In August of 2008 the NDP-20 / NDP-25 series pumps came with a new style diaphragm which has an o-ring molded into the air side. This change was made for two reasons:
To prevent air leaks where the diaphragm contacts the air chamber. To prevent a diaphragm from pulling out of place if there is excessive air pressure. On the thermoplastic diaphragms (TPO, TPE, PTFE), there is no o-ring molded in the diaphragm. Instead a separate o-ring is used to fill the o’ring groove in the air chamber wall. The new style diaphragms cannot be used in the old style pumps, however the old style diaphragms can be used in the new style pump when used with the air chamber wall o-ring. The old style diaphragm will continue to be available for a few more years.
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I often receive phone calls from end users about diaphragm cycle life and the first few questions I ask are:
Operating a larger pump at half throttle would extend the diaphragm life, consume less air consumption and overall provide less wear and tear on the equipment. |
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March 2023
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