{"id":15580,"date":"2024-03-06T16:08:40","date_gmt":"2024-03-06T19:08:40","guid":{"rendered":"https:\/\/omel.com.br\/diferenca-entre-bomba-dosadora-de-diafragma-e-de-pistao\/"},"modified":"2026-08-18T10:40:26","modified_gmt":"2026-08-18T13:40:26","slug":"difference-between-diaphragm-piston-metering-pumps","status":"publish","type":"post","link":"https:\/\/omel.com.br\/en\/bombas-dosadoras-en\/difference-between-diaphragm-piston-metering-pumps\/","title":{"rendered":"Difference Between Diaphragm and Piston Metering Pumps"},"content":{"rendered":"\n
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What Is a Metering Pump?<\/h2>\n\n\n\n

A metering pump<\/strong> is a precision device used whenever exact quantities of a fluid need to be pumped into a process, with defined volume and timing.<\/p>\n\n\n\n

Also known as controlled-volume pumps<\/strong>, they can be used not only as pumps but also as flow meters and\/or control elements, solving a wide variety of challenges in chemical processing.<\/p>\n\n\n\n

As final control elements<\/strong>, they can be electrically or pneumatically controlled by remote or automatic process-control instruments. Compared with conventional control valves, they offer superior linearity, accuracy, and operating range.<\/p>\n\n\n\n

There are two main types of metering pumps: piston metering pumps<\/strong> and diaphragm metering pumps<\/strong>.<\/p>\n\n\n\n

In this article, we will present the main differences between them.<\/p>\n\n\n\n

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Piston metering pumps <\/h2>\n\n\n\n
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Piston Operating Principle<\/strong><\/h3>\n\n\n\n

Piston metering pumps are positive displacement pumps that use a piston to displace fluid within the pumping chamber. The pumping chamber determines the flow rate and the amount of liquid to be delivered.<\/p>\n\n\n\n

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Figure 1 \u2013 Piston Suction and Discharge Motion<\/p>\n<\/div>\n\n\n\n

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The fluid passes through the inlet and outlet check valves. When the piston retracts, a vacuum is created inside the pumping chamber, opening the inlet check valve and allowing the fluid to enter the chamber (see Figure 1).<\/p>\n<\/div>\n<\/div>\n\n\n\n

Once the pumping chamber is full, the piston performs its discharge stroke and pushes the liquid out through the outlet check valve.<\/p>\n\n\n\n

Applications of Piston Metering Pumps<\/strong><\/strong><\/h3>\n\n\n\n

OMEL NSP\/P metering pumps<\/strong> are piston metering pumps designed for use in severe chemical processes, such as pumping chemical slurries, viscous liquids, high-temperature fluids, and corrosive products.<\/p>\n\n\n\n

\"Bomba<\/figure>\n\n\n\n

Figure 2 \u2013 OMEL NSP\/P Metering Pump<\/p>\n\n\n\n

Capable of generating high discharge pressures, piston metering pumps are ideal for applications that require elevated pressures, such as water treatment systems and offshore oil platforms, for example.<\/p>\n\n\n\n

The DMP model<\/strong> is a compact, robust piston metering pump with a monoblock design that allows modular assembly of up to 6 heads.<\/p>\n\n\n\n

\"Bomba<\/figure>\n\n\n\n

Figure 3 \u2013 OMEL DMP Metering Pump<\/p>\n\n\n\n

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Advantages of the OMEL NSP\/P Metering Pump<\/strong><\/h3>\n\n\n\n