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Yamada® Patented Non-Lubricated Air Valve
with Non-centering Stall-free Spring
Incorporated in every Yamada Air Powered Double Diaphragm pump.

Yamada air valve technology is the heart of the air-powered double diaphragm pump and determines reliability. Yamada holds three patents on its field proven valve and enjoys a superior reputation throughout the industry.

yamada air valve

fits models:
and NDP-32

fits models:

Unified Air Valve Concept

Yamada offers two common-size air valve assemblies (shown at right) within six sizes of pumps, further reducing reassembly confusion and parts inventory. Other air-powered double diaphragm pump manufacturers offer multiple air valve designs and revisions in an effort to address pump reliability problems. Multiple designs and revisions typically create maintenance rebuild issues, parts confusion, and obsolete inventory.

Whether your pumps are functioning continuously or intermittently—at high or low pressure—using dirty or clean air—Yamada offers one field proven design.

Truly Non-Lubricated
Air Valve

The patented Yamada® Air Valve on all NDP series pumps never requires lubrication or pre-packing. The advanced design eliminates the need for external lubrication, which can lead to pumpage contamination and maintenance headaches. Yamada is proud to be the originator of non-lubricated air valve technology for air-powered double diaphragm pumps.

Some air-powered double diaphragm pump manufacturers claim to offer a non-lubricated air valve. Dependent upon the competitor’s design, the air valve will probably require lubrication for continuous operation, or lubricator installation if moisture is present within the air system. These valves are pre-packed with grease and are not truly non-lubricated.


A patented non-centering, spring-assisted shifter is incorporated into every NDP Series pump, ensuring a positive shift every time. The 304 stainless steel C-springs provide exceptional durability and longevity and are tested to last over 300 million cycles! The spring assist also aides in long dead head applications for reliable startup.

Common-size air valve assemblies reduce parts confusion.

Component Replaceable

All Yamada air valves can be restored with individual components, without requiring complete valve and housing replacement. Many competitor air valves incorporate a complicated design which requires complete replacement of the valve assembly and housing, further increasing the cost of ownership.



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