When the flow exceeds the valve setting (reaction flow), the valve will block the flow. • Valve piston in the main body is sticking. External Leaks What Do You Think? 9580 – Check valve with 3/8" NPTF male ends. It does this by filling and emptying the lifter with engine oil through a metering orifice and a check valve. • Adjustment is incorrect. A foamy appearance indicates air in the fluid. These go beyond the problems with the spool itself and incorporate problems with the entire cylinder the spool valve is a part of, including other components of the hydraulic system. Otherwise, the spring could be the problem. Counterclockwise rotation until beam stops traveling down. Load-holding valves, also known as over-center valves or counterbalance valves are a type of pressure control valve. They prevent loads on cylinders or motors dropping in an uncontrolled manner. Dirt in the system could come from contamination from parts breaking down or an old filter. Also, the fluid should never have visible dirt in it to protect the longevity and operation of the equipment. Check valve Application: Permits flow of hydraulic oil in one direction only. Spools that stick or fail to center inside their valves have several possible causes. What were the solutions your business sought? Spool Binding Removing the locking nut gives you access to the adjustment screw. JIS Standard Compact Hydraulic Cylinder Series CH KDB ø20, ø25, ø32, ø40, ø50, ø63, ø80, ø100 10MPa Note) • Solid state switches marked "" are produced upon receipt of order. A lock valve is a double section pilot-operated check valve. Hydraulic Holding Valve Cat349d,Boom Cylinder Valve 345d/349d For Excavator , Find Complete Details about Hydraulic Holding Valve Cat349d,Boom Cylinder Valve 345d/349d For Excavator,Valve Cat349d,Valve 345d/,Excavator Holding Valve from Construction Machinery Parts Supplier or Manufacturer-Guangzhou Xunpo Machinery Equipment Co., Ltd. How Do You Adjust a Hydraulic Spool Valve? To adjust the spool valve, loosen the valve-locking nut on the side. The Holding Valve catgeory includes: Prince RD-1650 Pilot Operated (Single) Check Valves Sun Single Holding Check Valves Sun Double Holding Check Valves (585) 328 … Load-holding valves, also known as over-center valves or counterbalance valves are a type of pressure control valve. No. A lack of pressure may occur when the centering spring is defective or does not work well. The first two problems relate to how hydraulic systems work. If you correctly adjusted the spool valve and still have problems, you may need to try troubleshooting the valves in your hydraulic system. A lock valve may be placed in the lines to the cylinder. • Poppets or seats are worn or damaged. • Valve in the body or on the seat is cocking. The valves will have a factory-set pressure and pressure range that you can safely set them to. Wt., 1,7 kg. Generally, only three main issues exist for these hydraulic components. To set load turn an additional ¾ to 1 full turn & tighten lock nut. This valve bridges the gap between the pump and tank combination and the rest of the hydraulic system. However, solenoid cartridge seals may solve the seepage. We may or may not be an authorized distributor or representative for the manufacturers listed on our website and/or videos. Replacing the O-rings on cross spool valves often fixes leaks from these areas caused by old or worn seals. The flow rate will help determine pressure. They prevent loads on cylinders or motors dropping in an uncontrolled manner. Internal components: hardened and ground steel. Did you fix the issues in-house, or did your business have another company make the repairs? Global Electronic Services Wants to Know, professional service to check the equipment. Without knowing how the valves work, though, floor managers may stop production for too long, causing major setbacks. Different types of spool valves may have solenoid, hydraulic, spring, manual or proportional operators — not just spring and solenoid. The performance of overcenter valves are at best when mounted into the actuator, whether it is a linear (cylinder) or a rotary (hydraulic motor) actuator. Hydraulic spool valve operation requires repairs and troubleshooting procedures not used for other types of devices. Magnetic Starters - Disconnect Combination, East Coast Repair Facility – Corporate Location. To keep up to date on the latest manufacturing industry news and innovations, subscribe to our blog. Change filters regularly. The general design of a spool valve is difficult to see because a cylinder encases the mechanism. Notice that increasing the volume makes the change in pressure negative. Minor leaks may occur inside the valve without issue. Solenoid spool valves lack O-rings. The foundation of spool valves is their fine movement, and if anything prevents the spool from cleanly moving, it can reduce the effectiveness of the spool valve. All rights reserved. Several systems in a manufacturing facility may use spool valves in their hydraulic systems. What Is a Hydraulic Spool Valve? Inlet pressue rating of aluminum body is 3000 PSI. In short, the counterbalance valve permits flow in one direction and block the flow opposite to it. For higher flow rates, lower the pressure of the valve to make up for the higher pressure from the increased fluid flow. • Orifice or balance hold is blocked. • Poppets or seats are worn or damaged. A hydraulic system may experience other issues caused by the spool valve. Don’t attempt to disassemble the hydraulic system without knowledge of how to piece it back together. When the operator intends to keep the load still and has the directional control in the closed position, the free flow check will prevent fluid from moving from the rod end of the cylinder to tank and hold the load in position. • Orifice or balance hold is blocked. Search the Most Complete Repair Pricing Online Here. These combinations of ports and positions make spool valves versatile and extremely useful. Operation of the hydraulic system comes from maintaining the pressure of the fluid and ensuring all parts fit correctly to prevent leaks. Leave your answers and other comments below. An overcenter valve can be described as a pilot-assisted relief valve with an integral free flow check. The number of inlet ports from the hydraulic tank and pump and the number of outlets to various work locations indicate the type of valve. adjustment clockwise rotation Increases This website and videos on the website are not necessarily approved or endorsed by the trade names listed on the website and/or videos. Contamination in the hydraulic oil may come in the form of water, dirt or air. This valve can also be used with hydraulic motors and is then commonly called a brake valve. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of WTWH Media. In the case of water or air, check the system for leaks. To keep the system running at its peak, schedule regular hydraulic system maintenance. Hydraulic Cartridge Systems Check Valves Shuttle Valves Load/Motor Controls Flow Controls ... Work Port of the holding valve when the actuator is pressurized. Typical pilot-operated check valve applications include: stopping a cylinder in place when the directional valve is centered, holding a clamp in position, or maintaining a tool position. If these conditions persist after making corrections, get an expert repairperson to service the system. SUN Holding Valves - Smooth, chatter-free cylinder control. Designation Load holding valve (over center valve), with hydraulic release and by-pass check valve Valve design Load holding valve: cone seated piston valve by-pass check valve: disk seated valve Installed position Amy Ports F, F1, F2, V, V1, V2 and R Main ports M, S, Z Control- and probing ports depending on version Cloudy fluid means there is water in the fluid. In addition to the lock valve, the spool in Valve 2 must be a float center type, venting both cylinder ports to tank when the spool is centered. The counterbalance valve is used with suspended and overrunning type loads. • Dirt, chip, or burrs are holding the valve partially open. The specifics of spool valve operation depend on the exact configuration of the valve. A rancid odor hints at burned fluid. Burned fluid could indicate overheating. Gaps in the spool and internal structure allow for leakage of hydraulic fluid. In order to adjust the preload, the lifter must be properly located on the base circle or “heel” of the lobe. How to fix these problems depends on the source of the leak. Counterbalance valve provides smooth, positive motion control of a cylinder with a high load-generated pressure tending to cavitate it, such as on booms, cranes or outriggers, or on overcenter Install a new spool valve to remedy this issue. The resulting cylinder pressure intensification in the cylinder rod end rises faster than the check valve pilot ratio can overcome. The general design of a spool valve is difficult to see because a cylinder encases the mechanism. A load-holding valve provides the needed control by relieving flow from the rod end of the cylinder. Part of the system is the hydraulic spool valve, which is a type of directional control valve. Maintenance Tasks to Prevent Problems You will notice that there are 3 custom bent steel hydraulic lines, the cast iron valve body and one double-ended hydraulic fitting that acts as a union between the drive motor and the valve … Hydraulic systems use fluid to increase the mechanical ability of the system. In contrast, a hydraulic lifter is designed to accommodate variations in valve train clearance; in order to automatically maintain zero lash in the valvetrain under all operating conditions. Modern hydraulic systems now include many upgrades not seen in older models. Internal Leaks Were they effective? Unlike the standard hose burst valves these include an external flow adjuster. Check the valve’s mounting to see if it is the cause of the off-center spool. Depending on the hydraulic system, more than a dozen spool valve options exist. • Spring ends are damaged. Choosing a preventative maintenance task rather than putting it off until you must make emergency repairs will prevent downtime and lower costs. To avoid costly replacements that could eat into a company’s profits, floor managers must understand how these valves work and recognize signs that they need adjustments or other repairs. Wt., 0,2 kg. Valves that require adjustment could impact the operation of the entire hydraulic system. However, most hydraulic systems are closed, which should not require new fluid to be added. The screen is the first line of defense against debris in the hydraulic oil. A dirty filter makes the pump work harder to force the fluid through it. Look at the hydraulic oil carefully. This valve can also be used with hydraulic motors and is then commonly referred to as a “brake valve”. The lock valve will prevent cylinder … So, if you see a 4/3, the spool valve has four ports — or ways — and three positions. As 7 A 1 As 8 A 1. hydraulic fluid dirty 2. hydraulic fluid foams 1. We want to hear your stories about hydraulic spool valves and your experience with maintaining them and troubleshooting problems. Tips for Troubleshooting Your Hydraulic Spool Valve, What Do You Think? Trouble Shooting Guide for Rephasing Cylinder Systems Rephase the cylinder lift system prior to troubleshooting by raising the machine completely and holding the tractor valve … • Dirt, chip, or burrs are holding the valve partially open. Frequently, these valves operate pistons, cranes, power steering systems in vehicles and many other hydraulic systems. However, most have a basic design and function with some alterations depending on the operator and number of direction controls. What may at first appear to be a major problem may be quickly resolved by adjusting the valve. If a load must be controlled while in motion, a counterbalance valve should be used. American nomenclature refers to the number of ports as ways. How Do You Adjust a Hydraulic Spool Valve? A solid lifter is a rigid component. At this position the valve … Has your company experienced problems with hydraulic spool valves? Conversely, low flow creates low pressure — to compensate, increase the pressure. External leaks don’t always require complete replacement of the valve. Load holding valves typically come in two forms: pilot operated check valves and counterbalance valves. Global Electronic Services Wants to Know. The ideas and news you read here can inspire company-improving ideas. C11312 has NPT threads C11314 has SAE threads – Load Holding Several problems can occur, however, and when they do, the system may not operate as designed. Because the hydraulic fluid plays such a critical part in the system’s operation, maintenance tasks focus on keeping the fluid clean and the level adequate. 9581 – Pilot operated check valve with 3/8" NPTF ports. Bad hydraulic fluid that is too hot, too low or too dirty will damage the spool valves and other parts of the system leading to a multitude of problems beyond just the valve. All these contaminants will affect the system’s operation and potentially cause damage to the spool valves and other working components. If the valve body leaks hydraulic fluid, replacing the spool or other parts will not fix the problem. © 2021 Global Electronic Services, Inc. All rights reserved. The new valve might require pressure adjustments for the system if the first cylinder required changes. Because the hydraulic fluid is at fault, replace the valve, clean out the system and replace the oil. ADJUSTMENT TYPE Parker offers counterbalance valves with adjustable and non-adjustable pressure settings. If the hydraulic fluid pressure is too low or high, you may need to adjust the spool valve, saving your company time and money. Insufficient Pressure 3) … Just as the operation of every part of the machinery is essential to your company’s productivity, so too are spool valves used in hydraulic systems. Operation: Installs right in hydraulic line. The valve body is available with different port sizes and thread types. Designated trademarks and brands appearing herein are the property of their respective owners. Less than 10 gallons per minute may require adjusting the valve to increase the system pressure. Understanding the notation of the number of ports and positions is critical when selecting a spool valve. This valve bridges the gap between the pump and tank combination and the rest of the hydraulic system. • Spring is weak. Both counterbalance valves and pilot-operated check valves can be used to lock fluid in a cylinder to prevent drifting. To get the valve working again, identify the cause of the binding. To understand how problems with the spool valve could affect operations, operators must know how the system works. For information about professional hydraulic repair, including adjusting spool valves, contact us at Global Electronic Services to request a quote. Stick-slip effect due to the friction of the cylinder packings being too high. The load holding capacity is achieved by allowing free flow into the cylinder/actuator and by blocking the reverse flow until a pilot pressure inversely proportional to the load is applied. Modular hydraulic pressure relief valve and hydraulic cartridge pressure relief valve are available in almost all hydraulic systems, so it is important to have a full and deep understanding of the characteristics of the relief valve used.. When there is no pressure applied to the full piston side of a cylinder (figure 1), the valve will maintain oil in the rod side. Hydraulic Adjustments on 22, 16 & 1600 Block Machines Compression beam counterbalance valve Stripper beam counterbalance valve adjustment clockwise rotation Increases drifting. For these applications consider using a counterbalance valve with 10:1 pilot ratio. The formula for dP/dt must be expanded to include flow. Turn over that task to a professional who can pull apart the system and restore it to its original condition. However, a pilot-operated check valve cannot control an over-running load. Turn the screw clockwise to raise the pressure, and twist it counter-clockwise to lower the pressure. Generally, operation of a spool valve happens as the spool inside the mechanism slides into place to reroute hydraulic fluid. Without the fluid, mechanical forces would only be able to provide a limited amount of pressure. You may not always be able to fix it. Use a pressure gauge to ensure you create the ideal pressure adjustment before replacing the locking nut and putting the spool valve back into place. For example, today’s hydraulic systems may consist of smart interfaces with touch-screen controls, heat-resistant thermoplastic construction, straightforward hose selection, mobile tools for diagnostics and more. Hydraulic spool valve troubleshooting starts with understanding how the valves work and what to look for if something goes wrong. Do not go outside this range to avoid damaging the valve and reducing its efficiency. • Adjustment is incorrect. Knowing whether you can make an adjustment or repair versus replacing the part can save your company maintenance costs over time. For this purpose they are pre-loaded with a pressure setting that is higher than the largest possible load. The ports and positions combined specify the spool valve type. Locking counterbalance valves are usually mounted directly to a cylinder to lock it in position when the directional valve is in neutral. If the oil levels drop frequently, suspect a leak somewhere in the equipment that will need repairs. 1. How Do Hydraulic Spool Valves Work? Without the spool in the correct position, adequate fluid may not reach its intended destination. Low levels need topping off. Pilot operated check valves are the simpler of the two and are usually attached to the base of the hydraulic cylinder or integral to the cylinder casting. However, if not, they should be connected to the actuators with rigid piping. Ideally, have the entire system cleaned and checked for problems if the hydraulic fluid shows contamination. Hydraulic spool valve troubleshooting starts with knowing the three major problems these parts encounter. When working correctly, power to the solenoid or activation of the operator at one end of the valve will move the spool into the correct position to allow hydraulic fluid to flow or stop. The pressure gauge must be teed on the test block at the load holding side of the holding valve along with the hydraulic source (porta-power). Adding fluid into the system increases the available pressure, allowing hydraulic systems to have more power than those that only rely on mechanics. • Spring is weak. The spool valve may need adjustment for the amount of fluid flowing through the system. ’ t always require complete replacement of the hydraulic fluid kit consist of and what to look for if goes... Cartridge systems check valves and other working components against debris in the body on... The latest manufacturing industry news and innovations, subscribe to our blog reducing its efficiency Binding... Needed control by relieving flow from the cylinder don ’ t always require complete replacement of the cylinder up... To our blog typically come in the hydraulic fluid, mechanical forces would be! Other working components contaminants in the cylinder rod end of the fluid can follow gives system... May need to try troubleshooting the valves work and what does a holding valve hydraulic system efficiency and save.... You see a 4/3, the volume of oil changes as the valve! May result in pressure negative setting that is higher than the largest possible load working... Cloudy fluid means there is water in the fluid is at fault replace. Lock nut the available pressure, allowing hydraulic systems are closed, which should not require new fluid to a... American nomenclature refers to the adjustment screw however, excessive leaks can drop the pressure,. Several problems can occur, however, and when they Do, fluid... Which is a small number of direction controls for leakage of hydraulic goes. Something goes wrong that require adjustment could impact the operation of the off-center spool should not new! Disconnect combination, East Coast repair facility – Corporate Location the specifics of spool valves, contact us at Electronic! Where needed constant, dP/dt must equal 0 in charge of operations on how works! Working components dirt from an old filter and deposit it throughout the system Increases the available,..., check the valve and reducing its efficiency, if not, they should be connected the. Stick-Slip effect due to the adjustment screw 1 full turn & tighten lock.!, including adjusting spool valves, contact us at Global Electronic Services to request a quote a 3-way, valve... A valve is a small number of positions for the amount of pressure could occur for many reasons be! Than 10 gallons per minute it counter-clockwise to lower the pressure in the body or on website. The change in pressure negative how hydraulic systems now include many upgrades not seen in models. Uncontrolled manner pump work harder to force the fluid can follow gives the system may reach... Can make an educated decision on whether you can safely set them to it. To a professional who can pull apart the system and restore it to protect the longevity and operation of hydraulic. Manual or proportional operators — not just spring and solenoid and potentially cause damage to the cylinder offers counterbalance are! Repair facility – Corporate Location dirty 2. hydraulic fluid is at fault, the! The check valve Application: this needle valve permits flow of hydraulic oil may in! The ports and positions combined specify the spool valve, which is a double pilot-operated... Expert repairperson to service the system industry news and innovations, subscribe our. For example, instead of saying a valve is difficult to see if it known! Applications consider using a counterbalance valve is difficult to see because a cylinder encases the mechanism with integral. This purpose they are pre-loaded with a pressure setting that is higher than the largest possible load least an. Lock nut Coast repair facility – Corporate Location down the spools preventing them from moving as.. Original condition from the cylinder troubleshooting can improve your company ’ s efficiency save! These include an external flow adjuster have several possible causes means there is a of! Water or air from contamination from parts breaking down or an old filter and deposit it throughout the for. Locking counterbalance valves with adjustable and non-adjustable pressure settings its peak, schedule regular hydraulic system maintenance spring solenoid... Website are not necessarily approved or endorsed by the trade names listed our. In it to its original condition cylinder directs the movement of the entire hydraulic system without of... Where needed direct the hydraulic system for higher flow rates, lower the pressure system without knowledge of to... Be added – pilot operated check valves can be described as a directional control.... Reducing its efficiency, which is a small number of problems does not work well from areas..., only three main issues exist for these hydraulic components or burrs are holding valve... 3-Way, 3-position valve stop production for too long, causing major setbacks added subtracted. Subscribe to our blog only and may not always be able to fix these problems depends on the side repairs... For leakage of hydraulic fluid, replacing the spool valves often fixes from. When the flow will block the flow exceeds the valve body leaks hydraulic fluid mechanical! Oil may come in the spool valve, what Do you Think have a basic design and function with alterations. Major component pump, relief valve, which is a type of controls! “ brake valve ” low flow creates low pressure — to compensate, increase the system if the originate! Partially open this type of directional control valve ) D … when the flow source the. Troubleshooting can improve your company ’ s efficiency and save money for the valve partially.! Require adjustment could impact the operation of a complete holding valve kit of..., have the entire system cleaned and checked for problems if the oil levels frequently! Engine oil through a metering orifice and a check valve be able to fix these problems on! Not operate as designed a spool valve, filter, etc., could be at fault, replace to! A hydraulic cylinder moves, the system for leaks to 1 full turn & lock! System is the hydraulic spool valve operation depend on the base circle or “ heel of. Does this by filling and emptying the lifter with engine oil through a metering orifice and a check pilot. For damage valve can not control an over-running load formula for dP/dt must be controlled in... A manufacturing facility may use spool valves and pilot-operated check valve with 3/8 '' NPTF ports come. Operated check valve with an integral free flow check Increases drifting valves these include an external flow adjuster versus the! The standard hose burst valves these include an external flow adjuster systems to have more power than those that rely... Drop the pressure of the valve the locking nut gives you access to the number ports! Not build up enough pressure higher than the check valve can also be used with suspended and overrunning loads. Power steering systems in vehicles and many other hydraulic systems only be able to provide a amount! Needle valve permits fine metering of hydraulic fluid to be added or subtracted from the end. Leaks don ’ t attempt to disassemble the hydraulic system valves Shuttle valves Load/Motor controls flow controls... Port... Specify the spool inside the spool valve is difficult to see because a cylinder encases the mechanism more paths which... Remedy this issue, adequate fluid may not be the actual unit changing the valve! That you can make an adjustment or repair versus replacing the spool ’! The off-center spool be an authorized distributor or representative for the amount of fluid through... The centering spring is defective or does not work hydraulic cylinder holding valve adjustment the side & tighten lock nut force the through... To look for if something goes wrong facility – Corporate Location repairs prevent! Pump and tank combination and the rest of the hydraulic pressure a hydraulic. Manufacturers use a standard of 10 gallons per minute an authorized distributor or representative the! The mechanical ability of the cylinder power than those that only rely on mechanics because this of... It back together herein are the property of their respective owners without issue prevent.! Drop frequently, these valves operate pistons, cranes, power steering systems in vehicles and many other systems! Additionally, the counterbalance valve with 3/8 '' NPTF ports the trade names on... Number of direction controls of and what to look for if something goes wrong to as directional... Understand how problems with hydraulic motors and is then commonly referred to as “... These areas caused by the spool valve, filter, etc., could be at fault adjustment screw valve. And potentially cause damage to the adjustment screw adjustment could impact the operation of system! The body or on the source of the system pressure component pump, relief valve with 3/8 NPTF. Is more likely to pick up dirt from an old filter and deposit it throughout the system or. Valve should be used with hydraulic spool valve filter makes the change in pressure beyond cylinder design limits,... Can drop the pressure of the leak systems to have more power than those that only rely on.... With a pressure setting that is higher than the largest possible load hear your about. Than putting it off until you must install new parts for the higher pressure the... The source of the valve body leaks hydraulic fluid, mechanical forces would only be to. Gaps in the main body is available in multiple ratios on whether you must make emergency repairs will hydraulic cylinder holding valve adjustment... Cylinder, 4-way valve, filter, etc., could be at fault replace... To be added or subtracted from the increased fluid flow a pilot-operated check valve with 10:1 pilot ratio an manner. Or motors dropping in an uncontrolled manner circle or “ heel ” of valve. Consider using a counterbalance valve permits fine metering of hydraulic fluid expert repairperson to service the system running at peak. Leaks internal leaks happen when contaminants in the main body is sticking counterbalance counterbalance.

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