Foreign long-distance pipeline transportation, the traditional is the use of reciprocating pumps, such as piston pumps, piston pumps. The structure of this type of pump is relatively complex and difficult to maintain. Because the slurry directly enters the pump body, the service life of the wearing parts is shortened and the maintenance cost is high. In the late 1950s, Japan's Hitachi Manufacturing Co., Ltd. developed the first horizontal water isolation pump for long-distance transmission and achieved success. In the 1960s and 1970s, Japan developed the first vertical water isolation pump for use in alumina plants and achieved success. In the late 1970s, the United States, Canada, Australia, West Germany, and the United Kingdom had scored dozens of patent registrations for this kind of pump. In 1976, the first diaphragm piston pump manufactured by Holland HOLTHUIS was introduced. This pump uses a rubber diaphragm to separate the oil from the pulp, effectively preventing the solid particles from entering the pump cylinder and thus having a longer service life than the piston pump and plunger. The pump has been significantly improved, reducing maintenance costs. At present, the GEHO pump manufactured by the Netherlands, which is a diaphragm piston pump, has spread over a dozen countries in the world.
At present, there are only a few foreign membrane pump manufacturers, including HOLTHUIS in the Netherlands, Wiener in Germany, EMMERICH, FELUMA, and WILSON SNYDER in Canada. Among them, HOLTHUIS has the highest market share in the world. The market shares of WITHER and WILSON SNYDER have been reduced in recent years, and the competitiveness of products has been weakened. EMMERICH's products are concentrated in the alumina market. FELUMA's products are in the marketing stage. In recent years, HOLTHUIS has launched large-flow, high-pressure pump models, which have greatly improved computer control, wearing parts life, power end structure, and safe and reliable operation. WITHER, WILSON SNYDER, and EMMERICH have not seen the introduction of new products in recent years. The hose-diaphragm pump introduced by FELUMA has a great breakthrough in structure and principle. It is another development direction. At present, it is only lacking more industrial practices to improve and further occupy the market.