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Blagdon Pump B75, Service & Operating Manual, Page: 12 / 12

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Blagdon Pump B75 Service & Operating Manual Download Page 12

520-319-000  Air Operated Double Diaphragm Pump   11/01

PUMPING HAZARDOUS
LIQUIDS

When a diaphragm fails, the

pumped liquid or fumes enter the
air end of the pump. Fumes are
exhausted into the surrounding
environment. When pumping haz-
ardous or toxic materials, the ex-
haust air must be piped to an ap-
propriate area for safe disposal. See
illustration #1 at right.

This pump can be submerged if

the pump materials of construction
are compatible with the liquid being
pumped. The air exhaust must be
piped above the liquid level. See
illustration #2 at right. Piping used
for the air exhaust must not be
smaller than 1" (2.54 cm) diameter.
Reducing the pipe size will restrict
air flow and reduce pump perfor-
mance. When the pumped product
source is at a higher level than the
pump (flooded suction condition),
pipe the exhaust higher than the
product source to prevent siphon-
ing spills. See illustration #3 at right.

IMPORTANT INSTALLATION
NOTE:

 

The manufacturer recom-

mends installing a flexible hose or
connection between the pump and
any rigid plumbing. This reduces
stresses on the molded plastic
threads of the air exhaust por t.
Failure to do so may result in
damage to the air distribution valve
body.

Any piping or hose connected to

the pump’s air exhaust port must be
physically supported. Failure to
support these connections could
also result in damage to the air
distribution valve body.

SAFE AIR
EXHAUST
DISPOSAL
AREA

PUMP INSTALLATION AREA

1"  DIAMETER AIR

EXHAUST PIPING

SILENCER

CONVERTED EXHAUST ILLUSTRATION

Illustration #1

Illustration #2

Illustration #3

1"  DIAMETER AIR
EXHAUST PIPING

LIQUID
LEVEL

SUCTION

LINE

SILENCER

1"  DIAMETER AIR
EXHAUST PIPING

LIQUID
LEVEL

SUCTION

LINE

SILENCER

Page  10

Check Valve Drawing

CHECK VALVE SERVICING

Before servicing the check valve

components, first shut off the
suction line and then the discharge
line to the pump. Next, shut off the
compressed air supply, bleed air
pressure from the pump, and dis-
connect the air supply line from the
pump. Drain any remaining fluid from
the pump. The pump can now be
removed for service.

To access the check valve

components, remove the manifold
(item 23 or item 22 not shown). Use
a 

5

/

8

" &

 11

/

16

" wrench or socket to re-

move the fasteners. Once the mani-
fold is removed, the check valve
components can be seen.

Inspect the check balls (items 2)

for wear, abrasion, or cuts on the
spherical surface. The check valve
seats (item 35) should be inspected
for cuts, abrasive wear, or embed-
ded material on the surfaces of both
the external and internal chambers.
The spherical surface of the check
balls must seat flush to the surface
of the check valve seats for the pump
to operate to peak efficiency.
Replace any worn or damaged parts
as necessary.

Reassemble the check valve

components. The seat should fit
into the counter bore of the outer
chamber.

23

10

2

35

14

36

25

with Non-Metallic

Seats

with Metallic Seats

The pump can now be reas-

sembled, reconnected and returned
to operation.

METALLIC SEATS

Two o-rings (or seals) (item 28)

are required for metallic seats.

Summary of Contents for B75

Page 1: ...ial Codes 5 Composite Repair Parts Drawing 6 Available Service and Conversion Kits 6 Composite Repair Parts List 6 Air Distribution Valve Assembly Drawing and Parts List 7 Air Distribution Valve Servicing 7 Pilot Valve Assembly Drawing and Parts List 8 Pilot Valve Servicing 8 Diaphragm Service Drawing with Overlay 9 Diaphragm Service Drawing Non Overlay 9 Diaphragm Servicing 9 Overlay Diaphragm Se...

Page 2: ......

Page 3: ...Gallons per minute 1 36 Bar 20 PSI Air Inlet Pressure 136 80 B75 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 Lambert Road Armstrong Washington Tyne Wear NE37 1QP ENGLAND Tel 0191 4177475 Fax 0191 4175435 e mail sales blagdonpump com B...

Page 4: ...ydraulic fluid resistance Should not be used with highly polar solvents like acetone and MEK ozone chlorinated hydrocarbons and nitro hyrdrocarbons EPDM Shows very good water and chemical resistance Has poor resistance to oil and solvents but is fair in ketones and alcohols Neoprene All purpose Resistant to vegetable oil Generally not affected by moderate chemicals fats greases and many oils and s...

Page 5: ...25 psi 8 6 bar Connect the pump air inlet to an air supply of sufficient capacity and pressure required for desired performance When the air supply line is solid piping use a short length of flexible hose not less than 13mm in diameter between the pump and the piping to reduce strain to the piping The weight of the air supply line regu lators and filters must be supported by some means other than ...

Page 6: ...o Check Blocked discharge line Corrective Action Check for obstruction or closed discharge line valves What to Check Blocked pumping chamber Corrective Action Disassemble and inspect the wetted chambers of the pump Remove or flush any obstructions Refer to the pump SERVICE MANUAL for disassembly instructions What to Check Entrained air or vapor lock in one or both pumping chambers Corrective Actio...

Page 7: ...n Molded Polyurethane 358 Urethane Rubber Compression Mold 359 Urethane Rubber 360 Buna N Rubber Color coded RED 361 Buna N 363 Viton Flurorel Color coded YELLOW 364 E P D M Rubber Color coded BLUE 365 Neoprene Rubber Color coded GREEN 366 Food Grade Nitrile 368 Food Grade EPDM 370 Butyl Rubber Color coded BROWN 371 Philthane Tuftane 374 Carboxylated Nitrile 375 Fluorinated Nitrile 378 High Densit...

Page 8: ...10E Manifold Discharge 3 BSP Parallel 1 B518 156 110E Manifold Discharge 3 BSP Parallel 1 B518 156 156E Manifold Discharge 3 BSP Parallel 1 24 B530 010 000 Silencer 1 25 B545 005 330 Nut Hex 7 16 14 16 26 B545 007 330 Nut Hex 1 2 13 16 27 B560 001 360 O Ring 2 28 B560 105 360 Seal O Ring see item 35 8 B560 105 363 Seal O Ring see item 35 8 B560 105 364 Seal O Ring see item 35 8 B560 105 365 Seal O...

Page 9: ...l one bumper item 1 C one end cap item 1 E with an o ring item 1 G into one end of the air valve body item 1 B Install one retaining ring item 1 H into the groove on the same end Remove the new sleeve an spool set item 1 A from the plastic bag Carefully remove the spool from the sleeve Install the six o rings item 1 G into the six grooves on the sleeve Apply a light coating of grease to the o ring...

Page 10: ...ing of grease to the outer diameter of the pilot valve spool and gently push the spool through each wiper Step 4 Inspect the actuator plungers See ILLUSTRATION AT RIGHT The actuator plungers items 31 can be reached through the pilot valve cavity in the intermediate assembly item 5 Remove the plungers item 30 from the bushings item 7 in each end of the cavity Inspect the installed o ring items 27 f...

Page 11: ...k into the vice Use a torque wrench to tighten the diaphragm assembly together to 50 ft lbs 67 79 Newton metres 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 5 Installing the diaphragm assemblies to the pump Make sure the bumper item 6 is installed over the diaphragm rod Thread the stud of the one...

Page 12: ...SAL AREA PUMP INSTALLATION AREA 1 DIAMETER AIR EXHAUST PIPING SILENCER CONVERTED EXHAUST ILLUSTRATION Illustration 1 Illustration 2 Illustration 3 1 DIAMETER AIR EXHAUST PIPING LIQUID LEVEL SUCTION LINE SILENCER 1 DIAMETER AIR EXHAUST PIPING LIQUID LEVEL SUCTION LINE SILENCER Page 10 Check Valve Drawing CHECK VALVE SERVICING Before servicing the check valve components first shut off the suction li...

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