Diaphragm pump

Abstract

A diaphragm pump which overcomes the problem of diaphragm failure due to overfill of the oil transfer chamber. An overfill preventive element in the form of a mechanical stop, a fully closed coil spring, or a valve system, or alternatives are provided.

Description

Diaphragm pump This application is a PCT International Application filed on May 13, 2004 in the name of Wanner Engineering, Inc., a U.S. corporation, and this application claims the U.S. Priority of patent application 10 / 439535. technical field The present invention relates generally to an improved diaphragm pump, and more particularly to an improved diaphragm pump including an anti-overfill element located on the hydraulic drive side of the diaphragm. Background technique The known rotary duty, oil supported / driven diaphragm pump is a high pressure pump capable of pumping many different liquids because in process fluids it has no sliding pistons or seals to damage. The diaphragm completely isolates the pump from the surrounding environment (process fluid), thereby protecting the pump from impurities. A diaphragm pump 20 is shown in its entirety in FIG. 1 . A pump 20 driven by a motor 21 has a drive shaft 22 rigidly secured in a pump housing 24 by a large tapered roll...

AI Technical Summary

Problems solved by technology

However, since the ball check valve 32 prevents any discharge through the valve port, it is only vented around the piston and housing

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