Product Description
Yamada NDP-500BST-NPT Air Operated Double Diaphragm Pump with 2" NPT Ports, Stainless Steel Construction and PTFE Diaphragms is ideal for a wide variety of processing applications - Model 855401
NDP-500BST-NPT Pump Materials of Construction:
- Body Material: Stainless Steel
- Elastomer Material: PTFE
- Air Motor: Aluminum (standard on metal pumps)
| Manufacturer Part Number | NDP-500BST NPT |
| SKU | 855401 |
| Max Flow | 226 GPM |
| Air Supply Pressure | 20 - 125 PSI |
| Discharge Volume per Cycle | 0.70 gallons |
| Diaphragm Temperature Range | 40 - 212°F (4 - 100°C) |
| Maximum Solids | 5/16" |
| Ports | 2" NPT |
| Air Inlet | 3/4" Female NPT (includes ball valve) |
| Air Exhaust | 1" Female NPT (includes silencer) |
| Overall Dimensions | 17" L x 12.84" W x 29.31" H |
| Shipping Weight | 144 lbs. |
Bill of Materials: Download
Data Sheet: Download
Pump Drawing: Download
Technical Bulletin: Download
Suggested applications
Fluid transfer in chemical, paint, adhesive, wastewater and general industrial process applications.
Viscous, abrasive or flammable liquids such as paints, polymers, acids, solvents, slurries and powder/liquid mixes.
The ability to handle challenging fluids and deadhead without damage makes these pumps ideal for dosing, mixing, filter press feed and general fluid transfer.
Other Details
Yamada's NDP-500 stainless steel 2" AODD pumps provide up to 226 GPM max flow with 20 - 125 PSI air supply. This 2" NPT configuration uses PTFE diaphragms on Yamada's next-generation NDP-500 platform.
- Highest-flowing 2" diaphragm pump in the market.
- Geometric optimizations improve efficiency and reduce operating cost by running slower.
- Uses the same diaphragms, balls, seats and field-proven NDP air motor, simplifying upgrades and spare-parts inventory.
- One universal fastener and square flanges help speed maintenance and reassembly.
Download Full Yamada Pump Catalog
Engineered for High Performance and Long Life.
Rugged, Bolted Construction
All Yamada pumps feature bolted construction, which eliminates leaks and simplifies post-maintenance reassembly. Bolted construction is superior to clamp band retainers, which frequently require frustrating, unnecessary leakage rebuilds from misalignment during reassembly.
Outside-Accessible Air Valve
Inspection or maintenance of every Yamada air valve may be performed without removing the pump from service. Outside accessible, making it easy to fix and inspect.
Unified Air Valve Concept
Common-size air valve assemblies reduce parts confusion and inventory.
Pilot Valve
Unique to the Yamada design is an individual modular pilot valve that actuates the air valve. It is depressed slightly by the inner center disk creating a pressure drop at one end of the air valve, allowing shifting to occur. It is maintenance free with no cumbersome snap rings or lubricated dynamic o-rings to replace or repair.
What separates Yamada from the rest of the pack is the air valve technology. Yamada air valve technology is the heart of the air-powered double diaphragm pump and determines reliability. Yamada NDP series pumps use a completely non-lubricated main air valve and independent pilot mechanisms to control the air logic, called a C-spool ensures stall-free operation throughout product life.
Yamada holds three patents on its field proven valve and enjoys a superior reputation throughout the industry.
How Yamada AODD Pump Air Valve C-Spool Works
- As compressed air enters the pump, it is directed via the main air valve to one side or the other, depending upon the starting position of the c-spool.
- As the air enters the chamber, it forces the diaphragm outward.
- This outward momentum forces liquid out of the discharge ball valve and loads the opposite inlet ball valve.
- As the diaphragm travels outward, the connected diaphragm on the opposite side is pulling the diaphragm inward.
- When it travels a full stroke, it will contact the pilot valve, depressing it and breaking the seal to open an exhaust port.
- The open port allows the compressed air to the exhaust from the back side of the air valve. The pressure drop produces a shift of the main air valve.
- This motion simply repeats on the other side.
Yamada's One-Year Limited Warranty
Yamada air operated diaphragm pump series are warranted by YAMADA to the original user against defects in workmanship or materials under normal use for one year from date of purchase. Download Yamada Warranty
