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Blagdon Pump B75, Service & Operating Manual, Page: 10 / 12

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Blagdon Pump B75 Service & Operating Manual Download Page 10

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

PILOT VALVE SERVICING

To service the pilot valve first shut

off the compressed air supply, bleed
the pressure from the pump, and
disconnect the air supply line from
the pump.

Step #1:

 See PUMP ASSEMBLY

DRAWING.

Using a ½" wrench or socket,

remove the four capscrews (items
11) and four flat washers (items 38).
Remove the air inlet cap (item 8) and
air inlet gasket (item 20). The pilot
valve assembly (item 4) can now be
removed for inspection or service.

Step #2:

 Disassembly of the

pilot valve.

Remove the pilot valve spool

(item 4-E). Wipe clean, and inspect
for dirt, scratches or wear. Replace
the spool if necessary.

Remove the two retaining rings

(items 4-C) from each end of the
pilot valve body.

Remove the two pilot valve bush-

ings (items 4-B), five spacers (items
4-D), and six spool wipers (items
4-F) by pushing gently from other
end of the pilot valve body. Inspect
the wipers for cuts and/or wear.
Replace any wipers as necessary.

Step #3:

 Re-assembly of the

pilot valve.

First install a retaining ring to one

end of the pilot valve. Install one
bushing making sure the step side
faces toward the wiper. Apply a light
coating of grease to the outside
diameter of each wiper. Next, gently
push in the wipers and spacers until
they are against the installed retain-
ing ring and bushing in the opposite
end of the pilot valve body. Install the
remaining bushing making sure the
step side faces the wiper. Install the
remaining retaining ring.

Apply a light coating of grease to

the inner diameter of each wiper.
Also apply a light coating 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)for cuts and/or wear.

Replace the o-rings if necessary.
Apply a light coating of grease to
each o-ring and re-install the plung-
ers in to the bushings. Push the
plungers in as far as they will go.

To remove the bushings (item 7),

first remove the retaining rings
(item 32) by using a flat screwdriver.
NOTE: It is recommended that new
retaining rings be installed.

Step #5:

 Re-install the pilot valve

assembly into the intermediate
assembly.

Be careful to align the ends of the

stem between the plungers when
inserting the stem of the pilot valve
into the cavity of the intermediate.

Re-install the gasket (item 20), air

inlet cap (item 8), capscrews and
washers (items 11 and 38).

Connect the air supply to the

pump. The pump is now ready for
operation.

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

.

IMPORTANT!

Page  8

PILOT VALVE ASSEMBLY PARTS LIST

ITEM

PART NUMBER

DESCRIPTION               QTY

4

B095-096-000

Pilot Valve Assembly

1

4-A

B095-095-551

Body, Pilot Valve

1

4-B

B135-037-506

Bushing

2

4-C

B675-057-115

Ring, Retaining

2

4-D

B770-065-175

Spacer

5

4-E

B775-041-506

Spool, Pilot

1

4-F

B917-003-374

Wiper

6

Pilot Valve Assembly Drawing

27

7

32

31

5

ACTUATOR  PLUNGER

SERVICING

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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