{"id":10246,"date":"2021-09-05T10:00:10","date_gmt":"2021-09-05T18:00:10","guid":{"rendered":"https:\/\/www.linquip.com\/blog\/?p=10246"},"modified":"2025-08-28T02:45:14","modified_gmt":"2025-08-28T10:45:14","slug":"types-of-hydraulic-valves","status":"publish","type":"post","link":"https:\/\/www.linquip.com\/blog\/types-of-hydraulic-valves\/","title":{"rendered":"4 Types of Hydraulic Valves &#038; Their Working Principles"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_83 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.linquip.com\/blog\/types-of-hydraulic-valves\/#Types_of_Hydraulic_Valves\" >Types of Hydraulic Valves<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.linquip.com\/blog\/types-of-hydraulic-valves\/#The_function_of_the_Hydraulic_Control_Valve\" >The function of the Hydraulic Control Valve<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.linquip.com\/blog\/types-of-hydraulic-valves\/#Hydraulic_Valve_Specifications\" >Hydraulic Valve Specifications<\/a><\/li><\/ul><\/nav><\/div>\n<p><span style=\"font-size: 14pt;\">There are many types of hydraulic valves available in the industry. Hydraulic valves are mechanical equipment for controlling the flow of fluid in <a href=\"https:\/\/en.wikipedia.org\/wiki\/Hydraulics\" target=\"_blank\" rel=\"noopener\">hydraulic pipes or systems<\/a>. They can be utilized to thoroughly check the flow level to a specific domain, redirect pressurized fluid or close a line.<\/span><\/p>\n<p><span style=\"font-size: 14pt;\">Hydraulic valves can be used to control the flow of fluid in a circuit as well as the quantity of fluid power. As a result, the pressure and flow rate in various portions of the circuit would be controlled by these valves. Hydraulic valves can regulate system pressure. The hydraulic valve relieves the pressure on the pump or lowers the temperature of the oil before it enters the hydraulic circuit. Different types of hydraulic valves are accessible from a wide range of <a href=\"https:\/\/www.linquip.com\/suppliers-companies?category_id=667&amp;cn=hydraulic-valve\"><strong>Suppliers and Companies<\/strong><\/a>, as well as manufacturers and distributors, and Linquip has a large selection of <a href=\"https:\/\/www.linquip.com\/industrial-directories\/339\/valve\/for-sale\"><strong>Hydraulic Valves for Sale<\/strong><\/a>.<\/span><\/p>\n<p><span style=\"font-size: 14pt;\">Linquip&#8217;s website has a comprehensive list of hydraulic valve services for all OEM fleets. Suppliers of Linquip can help you with this. To learn more about how to connect with a varied collection of service providers who consistently produce high-quality products, please contact <a href=\"https:\/\/www.linquip.com\/experts?category_id=667&amp;cn=hydraulic-valve\"><strong>Hydraulic Valves Experts in Linquip<\/strong><\/a>.<\/span><\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/www.linquip.com\/industrial-directories\/339\/valves-and-parts\/for-sale\/?utm_source=blog&amp;utm_medium=content&amp;utm_campaign=CRO&amp;utm_term=types_of_hydraulic_valves&amp;utm_content=for_sale\" target=\"_blank\" rel=\"noopener\"><strong><span style=\"font-size: 14pt;\" data-sheets-value=\"{&quot;1&quot;:2,&quot;2&quot;:&quot;\u21d2 View a Comprehensive List of Valves and Their Suppliers \u21d0&quot;}\" data-sheets-userformat=\"{&quot;2&quot;:961,&quot;3&quot;:{&quot;1&quot;:0},&quot;9&quot;:1,&quot;10&quot;:1,&quot;11&quot;:4,&quot;12&quot;:0}\"><span style=\"font-size: 24pt;\">\u21d2<\/span> <span style=\"text-decoration: underline;\">View a Comprehensive List of Valves and Their Suppliers<\/span> <span style=\"font-size: 24pt;\">\u21d0<\/span><\/span><\/strong><\/a><\/p>\n<h2><strong>Types of Hydraulic Valves<br \/>\n<\/strong><\/h2>\n<p><span style=\"font-size: 14pt;\">Hydraulic valves are available in various characteristics similar to other <a href=\"https:\/\/www.linquip.com\/blog\/industrial-valves\/\">valves<\/a>, such as bypass, needle, regulating, relief, ball, butterfly, pilot-operated, check, diverter, proportional, and directional. In general, these hydraulic valves may be described as being of three main varieties which are:<\/span><\/p>\n<ul>\n<li><span style=\"font-size: 14pt;\">Hydraulic Flow Control Valves<\/span><\/li>\n<li><span style=\"font-size: 14pt;\">Hydraulic Pressure Control Valves<\/span><\/li>\n<li><span style=\"font-size: 14pt;\">Hydraulic Directional Control Valves<\/span><\/li>\n<\/ul>\n<figure id=\"attachment_10252\" aria-describedby=\"caption-attachment-10252\" style=\"width: 974px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"size-full wp-image-10252\" src=\"https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/07\/blain_KV2-S_rgb_034.jpg\" alt=\"Types of Hydraulic Valves \" width=\"974\" height=\"699\" title=\"\" srcset=\"https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/07\/blain_KV2-S_rgb_034.jpg 974w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/07\/blain_KV2-S_rgb_034-300x215.jpg 300w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/07\/blain_KV2-S_rgb_034-768x551.jpg 768w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/07\/blain_KV2-S_rgb_034-696x499.jpg 696w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/07\/blain_KV2-S_rgb_034-585x420.jpg 585w\" sizes=\"(max-width: 974px) 100vw, 974px\" \/><figcaption id=\"caption-attachment-10252\" class=\"wp-caption-text\">Elevator hydraulic valve (Reference: blain.de)<\/figcaption><\/figure>\n<h3><strong>Hydraulic Flow Control Valves <\/strong><\/h3>\n<p><span style=\"font-size: 14pt;\">Hydraulic flow control valves are used to regulate the flow volume of passing fluid in hydraulic systems. These types of valves have a movable gate that changes the flow domain to modify the flow rate in the valve. For example, this type of hydraulic valve would be used in control circuits for devices, such as actuators, cylinders, or motors. The speed of these devices is a function of flow rate linearly, i.e. decreasing the flow rate reduces their driving speed and vice versa.<\/span><\/p>\n<p><span style=\"font-size: 14pt;\">The different types of hydraulic flow control valves are movable flow control valves, pressure compensated flow control valves, fixed flow control valves, and throttling flow control valves. The method of flow control in these valves are modifying based on the mechanical shape of the valve, which regularly is one of the well-known styles same as other valves, namely:<\/span><\/p>\n<ul>\n<li><span style=\"font-size: 14pt;\">Ball<\/span><\/li>\n<li><span style=\"font-size: 14pt;\">Butterfly<\/span><\/li>\n<li><span style=\"font-size: 14pt;\">Diaphragm<\/span><\/li>\n<li><span style=\"font-size: 14pt;\">Needle<\/span><\/li>\n<li><span style=\"font-size: 14pt;\">Plug<\/span><\/li>\n<\/ul>\n<p><span style=\"font-size: 14pt;\">We can measure flow rate in many distinct ways, which are not similar, so choosing a flow control valve demands understanding what is expected by flow rate. The three standard types of flow rate are:<\/span><\/p>\n<ol>\n<li><span style=\"font-size: 14pt;\">Mass flow rate \u2013 we measure the mass per unit time in the units such as the kg\/min or slugs\/sec.<\/span><\/li>\n<li><span style=\"font-size: 14pt;\">Weight flow rate \u2013 we measure weight per unit time in the units such as lb\/sec.<\/span><\/li>\n<li><span style=\"font-size: 14pt;\">Volumetric flow rate \u2013 we measure volume per unit time in the units such as the cc\/min or in3\/sec.<\/span><\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<p><span style=\"font-size: 14pt;\">Some of the conventional hydraulic flow control valves are:<\/span><\/p>\n<ul>\n<li><span style=\"font-size: 14pt;\">Pressure-compensated proportional flow-control valves<\/span><\/li>\n<li><span style=\"font-size: 14pt;\">Deceleration valves<\/span><\/li>\n<li><span style=\"font-size: 14pt;\">Proportional flow-control logic valves<\/span><\/li>\n<li><span style=\"font-size: 14pt;\">Pressure- and temperature-compensated, variable flow valves<\/span><\/li>\n<li><span style=\"font-size: 14pt;\">Pressure-compensated, variable flow valves<\/span><\/li>\n<li><span style=\"font-size: 14pt;\">Priority valves<\/span><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3><strong>Hydraulic Pressure Control Valves<\/strong><\/h3>\n<p><span style=\"font-size: 14pt;\">Hydraulic pressure control valves are used to regulate the fluid pressure passing through hydraulic arrangements to keep that pressure at desired amount as restricted by the system operator. Fluid systems are typically produced for operation at a fixed range of pressures. These valves serve a crucial role in preventing rises in pressure that may result in hydraulic fluid leaks or the bursting of pipes and tubes. They are also installed to have the desired pressure in some sections of a hydraulic circuit.<\/span><\/p>\n<p><span style=\"font-size: 14pt;\">Several kinds of pressure control valves are widespread in hydraulic systems, including reducing valves, relief valves, sequence valves, counterbalance valves, and unloading valves.<\/span><\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<figure id=\"attachment_10249\" aria-describedby=\"caption-attachment-10249\" style=\"width: 500px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"size-full wp-image-10249\" src=\"https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/07\/IS-HYD-SICV_PRESSURE_CONTROL_VALVES_C-500x500_72dpi.jpg\" alt=\"Types of Hydraulic Valves \" width=\"500\" height=\"500\" title=\"\" srcset=\"https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/07\/IS-HYD-SICV_PRESSURE_CONTROL_VALVES_C-500x500_72dpi.jpg 500w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/07\/IS-HYD-SICV_PRESSURE_CONTROL_VALVES_C-500x500_72dpi-300x300.jpg 300w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/07\/IS-HYD-SICV_PRESSURE_CONTROL_VALVES_C-500x500_72dpi-150x150.jpg 150w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/07\/IS-HYD-SICV_PRESSURE_CONTROL_VALVES_C-500x500_72dpi-420x420.jpg 420w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><figcaption id=\"caption-attachment-10249\" class=\"wp-caption-text\">Pressure control valves (Reference: eaton.com)<\/figcaption><\/figure>\n<p style=\"text-align: center;\"><a href=\"https:\/\/www.linquip.com\/industrial-directories\/352\/control-valve\/for-sale\/?utm_source=blog&amp;utm_medium=content&amp;utm_campaign=CRO&amp;utm_term=types_of_hydraulic_valves&amp;utm_content=for_sale\" target=\"_blank\" rel=\"noopener\"><span style=\"text-decoration: underline;\"><strong>See All Control Valve for Sale<\/strong><\/span><\/a><\/p>\n<h3><strong>Hydraulic Directional Control Valves<\/strong><\/h3>\n<p><span style=\"font-size: 14pt;\">We use hydraulic directional control valves to track fluid in a system or circuit to several devices as demanded. They shift between discrete positions such as extend, retract, or neutral locations for controlling a hydraulic cylinder. They can also change into intermediate states to control an actuator&#8217;s acceleration, speed or direction.<\/span><\/p>\n<p><span style=\"font-size: 14pt;\">Discrete hydraulic Directional control valves are a simple form of binary valves, passing blocking the fluid flow. If fluid tries to pass in the reverse direction, a check valve seals the system using a ball, plunger or poppet.<\/span><\/p>\n<p><span style=\"font-size: 14pt;\">Hydraulic directional control valves with more complicated characteristics may have multiple gates, as their characteristics allow them to switch fluid within distinct ports depending on the device they supply with hydraulic fluid. Consequently, they are discriminated against by standardized numbering systems that have two values, the same as 4\/3 or 2\/2. The first number indicates the number of valve ports, and the second number indicates the number of valve positions that the device can achieve.<\/span><\/p>\n<p><span style=\"font-size: 14pt;\">According to this coding scheme, 2\/2 represents a two-state valve and 4\/3 a four-state valve with three positions. There are three positions in the 4\/3 valve that can be utilized to control a hydraulic cylinder:<\/span><\/p>\n<p><span style=\"font-size: 14pt;\">Extend \u2013 liquid enters the cylinder by way of a hydraulic pump, causing it to extend.<\/span><\/p>\n<p><span style=\"font-size: 14pt;\">Retract \u2013 liquid is introduced from the hydraulic pump to the rod end of the cylinder, which in turn causes it to retract.<\/span><\/p>\n<p><span style=\"font-size: 14pt;\">Neutral \u2013 all liquid ports are blocked, so there is no flow of liquid.<\/span><\/p>\n<p><span style=\"font-size: 14pt;\">Here we list some of the classes for directional-control valves. You can identify these valves according to the:<\/span><\/p>\n<ul>\n<li><span style=\"font-size: 14pt;\">The number of flow ways in the extreme positions.<\/span><\/li>\n<li><span style=\"font-size: 14pt;\">The number of spool positions.<\/span><\/li>\n<li><span style=\"font-size: 14pt;\">Method of providing spool return.<\/span><\/li>\n<li><span style=\"font-size: 14pt;\">Method of shifting a spool.<\/span><\/li>\n<li><span style=\"font-size: 14pt;\">Flow pattern in the crossover or center position.<\/span><\/li>\n<\/ul>\n<figure id=\"attachment_10248\" aria-describedby=\"caption-attachment-10248\" style=\"width: 2560px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"size-full wp-image-10248\" src=\"https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/07\/HTB1p3RpatjvK1RjSspiq6AEqXXaZ-scaled.jpg\" alt=\"Types of Hydraulic Valves \" width=\"2560\" height=\"2380\" title=\"\" srcset=\"https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/07\/HTB1p3RpatjvK1RjSspiq6AEqXXaZ-scaled.jpg 2560w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/07\/HTB1p3RpatjvK1RjSspiq6AEqXXaZ-300x279.jpg 300w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/07\/HTB1p3RpatjvK1RjSspiq6AEqXXaZ-1024x952.jpg 1024w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/07\/HTB1p3RpatjvK1RjSspiq6AEqXXaZ-768x714.jpg 768w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/07\/HTB1p3RpatjvK1RjSspiq6AEqXXaZ-1536x1428.jpg 1536w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/07\/HTB1p3RpatjvK1RjSspiq6AEqXXaZ-2048x1904.jpg 2048w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/07\/HTB1p3RpatjvK1RjSspiq6AEqXXaZ-696x647.jpg 696w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/07\/HTB1p3RpatjvK1RjSspiq6AEqXXaZ-1392x1294.jpg 1392w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/07\/HTB1p3RpatjvK1RjSspiq6AEqXXaZ-1068x993.jpg 1068w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/07\/HTB1p3RpatjvK1RjSspiq6AEqXXaZ-1920x1785.jpg 1920w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/07\/HTB1p3RpatjvK1RjSspiq6AEqXXaZ-452x420.jpg 452w\" sizes=\"(max-width: 2560px) 100vw, 2560px\" \/><figcaption id=\"caption-attachment-10248\" class=\"wp-caption-text\">spool control valve hydraulic valve (Reference: alibaba.com)<\/figcaption><\/figure>\n<p style=\"text-align: center;\"><a href=\"https:\/\/www.linquip.com\/industrial-directories\/343\/check-valve\/for-sale\/?utm_source=blog&amp;utm_medium=content&amp;utm_campaign=CRO&amp;utm_term=types_of_hydraulic_valves&amp;utm_content=for_sale\" target=\"_blank\" rel=\"noopener\"><span style=\"text-decoration: underline;\"><strong> See All Check Valve for Sale<\/strong><\/span><\/a><\/p>\n<h4><strong>Hydraulic Four-Way Valves<br \/>\n<\/strong><\/h4>\n<p><span style=\"font-size: 14pt;\">Four-way directional-control valves are installed to manage the direction of fluid flow in a hydraulic line, which commands the direction of the rotation of a fluid motor or the movement of a working cylinder. These valves usually are the sliding-spool model. Standard four-way directional-control valves have four ports:<\/span><\/p>\n<ul>\n<li><span style=\"font-size: 14pt;\">The exit or return port is attached to a reservoir.<\/span><\/li>\n<li><span style=\"font-size: 14pt;\">The pressure line is connected to a pressure port.<\/span><\/li>\n<li><span style=\"font-size: 14pt;\">Two operating ports are connected to an actuating unit.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-size: 14pt;\">Four-way valves have a rectangular cast frame, a sliding spool and a way to locate a spool. A spool is a precision fitted to a bore by the longitudinal axis of a body. The lands of a spool partition this bore into a set of separate chambers. Ports in a valve&#8217;s body lead into a section so that a spool&#8217;s situation determines which ports are open and which ones are closed. Ports that are sealed off from others in one position may be interconnected in different positions. Spool positioning is completed mechanically, electrically, manually, or hydraulically.<\/span><\/p>\n<p><span style=\"font-size: 14pt;\">The figure below shows how the spool location determines the possible flow states in the line. The four ports are labeled as P, T, A, and B: P is connected to the flow reservoir; T to the tank; and A and B to the ports of the working hydraulic motor, cylinder, or some other valve in the path. In figure A, the spool is in a position that port P is free to port A, and port B is free to port T. Ports A and B are joined to the ports of the cylinder, flowing through port P, and make the piston of the cylinder to travel to the right. Return flow from the cylinder moves through ports B and T. In figure B, port P is free to port B, and the piston travels to the left. Return flow from the cylinder reaches ports A and T.<\/span><\/p>\n<figure id=\"attachment_10250\" aria-describedby=\"caption-attachment-10250\" style=\"width: 456px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"size-full wp-image-10250\" src=\"https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/07\/1-3.jpg\" alt=\"Types of Hydraulic Valves \" width=\"456\" height=\"287\" title=\"\" srcset=\"https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/07\/1-3.jpg 456w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/07\/1-3-300x189.jpg 300w\" sizes=\"(max-width: 456px) 100vw, 456px\" \/><figcaption id=\"caption-attachment-10250\" class=\"wp-caption-text\">Hydraulic four-way valve (Reference: valvehydraulic.info)<\/figcaption><\/figure>\n<p>The table below is presented all Types of hydraulic valves.<\/p>\n<table width=\"623\">\n<tbody>\n<tr>\n<td colspan=\"2\" width=\"288\">Classification<\/td>\n<td width=\"336\">Description<\/td>\n<\/tr>\n<tr>\n<td rowspan=\"4\" width=\"114\">Control type<\/td>\n<td width=\"174\">Manual operated<\/td>\n<td width=\"336\">The hand lever shifts the spool.<\/td>\n<\/tr>\n<tr>\n<td width=\"174\">Pilot operated<\/td>\n<td width=\"336\">Hydraulic pressure shifts the spool.<\/td>\n<\/tr>\n<tr>\n<td width=\"174\">Solenoid operated<\/td>\n<td width=\"336\">Solenoid action shifts the spool.<\/td>\n<\/tr>\n<tr>\n<td width=\"174\">Solenoid controlled, pilot operated<\/td>\n<td width=\"336\">Solenoid action shifts the integral pilot spool and directs the pilot flow to move the main spool.<\/td>\n<\/tr>\n<tr>\n<td rowspan=\"2\" width=\"114\">Path of flow type<\/td>\n<td width=\"174\">Two way<\/td>\n<td width=\"336\">Allows two possible flow paths in two spool positions<\/td>\n<\/tr>\n<tr>\n<td width=\"174\">Four-way<\/td>\n<td width=\"336\">Allows four possible flow paths in two spool positions<\/td>\n<\/tr>\n<tr>\n<td rowspan=\"2\" width=\"114\">Position type<\/td>\n<td width=\"174\">Two-position<\/td>\n<td width=\"336\">The spool has two positions of dwell.<\/td>\n<\/tr>\n<tr>\n<td width=\"174\">Three-position<\/td>\n<td width=\"336\">The spool has two positions plus one center or intermediate position.<\/td>\n<\/tr>\n<tr>\n<td rowspan=\"5\" width=\"114\">Spool type<\/td>\n<td width=\"174\">Open center<\/td>\n<td width=\"336\">include five of the common spool types.<\/td>\n<\/tr>\n<tr>\n<td width=\"174\">Close center<\/td>\n<td width=\"336\"><\/td>\n<\/tr>\n<tr>\n<td width=\"174\">Partially closed center<\/td>\n<td width=\"336\"><\/td>\n<\/tr>\n<tr>\n<td width=\"174\">Semi-open center<\/td>\n<td width=\"336\"><\/td>\n<\/tr>\n<tr>\n<td width=\"174\">Tandem center<\/td>\n<td width=\"336\"><\/td>\n<\/tr>\n<tr>\n<td rowspan=\"3\" width=\"114\">Spring type<\/td>\n<td width=\"174\">Spring offset<\/td>\n<td width=\"336\">Spring action automatically turns the spool to the normal offset position when shifter force is released. (Spring offset is always a type of the two-way valve)<\/td>\n<\/tr>\n<tr>\n<td width=\"174\">No spring<\/td>\n<td width=\"336\">The spool is not spring-loaded; it is moved only by force, and it remains where it is moved (two- or three-position type, however, the three-position type uses detent).<\/td>\n<\/tr>\n<tr>\n<td width=\"174\">Spring centered<\/td>\n<td width=\"336\">Spring action automatically turns the spool to the center position with releasing force. (Spring-centered is a type three-position valve.)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"The_function_of_the_Hydraulic_Control_Valve\"><\/span><strong>The function of the Hydraulic Control Valve<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-size: 14pt;\">Several hydraulic directional control valves have spools. Spools slide between parts allowing liquid to flow in open gates, based on the state of the spool in the body. Valves may have one or multiple spools to achieve the designed port control. Other flow control elements in these valves may be poppets or plungers.<\/span><\/p>\n<p><span style=\"font-size: 14pt;\">The valve part that drives these flow control components is known as the actuator or operator of the valve. These hydraulic valves can present proper timing or sequencing of the valve position modifications needing to control the hydraulic systems or circuits. There are many possibilities for the actuator mechanism, including pilot, electrical\/electronic, mechanical actuation.<\/span><\/p>\n<p><span style=\"font-size: 14pt;\"><strong>Mechanical Actuation_<\/strong>Mechanical actuation can have hand-operated valve controls such as levers, pushbuttons, or pedals, but more often are automated mechanical tools such as cams, levers, springs, and rollers.<\/span><\/p>\n<p><span style=\"font-size: 14pt;\"><strong>Pilot actuation_<\/strong>Pilote actuation applies pressurized fluid to assist with moving the valve flow control elements. This operator style is also helpful in dangerous circumstances where electrical\/electronic equipment performance may not be suggested because of the possible risk of causing an explosion.<\/span><\/p>\n<p><span style=\"font-size: 14pt;\"><strong>Electrical\/electronic actuation_<\/strong>Electrical\/electronic actuation needs solenoids that convert electrical signals of current supplied to the solenoid coil into a plunger&#8217;s mechanical action that makes either rotary or linear movement. Electrical solenoids have some constraints in producing power, so switching high-pressure hydraulic systems by direct response is impossible. Coupling solenoid with pilot actuation allows the solenoids to switch lower pressure pilot operations to control higher pressure ports.<\/span><\/p>\n<p>&nbsp;<\/p>\n<figure id=\"attachment_10251\" aria-describedby=\"caption-attachment-10251\" style=\"width: 564px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"size-full wp-image-10251\" src=\"https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/07\/a83f3061177fbf2673923f12ae063158.jpg\" alt=\"Types of Hydraulic Valves \" width=\"564\" height=\"553\" title=\"\" srcset=\"https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/07\/a83f3061177fbf2673923f12ae063158.jpg 564w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/07\/a83f3061177fbf2673923f12ae063158-300x294.jpg 300w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2021\/07\/a83f3061177fbf2673923f12ae063158-428x420.jpg 428w\" sizes=\"(max-width: 564px) 100vw, 564px\" \/><figcaption id=\"caption-attachment-10251\" class=\"wp-caption-text\">Solenoid hydraulic valve (Reference: pinterest.com)<\/figcaption><\/figure>\n<p style=\"text-align: center;\"><a href=\"https:\/\/www.linquip.com\/industrial-directories\/996\/flap-valve\/for-sale\/?utm_source=blog&amp;utm_medium=content&amp;utm_campaign=CRO&amp;utm_term=types_of_hydraulic_valves&amp;utm_content=for_sale\" target=\"_blank\" rel=\"noopener\"><span style=\"text-decoration: underline;\"><strong> See All Flap Valve for Sale<\/strong><\/span><\/a><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Hydraulic_Valve_Specifications\"><\/span><strong>Hydraulic Valve Specifications<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-size: 14pt;\">Hydraulic valves are specified utilizing several parameters related to their size, connections, flow capacity, and actuation mechanism. The typical properties for these valves are described below but remember that there can be exceptions in these parameters among different valve suppliers and manufacturers. So differences in design may exist from supplier to supplier. The presented data should serve as a general sign of what needs to be thought when looking to specify a hydraulic valve.<\/span><\/p>\n<ul>\n<li><span style=\"font-size: 14pt;\"><strong>Valve type_<\/strong>refers to the particular hydraulic valve type needed, which may display the physical style (ball, check, needle, etc.) or may refer to the control being explored (flow control, pressure control, or directional control).<\/span><\/li>\n<li><span style=\"font-size: 14pt;\"><strong>Valve actuation mechanism_\u00a0<\/strong>reflects how the valve position is changed or how the valve is operated, such as a solenoid, pilot, or mechanical.<\/span><\/li>\n<li><span style=\"font-size: 14pt;\"><strong>Valve configuration_\u00a0<\/strong>indicates the number of ports, the number of switching positions or states, and the specified rest state for the valve, e.g., 3\/2 normally closed (NC).<\/span><\/li>\n<li><span style=\"font-size: 14pt;\"><strong>Body material_<\/strong>classifies the material from which the valve body is manufactured: brass, bronze, aluminum, stainless steel, or engineered plastic.<\/span><\/li>\n<li><span style=\"font-size: 14pt;\"><strong>Media type \u2013<\/strong>identifies the type of the specific fluid (liquid or gas) for which the valve can handle without any deleterious effects. Examples of media types include oil, fuel, and water.<\/span><\/li>\n<li><span style=\"font-size: 14pt;\"><strong>Port size_<\/strong>shows the dimensional sizes for the inlet and outlet ports of the valve, designed in metric units such as millimeters or imperial units such as inches.<\/span><\/li>\n<li><span style=\"font-size: 14pt;\"><strong>Port type (or mounting type)_<\/strong>classifies the desired mounting\/interface or port-style for the valve, such as manifold, flanged, threaded, etc.<\/span><\/li>\n<li><span style=\"font-size: 14pt;\"><strong>Operating voltage_<\/strong>is for electrically actuated valves and indicates both the magnitude and type of electrical control signal applied to energize the valve solenoid. Solenoid valves are prepared with a wide range of AC and DC working voltages that may be used to give different application conditions.<\/span><\/li>\n<li><span style=\"font-size: 14pt;\"><strong>Operating frequency_<\/strong>for AC voltage powered electrically actuated valves; frequency is the number of cycles per second of the alternating current connected to the solenoid, known usually in Hertz (for example, 60 Hz).<\/span><\/li>\n<li><span style=\"font-size: 14pt;\"><strong>Flow coefficient_<\/strong>the flow coefficient (Cv) of the valve measures the valve&#8217;s capacity to allow the flow of fluid through it. The conventional definition of flow coefficient is that it expresses the volume of water (in U.S. gallons) that will flow through the system at a temperature of 60oF in a one-minute period of time when there is a one psi pressure drop (outlet-inlet differential pressure) across the valve. Larger values of flow coefficient mean a larger amount of flow.<\/span><\/li>\n<li><span style=\"font-size: 14pt;\"><strong>Flow rate_<\/strong>rather than flow coefficient, valve suppliers may define the valve&#8217;s flow rate in units such as liters or gallons per minute.<\/span><\/li>\n<li><span style=\"font-size: 14pt;\"><strong>Maximum rated pressure_<\/strong>is the maximum pressure that the valve can work when installed in the hydraulic circuit.<\/span><\/li>\n<li><span style=\"font-size: 14pt;\"><strong>Minimum operating pressure_<\/strong>displays the lowest pressure in the system for the valve to operate effectively. While many direct operated valves can work at 0 bar pressure, indirect operated valves may need a minimum pressure to exist that can be used to support valve actuation. Some valves are designed using a pressure range.<\/span><\/li>\n<li><span style=\"font-size: 14pt;\"><strong>Operating temperature or temperature range_<\/strong>shows the prescribed range of temperatures over which the valve has been produced to function.<\/span><\/li>\n<li><span style=\"font-size: 14pt;\"><strong>Application_<\/strong>indicates the expected use or market for the valve, including elevators, chemicals, or aircraft. The understanding of industry may help bring to the surface additional qualifications or specifications necessitated by these working conditions.<\/span><\/li>\n<li><span style=\"font-size: 14pt;\"><b>Buy Equipment or Ask for a Service<\/b><\/span><\/li>\n<li><span style=\"font-size: 14pt;\">By using Linquip RFQ Service, you can expect\u00a0to receive quotations from various suppliers across multiple industries and regions.<\/span><\/li>\n<\/ul>\n<p style=\"text-align: center;\"><strong><a href=\"http:\/\/linquip.com\/get-quote?utm_source=blog&amp;utm_medium=content&amp;utm_campaign=product_list&amp;utm_term=product_list&amp;utm_content=rfq\" target=\"_blank\" rel=\"noopener\">Click Here to Request a Quotation From Suppliers and Service Providers<\/a><\/strong><\/p>\n<p><em><strong>Read More on Linquip<\/strong><\/em><\/p>\n<ul>\n<li><strong><span style=\"text-decoration: underline;\"><span style=\"font-size: 10pt; font-family: verdana, geneva, sans-serif;\"><a title=\"Ball Valve Manufacturers\" href=\"https:\/\/www.linquip.com\/suppliers-companies\/manufacturer?category_id=341&amp;cn=ball-valve\" target=\"_blank\" rel=\"noopener\">Ball Valve Manufacturers<\/a><\/span><\/span><\/strong><\/li>\n<li><strong><span style=\"text-decoration: underline;\"><span style=\"font-size: 10pt; 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Working Principle, Types &amp; Applications<\/a><\/span><\/span><\/strong><\/li>\n<li><strong><span style=\"text-decoration: underline;\"><span style=\"font-size: 10pt; font-family: verdana, geneva, sans-serif;\"><a href=\"https:\/\/www.linquip.com\/blog\/what-are-coaxial-valves-working-principles-and-types\/\" target=\"_blank\" rel=\"noopener\">What are Coaxial Valves? Working Principles and Type<\/a><\/span><\/span><\/strong><\/li>\n<li><strong><span style=\"text-decoration: underline;\"><span style=\"font-size: 10pt; font-family: verdana, geneva, sans-serif;\"><a href=\"https:\/\/www.linquip.com\/blog\/what-is-isolation-valve\/\" target=\"_blank\" rel=\"noopener\">What is Isolation Valve? Working Principle &amp; Types<\/a><\/span><\/span><\/strong><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>There are many types of hydraulic valves available in the industry. Hydraulic valves are mechanical equipment for controlling the flow of fluid in hydraulic pipes or systems. They can be utilized to thoroughly check the flow level to a specific domain, redirect pressurized fluid or close a line. Hydraulic valves can be used to control &#8230;<\/p>\n","protected":false},"author":12,"featured_media":10247,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","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":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","footnotes":""},"categories":[13],"tags":[334,331],"class_list":["post-10246","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-valves","tag-device-characteristic","tag-industrial-types"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.linquip.com\/blog\/wp-json\/wp\/v2\/posts\/10246","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.linquip.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.linquip.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.linquip.com\/blog\/wp-json\/wp\/v2\/users\/12"}],"replies":[{"embeddable":true,"href":"https:\/\/www.linquip.com\/blog\/wp-json\/wp\/v2\/comments?post=10246"}],"version-history":[{"count":8,"href":"https:\/\/www.linquip.com\/blog\/wp-json\/wp\/v2\/posts\/10246\/revisions"}],"predecessor-version":[{"id":36636,"href":"https:\/\/www.linquip.com\/blog\/wp-json\/wp\/v2\/posts\/10246\/revisions\/36636"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.linquip.com\/blog\/wp-json\/wp\/v2\/media\/10247"}],"wp:attachment":[{"href":"https:\/\/www.linquip.com\/blog\/wp-json\/wp\/v2\/media?parent=10246"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.linquip.com\/blog\/wp-json\/wp\/v2\/categories?post=10246"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.linquip.com\/blog\/wp-json\/wp\/v2\/tags?post=10246"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}