Yamada 802971 Diaphragm Pump Air Valve Block Assembly

Description:

The Yamada 802971 Air Valve Block Assembly is a pneumatic control component used in air-operated double diaphragm (AODD) pump systems to regulate and distribute compressed air for diaphragm actuation. It is commonly used in Yamada NDP-40, NDP-50, and NDP-80 series pumps where precise air switching is required for continuous pumping operation. Maintenance teams, OEMs, and integrators purchase this assembly for replacement of worn air valve blocks, preventative maintenance, and restoration of proper pump cycling and efficiency.

Applications:

The Yamada 802971 air valve block assembly is used in industrial fluid handling environments where AODD pumps are required for reliable, continuous-duty operation. It is commonly deployed in chemical processing, wastewater treatment, coatings, and bulk fluid transfer systems where consistent air distribution ensures stable diaphragm movement, reduced pulsation, and improved system longevity.

Technical Specifications:

• Manufacturer: Yamada Corporation
• Part Number: 802971
• Product Type: Air valve block assembly
• Function: Controls and distributes compressed air for diaphragm actuation
• Application: AODD diaphragm pumps (NDP-40 / 50 / 80 series)
• Operation: Pneumatic air shifting valve system
• Components: Valve body, caps, springs, spool assembly, seals
• Installation: Internal air valve section of pump
• Weight: ~8 lbs (approx)
• System Role: Drives alternating diaphragm motion for fluid transfer
• Compatibility: Yamada diaphragm pump systems
• Duty Cycle: Continuous operation
• Status: Active OEM replacement part

Common Replacements:

• Yamada 802971-SVT
• Yamada 802971-P1
• Yamada air valve repair kits