Yamada 805084 Air Valve Assembly for NDP-40, NDP-50, NDP-80
The Yamada 805084 is a genuine Yamada air valve assembly, used in NDP-40, NDP-50, NDP-80 series air-operated double diaphragm (AODD) pumps. It is the pre-assembled valve (main air valve, pilot valve, or spool valve depending on the exact part) that directs compressed air alternately to each side of the pump, making it self-reciprocating. Replacing the assembly as a unit restores correct valve timing without having to match individually worn components.
Genuine Yamada replacement parts are machined and molded to the original factory tolerances, so fit, alignment and seal engagement match the component being replaced. One per pump. Always compare the exact part number against your pump's nameplate before ordering, since Yamada varies internal components by both pump size and body material / elastomer combination.
Key Features
- Genuine Yamada replacement air valve assembly
- Fits NDP-40, NDP-50, NDP-80 series AODD pumps
- One per pump
- Molded or machined to factory tolerances for correct fit and seal engagement
Applications
- NDP-40, NDP-50, NDP-80 series AODD pump service and rebuilds
- Scheduled preventive maintenance
- Restoring lost flow, leaks, or erratic cycling
- Marine, industrial, chemical and wash-down service
Specifications
- Brand: Yamada
- Manufacturer: Yamada America
- Manufacturer Part Number: 805084
- Part Type: Air Valve Assembly
- Fits: NDP-40, NDP-50, NDP-80 Series
- Condition: New
Frequently Asked Questions
Q: Can I install this myself, or does it need a service technician?
Most Yamada AODD pump components are designed for field service with basic hand tools, following the torque sequence and reassembly order in the pump's maintenance manual.
Q: How do I know this is the right part for my pump?
Match the part number to the exact model and suffix on your pump nameplate, since Yamada pumps of the same nominal size can use different internal components depending on the body material and diaphragm elastomer ordered.
Q: Do I need any other parts to complete this repair?
Depends on what you are replacing this alongside. Anything the pump was disassembled to reach - gaskets, O-rings, seals - should be replaced as a set rather than reused, even if this is the only part that visibly failed.
Q: What symptoms suggest this component needs replacing?
Erratic cycling, stalling, unusual noise from the affected area, or visible wear, play, or damage on inspection are the usual signs that a specific internal component needs attention.
Not sure this is the right part? Send us a picture of your Pump Plate to https://www.clrmarine.com/Contact-Us and the CLR Marine team will confirm the correct air valve assembly.
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