[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-664128-105":59,"doc-detail-664128-en":129},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":122,"head_meta":124,"extra_data":126,"updated_unix":128},105,"en","diaphragm-pumps-operation-and-working-principles","DIAPHRAGM PUMPS - Operation and working principles","","Comet’s “Diaphragm Pumps - Operation and working principles” explains how diaphragm pumps operate as positive displacement pumps. It describes how alternating diaphragm expansion and contraction create suction and delivery strokes, forming a complete pumping cycle. The document clarifies that each cycle delivers a constant volume independent of pressure, and that flow rate depends on pump speed (RPM). It also introduces alternative pump mechanics, including the conversion from rotary crankshaft motion to oscillatory diaphragm movement, and notes pressure limits tied to component strength and engineering.",{"@graph":69,"@context":121},[70,84,104],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":30,"@type":76,"position":81},"https://docshare.wps.com/document/technology/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/diaphragm-pumps-operation-and-working-principles/664128/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":98,"encodingFormat":97,"isAccessibleForFree":99,"interactionStatistic":100},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/diaphragm-pumps-operation-and-working-principles/664128.png","ImageObject",300,407,{"name":92,"@type":93},"pop out","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-29",true,{"@type":101,"interactionType":102,"userInteractionCount":14},"InteractionCounter",{"@type":103},"ViewAction",{"@type":105,"mainEntity":106},"FAQPage",[107,113,117],{"name":108,"@type":109,"acceptedAnswer":110},"What is a diaphragm pump and how does it create pumping pressure?","Question",{"text":111,"@type":112},"A diaphragm pump is a positive displacement pump that uses contracting and expanding cavities to create pressure imbalances between the chamber and adjacent spaces. The resulting suction and delivery strokes move the fluid from higher pressure to lower pressure areas.","Answer",{"name":114,"@type":109,"acceptedAnswer":115},"Does diaphragm pump flow depend on pressure or on speed (RPM)?",{"text":116,"@type":112},"The pumped volume per cycle is constant, so pressure changes do not affect the delivered volume. Flow rate is directly proportional to pump speed (RPM), since changing RPM changes the number of cycles.",{"name":118,"@type":109,"acceptedAnswer":119},"How does the crankshaft motion translate into diaphragm movement?",{"text":120,"@type":112},"An external power source drives a rotary crankshaft, and a transmission system converts the rotary movement into an oscillatory diaphragm motion. One complete rotational cycle coincides with one suction plus one delivery cycle.","https://schema.org",{"og:url":83,"og:type":123,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":125,"canonical":83},"index,follow",{"doc_id":127,"site_id":62},664128,1793240327,{"code":4,"msg":5,"data":130},{"doc_id":127,"user_id":131,"nickname":92,"user_avatar":132,"doc_module":4,"category_id":29,"category_name":30,"doc_title":65,"doc_description":67,"doc_content":133,"file_id":134,"file_url":135,"file_type":136,"file_size":137,"view_count":14,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":138,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":128,"read_time":143},962090760408,"https://ap-avatar.wpscdn.com/davatar_085a072bc5b1113ac321206ff7593b45","Comet Guide  \nOPERATION AND WORKING PRINCIPLES  \nDIAPHRAGM PUMPS  \nSINCE  \n1959  \nmore than  \n130  \nCountries  \n+750  \nWorld employees made in  \n Italy  \nEstablished in Reggio Emilia, in the heart of the Italian pump Valley, in 1959, over a period of 60 years, Comet has managed to skilfully integrate experience and innovation. A unique combination which has made the company a major representative of the Italian manufacturing industry.  \nThe outstanding quality of our products has made Comet a premium brand known and respected in over 130 countries of the world.  \nOur group consists of people who share a single goal: to produce added value for our customers.  \nToday, Comet is world leader in the spraying and weeding sector and contributes to Italian excellence worldwide. All the pumps of the Agriculture division are proudly Made in Italy.  \nDIAPHRAGM PUMPS | Operation and working principles   \nINDEX  \n01-DEFINITION AND PRINCIPLES Page 04  \n02-COMPOSITION AND FUNCTIONING Page 09  \n03-ADVANTAGES Page 30  \n04-PRESSURE REGULATORS Page 36  \n05-PLUMBING DIAGRAM Page 38  \n06-COMET PRODUCT RANGE Page 42  \nDisclaimer: this document may not be distributed or reproduced in any form without express written permission of Comet SpA. 3  \nDIAPHRAGM PUMPS | Operation and working principles  \n01-WHAT IS A DIAPHRAGM PUMP: DEFINITION AND PRINCIPLES  \nDiaphragm pumps are positive displacement pumps which use contracting and expanding cavities to generate pressure imbalances between the pumping chamber and the adjacent spaces.  \nBy trying to compensate such imbalances, the fluid moves naturally from the area with a higher pressure to the area with a lower pressure, resulting in a pumping action.  \nDuring the expansion stroke there is a loss of pressure inside the chamber, producing suction, and the fluid enters into the chamber (this phase is known as suction or expansion) .  \nDuring the discharge stroke, there is an increase of pressure and the fluid exits from the chamber (delivery or discharge phase) .  \nIn diaphragm pumps, expansion and contraction are generated by alternative oscillation of an elastic element called, in fact, diaphragm.  \nA typical example of a diaphragm pump is the liquid soap dispenser.  \n4 Disclaimer: this document may not be distributed or reproduced in any form without express written permission of Comet SpA.  \nDIAPHRAGM PUMPS | Operation and working principles   \nThe combination of the two strokes of suction and delivery creates a complete pumping cycle.  \nGiven that the pumping chamber has a maxiumum defined and invariable volume, the pumped volume of every cycle is always costant, regardless of pressure.  \nV = k  \nFor this reason, positive displacement pumps are known as volumetric pumps or constant flow pumps. To modify the flow rate it is necessary to change the number of cycles, namely pump speed (RPM)  \nFLOW RATE (or volume) is directly proportional to SPEED.  \nOn the contrary, pressure changes do not affect the pumped volume.  \nThe performance chart of Comet pump BPS 260 confirms that the pumped volume is constant at a given speed (550 RPM) * (≈248 lt/min) regardless of pressure changes, while it varies with speed changes (RPM column) .  \n* Marginal volume reductions are due to efficiency losses typical of any mechanical equipment  \nDisclaimer: this document may not be distributed or reproduced in any form without express written permission of Comet SpA. 5  \nDIAPHRAGM PUMPS | Operation and working principles  \nThe achievable pressure of a positive displacement pump has no theoretical limits, as it is only limited by the structural resistance of its components and by its constructive engineering.  \nThanks to the oscillatory movement of the diaphragm (up and down), this kind of pump is known as an alternative pump, same as piston pumps, to distinguish them from rotational pumps, characterized by rotating elements.  \nAlternative pumps are always actuated by an external power source (electric motor, hydraulic or endoth","cbCailVVfimcGyPK","https://ap.wps.com/l/cbCailVVfimcGyPK","pdf",3172035,54,"English","# 01-DEFINITION AND PRINCIPLES\n## Diaphragm pump operating cycle\n## Suction stroke and delivery stroke\n# 02-COMPOSITION AND FUNCTIONING\n# 03-ADVANTAGES\n# 04-PRESSURE REGULATORS\n# 05-PLUMBING DIAGRAM\n# 06-COMET PRODUCT RANGE","[{\"question\":\"What is a diaphragm pump and how does it create pumping pressure?\",\"answer\":\"A diaphragm pump is a positive displacement pump that uses contracting and expanding cavities to create pressure imbalances between the chamber and adjacent spaces. The resulting suction and delivery strokes move the fluid from higher pressure to lower pressure areas.\"},{\"question\":\"Does diaphragm pump flow depend on pressure or on speed (RPM)?\",\"answer\":\"The pumped volume per cycle is constant, so pressure changes do not affect the delivered volume. Flow rate is directly proportional to pump speed (RPM), since changing RPM changes the number of cycles.\"},{\"question\":\"How does the crankshaft motion translate into diaphragm movement?\",\"answer\":\"An external power source drives a rotary crankshaft, and a transmission system converts the rotary movement into an oscillatory diaphragm motion. One complete rotational cycle coincides with one suction plus one delivery cycle.\"}]","DIAPHRAGM PUMPS - Operation and working principles | PDF",136]