{"id":4610,"date":"2026-04-21T03:32:33","date_gmt":"2026-04-21T03:32:33","guid":{"rendered":"https:\/\/hydrathpower.com\/?p=4610"},"modified":"2026-04-21T03:32:33","modified_gmt":"2026-04-21T03:32:33","slug":"guide-de-selection-des-verins-hydrauliques-dimensionnement-et-selection-etape-par-etape","status":"publish","type":"post","link":"https:\/\/hydrathpower.com\/fr\/hydraulic-cylinder-selection-guide-step-by-step-sizing-and-selection\/","title":{"rendered":"Guide de s\u00e9lection des v\u00e9rins hydrauliques : Dimensionnement et s\u00e9lection \u00e9tape par \u00e9tape"},"content":{"rendered":"<h2>Introduction: Why Hydraulic Cylinder Selection Matters<\/h2>\n<p>Hydraulic <a href=\"\/hydraulic-cylinders\/\">cylinders<\/a> are critical actuators in hydraulic systems. Their accurate selection directly affects equipment matching and performance. In different industrial scenarios and working conditions, from precision machine tool processing to heavy-duty construction equipment operations, the requirements for hydraulic cylinders vary significantly.<\/p>\n<p>Improper selection can lead to low equipment operating efficiency, frequent failures, and even safety hazards. Therefore, a scientific and systematic selection method is essential. This guide will analyze the key elements and steps for hydraulic cylinder selection, providing you with a comprehensive and practical selection guide.<\/p>\n<h2>Step 1: Determine System Pressure P<\/h2>\n<p>Pressure selection depends on load size (F) and equipment type. You must also consider limitations such as actuator installation space, economic conditions, and component availability.<\/p>\n<p>When load is fixed, low working pressure requires larger actuator structural dimensions. For some equipment, dimensions are restricted, and from a material consumption perspective, this is not economical. Conversely, if pressure is too high, requirements for pump, cylinder, valve materials, sealing, and manufacturing precision also increase, inevitably raising equipment costs.<\/p>\n<h3>General guidelines:<\/h3>\n<ul>\n<li>Fixed equipment with fewer size restrictions: select lower pressure<\/li>\n<li><a href=\"\/mobile-hydraulic-power-unit\/\">Mobile<\/a> machinery prioritizing compactness: select higher pressure<\/li>\n<\/ul>\n<h3>Pressure Selection by Load:<\/h3>\n<table>\n<tbody>\n<tr>\n<th>Load (kN)<\/th>\n<th>Design Pressure (MPa)<\/th>\n<\/tr>\n<tr>\n<td>&lt; 5<\/td>\n<td>0.8-1.2<\/td>\n<\/tr>\n<tr>\n<td>5-20<\/td>\n<td>1.5-2.5<\/td>\n<\/tr>\n<tr>\n<td>20-50<\/td>\n<td>2.5-3.5<\/td>\n<\/tr>\n<tr>\n<td>50-100<\/td>\n<td>3.5-5<\/td>\n<\/tr>\n<tr>\n<td>&gt; 100<\/td>\n<td>&gt; 5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Design Pressure by Equipment Type:<\/h3>\n<table>\n<tbody>\n<tr>\n<th>Equipment Type<\/th>\n<th>Design Pressure (MPa)<\/th>\n<\/tr>\n<tr>\n<td>Agricultural machinery<\/td>\n<td>10-16<\/td>\n<\/tr>\n<tr>\n<td>Machine tool<\/td>\n<td>2.5-4<\/td>\n<\/tr>\n<tr>\n<td>Plastic injection molding machine<\/td>\n<td>14-18<\/td>\n<\/tr>\n<tr>\n<td>Mining machinery<\/td>\n<td>21-32<\/td>\n<\/tr>\n<tr>\n<td>Construction machinery<\/td>\n<td>16-21<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Step 2: Select Bore Diameter D and Rod Diameter d<\/h2>\n<p>After selecting design pressure (P is known) and knowing load size (F), calculate the force-bearing area using formulas. Then calculate the cylinder bore diameter based on the force-bearing area.<\/p>\n<h3>Force Formulas:<\/h3>\n<ul>\n<li><strong>Thrust (Push):<\/strong> F1 = A1 \u00d7 P1 \u00d7 \u03b2<\/li>\n<li><strong>Pull Force:<\/strong> F2 = A2 \u00d7 P2 \u00d7 \u03b2<\/li>\n<\/ul>\n<h3>Area Calculations:<\/h3>\n<ul>\n<li><strong>A1:<\/strong> Thrust-side piston pressure area (cm\u00b2), A1 = \u03c0\/4 \u00d7 D\u00b2 = 0.785 \u00d7 D\u00b2<\/li>\n<li><strong>A2:<\/strong> Pull-side piston pressure area (cm\u00b2), A2 = \u03c0\/4 \u00d7 (D\u00b2 &#8211; d\u00b2) = 0.785 \u00d7 (D\u00b2 &#8211; d\u00b2)<\/li>\n<\/ul>\n<h3>Where:<\/h3>\n<ul>\n<li>D: Cylinder inner diameter \/ piston diameter (cm)<\/li>\n<li>d: Piston rod diameter (cm)<\/li>\n<li>P1: Thrust-side operating pressure (kgf\/cm\u00b2)<\/li>\n<li>P2: Pull-side operating pressure (kgf\/cm\u00b2)<\/li>\n<li>\u03b2: Load rate<\/li>\n<\/ul>\n<h3>Important Notes:<\/h3>\n<ol>\n<li>Actual cylinder output is lower than theoretical output<\/li>\n<li>Load rate \u03b2 value: 80% for low inertia applications, 60% for high inertia applications<\/li>\n<\/ol>\n<h3>Calculation Example<\/h3>\n<p><strong>Given:<\/strong> Cylinder output force is 1000 kg, operating pressure is 70 kgf\/cm\u00b2<\/p>\n<p><strong>Solution:<\/strong><\/p>\n<ul>\n<li>Force F = 1000 kg<\/li>\n<li>Operating pressure P = 70 kgf\/cm\u00b2<\/li>\n<li>Load rate \u03b2 = 0.8<\/li>\n<\/ul>\n<p><strong>Step 1: Calculate pressure area<\/strong><br \/>\nA1 = F1 \/ (P1 \u00d7 \u03b2) = 1000 \/ (70 \u00d7 0.8) = 17.86 cm\u00b2<\/p>\n<p><strong>Step 2: Calculate bore diameter<\/strong><br \/>\nA1 = \u03c0\/4 \u00d7 D\u00b2 = 0.785 \u00d7 D\u00b2<br \/>\nD\u00b2 = 17.86 \/ 0.785 = 22.75 cm\u00b2<br \/>\nD = \u221a22.75 = 4.8 cm = 48 mm<\/p>\n<p><strong>Result:<\/strong> Bore inner diameter should be 50 mm<\/p>\n<h3>Rod Diameter Selection<\/h3>\n<table>\n<tbody>\n<tr>\n<th>System Pressure<\/th>\n<th>Rod Diameter Ratio<\/th>\n<\/tr>\n<tr>\n<td>P \u2264 10 MPa<\/td>\n<td>d = 0.5D<\/td>\n<\/tr>\n<tr>\n<td>P = 12.5 to 20 MPa<\/td>\n<td>d = 0.56D<\/td>\n<\/tr>\n<tr>\n<td>P &gt; 20 MPa<\/td>\n<td>d = 0.71D<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The higher the pressure, the larger the required rod diameter ratio to ensure strength and stability.<\/p>\n<h2>Step 3: Select Stroke S<\/h2>\n<p>Based on the requirements of the equipment or device system overall design, determine the installation method and stroke S.<\/p>\n<p><strong>Stroke Formula:<\/strong><br \/>\nS = Actual maximum working stroke (Smax) + Stroke margin (\u0394S)<\/p>\n<p><strong>Where:<\/strong> \u0394S = \u0394S1 + \u0394S2 + \u0394S3<\/p>\n<h3>Stroke margin determination principles:<\/h3>\n<ul>\n<li><strong>\u0394S1:<\/strong> Manufacturing tolerance margin for system structural installation dimensions<\/li>\n<li><strong>\u0394S2:<\/strong> Working stroke margin needed at cylinder stroke starting position<\/li>\n<li><strong>\u0394S3:<\/strong> Working stroke margin needed at cylinder stroke ending position<\/li>\n<\/ul>\n<p><strong>Important:<\/strong> When hydraulic cylinders have buffer function requirements, the stroke margin size directly affects buffer performance. It is recommended to minimize stroke margin \u0394S as much as possible.<\/p>\n<p><strong>Long stroke considerations:<\/strong> For cylinders exceeding the maximum allowed stroke in product catalogs, perform stability verification based on specific working conditions (load characteristics, installation method, etc.)<\/p>\n<h2>Step 4: Select Mounting Method<\/h2>\n<p>The cylinder mounting method refers to how the cylinder connects to the equipment. After determining the mounting method, confirm the mounting dimensions.<\/p>\n<h3>Mounting Method Comparison Table<\/h3>\n<table>\n<tbody>\n<tr>\n<th>Mounting Type<\/th>\n<th>Application<\/th>\n<th>Characteristics<\/th>\n<\/tr>\n<tr>\n<td>Flange Mount<\/td>\n<td>Fixed installation, force on center axis<\/td>\n<td>Front\/rear\/tail flange options<\/td>\n<\/tr>\n<tr>\n<td>Trunnion Mount<\/td>\n<td>Curved motion paths, angular operations<\/td>\n<td>Clevis, pin mount options<\/td>\n<\/tr>\n<tr>\n<td>Foot Mount<\/td>\n<td>Fixed installation, off-center force application<\/td>\n<td>Front\/rear\/side foot options<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Flange Mounting<\/h3>\n<p>Suitable for fixed installations where the acting force and support center are on the same axis. Mounting position options: front end, middle, or rear.<\/p>\n<ul>\n<li><strong>Compression (push) applications:<\/strong> Use rear or middle flange mounting<\/li>\n<li><strong>Tension (pull) applications:<\/strong> Use front or middle flange mounting<\/li>\n<\/ul>\n<h3>Trunnion Mounting<\/h3>\n<p>Suitable for applications where the acting force causes the moving machine component to follow a curved path in the same motion plane.<\/p>\n<p><strong>Tail clevis mounting (most common):<\/strong><\/p>\n<ul>\n<li><strong>Single clevis:<\/strong> For movements within \u00b13\u00b0 in one motion plane<\/li>\n<li><strong>Double clevis:<\/strong> For any angle in one motion plane; consider piston rod buckling for long-stroke push force<\/li>\n<\/ul>\n<p><strong>Pin mount (front\/middle\/rear):<\/strong><\/p>\n<ul>\n<li><strong>Middle pin mount:<\/strong> Most common, allows balance at any position between ends<\/li>\n<li><strong>Rear pin mount:<\/strong> Similar to double clevis selection method<\/li>\n<li><strong>Front pin mount:<\/strong> Suitable for smaller rod diameter cylinders; limit stroke to 5 times bore diameter<\/li>\n<\/ul>\n<h3>Foot Mounting<\/h3>\n<p>Suitable for fixed installations where the mounting plane is not on the same plane as the cylinder center axis. Must ensure proper positioning, fastening of the installed component, and appropriate load guidance to prevent excessive side load on the piston rod.<\/p>\n<h2>Step 5: Select End Position Buffer<\/h2>\n<p><strong>Select dual-end cushioning or single-end cushioning under these conditions:<\/strong><\/p>\n<ol>\n<li>When cylinder piston runs full stroke with return speed &gt; 100 mm\/s: select dual-end cushioning<\/li>\n<li>When single-direction or return speed &gt; 100 mm\/s approaching stroke end: select single-end or dual-end cushioning<\/li>\n<li>Other specific working conditions<\/li>\n<\/ol>\n<h2>Step 6: Select Port Type and Diameter<\/h2>\n<p><strong>Port types:<\/strong> Internal thread, flange, and other special types &#8211; determined by the connection method of system piping.<\/p>\n<p><strong>Port diameter selection principle:<\/strong> When medium flow rate in the connection pipeline between system and cylinder is known, medium flow velocity through the port should generally not exceed 5 m\/s.<\/p>\n<h2>Step 7: Cylinder with Integrated Valves<\/h2>\n<p><strong>Pressure maintenance:<\/strong> Slide valves have clearance leakage and can only maintain pressure for short periods. For pressure maintenance requirements, add a pilot-to-check valve to the circuit.<\/p>\n<p><strong>Cylinder &#8220;support&#8221;:<\/strong> In vertical hydraulic cylinders, connect pilot-to-check valve to the lower chamber circuit to prevent sliding.<\/p>\n<p><strong>Cylinder locking:<\/strong> When the direction valve is in neutral position, two pilot-to-check valves close tightly, sealing both cylinder chambers.<\/p>\n<h2>Step 8: Special Working Condition Selection<\/h2>\n<h3>Working medium:<\/h3>\n<ul>\n<li>Normal medium is mineral oil<\/li>\n<li>Recommended: 32# and 46# anti-wear hydraulic oil<\/li>\n<li>Optimal oil temperature: 20-55\u00b0C<\/li>\n<li>Do not operate below 15\u00b0C or above 70\u00b0C<\/li>\n<li>Replace hydraulic oil every 1-6 months and clean the oil tank<\/li>\n<\/ul>\n<h3>Environment\/medium temperature:<\/h3>\n<ul>\n<li>Normal working medium temperature: -20\u00b0C to +80\u00b0C<\/li>\n<li>Beyond this range, note effects on sealing, materials, and cooling systems<\/li>\n<\/ul>\n<h3>High operational accuracy:<\/h3>\n<p>For servo or medium-high pressure systems with low start pressure requirements, note effects on sealing, materials, and detailed design.<\/p>\n<h3>Zero leakage:<\/h3>\n<p>For cylinders with specific pressure maintenance requirements, note effects on sealing and material properties.<\/p>\n<h3>High frequency vibration environment:<\/h3>\n<p>Note effects on material properties, connection structures, and detailed design.<\/p>\n<h3>Low temperature freezing or polluted environment:<\/h3>\n<p>High dust environments, water spray, acid mist, or salt spray environments &#8211; note effects on sealing, materials, piston rod surface treatment, and product protection.<\/p>\n<h2>Step 9: Seal Quality Selection<\/h2>\n<p>For special working conditions, specified quality requirements, or hydraulic cylinder seal system failures with serious consequences (affecting safety, difficult replacement, large economic losses) or special requirements for export-matched cylinders, it is recommended that professional engineers from the manufacturer recommend well-known seal brands with good interchangeability and easy procurement based on working conditions.<\/p>\n<h2>Step 10: Other Feature Selection<\/h2>\n<p><strong>Air bleed valve:<\/strong> Based on the cylinder&#8217;s working position status, normally set at the highest point where air ultimately accumulates in the end chamber of both cavities. After air is exhausted, it prevents crawling, protects seals, and slows oil degradation.<\/p>\n<p><strong>Leakage port:<\/strong> In working environments strictly prohibiting external oil leakage, due to long cylinder stroke or certain working conditions causing oil accumulation behind the dust seal during operation, a leakage port must be set at the oil accumulation position.<\/p>\n<h2>Selection Checklist Summary<\/h2>\n<p>Before finalizing your hydraulic cylinder selection, verify:<\/p>\n<ul>\n<li>[ ] System pressure determined based on load and equipment type<\/li>\n<li>[ ] Bore diameter calculated from force and pressure requirements<\/li>\n<li>[ ] Rod diameter selected based on operating pressure<\/li>\n<li>[ ] Stroke determined with adequate margin for tolerance and positioning<\/li>\n<li>[ ] Mounting method selected for your application (flange\/trunnion\/foot)<\/li>\n<li>[ ] Buffer selected if piston speed exceeds 100 mm\/s<\/li>\n<li>[ ] Port type and size appropriate for flow requirements<\/li>\n<li>[ ] Special requirements addressed (temperature, precision, leakage)<\/li>\n<li>[ ] Seal quality appropriate for criticality and maintenance accessibility<\/li>\n<\/ul>\n<h2>Frequently Asked Questions<\/h2>\n<h3>How do I calculate hydraulic cylinder bore size?<\/h3>\n<p>Use the formula A1 = F \/ (P \u00d7 \u03b2), where F is the required force, P is the operating pressure, and \u03b2 is the load rate (typically 0.8 for low inertia applications). Then calculate D from A1 = 0.785 \u00d7 D\u00b2.<\/p>\n<h3>What is the relationship between pressure and rod diameter?<\/h3>\n<p>For P \u2264 10 MPa, rod diameter d = 0.5D; for P = 12.5-20 MPa, d = 0.56D; for P &gt; 20 MPa, d = 0.71D.<\/p>\n<h3>When should I use buffer on hydraulic cylinders?<\/h3>\n<p>Select dual-end cushioning when piston speed exceeds 100 mm\/s in both directions. Select single-end cushioning when only one direction has high speed approaching stroke end.<\/p>\n<h3>What is the best mounting method for curved motion?<\/h3>\n<p>Trunnion mounting (clevis or pin mount) is best for curved motion paths. Single clevis works for movements within \u00b13\u00b0; double clevis allows any angle in one plane.<\/p>\n<h3>What hydraulic fluid is recommended for hydraulic cylinders?<\/h3>\n<p>32# or 46# anti-wear hydraulic oil is recommended. Optimal operating temperature is 20-55\u00b0C.<\/p>\n<h2>Conclusion<\/h2>\n<p>Hydraulic cylinder selection requires systematic consideration of multiple factors including pressure, bore size, rod diameter, stroke, mounting method, and special working conditions. By following the step-by-step selection process outlined in this guide, you can ensure optimal matching between the hydraulic cylinder and your equipment.<\/p>\n<p>Proper selection ensures equipment performance, reduces failures, and extends system life.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Introduction: Why Hydraulic Cylinder Selection Matters Hydraulic cylinders are critical actuators in hydraulic systems. Their accurate selection directly affects equipment [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":4611,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-4610","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Hydraulic Cylinder Selection Guide: Step-by-Step Sizing and Selection - Hydrath Power<\/title>\n<meta name=\"description\" content=\"Learn how to select the right hydraulic cylinder with this step-by-step guide. 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