PERFORMANCE BULLETIN 111 – Metal Valve Single Piece Shaft Update

The Shaft for ¾”, 1”, 1.5”, and 2” metal valves (V421, VAV1, V424, VAV4, V425, and VAV5) are being updated to a new single piece design. This new design incorporates the shaft and disk holder into a single casting eliminating one potential leak point within the valve. The assembled dimensional characteristics will not be affected. As a result of this change, the Internal Parts Repair Kits will include the single piece shafts. Part numbers for Internal Part Kits and valve assemblies will remain the same. The new shafts are fully interchangeable with the old design and will be available once inventory of the old design is exhausted.

Because of this change, new Part Numbers are being introduced to replace the old shaft and disk holder
Part Numbers as shown below:

Old 421 & VAV1 Shaft Design	New 421 & VAV1 Single Piece Shaft Design
Normally Open Shaft PN 1074150 Copper Gasket PN 1073948 Disk Holder PN 1074128	Normally Open Shaft Assy PN 43975-02
Normally Closed Shaft PN 1074153 Copper Gasket PN 1073948 Disk Holder PN 1074128	Normally Closed Shaft Assy PN 43975-03

Old 424 & VAV4 Shaft Design	New 424 & VAV4 Single Piece Shaft Design
Normally Open Shaft PN 1074239 Copper Gasket PN 1073948 Disk Holder PN 1074231	Normally Open Shaft Assy PN 44013
Normally Closed Shaft PN 1074241 Copper Gasket PN 1073948 Disk Holder PN 1074231	Normally Closed Shaft Assy PN 44013-02

Old 425 & VAV5 Shaft Design	New 425 & VAV5 Single Piece Shaft Design
Normally Open Shaft PN 1074314 Copper Gasket PN 4074252 Disk Holder PN 43731	Normally Open Shaft Assy PN 44017
Normally Closed Shaft PN 1074317 Copper Gasket PN 4074252 Disk Holder PN 43731	Normally Closed Shaft Assy PN 44017-01

PERFORMANCE BULLETIN 111 – Metal Valve Single Piece Shaft Update

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