DAVID HOLLEN

Lately we have seen several pump failures due to improperly installed shaft cushions (p/n 770582). We have noticed that the problem occurs when a shaft cushion is installed in a pump that does not require it.

Often, we get a request for a Pulsation Dampener with ANSI Flanges, rather than the standard NPT port. Yamada only offers the ANSI Flange port option on the AD-25 and AD-40 series dampeners.

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.

When we refer to EX-Air Valves we are talking about electrically controlled shuttle valves as opposed to a pump that uses a c-spool piloted by an air signal from the pilot valve. The EX-Air Valve is available on all pumps except the NDP-5 and NDP-15 series pumps.

There seems to be some confusion regarding what center rod is used with the various diaphragms. Hopefully this article, and the chart below will add some clarity to this issue.

All Yamada diaphragms are rated to 100 PSI maximum and in many applications are run at pressures greater than 100 PSI without incurring diaphragm damage.