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It further details directional control valves by port/position counts, electro-hydraulic servo behavior, operator control methods, and key valve families such as check, shuttle, rapid exhaust, pressure relief, proportional relief, sequence, pressure reducing, and flow control.",{"@graph":14,"@context":72},[15,34,55],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/technology/","Technology",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/document/hydraulic-schematic-symbols-standard-symbols-lines-circular-square-diamond-miscellaneous-pumps-and-compressors-motors/662912/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":49,"encodingFormat":47,"isAccessibleForFree":50,"interactionStatistic":51},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/hydraulic-schematic-symbols-standard-symbols-lines-circular-square-diamond-miscellaneous-pumps-and-compressors-motors/662912.png","ImageObject",300,407,{"name":42,"@type":43},"Mafia Boss","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-10-30","2026-10-28",true,{"@type":52,"interactionType":53,"userInteractionCount":33},"InteractionCounter",{"@type":54},"ViewAction",{"@type":56,"mainEntity":57},"FAQPage",[58,64,68],{"name":59,"@type":60,"acceptedAnswer":61},"What do continuous and dashed line styles represent in the hydraulic schematic symbols chart?","Question",{"text":62,"@type":63},"A continuous line represents a flow line. A dashed line represents pilot and drain signals.","Answer",{"name":65,"@type":60,"acceptedAnswer":66},"How are directional control valves categorized in the chart?",{"text":67,"@type":63},"Directional control valves are described by their number of ports and positions, such as 2 ports/2 positions, 3 ports/2 positions, 4 ports/2 positions, and combinations like 4 ports/3 positions.",{"name":69,"@type":60,"acceptedAnswer":70},"What is the difference between a pressure relief valve and a proportional pressure relief valve?",{"text":71,"@type":63},"A pressure relief valve limits line pressure to a set setting and directs the secondary path to the tank. A proportional pressure relief valve limits line pressure proportionally to an electronic signal.","https://schema.org",{"og:url":32,"og:type":74,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":76,"canonical":32},"index,follow",{"doc_id":78,"site_id":7},662912,1793223353,{"code":4,"msg":81,"data":82},"success",[83,87,91,95,100,104,109,114,119,122,126],{"id":22,"doc_module":4,"doc_module_name":25,"category_name":84,"show_sort_weight":85,"slug":86},"Story & 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pneumatic [air] lines with low pressures, metal piping for hydraulic [fluid] lines with high pressure)  \nLines  \n-Continuous line (for) flow line  \n-Dashed line (for) pilot, drain  \n-Envelope (for) long and short dashes around two or more component symbols.  \nCircular  \n-Large circle-pump, motor  \n-Small circle-Measuring devices  \n-Semi-circle-rotary actuator  \nSquare  \n-One square-pressure control function  \n-Two or three adjacent squares-directional control  \nDiamond  \n -Diamond-Fluid conditioner (filter, separator, lubricator, heat exchanger)  \nMiscellaneous Symbols  \n -Spring  \n -Flow Restriction  \nTriangle  \n-Solid-Direction of Hydraulic Fluid Flow  \n-Open-Direction of Pneumatic flow  \n[https://www.airlinehyd.com/pages/resources/hydraulic-schematic-symbols](https://www.airlinehyd.com/pages/resources/hydraulic-schematic-symbols)  \nPumps and Compressors  \n(turn rotary torque from an AC or DC electric motor into pressure in a hydraulic or pneumatic system)  \nFixed Displacement Hydraulic Pump Symbols  \n -Unidirectional  \n -Bidirectional  \nVariable Displacement Hydraulic Pump Symbols  \n -Unidirectional  \n -Bidirectional  \nCompressor symbol  \nMotors  \nFixed Displacement Hydraulic Motor Symbol  \n -Unidirectional  \n -Bidirectional  \nVariable Displacement Hydraulic Motor Symbol  \n-Unidirectional  \n-Bidirectional  \nPneumatic Motor Symbol  \n-Unidirectional  \n-Bidirectional  \nRotary Actuator Symbol  \n -Hydraulic  \n -Pneumatic  \nCylinders  \nSingle Acting Cylinder Symbols  \n -Returned by external force  \n -Returned by spring or extended by spring force  \nDouble Acting Cylinder Symbols  \n -Single piston rod (fluid required to extend and retract)  \n -Double ended piston rod  \nCylinders with Cushions Symbols  \n -Single fixed cushion  \n -Double fixed cushion  \n -Single adjustable cushion  \n -Double adjustable cushion  \nDirectional Control Valve Symbols  \nDirectional Control Valve (2 ports / 2 positions)  \n-Normally closed directional control valve with 2 ports and 2 finite positions.  \n-Normally open directional control valve with 2 ports and 2 finite positions.  \nDirectional Control Valve (3 ports / 2 positions)  \n -Normally closed directional control valve with 3 ports and 2 finite positions.  \n -Normally open directional control valve with 3 ports and 2 finite positions.  \nDirectional Control Valve (4 ports / 2 positions)  \n -Directional control valve with 4 ports and 2 finite positions  \n[https://www.airlinehyd.com/pages/resources/hydraulic-schematic-symbols](https://www.airlinehyd.com/pages/resources/hydraulic-schematic-symbols)  \nDirectional Control Valve (4 ports / 3 positions)  \n-Directional control valve with 4 ports and 3 finite positions *-(center position can have various flow paths)  \nDirectional control valve (5 ports / 2 positions) Normally a pneumatic valve  \n-Directional control valve with 5 ports and 2 finite positions  \nDirectional control valve (5 ports / 3 positions) Normally a pneumatic valve  \n -Directional control valve with 5 ports and 3 finite positions  \nElectro-Hydraulic Servo Valve  \nThe spool positions on these valves is variable allowing for variable flow conditions.  \n-Single-stage direct operation unit which accepts an analog signal and provides a similar analog fluid power output  \n-Two-stage with mechanical feedback indirect pilot operation unit which accepts an analog signal and provides a similar analog fluid power output  \n[https://www.airlinehyd.com/pages/resources/hydraulic-schematic-symbols](https://www.airlinehyd.com/pages/resources/hydraulic-schematic-symbols)  \nControl Method-Operator symbols for valves  \nManual Control  \n -General symbol of a valve's manual operator (without showing the control type)  \n -Pushbutton  \n -Lever  \n -Foot pedal  \nMechanical Valve Control  \n -Plunger or tracer  \n -Spring (used on one side of a valve to hold it in the normally open or normally closed stat","cbCail7tWfpw3unN","https://ap.wps.com/l/cbCail7tWfpw3unN","pdf",288802,"English","# Hydraulic Schematic Symbols\n## Standard Symbols\n## Lines and Geometric Symbol Types\n## Circular, Square, Diamond, and Miscellaneous Symbols\n## Pumps and Compressors\n## Motors\n## Cylinders and Cushions\n## Directional Control Valves by Ports and Positions\n## Electro-Hydraulic Servo Valves\n## Control Methods for Valves\n## Pressure Control Valves\n## Flow Control Valves","[{\"question\":\"What do continuous and dashed line styles represent in the hydraulic schematic symbols chart?\",\"answer\":\"A continuous line represents a flow line. A dashed line represents pilot and drain signals.\"},{\"question\":\"How are directional control valves categorized in the chart?\",\"answer\":\"Directional control valves are described by their number of ports and positions, such as 2 ports/2 positions, 3 ports/2 positions, 4 ports/2 positions, and combinations like 4 ports/3 positions.\"},{\"question\":\"What is the difference between a pressure relief valve and a proportional pressure relief valve?\",\"answer\":\"A pressure relief valve limits line pressure to a set setting and directs the secondary path to the tank. A proportional pressure relief valve limits line pressure proportionally to an electronic signal.\"}]","Hydraulic Schematic Symbols - Standard Symbols - Lines - Circular - Square - Diamond - Miscellaneous - Pumps and Compressors - Motors | PDF"]