Yamada 709459 Center Disk, Air Side for NDP-25 and NDP-32
The Yamada 709459 is a factory center disk, air side used in NDP-32 Series pumps and NDP-25 PTFE diaphragm builds. It carries the clamping load on the diaphragm bead and sets the point at which the flexible part of the diaphragm begins.
It is worth replacing the disks whenever the diaphragm has failed suddenly, because debris from the failure gets between the disk and the diaphragm bead, and because whatever attacked the diaphragm has usually had a go at the disk as well.
Key Features
- Genuine Yamada replacement center disk, air side
- Fits NDP-32 Series pumps and NDP-25 PTFE diaphragm builds
- Two per pump
- Clamps the diaphragm bead evenly on the center rod
- Smooth support rim so the diaphragm flexes where it should
- Direct replacement, no modification required
Applications
- NDP-32 Series pumps and NDP-25 PTFE diaphragm builds
- Diaphragm changes and liquid end rebuilds
- Replacing a disk with a burred or corroded rim
- Service after a sudden diaphragm failure
- Restoring even clamping on the diaphragm bead
- Marine, industrial and transfer duty
Specifications
- Brand: Yamada
- Manufacturer: Yamada America
- Manufacturer Part Number: 709459
- Part Type: Center Disk, Air Side
- Fits: NDP-32 Series pumps and NDP-25 PTFE diaphragm builds
- Quantity Used: Two per pump
- Series Port Size: 1 in on the NDP-25 Series
- Condition: New
Frequently Asked Questions
Q: Does an abrasion pad do the same job?
No. A pad sits against the diaphragm to take abrasive wear on solids laden duty, extending diaphragm life. The disk carries the clamping load.
Q: Should both sides be replaced together?
If one disk is being replaced because of damage, check the opposite one closely. They share the same stroke and usually the same condition.
Q: Do the disks need replacing every time the diaphragm is changed?
Not always, but they should be inspected every time. Replace any disk with a burr, a lifted edge, corrosion pitting or a visible cup, because all of those shorten the life of the new diaphragm.
Q: What is the difference between the air side and liquid side disks?
They sit on opposite faces of the diaphragm. The liquid side disk is exposed to the pumped product and is made to suit it; the air side disk sees only compressed air. They are not interchangeable.
Not sure this is the right part? Send us a Picture of the Pump Plate on your pump and the CLR Marine team will confirm the correct center disk, air side.
CLRMarine
