Blagdon Pump B75 Metallic User Manual
Page 19
Blagdon Pump • A Unit of IDEX Corporation • R79 Shannon Industrial Estate • Co Clare, Ireland • Tel: +353 (0) 61 471933 • Fax: +353 (0) 61 475046
www.blagdonpump.com • E-Mail: [email protected]
x75mdl1sm-rev0812
Page 17
Air Operated Double Diaphragm Pump 6/05
Page 17
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 1/2" wrench or socket,
remove the four capscrews (item 11).
Remove the air inlet cap (item 8) and air
inlet gasket (item 21). The pilot valve
assembly (item 4) can now be removed
for inspection and service.
STEP #2: Disassembly of the pilot
valve.
Remove the pilot valve spool (item
4-D). Wipe clean and inspect spool and
o-rings for dirt, cuts or wear. Replace the
o-rings and spool if necessary.
Remove the retaining ring (item 4-F)
from the end of the sleeve (item 4-B)
and remove the sleeve from the valve
body (item 4-A). Wipe clean and inspect
sleeve and o-rings for dirt, cuts or wear.
Replace the o-rings and sleeve if
necessary.
STEP #3: Re-assembly of the pilot
valve.
Generously lubricate outside
diameter of the sleeve and o-rings. Then
carefully insert sleeve into valve body.
Take CAUTION when inserting sleeve,
not to shear any o-rings. Install retaining
ring to sleeve. Generously lubricate
outside diameter of spool and o-rings.
Then carefully insert spool into sleeve.
Take CAUTION when inserting spool,
not to shear any o-rings. Use BP-LS-
EP-2 multipurpose grease, or equivalent.
STEP #4: Re-install the pilot valve
assembly into the intermediate.
Be careful to align the ends of the
pilot valve stem between the plunger
pins when inserting the pilot valve into
the cavity of the intermediate.
Re-install the gasket, air inlet cap
and capscrews. Connect the air supply
to the pump. The pump is now ready for
operation.
Pilot Valve Servicing, Assembly Drawing & Parts List
PILOT VALVE ASSEMBLY PARTS LIST
ITEM
PART NUMBER
DESCRIPTION
QTY
4
095-110-000
Pilot Valve Assembly
1
4-A
095-095-157
Valve Body
1
4-B
755-051-000
Sleeve (With O-rings)
1
4-C
560-033-379
O-ring (Sleeve)
6
4-D
775-055-000
Spool (With O-rings)
1
4-E
560-023-379
O-ring (Spool)
3
4-F
675-037-080
Retaining Ring
1
FOR PUMPS WITH CAST IRON CENTER SECTION
ITEM
PART NUMBER
DESCRIPTION
QTY
4
095-110-558
Pilot Valve Assembly
1
4-A
095-095-558
Valve Body
1
(includes all other items used on 095-110-000)
FOR PUMPS WITH STAINLESS STEEL CENTER SECTION
ITEM
PART NUMBER
DESCRIPTION
QTY
4
095-110-110
Pilot Valve Assembly
1
4-A
095-095-110
Valve Body
1
(includes all other items used on 095-110-000)