUCTIVE PTFE
NON - WETTED COMPONENTS
4 : CONDUCTIVE PTFE
5 : POLYETHYLENE (HDPE)
VALVE TYPE
B : BALL
SUCTION ORIENTATION
B : BOTTOM
DESIGN LEVEL
MODEL NO.
25 : SERIES 00
TYPICAL CODE = B 25.00.T 5. B B. T T T - LF

HG-CF-1101 Rev. C – 19.05.06 Page 7
Dimension drawing - Standard
Dimension drawing - Flanged - 1” ANSI 150
NOTE! All dimensions are +/- 2mm, both manifolds shown in Opposed layout to standard orientation.
NOTE! All dimensions are +/- 2mm, both manifolds shown in Opposed layout to standard orientation.

HG-CF-1101 Rev. C – 19.05.06 Page 8
Parts List - (Refer to Exploded view on page 9)
PART NUMBER DESCRIPTION QTY
REF
No. VIRGIN
PTFE CONDUCTIVE PTFE COMMON HIGH TEMPERATURE
1 25-035 FRONTPLATE ASSEMBLY 2
2 G229 O-RING 2
3 25-016 DIAPHRAGM - PTFE OVERLAY  2
4 25-014 25-013 DIAPHRAGM - SUPPORT  2
5 1A259 BACKPLATE 2
6 25-060 DIAPHRAGM SHAFT 1
7 G514 G536 O-RING  6
8 G367 G509 O-RING  2
9 G245 G533 O-RING  2
10 40-194 DIAPHRAGM SHAFT BUSH 2
11 G189 G508 O-RING  2
12 40-240 SILENCER 1
13 25-179 VALVE BLOCK STRAP 2
14 25-178 MANIFOLD STRAP 2
15 B469 DOME NUT M8 4
16 25-192 TIE ROD - MANIFOLDS M8 4
17 25-188 25-175 - DISCHARGE MANIFOLD - BSP 1
18 25-193 BALL CAGE 4
19 1A002 BALL VALVE 4
20 25-194 VALVE SEAT 4
21 G431 O-RING  4
22 25-183 SPACER - VALVE CHEST 4
23 25-191 25-181 - VALVE CHEST 1
24 G243 O-RING  2
25 G242 O-RING  2
26 B043 NUT M8 20
27 25-177 RING - INNER/OUTER COVER 4
28 25-190 25-180 - INNER COVER 2
29 D380 SOCKET C’SUNK SCREW M8 x 30 8
30 25-189 25-173 OUTER COVER 2
31 A497 BOLT - HEX. HD. M8 x 140 16
32 25-195 BASE LEG 2
33 C173 SPRING WASHER M8 8
34 1H024 BASE PAD 4
35 1H033 BASE LEG CAP 4
36 D215 SOCKET HEAD CAP SCREW M6 x 20 4
37 C048 WASHER M6 4
38 B154 NUT M6 4
39 SA10288 GROUNDING LEAD ASSY. (ATEX MODELS ONLY) 1
40 25-187 25-184 - SUCTION MANIFOLD - BSP 1
41 40-004 SLIDE VALVE  1
42 40-005 SLIDE VALVE PLATE  1
43 40-204 GASKET  1
44 D491 SOCKET HD. CAP SCREW M8 x 150 4
45 40-215 VALVE BLOCK  1
46 40-192 VALVE CARRIER  1
47 G512 O-RING  2
48 40-207 VALVE BLOCK PLUG  2
49 H501 CIRCLIP  2
A
C
C
B
- Indicates Torque setting required. See page 9 for details.
B

HG-CF-1101 Rev. C – 19.05.06 Page 9
Exploded Assembly
TORQUE SETTINGS
A FRONTPLATE - 35 - 38 Nm(26 - 28 lbs/ft) B OUTER COVERS - 6.2 - 6.7 Nm (55 - 60 lbs/in)
MANIFOLDS - 4.5 Nm (40 lbs/in) VALVE BLOCK - 4.5 Nm (40 lbs/in)
C
Spares Kits
- Wet Side Kits
- Air Side Kits
- Valve Block Sub-Assemblies
See page 14 for all available kits

HG-CF-1101 Rev. C – 19.05.06 Page 10
HIGH TEMPERATURE INSTALLATIONS
In situations where the temperature of the fluid to be pumped is likely to exceed 80°C, a high temperature pump code must be specified. This
is signified using an ‘X’ in the last part of the pump code as shown.
“XTS” in place of “TTS”. Reference Pump Code matrix on page 6
This indicates the following specification amendments :-
All seals and o-rings will be changed from Buna-N to Viton. Any gaskets will be changed to a higher temperature spec. Diaphragm shaft
bushes will be changed from plastic to metal, back-up diaphragms and any bumpstops will be changed to Viton.
Refer to main table on page 8 for quantities / pump.
Flanged Manifolds
Suction Lift Installation
Flooded Suction Installation
Submerged Installation
Exhaust Safety :-
When a diaphragm fails during operation, pumped liquid can enter and contaminate the air side of the pump. If diaphragm failure is not
severe, i.e. a small split or hole, then the pump can continue to run, with air being forced into the product being pumped. If however the
failure is more serious, then the pump may stop, with fluid or fumes being expelled through the exhaust. Under these conditions it is
recommended that the exhaust is piped away to a safe area. In standard suction lift conditions this can simply be done by piping from the
exhaust connection to a safe area. Multiple installations can be piped to a common connection, then to a safe area. In flooded suction
conditions the exhaust must be taken to a point higher than the fluid level to prevent any siphoning away. In submerged conditions ensure
exhaust is piped away above fluid level.
In all conditions ensure exhaust outlet is not expelling across a non-conductive surface. The exhaust must not be placed less than 100mm
from any non-conductive surface, as this may generate a propagating brush discharge resulting in a possible ignition source.
Exhaust Safety Instructions
FLANGED MANIFOLD PART NOS.
SUCTION
MANIFOLD
40 ANSI 150 PN16
VIRGIN PTFE 25-196 25-200
CONDUCTIVE PTFE 25-198 25-202
DISCHARGE
MANIFOLD
17 ANSI 150 PN16
VIRGIN PTFE 25-197 25-201
25-199 25-203CONDUCTIVE PTFE

HG-CF-1101 Rev. C – 19.05.06 Page 11
Performance Curve
B25 Pump performance curve Performance based on waterat ambient temperature
Re-Assembly of Outer Covers
When re-assembling the pump after any service or maintenance work, both Outer Covers must be re-torqued using the sequence shown
above. The orientation of the pump is not important, providing the above sequence is followed. Failure to comply with these instructions
may result in poor sealing and mis-alignment between the diaphragm sealing faces.

HG-CF-1101 Rev. C – 19.05.06 Page 12
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.
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 SIDE OVERHAUL
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 : The nominal 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 damage. If worn,
replace 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
REPLACING 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 180oand 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.
REPLACING DIAPHRAGMS
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.
On all pumps fitted with stainless steel
fasteners, including clamp bands, it is
recommended that anti-seize paste is
applied to the threads. Bolted assemblies
should be torqued to the settings shown
in the parts list. Please refer to the dia-
gram on page 11 for the correct se-
quence for re-assembly of the Outer
Covers. (This is very important for
reliable sealing). Re-assemble manifolds
in reverse of the sequence described ear-
lier.

HG-CF-1101 Rev. C – 19.05.06 Page 13
Atex Certified Models
Take
action
to prevent static sparking. Fire or explosion can result,
especially when handling flammable liquids. The
pump, piping, valves, containers or other
miscellaneous equipment must be grounded.
WARNING!
When used for toxic or aggressive fluids, the pump
should always be flushed clean prior to disassembly.
User must ensure chemical compatibility, and any
pressure / temperature limits are not exceeded. These
instructions include all the information for relevant diaphragm temperature
limits. Pump temperature range can also be found on data-plate attached to
the pump.
If pump is not used for more than 5 days, care must be taken when restarting.
If in any doubt, remove pump from line and flush with a suitable cleaner.
Solidified deposits within the pump may cause damage to the diaphragms.
WARNING!
Before pump operation, inspect all gasketed fasteners for
looseness caused by gasket creep. Re-torque loose
fasteners to prevent leakage. Follow recommended
torques stated in this manual. In cases of excess vibra-
tion, Blagdon recommend fitting a Pulsation Dampener to
remove effects of pulse actions from pump operation. Flexible connections
can be used, but must be kept to a minimum length necessary to avoid sharp
flexing or straining movements.
CAUTION!
In the event of diaphragm rupture, pumped material may
enter the air end of the pump, and be discharged into
the atmosphere. If pumping a product which is hazard-
ous or toxic, the air exhaust must be piped to an appro-
priate area for safe disposition.
WARNING!
Grounding the pump :-
All models are certified as shown on page 1 of this manual.
Maximum temperature of fluid to be handled must be specified at time
of order. Pump must be marked with this information. For grounding
details see below.
This unit is supplied with a natural earth ground cable. This cable is 2
meters in length and permanently connected through a stud at one
end to the pump centre casting. The other end is free to connect to
the nearest available suitable point to provide a natural earth ground.
This must be done to reduce the risk of electro-static sparking.
Refer to table on Page 8 for details and relevant Part Numbers.
This unit is supplied with a natural earth ground cable.
This cable is 2 meters in length and permanently con-
nected through a stud at one end to the pump centre
casting. The other end is free to connect to the nearest
available suitable point to provide a natural earth
ground. This must be done to reduce the risk of electro-
static sparking.
Take action to prevent static sparking. Fire or
explosion can result, especially when handling
flammable liquids. The pump, piping, valves,
containers or other miscellaneous equipment must be
grounded.
WARNING!

HG-CF-1101 Rev. C – 19.05.06 Page 14
Wet Side Kit Structure
TYPICAL CODE = SA 25 00 N N M R
PUMP BODY / BALL VALVE MATERIAL :
M : METALLIC
N : NON-METALLIC
S : 1/2” STAINLESS STEEL
W : WEIGHTED VALVE BALL
Z : HYGIENIC MODELS
VALVE BALLS :
B : BUNA-N S : 316 ST. STEEL
D : DELRIN (ACETAL) T : PTFE
E : EPDM V : VITON
N : NEOPRENE
PART NUMBER :-
SA : ALL KITS
DIAPHRAGMS :
B : BUNA-N P : POLYURETHANE
E : EPDM R : SANTOPRENE
H : POLYESTER T : PTFE
N : NEOPRENE V : VITON
O : ONE PIECE PTFE X : HIGH TEMP.
VALVE SEAT MATERIAL / 2:1 OPTION :
R : RUBBER OPTIONS
(ONLY USED IF PUMP TRIMMED WITH
RUBBER SEATS)
1 : HIGH PRESSURE (W1 MODELS)
MODEL NUMBER :
Pump Type i.e:- 06, 15 , 1H , 1A , 25 ,
40, 1B , 2B , 50 , 1C.
Diaphragm Pump Wet-Side Kits - Part Number Structure
The format of the Wet-Side kit part number is broken down as shown below. The number always starts with ‘SA’ followed by the model
number, diaphragm letter, ball valve letter and pump material. If rubber seats are used, an ‘R’ is added to the end. A ‘W’ is added fol-
lowing the ball valve letter if pump is fitted with weighted balls. These are not available for sizes below 1”.
If pump model number includes a revision number then this is added where shown below. Please refer to either the pump nameplate
or the operating manual provided with the pump if this is to be included, i.e. B0601SSBBTTS
NOTE! This part number system does not apply to pumps designated :-
B4001, B5001 or B7501. Please consult the pump Service & Operating Manuals for Wet-Side Kit numbers for these models.
If in doubt please consult Sales at Blagdon Pump.
DESIGN REVISION :
SEQUENTIAL NUMBER STARTING AT 00
(NOT USED IF MODEL HAS NOT BEEN
REDESIGNED SINCE DEC. 1999)
I.E. SA15BBNR
(SEE NOTE ABOVE)
Spares Kits
The following details refer to the main recommended spares kits available for your Blagdon Pump. Not all combinations and trim
options are listed here. Please refer to your local stockist / distributor if you require further details or availability of other kits.
 - Air Side Kits - SA10515 - Standard Air side kit. All pumps are Lube Free as standard. If lubrication is used inadvertently this will not
damage the pump in any way.
Note! This kit is identical to SA10415 but without the 8 G339 O-Rings.
- Valve Block Sub-Assemblies -
SA10463 - BSP
SA10465 - NPT
 - Wet Side Kits - SA2500TTN
 - Filter / Regulator SA10444
 - Filter/Regulator/Lubricator - FRL SA10378

HG-CF-1101 Rev. C – 19.05.06 Page 15
Date Details Completed
Service / Maintenance Log
RECYCLING
Many components of BLAGDON air operated double diaphragm pumps are made of recyclable materials. We encourage pump
users to recycle worn out parts and pumps whenever possible, after any hazardous pumped fluids are thoroughly flushed.
Notes

HG-CF-1101 Rev. C – 19.05.06 Page 16
BLAGDON PUMP
A Unit of IDEX Corporation
Lambert Road, Armstrong,
Washington, Tyne & Wear.
NE37 1QP, England.
Tel. [phone]
Fax. [phone]
Jeff Sill,
General Manager
HG-CF-223 (REV 4)