--- title: Everything you need to know about diaphragm pumps description: Let’s learn about the features and pluses of diaphragm pumps dedicated to agricultural use, how to choose and how to maintain them. image: https://blog.comet-spa.com/hubfs/BPS300_M-M.jpg --- - [EN](https://blog.comet-spa.com/cleaning-en) - [IT](https://blog.comet-spa.com/cleaning-it) - [B2B](http://webup.comet.re.it/) - [Job and Careers](https://joinus.emakgroup.net/areapubblica/Registrati.aspx) [YouTube](http://www.youtube.com/channel/UCef353b7MfpEv6dCix0o2lw)[Facebook](https://www.facebook.com/Cometgroupspa)[LinkedIn](https://www.linkedin.com/company/comet-s-p-a-) [![logo](https://blog.comet-spa.com/hs-fs/hubfs/Loghi/logo.png?width=248&name=logo.png)](https://comet-cleaning.com/en) - [BLOG](https://blog.comet-spa.com/cleaning-en) - [PRESSURE WASHER](https://comet-cleaning.com/en/pressure-washers) - [FLOOR CARE](https://comet-cleaning.com/en/floorcare) - [CONTACT](https://comet-cleaning.com/en/contact) Search for: # EVERYTHING YOU NEED TO KNOW ABOUT DIAPHRAGM PUMPS By [Comet](https://blog.comet-spa.com/diaphragm-pumps/author/comet) | April 17th, 2023 | Categories: Diaphragm Pumps | [4 Comments](https://blog.comet-spa.com/diaphragm-pumps/everything-you-need-to-know-about-diaphragm-pumps#comments-listing) [![EVERYTHING YOU NEED TO KNOW ABOUT DIAPHRAGM PUMPS](https://blog.comet-spa.com/hubfs/BPS300_M-M.jpg)](https://blog.comet-spa.com/diaphragm-pumps/everything-you-need-to-know-about-diaphragm-pumps) Diaphragm pumps, in agriculture, are essential tools for different stages of cultivation, used in every **spray** boom system or **sprayers**. In this article, therefore, we will find out about the features, operation, benefits, how to maintain and fix malfunctions of **diaphragm pumps**, so that you can choose the most suitable one for your farming operation. ![66_-_Copie](https://blog.comet-spa.com/hs-fs/hubfs/Blog_POMPE_PUMPS/trattamento_frutteti/66_-_Copie.jpg?width=745&height=497&name=66_-_Copie.jpg) ### **WHAT A DIAPHRAGM PUMP LOOKS LIKE** The diaphragm pumps are ideal for **spraying and weeding** treatments of agricultural crops such as cereals, vegetables, orchards, vineyards and olive groves. In fact, among the main benefits of their use in agriculture are excellent **priming and self-priming**, good **dry-running** and **mechanical-chemical resistance** to chemicals. The main feature that distinguishes the diaphragm pump from other types of volumetric reciprocating pumps is that it has an elastic separating element between the mechanical components and the processed liquid circuit, keeping the **pumping chamber and transmission separate**, thus preventing the fluid from coming into contact with the mechanical components and the oil, causing serious damage to the pump. ## **[![Scarica la Guida Funzionamento e componenti di una Pompe a Membrana](https://no-cache.hubspot.com/cta/default/5415755/0f884a08-06fd-4258-8c6e-9e76492e293f.png)](https://cta-redirect.hubspot.com/cta/redirect/5415755/0f884a08-06fd-4258-8c6e-9e76492e293f)** Let’s use a “home-made” example to help us: we can compare the diaphragm pump to an injection syringe. In an agricultural pump, therefore, the diaphragm consists of **a rubber disk screwed onto the piston**. Exactly as in the syringe, during the **suction phase**, the pump sucks in a liquid due to the vacuum created inside the pumping chamber, compensates for the pressure imbalance by means of the principle of communicating vessels and sucks the liquid back to the lower pressure space. In the subsequent **delivery phase**, on the other hand, the pressure increase inside the pumping chamber pushes the liquid outwards. The two phases together make up a **complete pumping cycle**. Expansion and contraction are generated by means of the alternating oscillations of an **elastic element**, called the diaphragm. Since the chamber has a defined and invariable maximum volume, the volume pumped in each cycle is constant, regardless of pressure. For this reason, positive displacement pumps are called **volumetric or constant flow pumps**. ### LEARN MORE: [THE COMPONENTS OF THE DIAPHRAGM PUMPS](https://blog.comet-spa.com/diaphragm-pumps/components) ![diaphragm pump_ advantages](https://blog.comet-spa.com/hs-fs/hubfs/Blog_POMPE_PUMPS/diaphragm%20pump_%20advantages.jpg?width=745&height=532&name=diaphragm%20pump_%20advantages.jpg) ### **PERFORMANCE OF A DIAPHRAGM PUMP** Whatever the liquid to be pumped and whatever the use of this liquid, the purpose for which a diaphragm pump is employed is to **lift a liquid** from a lower to a higher point. There are several parameters, however, that make up the difference in performance between one pump and another, and for use in agriculture - e.g., for sprayers - particular attention should be paid to **pump pressure and flow rate**, two factors that relate to **power**. Once established the pressure and flow rate we need, we can track the power needed to drive our pump. We are talking about **performance parameters** closely related to physics concepts as varied as they are numerous, namely: - Flow rate - Head - Pressure - Power - Speed - Pressure drop - Output - Positive net suction head Each pump, therefore, has several of the listed parameters, each of which is indicated on the appropriate data sheets of the individual pump models available on the market. ### LEARN MORE: [THE MAIN PARAMETERS DEFINING THE PERFORMANCE OF A PUMP](https://blog.comet-spa.com/diaphragm-pumps/the-basic-parameters-that-define-the-performance-of-a-pump) ## ![1](https://blog.comet-spa.com/hs-fs/hubfs/Blog_POMPE_PUMPS/1.jpg?width=745&height=418&name=1.jpg) ### **HOW TO CHOOSE A DIAPHRAGM PUMP FOR THE SPRAYER** In order to properly choose a diaphragm pump, especially for a sprayer, the parameters listed above should be well taken into account, in addition to the **type of treatment** to be carried out. For example, the **pressure** of a sprayer ranges from 30 to 40 bar, so pumps resistant to these pressures should be chosen. Spraying **pesticides for vineyards, olive groves, or orchards**, on the other hand, involves high **mechanical abrasiveness** because of the crystals that make up, e.g., copper sulfate: similarly, therefore, pumps made of brass or anodized aluminum should be chosen. Finally, for **heavy-duty pumps**, such as those for rear turbines, you should opt for pumps with high **power and sturdiness**. ### LEARN MORE: [HOW TO CHOOSE THE RIGHT DIAPHRAGM PUMP FOR YOUR SPRAYER](https://blog.comet-spa.com/diaphragm-pumps/how-to-choose-a-diaphragm-pump-for-a-boom-spraying-system) ![Foto Kit OK](https://blog.comet-spa.com/hs-fs/hubfs/kit%20manutenzione/Foto%20Kit%20OK.jpg?width=745&height=368&name=Foto%20Kit%20OK.jpg) ### **MAINTAINANCE OF A DIAPHRAGM PUMP** Proper maintenance of a diaphragm pump can help you extend the life of your sprayer or spray boom system. In fact, with each use, it is a good idea to **inspect the pump** before startup, thus checking the hydraulic system for signs of wear and clogging to avoid failure or low performance. ### [DISCOVER COMET’S RANGE OF DIAPHRAGM PUMPS FOR AGRICULTURE](https://www.comet-spa.com/agricultural/) Routine maintenance tasks, to be carried out after 300 hours of operation or at the end of the season, include **draining and flushing** the pump and **installing a new set of diaphragms**. The **oil change** is equally important, since perfect lubrication helps the operation of the individual components of the pump and increases its overall performance. For this reason, it is essential to always keep an eye on the oil level and check its condition. A general recommendation is to rely on **genuine spare parts** and have special kits available consisting of **diaphragms, valves and gaskets**. ### LEARN MORE: [MAINTENANCE OF A DIAPHRAGM PUMP, THE RIGHT OIL EXTENDS ITS LIFE](https://blog.comet-spa.com/diaphragm-pumps/maintainance-diaphragm-pump-right-oil-extends-life) [![Scarica la Guida Funzionamento e componenti di una Pompe a Membrana](https://no-cache.hubspot.com/cta/default/5415755/0f884a08-06fd-4258-8c6e-9e76492e293f.png)](https://cta-redirect.hubspot.com/cta/redirect/5415755/0f884a08-06fd-4258-8c6e-9e76492e293f) ### **TROUBLESHOOTING A DIAPHRAGM PUMP** Often, unfortunately, proper maintenance is not enough to prevent a diaphragm pump from experiencing problems, such as **failure** to **load water** or **lack of pressure**. To avoid having to stop your work because of a sudden failure and to prevent unexpected malfunction, you need to recognize the signals your pump may give you, such as unusual **noises or vibrations**. To help you, we have summarized in a special article the **most common problems** that can occur during normal use of a diaphragm pump and the **actions needed to solve them**. ### LEARN MORE: [TROUBLESHOOTING A DIAPHRAGM PUMP](https://blog.comet-spa.com/diaphragm-pumps/diaphragm-pump-troubleshooting-and-how-to-fix-the-most-common-problems)     #### Share This Post! [mailto:?body=https://blog.comet-spa.com/diaphragm-pumps/everything-you-need-to-know-about-diaphragm-pumps](mailto:?body=https://blog.comet-spa.com/diaphragm-pumps/everything-you-need-to-know-about-diaphragm-pumps) ### Related Products [![PUMPS FOR IN-FURROW FERTILIZATION](https://blog.comet-spa.com/hs-fs/hubfs/In-furrow%20fertilization%203.png?width=720&name=In-furrow%20fertilization%203.png)](https://blog.comet-spa.com/diaphragm-pumps/pumps-for-in-furrow-fertilization) #### [PUMPS FOR IN-FURROW FERTILIZATION](https://blog.comet-spa.com/diaphragm-pumps/pumps-for-in-furrow-fertilization) June 11th, 2026| [4 Comments](https://blog.comet-spa.com/diaphragm-pumps/pumps-for-in-furrow-fertilization#comments-listing) In-furrow fertilization and spray inoculation allow nutrients and inoculants to be applied directly into the seed furrow, close to the seed itself, making [![COMET AT AGRITECHNICA 2025](https://blog.comet-spa.com/hs-fs/hubfs/aGRITECHNICA%202025.jpg?width=720&name=aGRITECHNICA%202025.jpg)](https://blog.comet-spa.com/diaphragm-pumps/comet-at-agritechnica-2025) #### [COMET AT AGRITECHNICA 2025](https://blog.comet-spa.com/diaphragm-pumps/comet-at-agritechnica-2025) October 13th, 2025| [4 Comments](https://blog.comet-spa.com/diaphragm-pumps/comet-at-agritechnica-2025#comments-listing) Comet could not miss the biennial appointment with Agritechnica, the world's most important trade fair in the agricultural sector dedicated to machinery [![DIAPHRAGM PUMP MAINTENANCE IN WINTER](https://blog.comet-spa.com/hs-fs/hubfs/4.jpg?width=720&name=4.jpg)](https://blog.comet-spa.com/diaphragm-pumps/diaphragm-pump-maintenance-in-winter) #### [DIAPHRAGM PUMP MAINTENANCE IN WINTER](https://blog.comet-spa.com/diaphragm-pumps/diaphragm-pump-maintenance-in-winter) January 16th, 2025| [4 Comments](https://blog.comet-spa.com/diaphragm-pumps/diaphragm-pump-maintenance-in-winter#comments-listing) The diaphragm pumps are basic tools in agriculture, and by following their cycles, they observe a rest period in winter. However, it is important to know [![Download Diaphragm Pump Guide](https://no-cache.hubspot.com/cta/default/5415755/bdbcd232-da30-422a-907f-822ca04d132b.png)](https://cta-redirect.hubspot.com/cta/redirect/5415755/bdbcd232-da30-422a-907f-822ca04d132b) ### Subscribe to our Blog ### Find us on Facebook > [Comet Spa](https://www.facebook.com/Cometgroupspa) - [Popular](https://blog.comet-spa.com/diaphragm-pumps/everything-you-need-to-know-about-diaphragm-pumps#tab-0) - [Recent](https://blog.comet-spa.com/diaphragm-pumps/everything-you-need-to-know-about-diaphragm-pumps#tab-1) - [![DIAPHRAGM PUMP TROUBLESHOOTING: HOW TO FIX MOST COMMON PROBLEMS](https://blog.comet-spa.com/hs-fs/hubfs/cause%20e%20rimedi%20OK-1.jpg?width=720&name=cause%20e%20rimedi%20OK-1.jpg)](https://blog.comet-spa.com/diaphragm-pumps/diaphragm-pump-troubleshooting-and-how-to-fix-the-most-common-problems) [DIAPHRAGM PUMP TROUBLESHOOTING: HOW TO FIX MOST COMMON PROBLEMS](https://blog.comet-spa.com/diaphragm-pumps/diaphragm-pump-troubleshooting-and-how-to-fix-the-most-common-problems) September 14th, 2022 - [![COMPONENTS OF A DIAPHRAGM PUMP](https://blog.comet-spa.com/hs-fs/hubfs/Diaphragm%20pump%20components%20con%20sfondo.jpg?width=720&name=Diaphragm%20pump%20components%20con%20sfondo.jpg)](https://blog.comet-spa.com/diaphragm-pumps/components) [COMPONENTS OF A DIAPHRAGM PUMP](https://blog.comet-spa.com/diaphragm-pumps/components) August 27th, 2023 - [![THE CIRCUIT OF A SPRAYING MACHINE: HOW A SPRAYING AND WEED CONTROL PUMP WORKS](https://blog.comet-spa.com/hs-fs/hubfs/u.png?width=720&name=u.png)](https://blog.comet-spa.com/diaphragm-pumps/the-circuit-of-a-spraying-machine-spraying-and-weed-control-pumps) [THE CIRCUIT OF A SPRAYING MACHINE: HOW A SPRAYING AND WEED CONTROL PUMP WORKS](https://blog.comet-spa.com/diaphragm-pumps/the-circuit-of-a-spraying-machine-spraying-and-weed-control-pumps) July 2nd, 2019 - [![PUMPS FOR IN-FURROW FERTILIZATION](https://blog.comet-spa.com/hs-fs/hubfs/In-furrow%20fertilization%203.png?width=720&name=In-furrow%20fertilization%203.png)](https://blog.comet-spa.com/diaphragm-pumps/pumps-for-in-furrow-fertilization) [PUMPS FOR IN-FURROW FERTILIZATION](https://blog.comet-spa.com/diaphragm-pumps/pumps-for-in-furrow-fertilization) April 11th, 2026 - [![COMET AT AGRITECHNICA 2025](https://blog.comet-spa.com/hs-fs/hubfs/aGRITECHNICA%202025.jpg?width=720&name=aGRITECHNICA%202025.jpg)](https://blog.comet-spa.com/diaphragm-pumps/comet-at-agritechnica-2025) [COMET AT AGRITECHNICA 2025](https://blog.comet-spa.com/diaphragm-pumps/comet-at-agritechnica-2025) April 13th, 2025 - [![COMET’S TECHNOLOGICAL INNOVATIONS AND MARKET TRENDS OF DIAPHRAGM PUMPS: INTERVIEW WITH EXPORT MANAGER LUCA GUIDETTI](https://blog.comet-spa.com/hs-fs/hubfs/image009.png?width=720&name=image009.png)](https://blog.comet-spa.com/diaphragm-pumps/comet-technological-innovations-and-market-trends-of-diaphragm-pumps-interview-with-export-manager-luca-guidetti) [COMET’S TECHNOLOGICAL INNOVATIONS AND MARKET TRENDS OF DIAPHRAGM PUMPS: INTERVIEW WITH EXPORT MANAGER LUCA GUIDETTI](https://blog.comet-spa.com/diaphragm-pumps/comet-technological-innovations-and-market-trends-of-diaphragm-pumps-interview-with-export-manager-luca-guidetti) April 11th, 2025 ### Categories - [Diaphragm Pumps (29)](https://blog.comet-spa.com/diaphragm-pumps/tag/diaphragm-pumps) - [Agricultural Pumps (16)](https://blog.comet-spa.com/diaphragm-pumps/tag/agricultural-pumps) - [Diaphragm Pump Problems (4)](https://blog.comet-spa.com/diaphragm-pumps/tag/diaphragm-pump-problems) - [High Pressure Diaphragm Pumps (4)](https://blog.comet-spa.com/diaphragm-pumps/tag/high-pressure-diaphragm-pumps) - [spraying pump (4)](https://blog.comet-spa.com/diaphragm-pumps/tag/spraying-pump) ### Archives - [July 2019 (3)](https://blog.comet-spa.com/diaphragm-pumps/archive/2019/07) - [January 2025 (3)](https://blog.comet-spa.com/diaphragm-pumps/archive/2025/01) - [September 2022 (2)](https://blog.comet-spa.com/diaphragm-pumps/archive/2022/09) - [August 2023 (2)](https://blog.comet-spa.com/diaphragm-pumps/archive/2023/08) - [October 2023 (2)](https://blog.comet-spa.com/diaphragm-pumps/archive/2023/10) [![Contact us to find your closer dealer](https://no-cache.hubspot.com/cta/default/5415755/bd664e4f-96d4-4626-b729-1182a86e47a5.png)](https://cta-redirect.hubspot.com/cta/redirect/5415755/bd664e4f-96d4-4626-b729-1182a86e47a5) © 2019   |   Comet Spa | Via G.Dorso, 4 - 42124 Reggio Emilia (Italy) - Ph:+39.0522.386.111 - Società soggetta al controllo e coordinamento di EMAK S.p.A. R.E.A. di RE n.181918 - Reg.Imprese di RE n.19133 - N. Mecc. RE004460 - Cap.Soc. Euro 2.600.000,00 - Codice Fiscale e Partita IVA IT01392660351 - [Legal notes](https://www.comet-spa.com/company/legal/) | [Privacy](https://www.comet-spa.com/company/legal/#tab-b985c16358b8a103d6f) and [cookies](https://www.comet-spa.com/company/legal/#tab-30a19e6907541b7dbe6) | All rights reserved [YouTube](http://www.youtube.com/channel/UCef353b7MfpEv6dCix0o2lw)[Facebook](https://www.facebook.com/Cometgroupspa)[LinkedIn](https://www.linkedin.com/company/comet-s-p-a-)