Yamada 590086 Valve Seat for NDP-20
The Yamada 590086 is a factory valve seat used in NDP-20 Series pumps. Four are fitted to a standard pump, and each one takes the impact of a ball landing on it on every single stroke the pump makes.
A worn seat and a worn ball produce the same symptoms: falling output, slow priming, and product draining back down the suction line when the pump stops. Because they wear as a pair it is normal to replace them as a pair, and the seat O-ring underneath should go back new as well since it is already out.
Key Features
- Genuine Yamada replacement valve seat
- Fits NDP-20 Series pumps
- 4 per pump in a standard pump build
- Restores check valve sealing and suction lift
- Replace together with the matching check balls
Applications
- NDP-20 Series pumps
- Liquid end rebuilds after abrasive service
- Restoring flow lost to a grooved or bruised seat
- Scheduled wet end overhauls
- Repairing a pump that drains back when stopped
- Marine, industrial and chemical transfer duty
Specifications
- Brand: Yamada
- Manufacturer: Yamada America
- Manufacturer Part Number: 590086
- Part Type: Valve Seat
- Fits: NDP-20 Series pumps
- Quantity Used: 4 per pump
- Series Port Size: 3/4 in on the NDP-20 Series
- Condition: New
Frequently Asked Questions
Q: Why did the seat wear so fast?
Abrasive solids are the usual answer, along with running at higher air pressure than the duty needs, which increases the speed the ball strikes the seat on every stroke.
Q: Can I mix seat materials in one pump?
Do not. All four check valves should be the same material so they wear at the same rate and share the duty evenly.
Q: How do I inspect a valve seat?
Take it out and look across the seating face under a good light. A serviceable seat shows an even, continuous witness line where the ball sits. A groove, a dent or a break in that line means it will leak.
Q: Can a valve seat be lapped instead of replaced?
On a metal seat you can improve a lightly marked face, but removing material changes where the ball sits and how much lift it has. On plastic seats it is not practical at all.
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 valve seat.
CLRMarine
