Yamada 771633 Valve Seat, Kynar for NDP-15
The Yamada 771633 is the genuine valve seat for NDP-15 Series pumps with Kynar wet ends. It is the machined ring the check ball drops onto, and the line where ball and seat meet is what actually seals the fluid chamber at the end of each stroke.
The material of the seat has to suit the duty. Aluminum suits general transfer, stainless steel suits abrasive and aggressive product, and polypropylene and Kynar suit chemical service where metal is not an option. Keep the seat, the ball and the wet end compatible with each other and with the fluid.
Key Features
- Genuine Yamada replacement valve seat
- Material: Kynar (PVDF)
- Fits NDP-15 Series pumps with Kynar wet ends
- 4 per pump in a standard pump build
- Restores check valve sealing and suction lift
- Replace together with the matching check balls
Applications
- NDP-15 Series pumps with Kynar wet ends
- 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: 771633
- Part Type: Valve Seat
- Material: Kynar (PVDF)
- Fits: NDP-15 Series pumps with Kynar wet ends
- Quantity Used: 4 per pump
- Series Port Size: 1/2 in on the NDP-15 Series
- Condition: New
Frequently Asked Questions
Q: Does the seat O-ring need replacing too?
Yes, whenever the seat is disturbed. It is already out, it is inexpensive, and a seat that seals perfectly can still leak around its outside diameter.
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.
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
