Dave’s Corner: AD Dampener Control

Yamada makes an automatic pulsation dampener, known as the AD Series Dampener. The AD Series Dampener is self adjusting and runs off the same regulated air supply that powers the pump.

In most situations, the dampener does not need an air regulator of its own. However, there may be times when a separate air regulator for the pulsation dampener is helpful.

An example of this would be using an NDP-40BAN with an AD-40AN pulsation dampener. When running at 90 GPM at 50’ TDH (22 PSI) the air requirements are 100 PSI air pressure and 100 SCFM air volume.

dampener diagram

Running at that point on the performance curve generates a difference between the air pressure and the discharge pressure of 78 PSI. With the differential pressure being that high the dampener will consume more than the normal amount of air.

The solution to the pulsation dampeners high air consumption is to install an air regulator in the dampener air line (see Fig. 0.1). We recommend setting the dampener air pressure 10% above the discharge pressure. So with a discharge pressure of 22 PSI, adjust the dampener air pressure to 24 PSI.

Dave’s Corner: High Pressure Pumps

The installation of a Yamada high pressure pump is the same as a standard Yamada Air-Operated Double Diaphragm pump. The bottom port is the liquid suction; the top port is the liquid discharge, etc. The main difference is the pumps ability to generate twice as much discharge pressure as air pressure, a 2 to 1 ratio.

If using hose or light duty piping on the discharge of a high pressure pump, you must make sure that it will be able to stand up to the higher discharge pressure. High pressure pumps will generate more pulsation than a standard AODD pump. With this in mind it is recommended that a suction stabilizer and a pulsation dampener be used with any high pressure pump.

The sizing of a pulsation dampener for a high pressure diaphragm pump is different from a standard AODD pump due to the fact that a high pressure pump is a simplex pump, rather than a duplex pump. The working volume of a pulsation dampener for a high pressure pump should be 5-10 times the working volume of the pump. When using a high pressure pump, you cannot use an automatic dampener. You will need to use a manually adjustable or chargeable dampener on the discharge side and chargeable only on the suction side of the pump. In place of a pulsation dampener, a stand pipe may be used. Consult Yamada for help in selecting the proper dampener.

high pressure pump performance curve

High pressure pumps are available in metal only.
These pumps are available in the NDP-20 (3/4”) series size and larger. PTFE diaphragms are not available in the high pressure pumps and a shortened diaphragm life should be expected. For questions or technical assistance, please contact Yamada.

Useful information on Yamada pumps and pump accessories

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