Part Location Diagram of AB-A640050 DeWALT VALVE PLATE ASSY.
See part 6 in the diagram
( Grid squares measure 1x1 inch )

VALVE PLATE ASSY. AB-A640050

Manufactured by:
DeWALT
ERP Number:
ERP18991033
Part Number:
AB-A640050
Original Equipment Manufacturer ?
In Stock
Delivers in 3-5 Business Days!

Easy 

30 - 60 mins 

(41 rated repairs) ?

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Product Description

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This is a genuine Bostitch replacement part, it is sold individually. The purpose of the Valve Plate is to allow into the cylinder.<br<When the piston is being pulled down the reeds on the Valve Plate are closed and air is building up in the cylinder. Once the piston starts traveling up the reeds on the Valve Plate open and air is sent into the air tank. Overtime the reeds will become worn and the Valve Plate will need to be replaced. This is also a good time to replace the head gaskets.

Frequently Purchased Together

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Troubleshooting

This part works with the following brands:
  • Bostitch
This part works with the following products:
  • Compressor
Part# AB-A640050 replaces these:
AB-A640050,

Customer Part Reviews

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4.9
Average Rating (out of 5):
★★★★★
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(12 Reviews)
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Customer Repair Instructions

All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part.

Easy 

30 - 60 mins 

(41 rated repairs) ?
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Compressor didn\'t hold pressure above 20psi

John from Marblehead , Massachusetts

14 of 14 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
Less than 15 mins
Tools:
Screw drivers
Parts Used:
AB-A650300, AB-A640050
1. Took off the handle, then the plastic cover.
2. Unscrewed the cylinder head - immediately saw the broken reed valve.
3. Replaced the reed valve and the gasket that seemed compromised when taking off the cylinder head.
4. Put it back together.
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Compressor would pump to 20 psi and no more

Gary from Lakeland, Florida

4 of 4 people found this instruction helpful.
Difficulty Level:
A Bit Difficult
Total Repair Time:
30 - 60 mins
Tools:
Socket set, Wrench set
Parts Used:
AB-A650300, AB-A640050
Removed compressor head and valve plate assy.
Installed new valve plate assembly and new gaskets.
Compressor works as should pumping to 130 psi.
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Valve plate had a broken piece on the valve

Philip from Cloudcroft, New Mexico

1 person found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
30 - 60 mins
Tools:
Screw drivers, Socket set, Wrench set
1. I removed the broken valve plate assembly.
2. I replaced with the new valve plate assembly.
3. Placed new cylinder head gasket on the new plate.
4. Then replaced all the components of the cylinder head.
5. Pulled the broken quick coupling and replaced with the Quick Coupling 1/4in M.

Make sure to pu t thread sealant on the quick coupling. Good luck.
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Compressor would not build up air when running.

John from Richmond, Kentucky

1 person found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
15 - 30 mins
Tools:
Screw drivers, Socket set
Parts Used:
AB-A640050, A631040
Replaced the reed valve and the cylinder.
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Small metal reed valves had failed. Compressor would only pump to 65 PSI.

Tim from East Palestine, Ohio

1 person found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
15 - 30 mins
Tools:
Screw drivers, Socket set, Wrench set
1. Removed the plastic cover and the handle covering the compressor.
2. Removed 2 screws and 2 bolts with the nuts that secure the cylinder head.
3. Removed the cylinder head to replace the damaged valve plate assembly.
4. Removed the intake reed valve from the top of the piston and replaced with the new part.
5. Installed the new gasket between the valve plate and the head.
6. Reinstalled the bolts and the screws that hold the head and the torque.
7. Removed one screw on the piston rod and installed the new cooling fan.
8. Reassembled the cover and test ran. All worked fine.
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Compressor not building pressure

luke from morganville, New Jersey

1 person found this instruction helpful.
Difficulty Level:
A Bit Difficult
Total Repair Time:
More than 2 hours
Tools:
Socket set, Wrench set
Parts Used:
AB-A650300, AB-A640050
Removed 4 bolts and cover to access motor.
Removed one air line and 4 bolts & nuts to inspect piston / valve plate.
Found valve plate damaged.
Ordered parts & replaced valve plate along with new gaskets on either side.
Reassembled all previously removed parts, operational & leak checks good.

Once parts were in hand, actual time of repair was less than 30 minutes. Original troubleshooting and parts ordering process.
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During my basement remodel, my Bostitch air compressor quit building up pressure. It sat idile for 3 years. Bought another inexpensive compressor but ccouldn\\

Richard from Windsor, Colorado

1 person found this instruction helpful.
Difficulty Level:
A Bit Difficult
Total Repair Time:
30 - 60 mins
Tools:
Nutdriver, Screw drivers, Wrench (Adjustable), Wrench set
Parts Used:
AB-A650300, AB-A640050
Simple repair. Removed the cover. Removed air tube from compressor head. Removed 4 head bolts. Removed the head, valve plate assembly and gaskets on both sides of the valve plate. Reassembled in reverse order. Ereplacementparts.com was fast in shipping the parts and was over half as expensive as other places. Second time I used them and w ill continue to with next project.
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Compressor would not hold any air

Roberto from Belvidere, Illinois

0 of 1 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
Less than 15 mins
Tools:
Screw drivers
Parts Used:
AB-A640050
1 Removed the handle and cover from compressor
2 Removed four allen screws from cylinder head
3 Removed and replaced air valve plate assembly
4 Replaced cylinder head
5 Replaced plastic cover and handle
6 Tested compressor and verified function
7 Overall about 10 minutes to fix
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Reed valve broke

Brian from Medford lakes, New Jersey

0 of 1 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
Less than 15 mins
Tools:
Screw drivers, Socket set, Wrench set
Parts Used:
AB-A650300, AB-A640050
Followed a tutorial I googled. Took off the cover, disconnected the supply line fitting, 4 hex screws on top of the cylinder, pulled off the old reed valve assembly, scraped off the old gaskets, put on the new gaskets and reed assembly, put everything back together.
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Valve was broken.

Stephen from Coon Rapids, Iowa

0 of 1 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
15 - 30 mins
Tools:
Screw drivers, Socket set, Wrench set
Parts Used:
AB-A650300, AB-A640050
1. Removed the cover.
2. Disconnected the air line.
3. Removed the cylinder head.
4. Replaced the valve plate and the head gasket.
5. Reassembled the compressor.
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