--- title: Positive Displacement Pumps for High Viscosity | EV Pump & Equipment description: Learn about positive displacement pumps, how they work, types available, and why they’re ideal for handling high-viscosity fluids in various industries. image: https://evpmp.co/hubfs/Blog%20Feature%20Images/Positive%20Displacement%20Pumps%20The%20Ideal%20Solution%20for%20High-Viscosity%20Fluids%20(1)-2.png --- [Skip to the main content.](https://evpmp.co/blog/positive-displacement-pumps-the-ideal-solution-for-high-viscosity-fluids#main-content) [![WHITE\_TRANSAPRENT\_CROPPED](https://evpmp.co/hs-fs/hubfs/Logo/WHITE_TRANSAPRENT_CROPPED.png?width=1895&height=1060&name=WHITE_TRANSAPRENT_CROPPED.png "WHITE_TRANSAPRENT_CROPPED")](https://evpmp.co) [![Horizontal Logo - EV Pump](https://evpmp.co/hs-fs/hubfs/Logo/Horizontal%20Logo%20-%20EV%20Pump.png?width=7042&height=500&name=Horizontal%20Logo%20-%20EV%20Pump.png "Horizontal Logo - EV Pump")](https://evpmp.co) - [About](https://evpmp.co/about-us) - [About Us & Our Team](https://evpmp.co/about-us) - [Brands We Support & Service](https://evpmp.co/pump-brands) - [Industries We Serve](https://evpmp.co/about-us#industries) - FAQ Coming Soon! 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## Comprehensive Pump & Equipment Solutions ### **If it rotates, moves fluid, or needs fixing, we’ve got it covered.** From pump repair and rebuilds to custom machining and hard-to-source parts, we’re the team you call when no one else can figure it out. ##### Learn More - [Custom Pump Design](https://evpmp.co/custom-fluid-handling-systems) - [Repair, Replacement & Rebuilds](https://evpmp.co/pump-repair-replacement-rebuild) - [Preventative Maintenance](https://evpmp.co/pump-maintenance) - [Outsourced Service Work](https://evpmp.co/outsourced-service-work) ##### Contact Us for - [Equipment Rentals](https://evpmp.co/contact-us) - [Pump Sales & System Components](https://evpmp.co/contact-us) - [Other Equipment Repair](https://evpmp.co/contact-us) - [Custom Machining & Hard-to-Find Parts](https://evpmp.co/contact-us) - [Mobile Services](https://evpmp.co/contact-us) ## **"** We believe our impact goes beyond pumps. The energy and industrial sectors are crucial to global development, and we’re proud to contribute with our expertise and broad vision. \- Clark Edwards, Owner ##### Our Resources - [Case Studies](https://evpmp.co/blog/tag/case-studies) - [Our Blog](https://evpmp.co/blog) - [About Fluid Handling Systems](https://evpmp.co/fluid-handling-systems) - [About C-Pumps](https://evpmp.co/fluid-handling-systems/centrifugal-pump) - [View All Resources](https://evpmp.co/resources) 6 min read # Positive Displacement Pumps: Ideal Solution for High-Viscosity Fluids [![Picture of EV Pump](https://evpmp.co/hubfs/Logo/EV%20Round%20Badge%20-%20EV%20Pump%20(2000%20x%202000%20px)%20(2)%20(1).png) EV Pump](https://evpmp.co/blog/author/ev-pump) : Updated on September 20, 2026 [Positive Displacement Pumps](https://evpmp.co/blog/tag/positive-displacement-pumps) [High-Viscosity](https://evpmp.co/blog/tag/high-viscosity) **Table of Contents** [What is a PD Pump](https://evpmp.co/blog/positive-displacement-pumps-the-ideal-solution-for-high-viscosity-fluids#definition) [How it Works](https://evpmp.co/blog/positive-displacement-pumps-the-ideal-solution-for-high-viscosity-fluids#how-they-work) [Types of PD Pumps](https://evpmp.co/blog/positive-displacement-pumps-the-ideal-solution-for-high-viscosity-fluids#types) [PD Pump vs C-Pump](https://evpmp.co/blog/positive-displacement-pumps-the-ideal-solution-for-high-viscosity-fluids#pd-pump-vs-c-pump) [Key Advantages](https://evpmp.co/blog/positive-displacement-pumps-the-ideal-solution-for-high-viscosity-fluids#advantages) [Running Against a Closed Valve](https://evpmp.co/blog/positive-displacement-pumps-the-ideal-solution-for-high-viscosity-fluids#closed-valve) [Viscosity & PD Pumps](https://evpmp.co/blog/positive-displacement-pumps-the-ideal-solution-for-high-viscosity-fluids#viscosity) [Industries](https://evpmp.co/blog/positive-displacement-pumps-the-ideal-solution-for-high-viscosity-fluids#industries) [What To Consider](https://evpmp.co/blog/positive-displacement-pumps-the-ideal-solution-for-high-viscosity-fluids#when-making-a-selection) [Maintenance & Troubleshooting](https://evpmp.co/blog/positive-displacement-pumps-the-ideal-solution-for-high-viscosity-fluids#maintenance-tips) [The Future of PD Pumps](https://evpmp.co/blog/positive-displacement-pumps-the-ideal-solution-for-high-viscosity-fluids#future-of-fluid-handling-solutions) [Custom Solutions for Your Project](https://evpmp.co/blog/positive-displacement-pumps-the-ideal-solution-for-high-viscosity-fluids#custom-solutions) | Positive displacement pumps aren't the right tool for every job, but when you're moving thick, viscous, or chemically aggressive fluids, they're often the only tool that works. In this post, we'll break down how PD pumps work, the different types available, when to choose one over a [centrifugal pump](https://evpmp.co/fluid-handling-systems/centrifugal-pump), and what to consider when selecting one for your application. | | --- |   When it comes to fluid handling systems, [positive displacement pumps](https://evpmp.co/fluid-handling-systems) are indispensable in many industries, especially when dealing with high-viscosity fluids. These pumps offer unparalleled precision and reliability, making them ideal for applications that require consistent fluid flow, even under varying pressures. Let's explore the ins and outs of positive displacement pumps. ⚡ What are they, ⚡ how do they work, ⚡ what types are available, ⚡ and why are they the preferred choice for handling thick and viscous fluids?   [![What are fluid handling systems? Learn more!](https://no-cache.hubspot.com/cta/default/47288386/interactive-184002220408.png)](https://evpmp.co/hs/cta/wi/redirect?encryptedPayload=AVxigLLBUgNcBQpF4%2FCk9V2reYFi2OHRC2QPKFDF%2Ftf8M05w9twXtWRBQW1tlW9OPFbs8qzThDp3nwPLkyIsyhqfEdpNjEUl0QIFppI8n3o8bGQJdbTH42cT8CkFSKuOcHSyHQg8TYwLOcUnbkxxijUiH%2BfhiJlPbIOjVhUSy5wtIkFly%2FPiGMvkPwpogg%3D%3D&webInteractiveContentId=184002220408&portalId=47288386)     ## [What is a positive displacement pump?](https://evpmp.co/fluid-handling-systems/positive-displacement-pump) A pump that traps a fixed volume of fluid and moves it through the system with each cycle, delivering consistent flow regardless of discharge pressure. A positive displacement pump is a type of pump that moves a fixed amount of fluid with each cycle. Unlike centrifugal pumps, which rely on the conversion of kinetic energy into pressure to push fluid, positive displacement pumps operate on the principle of moving a set volume of fluid regardless of the system’s pressure. The core function of these pumps is to ensure that the flow remains constant and continuous, by using [charge pumps](https://evpmp.co/blog/charge-pumps-essential-for-maintaining-optimal-pump-performance) to prevent cavitation, which is especially critical when handling high-viscosity fluids like oils, slurries, or thick chemicals. The key advantage of positive displacement pumps is their ability to handle fluids that may be too thick or dense for [centrifugal pumps](https://evpmp.co/blog/centrifugal-pumps-the-heart-of-fluid-handling-systems). They offer precise control over flow, making them ideal for applications that demand accuracy and consistency.   ## **How do positive displacement pumps work?** The mechanism is straightforward: a chamber inside the pump expands to draw fluid in, then contracts to force it out. That action - trap, move, discharge - repeats on every cycle. The volume displaced stays constant regardless of what's happening with pressure downstream. The specific way that chamber moves depends on the pump type. Reciprocating pumps use a back-and-forth motion. Rotary pumps use a spinning element. Each design has tradeoffs in pressure capability, viscosity handling, and application fit, all covered in the next section.     ## What types of positive displacement pumps are there? The two main categories are reciprocating (piston, plunger, diaphragm) and rotary (gear, screw, lobe). In oilfield and well service, triplex and duplex plunger pumps are the most common. Each is designed to handle different applications and fluid types: ### 1. Reciprocating Positive Displacement Pumps #### Piston Pumps Piston pumps use a cylindrical piston moving back and forth inside a cylinder to displace fluid. They're well-suited for moderate-to-high pressure applications and are commonly found in pressure washers, hydraulic systems, and general industrial service. *Injection pumps* — used to deliver precise amounts of fuel or chemicals into a system under high pressure — are a specialized type of piston pump. In diesel engines, they control the timing and pressure of fuel delivery into the combustion chamber. In industrial settings, they're used for chemical dosing and process control. #### Plunger Pumps Plunger pumps are similar to piston pumps but use a smooth, fixed-diameter plunger that passes through a seal rather than riding inside the cylinder wall. This makes them better suited for sustained high-pressure applications and more resistant to wear. They're the standard in oilfield services, well drilling, high-pressure cleaning, and [chemical injection](https://evpmp.co/blog/chemical-metering-pump-vs-injection-pump). ##### *Triplex Pumps* Three plungers operating in a single-acting configuration. The most common configuration in modern drilling operations — smoother flow, less pulsation, more compact, and lower operating cost than duplex. ##### *Duplex Pumps* Two plungers in a double-acting configuration, moving fluid on both the forward and return stroke. An older design still in service for lower-pressure applications and legacy equipment. ##### [Mud Pumps](https://evpmp.co/fluid-handling-systems/mud-pump) [Mud pumps](https://evpmp.co/blog/what-is-a-mud-pump) are heavy-duty reciprocating pumps, typically triplex or duplex plunger configurations, specifically built to handle thick, abrasive drilling fluids, slurries, and other heavy materials. Common in oilfield drilling, mining, and construction, they're designed for continuous-duty operation in harsh environments. They circulate drilling fluid under high pressure to cool and lubricate the drill bit and carry cuttings back to the surface. Their robust construction handles the viscous, abrasive fluids that would quickly destroy a standard pump. #### [Diaphragm Pumps](https://evpmp.co/blog/how-does-a-diaphragm-pump-operate-in-fluid-handling-solutions) Diaphragm pumps use a flexible membrane to move fluid, keeping it completely isolated from the mechanical components. They're ideal for hazardous, abrasive, or corrosive fluids and offer excellent control over flow. Available in air-operated (AODD), electric, and hydraulically actuated configurations.   ### 2. Rotary Positive Displacement Pumps #### Gear Pumps [Gear pumps](https://evpmp.co/blog/how-ev-pump-selected-a-gear-pump-for-aerions-arm-system), including external and internal gear designs, are widely used for transferring high-viscosity fluids like oils, lubricants, and chemicals. They provide steady, continuous flow and are highly reliable in clean, non-abrasive fluid service. #### Screw Pumps Screw pumps use a helical screw mechanism to move fluid axially through the pump body. They handle medium-to-high viscosity fluids well, including slurries and thick chemicals, with low pulsation and minimal shear on the fluid. #### Lobe Pumps Lobe pumps use two counter-rotating lobes to trap and gently move fluid through the pump. Because the lobes never make contact with each other, there's no metal-to-metal wear. They're the preferred choice in food processing, pharmaceuticals, and other sanitary applications where gentle fluid handling and easy cleanability matter. #### Peristaltic Pumps [Peristaltic pumps](https://evpmp.co/blog/peristaltic-pump-hose-materials) move fluid by squeezing a flexible hose with rotating rollers — the fluid never touches anything but the inside of the hose. That makes them the right call for abrasive slurries, corrosive chemicals, and shear-sensitive fluids, since there are no seals or valves in the fluid path to wear out or clog. The hose is the only wear part, and swapping it is straightforward.   --- ### Case Study Highlight #### [How EV Pump Built a Chemical Injection Skid for Turbo Chem](https://evpmp.co/blog/how-ev-pump-built-a-chemical-injection-skid-for-turbo-chem) The project included a full 3D model, upgraded metallurgy and piping, and a high-pressure Udor triplex pump package driven by a Yanmar diesel engine. [![EV Pump and Equuipment: Case Study - How EV Pump Built a Chemical Injection Skid for Turbo Chem](https://no-cache.hubspot.com/cta/default/47288386/interactive-206078505585.png)](https://evpmp.co/hs/cta/wi/redirect?encryptedPayload=AVxigLJOr%2FMrxVzt%2BjE6L9kDah1CFdOE0Z7eleMU8lFoTZR79bsk0TBG5G%2BQFgIF2dFK%2FK7%2Bx5DqCn%2FiB0Hak%2FC7JcbIX9TZdEVGu08cuyM22HQgGc0AQS7zsI%2FyrE%2FDlVP%2FcoDuac9gh1OUYtwmhnHPtHs9q3bVt%2FmhdBY4Ol9xjymubXbmHeu%2F6rPE6Hh57fUf6MQJhZZ%2FD6JkGY4El43Io8OKgHs2NogyLZbhVv0zwcbKGysj&webInteractiveContentId=206078505585&portalId=47288386)   --- ## When should you use a positive displacement pump instead of a centrifugal pump? When fluids are highly viscous, when precise metering is required, when pressures are high, or when flow must remain constant regardless of system pressure changes.   ## What are the key advantages of positive displacement pumps? Positive displacement pumps offer several key advantages that make them ideal for handling high-viscosity fluids: - Precise Flow Control: They deliver a constant and accurate flow regardless of pressure variations, making them ideal for applications where flow consistency is critical. - High Efficiency with Viscous Fluids: Unlike centrifugal pumps, positive displacement pumps are highly efficient in handling high-viscosity fluids such as oils, slurries, and thick chemicals. - High Pressure Capabilities: Positive displacement pumps can operate effectively under high pressure, making them ideal for industries like oil & gas and chemical processing that require reliable, high-pressure fluid transport. - Versatility: These pumps can handle a wide range of fluids, including thin and thick liquids, chemicals, slurries, and hazardous materials, making them highly versatile across various industries.     ## Can a positive displacement pump run against a closed valve? No, this is dangerous. Without a pressure relief valve, deadheading a positive displacement pump will cause pressure to build until a component fails. Always install a relief valve on the discharge side.     ## How does viscosity affect a positive displacement pump? Unlike centrifugal pumps, PD pumps perform better with higher-viscosity fluids. Flow rate remains relatively constant, though higher viscosity requires more motor horsepower and increases suction requirements.   [![E5 Pump and Equipment: Your Backlog Is Costing You Money. When your shop is full, don't turn down work — hand it off. We step in as your service partner so you keep the customer and pocket the profit. Message Clark](https://no-cache.hubspot.com/cta/default/47288386/interactive-209123762803.png)](https://evpmp.co/hs/cta/wi/redirect?encryptedPayload=AVxigLIo3WYUjlR2FmqcxRsBJ9hmT1JDWglaGWhkcNg0UqYvyjNXYtG1ErxyDYz8BeQtw8vzjVE%2FsIC8290S0bseLs7vcIujvk5nROWo8iDS91fMwbSzhEpnnqJMDhXeI0gKbnISLz7UJXIzQxWmHeKyPSjgTO9DYUO6KsHyES7l%2Bhli6taDdYPxX%2FvihY0%3D&webInteractiveContentId=209123762803&portalId=47288386)   ## What industries use positive displacement pumps? Oil and gas drilling, well servicing, chemical processing, cement pumping, frac operations, pipeline pigging, pressure testing, and municipal water systems. Some common applications include: ![Oil & Gas](https://evpmp.co/hs-fs/hubfs/Icons/Oil%20%26%20Gas.png?width=70&height=70&name=Oil%20%26%20Gas.png) ### [Oil & Gas](https://info.stonewallco.com/blog/top-10-trends-shaping-the-oil-and-gas-industry) Moving viscous oils, chemicals, and fluids in drilling and production operations, including mud pumps and water injection systems. ![Chemical Processing](https://evpmp.co/hs-fs/hubfs/Icons/Chemical%20Processing.png?width=70&height=70&name=Chemical%20Processing.png) ### Chemical Processing Transporting a wide range of chemicals, including aggressive, toxic, or high-viscosity substances before [storing liquids or gases](https://www.cypressfabrication.com/insights/everything-you-need-to-know-about-asme-pressure-vessels). ![cup with straw, taco and hamburger icon](https://evpmp.co/hs-fs/hubfs/Icons/Food%20%26%20Beverage.png?width=70&height=70&name=Food%20%26%20Beverage.png) ### Food & Beverage Moving viscous liquids like syrups, oils, and sauces without compromising consistency or quality. ![pill bottles and containers icon](https://evpmp.co/hs-fs/hubfs/Icons/Pharmaceuticals.png?width=70&height=70&name=Pharmaceuticals.png) ### Pharmaceuticals Handling sensitive liquids such as active pharmaceutical ingredients, where precise flow and hygiene are paramount. ![Water Treatment](https://evpmp.co/hs-fs/hubfs/Icons/Water%20Treatment.png?width=70&height=70&name=Water%20Treatment.png) ### [Water Treatment](https://www.cypressfabrication.com/insights/fabricating-water-treatment-equipment-for-oil-and-gas) Transporting chemicals for treatment, filtration, and other processes, such as [well pumps](https://evpmp.co/blog/do-you-need-a-well-pump-replacement-or-your-surface-pump-serviced), that require precise control over flow.     ## **What should you consider when making a positive displacement pump selection?** Choosing the right positive displacement pump for your application involves several key factors: ### Fluid Viscosity Select a pump designed to handle the thickness of the fluid being pumped. Higher viscosity fluids require more robust pumps like gear or diaphragm pumps. ### Pressure Requirements Determine the maximum pressure your application will require. Some pumps, like plunger pumps, are better suited for high-pressure environments. ### Flow Rate Ensure that the pump delivers the correct flow rate for your system’s needs. Positive displacement pumps are excellent for constant, reliable flow but need to match the system’s requirements. ### Material Compatibility Choose a pump that is compatible with the fluid’s chemical properties to prevent damage from corrosion or wear. **Read our blog for more information on [positive displacement pumps compared to other common pump types](https://evpmp.co/blog/which-pump-should-you-use-a-comparison-of-the-most-common-pump-types).**     ## **What are some maintenance and troubleshooting tips for positive displacement** ## **pumps?** To keep positive displacement pumps running efficiently, regular maintenance is necessary: - Routine Maintenance: Regularly inspect seals, replace worn parts, and ensure proper lubrication to extend pump life. - Common Issues: Look out for leaks, wear on seals, or decreased performance due to blockages or improper pressure. - How to Extend Pump Life: Clean the pump regularly, monitor fluid quality, and replace damaged parts promptly to prevent costly repairs or downtime.     ## **What does the future of fluid handling hold for positive displacement pumps?** The future of positive displacement pumps lies in efficiency and automation. Advances in smart technology and [IoT](https://www.vested.marketing/industry-talk/7-industry-examples-of-the-internet-of-things-iot) allow for real-time monitoring of pump performance, optimizing efficiency and reducing maintenance costs (see [IoT for industrial automation](https://info.stonewallco.com/blog/iot-for-industrial-automation)) - [ask a pump expert](https://evpmp.co/blog/who-is-ev-pump-equipment)! With increasing pressure for energy-efficient solutions, future pumps will focus on reducing power consumption while increasing durability, making them ideal for high-demand industries like oil & gas, water treatment, and food processing.     ## Do you need custom pump solutions for your project? Whether you’re handling slurries, oils, or chemicals, understanding how to choose the right positive displacement pump, [grinder pump](https://evpmp.co/fluid-handling-systems/grinder-pump), or [trash pump](https://evpmp.co/fluid-handling-systems/trash-pump), can significantly improve efficiency and performance in your systems. For expert guidance on selecting the right positive displacement pump for your application, contact [EV Pump & Equipment](https://evpmp.co/) today. Our team of professionals can help you find the most efficient, cost-effective solution to meet your needs.   [![Looking for this kind of refresh on your own fleet? Call Clark direct.](https://no-cache.hubspot.com/cta/default/47288386/interactive-193209205056.png)](https://evpmp.co/hs/cta/wi/redirect?encryptedPayload=AVxigLJUjjnSwlSMdoaDkj1SKpUKbMXfDa98ylfQf1JwTsdh6%2FtQjsmD8mRqpcWanahkdtlaGeMwOZJl6sBQ967ez1uLYfkfx5vnSpSOK44V0qBdDS8wre61m02jC3ki1T4fr4v1OAy6KRsbce0VxePfw1AI&webInteractiveContentId=193209205056&portalId=47288386) --- ![Logo - EV Pump & Equipment (5)](https://evpmp.co/hs-fs/hubfs/Logo/Logo%20-%20EV%20Pump%20%26%20Equipment%20(5).png?width=151&height=80&name=Logo%20-%20EV%20Pump%20%26%20Equipment%20(5).png) [EV Pump & Equipment](https://evpmp.co/) is a leading provider of high-performance fluid handling solutions, specializing in custom pump systems and comprehensive services for industries like oil & gas, petrochemical, and municipal water. With a deep passion for pumps and a commitment to excellence, we deliver reliable, efficient solutions tailored to meet the unique needs of every client. Our hands-on approach and elite equipment ensure that your operations run smoothly and efficiently, every time. - [Tweet](https://twitter.com/share) [![Common Applications of Centrifugal Pumps: How They Power Fluid Systems](https://evpmp.co/hubfs/Blog%20Feature%20Images/Common%20Applications%20of%20Centrifugal%20Pumps%20How%20They%20Power%20Fluid%20Systems%20(1).png)](https://evpmp.co/blog/common-applications-of-centrifugal-pumps-how-they-power-fluid-systems) 1 min read #### [Common Applications of Centrifugal Pumps: How They Power Fluid Systems](https://evpmp.co/blog/common-applications-of-centrifugal-pumps-how-they-power-fluid-systems) [![Picture of EV Pump](https://evpmp.co/hs-fs/hubfs/Logo/EV%20Round%20Badge%20-%20EV%20Pump%20(2000%20x%202000%20px)%20(2)%20(1).png?width=30&name=EV%20Round%20Badge%20-%20EV%20Pump%20(2000%20x%202000%20px)%20(2)%20(1).png) EV Pump](https://evpmp.co/blog/author/ev-pump) : Apr 2, 2025, 10:38:52 AM Centrifugal pumps show up in more places than most people realize, from the water coming out of your tap to the fluid systems keeping an... [Centrifugal Pumps](https://evpmp.co/blog/tag/centrifugal-pumps) [Read More](https://evpmp.co/blog/common-applications-of-centrifugal-pumps-how-they-power-fluid-systems) [![Understanding Horizontal Directional Drilling: Benefits & Applications](https://evpmp.co/hubfs/Blog%20Feature%20Images/Understanding%20Horizontal%20Directional%20Drilling%20Benefits%20%26%20Applications%20(1).png)](https://evpmp.co/blog/understanding-horizontal-directional-drilling-benefits-applications) 1 min read #### [Understanding Horizontal Directional Drilling: Benefits & Applications](https://evpmp.co/blog/understanding-horizontal-directional-drilling-benefits-applications) [![Picture of EV Pump](https://evpmp.co/hs-fs/hubfs/Logo/EV%20Round%20Badge%20-%20EV%20Pump%20(2000%20x%202000%20px)%20(2)%20(1).png?width=30&name=EV%20Round%20Badge%20-%20EV%20Pump%20(2000%20x%202000%20px)%20(2)%20(1).png) EV Pump](https://evpmp.co/blog/author/ev-pump) : Feb 7, 2025, 6:21:48 AM Horizontal directional drilling (HDD) has become an essential technique in modern construction and pipeline installation. With increasing demands for... [HDD](https://evpmp.co/blog/tag/hdd) [Read More](https://evpmp.co/blog/understanding-horizontal-directional-drilling-benefits-applications) [![What Is a Mud Pump? Uses, Benefits, and Key Applications](https://evpmp.co/hubfs/Blog%20Feature%20Images/What%20is%20a%20Mud%20Pump%20(1).png)](https://evpmp.co/blog/what-is-a-mud-pump) 1 min read #### [What Is a Mud Pump? Uses, Benefits, and Key Applications](https://evpmp.co/blog/what-is-a-mud-pump) [![Picture of EV Pump](https://evpmp.co/hs-fs/hubfs/Logo/EV%20Round%20Badge%20-%20EV%20Pump%20(2000%20x%202000%20px)%20(2)%20(1).png?width=30&name=EV%20Round%20Badge%20-%20EV%20Pump%20(2000%20x%202000%20px)%20(2)%20(1).png) EV Pump](https://evpmp.co/blog/author/ev-pump) : May 27, 2025, 5:11:26 PM Positive displacement pumps aren't the right tool for every job, but when you're moving thick, viscous, or chemically aggressive fluids,... 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Unlike centrifugal pumps — which rely on converting kinetic energy into pressure — PD pumps trap a set volume of fluid and force it through the system whether the fluid is thin, thick, or the pressure downstream is variable. This makes them the preferred choice for high-viscosity fluids like oils, slurries, and thick chemicals." }, "name" : "What is a positive displacement pump?" }, { "@type" : "Question", "acceptedAnswer" : { "@type" : "Answer", "text" : "Positive displacement pumps work by trapping a fixed volume of fluid inside a chamber — using a piston, diaphragm, gear, screw, or lobe — and then forcing it out through the discharge on every stroke or rotation. The volume displaced remains constant regardless of system pressure changes. Reciprocating pumps (piston, plunger, diaphragm) use back-and-forth motion. Rotary pumps (gear, screw, lobe) use rotating elements. In both cases, gaskets and seals maintain system integrity and prevent backflow." }, "name" : "How do positive displacement pumps work?" }, { "@type" : "Question", "acceptedAnswer" : { "@type" : "Answer", "text" : "Positive displacement pumps fall into two categories. Reciprocating: piston pumps (including injection pumps for chemical dosing and fuel delivery), plunger pumps (triplex and duplex configurations common in oilfield drilling), diaphragm pumps (AODD, electric, hydraulic — for corrosive or hazardous fluids), and mud pumps (heavy-duty triplex or duplex plunger pumps for drilling fluid circulation). Rotary: gear pumps (for oils, lubricants, and high-viscosity fluids), screw pumps (for medium-to-high viscosity with low pulsation), and lobe pumps (for sanitary applications in food processing and pharma)." }, "name" : "What types of positive displacement pumps are there?" }, { "@type" : "Question", "acceptedAnswer" : { "@type" : "Answer", "text" : "Use a positive displacement pump when: the fluid is highly viscous — centrifugal pumps lose efficiency quickly with thick fluids; consistent flow is required regardless of pressure changes; discharge pressure is high; or the application requires precise metering or dosing. Centrifugal pumps are better suited for high-volume, low-viscosity, lower-pressure applications like water transfer and general fluid circulation." }, "name" : "When should you use a positive displacement pump instead of a centrifugal pump?" }, { "@type" : "Question", "acceptedAnswer" : { "@type" : "Answer", "text" : "The four main advantages are: (1) Precise flow control — constant, accurate flow regardless of pressure variations; (2) High efficiency with viscous fluids — unlike centrifugals, PD pumps handle thick oils, slurries, and chemicals without losing performance; (3) High pressure capability — able to sustain high discharge pressures required in oil and gas, chemical processing, and well service; (4) Versatility — capable of handling a wide range of fluids from thin solvents to abrasive slurries and hazardous chemicals." }, "name" : "What are the key advantages of positive displacement pumps?" }, { "@type" : "Question", "acceptedAnswer" : { "@type" : "Answer", "text" : "No — and this is a critical safety requirement. Unlike a centrifugal pump, a positive displacement pump will continue building pressure even with the discharge valve closed. Without a properly sized pressure relief valve on the discharge side, this deadhead condition will cause catastrophic failure of piping, seals, or the pump itself. Always install and maintain a relief valve when operating any positive displacement pump." }, "name" : "Can a positive displacement pump run against a closed valve?" }, { "@type" : "Question", "acceptedAnswer" : { "@type" : "Answer", "text" : "Positive displacement pumps actually perform better with higher-viscosity fluids, unlike centrifugal pumps. Higher viscosity reduces internal slip between pump components, improving volumetric efficiency. However, thicker fluids require more motor horsepower to achieve the required flow rate, create higher pressure drop through suction lines, and increase the risk of cavitation if suction conditions are inadequate. Always size the system — including suction line diameter and motor horsepower — based on the fluid's viscosity across its full operating temperature range." }, "name" : "How does viscosity affect a positive displacement pump?" }, { "@type" : "Question", "acceptedAnswer" : { "@type" : "Answer", "text" : "Positive displacement pumps are used across oil and gas drilling (mud pumps, water injection, chemical dosing), chemical processing (aggressive, toxic, or high-viscosity fluid transfer), food and beverage (syrups, oils, sauces), pharmaceuticals (precise flow of active ingredients), and water treatment (chemical dosing, filtration support). In the oilfield and Gulf Coast industries, they're critical for mud pumping, well servicing, cement pumping, frac operations, pipeline pigging, and pressure testing. EV Pump services all major PD pump brands — call 337-252-6487." }, "name" : "What industries use positive displacement pumps?" }, { "@type" : "Question", "acceptedAnswer" : { "@type" : "Answer", "text" : "Four factors drive pump selection: (1) Fluid viscosity — higher viscosity fluids require more robust designs like gear or plunger pumps with larger clearances; (2) Pressure requirements — plunger pumps handle sustained high pressure better than most other types; (3) Flow rate — match pump output to system demand, accounting for viscosity effects on volumetric efficiency; (4) Material compatibility — wetted parts must be chemically compatible with the fluid to prevent corrosion, swelling, or contamination. When in doubt, consult with a pump specialist before specifying." }, "name" : "What should you consider when selecting a positive displacement pump?" }, { "@type" : "Question", "acceptedAnswer" : { "@type" : "Answer", "text" : "Routine maintenance: regularly inspect and replace seals and wear parts, verify proper lubrication per manufacturer specs, and monitor fluid quality. Common issues to watch for include seal leaks, reduced flow or pressure (often caused by worn valves or internal bypass), and abnormal vibration or noise. To extend pump life: keep suction conditions clean and properly sized, replace worn components before failure, and never run a PD pump against a closed discharge valve without a relief valve in place." }, "name" : "What are the most important maintenance and troubleshooting tips for positive displacement pumps?" }, { "@type" : "Question", "acceptedAnswer" : { "@type" : "Answer", "text" : "The next generation of positive displacement pumps will focus on smart monitoring, energy efficiency, and automation integration. IoT-enabled sensors allow real-time tracking of pressure, flow, temperature, and wear — reducing unplanned downtime and optimizing maintenance schedules. As industries like oil and gas, water treatment, and food processing face pressure to reduce energy consumption, pump manufacturers are developing designs that maintain durability while lowering power draw across varying operating conditions." }, "name" : "What does the future of positive displacement pumps look like?" } ] } ```