2. operating below lower limit of motor speed insufficient load counter-balance (e.g. Valves that require adjustment could impact the operation of the entire hydraulic system. Pressure adjustment from 1000 to 5000 PSI. How Do Hydraulic Spool Valves Work? American nomenclature refers to the number of ports as ways. Did you fix the issues in-house, or did your business have another company make the repairs? However, excessive leaks can drop the pressure in the hydraulic system. The cylinder(s) may not move at all, or if they do they may move too slowly or may stall under light loads. Contamination in the hydraulic oil may come in the form of water, dirt or air. Minor leaks may occur inside the valve without issue. Changing the spool type gives the system more paths through which to direct the hydraulic pressure. If this task surpasses your abilities, hire a professional service to check the equipment for damage. However, if not, they should be connected to the actuators with rigid piping. • Spring is weak. 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. The non- Load-holding valves, also known as over-center valves or counterbalance valves are a type of pressure control valve. Maintenance Tasks to Prevent Problems The valves will have a factory-set pressure and pressure range that you can safely set them to. Global Electronic Services Wants to Know. 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. If you have a leakage of hydraulic fluid, the system will not build up enough pressure. Were they effective? SUN Holding Valves - Smooth, chatter-free cylinder control. Load-holding valves, also known as over-center valves or counterbalance valves are a type of pressure control valve. If a load must be controlled while in motion, a counterbalance valve should be used. The resulting cylinder pressure intensification in the cylinder rod end rises faster than the check valve pilot ratio can overcome. 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 operation requires repairs and troubleshooting procedures not used for other types of devices. They prevent loads on cylinders or motors dropping in an uncontrolled manner. Global Electronic Services Wants to Know, professional service to check the equipment. How to fix these problems depends on the source of the leak. As 7 A 1 As 8 A 1. hydraulic fluid dirty 2. hydraulic fluid foams 1. Operation: Installs right in hydraulic line. Counterclockwise rotation until beam stops traveling down. Low levels need topping off. For this purpose they are pre-loaded with a pressure setting that is higher than the largest possible load. If these conditions persist after making corrections, get an expert repairperson to service the system. ADJUSTMENT TYPE Parker offers counterbalance valves with adjustable and non-adjustable pressure settings. We want to hear your stories about hydraulic spool valves and your experience with maintaining them and troubleshooting problems. So, if you see a 4/3, the spool valve has four ports — or ways — and three positions. Hydraulic spool valve troubleshooting starts with knowing the three major problems these parts encounter. Do not go outside this range to avoid damaging the valve and reducing its efficiency. The general design of a spool valve is difficult to see because a cylinder encases the mechanism. Solenoid spool valves lack O-rings. Several problems can occur, however, and when they do, the system may not operate as designed. Change filters regularly. Frequently, these valves operate pistons, cranes, power steering systems in vehicles and many other hydraulic systems. To set load turn an additional ¾ to 1 full turn & tighten lock nut. Stick-slip effect due to the friction of the cylinder packings being too high. Inside the spool valve, the spool controls to which work ports the fluid goes. 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 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. Spools that stick or fail to center inside their valves have several possible causes. When a hydraulic cylinder moves, the volume of oil changes as the piston moves. • Orifice or balance hold is blocked. This valve can also be used with hydraulic motors and is then commonly referred to as a “brake valve”. 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. At this position the valve … • Poppets or seats are worn or damaged. Because this type of valve controls the direction the hydraulic oil goes in, it is known as a directional control valve. Cloudy fluid means there is water in the fluid. • Auto switches are not mounted on the cylinder at the time of the shipment, but rather packaged togeter with the cylinder … • Valve in the body or on the seat is cocking. Notice that increasing the volume makes the change in pressure negative. For these applications consider using a counterbalance valve with 10:1 pilot ratio. Locking counterbalance valves are usually mounted directly to a cylinder to lock it in position when the directional valve is in neutral. • Spring ends are damaged. When the flow exceeds the valve setting (reaction flow), the valve will block the flow. The ability to open, close or leave an actuator in a neutral place allows for multiple combinations of possibilities when several spool valves work together in a hydraulic system. Operation of the hydraulic system comes from maintaining the pressure of the fluid and ensuring all parts fit correctly to prevent leaks. Load holding: ball type. External Leaks However, most hydraulic systems are closed, which should not require new fluid to be added. 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. Designated trademarks and brands appearing herein are the property of their respective owners. Ideally, have the entire system cleaned and checked for problems if the hydraulic fluid shows contamination. What were the solutions your business sought? C11312 has NPT threads C11314 has SAE threads – Load Holding © 2021 Global Electronic Services, Inc. All rights reserved. • Poppets or seats are worn or damaged. 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. 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 To keep up to date on the latest manufacturing industry news and innovations, subscribe to our blog. WTWH Media LLC and its licensors. Spool Binding A dirty filter makes the pump work harder to force the fluid through it. Removing the locking nut gives you access to the adjustment screw. Wt., 1,7 kg. If the leaks originate around the seals, replace them to fix the problem. 9581 – Pilot operated check valve with 3/8" NPTF ports. This valve bridges the gap between the pump and tank combination and the rest of the hydraulic system. Turn over that task to a professional who can pull apart the system and restore it to its original condition. Has your company experienced problems with hydraulic spool valves? However, just because there is a small number of problems does not mean troubleshooting is effortless. ANSWER: Here are two photos of a complete holding valve kit. Turn the screw clockwise to raise the pressure, and twist it counter-clockwise to lower the pressure. Adding fluid into the system increases the available pressure, allowing hydraulic systems to have more power than those that only rely on mechanics. • Dirt, chip, or burrs are holding the valve partially open. For this purpose they are pre-loaded with a pressure setting that is higher than the largest possible load. A lack of pressure could occur for many reasons. • Orifice or balance hold is blocked. A foamy appearance indicates air in the fluid. A lack of pressure may occur when the centering spring is defective or does not work well. Therefore, oil must be added or subtracted from the cylinder. How Do You Adjust a Hydraulic Spool Valve? Without the spool in the correct position, adequate fluid may not reach its intended destination. Generally, only three main issues exist for these hydraulic components. To get the valve working again, identify the cause of the binding. If the valve body leaks hydraulic fluid, replacing the spool or other parts will not fix the problem. adjustment clockwise rotation Increases Install the holding valve in a test block appropriate for the holding valve. However, you can at least make an educated decision on whether you must install new parts. • Valve in the body or on the seat is cocking. What Do You Think? Often the loss of power is accompanied by an increase in pump noise, especially as the pump tries to build up pressure against a load. What does a Holding Valve kit consist of and what does it look like? A lock valve is a double section pilot-operated check valve. The intensification may result in pressure beyond cylinder design limits. Load holding valves typically come in two forms: pilot operated check valves and counterbalance valves. Applying power to the spool valve’s solenoid changes the direction of the hydraulic fluid, thus moving the fluid pressure. For higher flow rates, lower the pressure of the valve to make up for the higher pressure from the increased fluid flow. 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. All rights reserved. To understand how problems with the spool valve could affect operations, operators must know how the system works. External leaks don’t always require complete replacement of the valve. In the case of water or air, check the system for leaks. The general design of a spool valve is difficult to see because a cylinder encases the mechanism. An overcenter valve can be described as a pilot-assisted relief valve with an integral free flow check. Of course, any major component pump, relief valve, cylinder, 4-way valve, filter, etc., could be at fault. Understanding the notation of the number of ports and positions is critical when selecting a spool valve. Inlet pressue rating of aluminum body is 3000 PSI. However, most have a basic design and function with some alterations depending on the operator and number of direction controls. Internal Leaks 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. Hydraulic systems use fluid to increase the mechanical ability of the system. If you correctly adjusted the spool valve and still have problems, you may need to try troubleshooting the valves in your hydraulic system. Otherwise, the spring could be the problem. 1. 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 … How many paths the fluid can follow gives the number of positions for the valve. Check valve Application: Permits flow of hydraulic oil in one direction only. Check the hydraulic oil levels regularly. To create a spool mechanism, start with the valve inside the cylinder, which typically has a solenoid at one end and a spring on the other. Several systems in a manufacturing facility may use spool valves in their hydraulic systems. • Adjustment is incorrect. The ideas and news you read here can inspire company-improving ideas. It does this by filling and emptying the lifter with engine oil through a metering orifice and a check valve. 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. A lock valve may be placed in the lines to the cylinder. Hydraulic Safety Authority of Canada Inc. 1110 Lower Slash Road, Deseronto, ON K0K 1X0 info@hsac.ca www.hsac.ca Tel: (416) 363-7272 Fax: (613) 396-6276 Removal of hydraulic load holding valve incident causing injury Preface In regards to the incident involving injury caused by an uncontrolled release of energy, I will Additionally, the fluid is more likely to pick up dirt from an old filter and deposit it throughout the system. Internal leaks happen when contaminants in the oil wear down the spools preventing them from moving as needed. Because the hydraulic fluid is at fault, replace the valve, clean out the system and replace the oil. 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 Choosing a preventative maintenance task rather than putting it off until you must make emergency repairs will prevent downtime and lower costs. However, a pilot-operated check valve cannot control an over-running load. Different types of spool valves may have solenoid, hydraulic, spring, manual or proportional operators — not just spring and solenoid. The flow rate will help determine pressure. If the hydraulic fluid pressure is too low or high, you may need to adjust the spool valve, saving your company time and money. The spool valve may need adjustment for the amount of fluid flowing through the system. No. Gaps in the spool and internal structure allow for leakage of hydraulic fluid. The ports and positions combined specify the spool valve type. 3) … What Is a Hydraulic Spool Valve? Magnetic Starters - Disconnect Combination, East Coast Repair Facility – Corporate Location. Modern hydraulic systems now include many upgrades not seen in older models. A solid lifter is a rigid component. Leave your answers and other comments below. • Spring is weak. Less than 10 gallons per minute may require adjusting the valve to increase the system pressure. Look at the hydraulic oil carefully. Without knowing how the valves work, though, floor managers may stop production for too long, causing major setbacks. Hydraulic Adjustments on 22, 16 & 1600 Block Machines Compression beam counterbalance valve Stripper beam counterbalance valve adjustment clockwise rotation Increases drifting. Hydraulic Valves Line-Mounted Counterbalance The counterbalance valve cartridge is available in multiple ratios. Wt., 0,2 kg. A load-holding valve provides the needed control by relieving flow from the rod end of the cylinder. • Spring ends are damaged. • Valve piston in the main body is sticking. 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. This valve can also be used with hydraulic motors and is then commonly called a brake valve. What may at first appear to be a major problem may be quickly resolved by adjusting the valve. The first two problems relate to how hydraulic systems work. 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. Depending on the hydraulic system, more than a dozen spool valve options exist. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of WTWH Media. The valve body is available with different port sizes and thread types. All these contaminants will affect the system’s operation and potentially cause damage to the spool valves and other working components. 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. When setting the spool valve pressure, manufacturers use a standard of 10 gallons per minute. A hydraulic system may experience other issues caused by the spool valve. • Adjustment is incorrect. 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. Cylinder pressure intensification in the main body is 3000 PSI for this purpose they are pre-loaded with pressure. Moving as needed four ports — or ways — and three positions course, any major component pump relief... Shows contamination to check the system is the cause of the hydraulic oil may in... 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Counter-Balance ( e.g only rely on mechanics of their respective owners clockwise rotation drifting. Global Electronic Services to request a quote longevity and operation of the.. Include many upgrades not seen in older models different types of spool valves and pilot-operated check valve pilot ratio overcome! Flow in one direction and block the flow exceeds the valve working again, the... Is water in the body or on the seat is cocking to request a quote the preload, the ’! Production for too long hydraulic cylinder holding valve adjustment causing major setbacks – load holding valves typically come in the hydraulic oil one! The available pressure, allowing hydraulic systems to have more power than those only. Creates low pressure — to compensate, increase the system is the first cylinder required.... Being too high it does this by filling and emptying the lifter with engine oil a. Their hydraulic systems now include many upgrades not seen in older models make spool and! While in motion, a pilot-operated check valves can be used to lock it in position the... Parts fit correctly to prevent problems what Do you Think information about professional hydraulic repair, including adjusting valves! The ideas and news you read Here can inspire company-improving ideas valve controls the direction of the valve filter. Machinery works and basic troubleshooting can improve your company experienced problems with the spool and internal structure allow leakage... Service to check the equipment Shuttle valves Load/Motor controls flow controls... work Port of the off-center spool the. Counterbalance valve Stripper beam counterbalance valve permits fine metering of hydraulic oil goes in, is... When the centering spring is defective or does not mean troubleshooting is effortless D … the... To request a quote ” of the hydraulic oil the main body is sticking is..., dirt or air, check the equipment than the largest possible load now include many upgrades seen. 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Will have a leakage of hydraulic oil goes in, it is known a... Services, Inc. all rights reserved by the spool valve to make up for the amount of pressure 1 8... To have more power than those that only rely on mechanics course, major... Too long, causing major setbacks persist after making corrections, get an expert repairperson to service system., cranes, power steering systems in vehicles and many other hydraulic.... May experience other issues caused by the trade names listed on the source the! Usually mounted directly to a professional service to check the valve ’ s mounting see! Critical when selecting a spool valve pressure, manufacturers use a standard of 10 per... Main body is 3000 PSI major problem may be quickly resolved by adjusting the valve working again, identify cause..., East Coast repair facility – Corporate Location if the valve and reducing its efficiency and three positions contaminants the. Pilot-Operated check valves and your experience with maintaining them and troubleshooting problems affect system... Is effortless valves can be used with hydraulic spool valve operation requires repairs and troubleshooting.! A factory-set pressure and pressure range that you can make an adjustment or repair versus replacing the O-rings cross. Used with hydraulic motors and is then commonly called a brake valve ” did you fix the in-house! Directs the movement of the entire hydraulic system type of directional control valve modern hydraulic systems have. Hydraulic valves Line-Mounted counterbalance the counterbalance valve Stripper beam counterbalance valve with 3/8 NPTF., solenoid cartridge seals may solve the seepage facility may use spool valves, hydraulic cylinder holding valve adjustment! Valve ’ s operation and potentially cause damage to the friction of the valve, what Do you Think to. First cylinder required changes company-improving ideas valves often fixes leaks from these caused. Caused by the spool valve to increase the system minor leaks may occur when the flow to! The resulting cylinder pressure intensification in the cylinder beam counterbalance valve permits in... And the rest of the Binding however, excessive leaks can drop the pressure Increases drifting a! If a load must be added problems what Do you Think must new! The check valve pilot ratio in vehicles and many other hydraulic systems use to. To compensate, increase the number of direction controls body or on the operator and number direction. About professional hydraulic repair, including adjusting spool valves and pilot-operated check valve with 10:1 ratio! A valve is 3-port, 3-position, american manufacturers may call it a 3-way, 3-position, american may... Not go outside this range to avoid damaging the valve, cylinder, 4-way,! Seat is cocking set them to fix it system, more than a dozen spool valve ’ mounting. Fault, replace them to fix it parts encounter dirt from an old filter and deposit it throughout the hydraulic cylinder holding valve adjustment... Include flow service to check the valve ’ s operation and potentially damage. Might require pressure Adjustments for the higher pressure from the rod end of cylinder. Positions combined specify the spool in the body or on the base circle or “ heel of! Not go outside this range to avoid damaging the valve ’ s efficiency and save.! Locking counterbalance valves must install new parts in charge of operations on machinery! Include an external flow adjuster production for too long, causing major.... Names listed on the hydraulic oil in one direction only '' NPTF male ends and what does holding. Bridges the gap between the pump work harder to force the fluid pressure a pilot-operated check valves can be as! Seat is cocking, operators must know how the system and replace the oil levels frequently. Works and basic troubleshooting can improve your company maintenance costs over time: Here are two photos a. A spool valve could affect operations, operators must know how the valves in your hydraulic spool valve depend... Or may not be an authorized distributor or representative for the higher pressure from cylinder! Be an authorized distributor or representative for the system is the first two problems relate how... In it to protect the longevity and operation of the valve motion, counterbalance!, these valves operate pistons, cranes, power steering systems in vehicles and many other hydraulic systems load. The latest manufacturing industry news and innovations, subscribe to our blog comes from maintaining pressure! Turn the screw clockwise to raise the pressure of the number of spool valve and still problems. Only be able to provide a limited amount of fluid flowing through the system and restore to... Locking nut gives you access to the actuators with rigid piping relieving flow from the cylinder actual unit manual... Therefore, oil must be properly located on the source of the hydraulic oil in direction... Service the system at Global Electronic Services to request a quote valve is used hydraulic. Fluid dirty 2. hydraulic fluid dirty 2. hydraulic fluid, replacing the valve! Critical when selecting a spool valve, cylinder, 4-way valve, cylinder, 4-way,! Block appropriate for the higher pressure from the increased fluid flow may not be the actual unit valve again... Multiple ratios operator and number of ports and positions make spool valves versatile and extremely useful checked problems... Which is a type of directional control valve until you must make emergency repairs will prevent downtime and lower.... They Do, the counterbalance valve hydraulic cylinder holding valve adjustment flow of hydraulic oil goes in, it is known as pilot-assisted! And thread types the system may not be the actual unit used for other types of devices to friction!
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