Call Customer Service at (586) 800-0875. 
All hydraulic system relief valves work by balancing the hydraulic force with an adjustable spring force. 
All manufacturers names, numbers, and descriptions are used for reference purposes only. Fluid Power World is written by engineers for engineers engaged in designing machines and or equipment in Off-Highway, Oil & Gas, Mining, Packaging, Industrial Applications, Agriculture, Construction, Forestry, Medical and Material Handling.
In some cases, technicians forget to recalibrate pressure relief valves for the systems new normal operating pressure. Its important to learn the signs of a possible failure in order to quickly solve the problem and keep your facility safe. If a relief valve is set but is releasing pressure before a system reaches maximum pressure, or if its constantly leaking or chattering, something may be wrong with the system. 
Start the equipment and activate the hydraulic circuit. |, If the valve was calibrated to the wrong set pressure, Pressure relief valves and safety relief valves, article from the Journal of Emerging Technology and Advanced Engineering. In the case of a loose fit or broken spring, replacement is a must. 
2022 Hydraulic Parts Source, All Rights Reserved. This is part of the reason that valve testing and maintenance is so important.
Your valve technicians can go in and adjust the valves set pressure to address this issue.
If that doesnt solve the problem, and the rest of your system is working properly, then your pressure relief valve likely needs to be changed. After years of service, the valve could be damaged or eroded from environmental dirt and debris, which block the valve from fully closing. If your system is above pressure and your pressure relief valves have not released, this could be a relief valve failure. You'll get a quote in 30 minutes or less. Pressure relief valves and safety relief valvesare what keep a facility safe. If your system builds up more than safe maximum pressure, safety relief valves open up to let off additional pressure, keeping your facility, your employees, and your equipment safe. When your system cannot reach pressure, you will likely experience production slowdown or downtime. Remove the JIC plugs and caps, and reconnect any hoses removed in Step 2. Locate the relief valve for the circuit. The pressure reading on the gauge should be close to zero. In most cases, It is important to look at the why behind pressure relief valve failure, rather than just replacing the valve in question. This can cause chattering, where the valve isnt all the way open, but is opening and closing rapidly, stopping it from properly doing its job. Shut down the machinery and allow the pressure to bleed off. Complete the form below & we'll have a quote to you in 30 minutes or less. Need help? Pressure valve leakage is a little more complicated to troubleshoot, as there are many possible causes. A properly adjusted valve will enable the system to operate correctly, while controlling the amount of heat generated. While the other two signs appear obvious, this last sign is more noticeable when youre directly inspecting your pressure relief valves. If your system is not reaching the right pressure, it could be a sign of pressure relief valve failure. One of the first things youll learn about Cory in his professional life is his belief that customer relationships are everything.. Properly setting, inspecting, and maintaining pressure relief valves in a hydraulic system is key to operating a safe facility. He is a sports fan who also enjoys golfing in his free time. The valves also limit the hydraulic systems maximum output force. Call (586) 800-0875. You will need to ensure that the valves are set to the correct set pressure. Electro-Pneumatic Regulator & Flow Controller Design. Adjust the relief valve by turning the adjuster clockwise until the reading on the gauge builds to the pressure called for on the machine drawings. 41350 Production Drive Harrison Township, MI 48045, Toll Free: (888) 477-7278 Toll Free Fax: (888) 477-7279, Phone: (586) 463-3166 Fax: (586) 463-3398. If there is no port, use an adapter to install the gauge. Loosen the pressure relief valve adjustment as far as it will go. by Cory Gilbert | Feb 23, 2021 | Fluid Power Technical Topics. The valve does not function properly within your system, which means its not protecting your facility, your employees, or your equipment in the event that there is a larger problem. This deadheads the hydraulic circuit in order to isolate the system to just the pump and relief valve. Cory has a whatever it takes attitude and helps maintain a customer service team that is accountable, honest, efficient, and hard-working. It is not to be implied that any item is the product of these manufacturers. Thisarticle from the Journal of Emerging Technology and Advanced Engineeringprovides a helpful flowchart outlining the troubleshooting procedure to take in the event that you experience pressure relief valve failure. Whenever the relief valve opens in response to a predetermined pressure, it releases heat. In some cases, this could be fixable. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of WTWH Media. All rights reserved. Capping off or plugging unused hoses and fittings prevents the loss of hydraulic fluid and system contamination. Most equipment will have a port already installed for this purpose. This can happen with changes to your facilitys plant design. Hydraulic relief valves limit system pressure to protect components.
A quality inline safety relief valve testing system can help you here. Using any method of capping or plugging a hose other than with the proper JIC plug or cap is unsafe and should never be attempted. With a personal goal of taking care of the customer at all costs, CEO Cory Gilbert has been a driving force behind the high level of customer satisfaction at Hydraulic Parts Source since 2009. Below we describe the steps involved in setting hydraulic system relief valves and the signs that a valve needs replacing. Connect a pressure gauge between the relief valve and the pump. Contaminants, like dirt, lint, rust, sludge, or even the misalignment of the valve can cause the pressure relief valve to stick. Tighten the adjuster lock nut securely, being careful not to disturb the valve setting. This is what is known as the valve cracking pressure, which is the pressure at which the relief valve starts to open. A failing pressure relief valve is most often a symptom of a greater problem. It could be the valve, it could be that misalignment is causing a failure to reseat after a correct opening, or it could be that there is more pressure in your system than the valves set pressure. The relief valve will normally have a locking hex nut and an Allen head adjuster or hand wheel adjuster. Cap off the hose and valve with the correct JIC caps or plugs. Locate and remove the hydraulic hose on the system side of the relief valve. If youve been testing your valves regularly, its likely theres something else in your system to blame. Start the machinery, and test the relief valve by starting the circuit. That said, pressure relief valves can and do fail. Consult and review the machine drawings to figure out which circuit needs adjustment. Relief valves are always piped in parallel to the pump and are normally as close to the pump as possible. Do not cap off the return or tank side of the relief valve. Outside of work, he enjoys spending time with friends and family.
Cory is a graduate of Alma College with a degree in Finance and Marketing. Here are 3 signs of pressure relief valve failure to watch out for. WTWH Media LLC and its licensors. At this point, you might see that your system is above pressure, or you will notice other pressure relief valves in the system releasing to make up for this valves malfunction.
The pressure reading on the circuit should not rise above the pressure that was set on the relief valve. Fluid Power World covers pneumatics, mobile hydraulics and industrial hydraulics. Need immediate help? If the valve was calibrated to the wrong set pressure, it could simply be releasing early. Leaking valves are a problem, and can contribute to slower, less efficient production, but they can be more difficult to notice, as their effect on the entire system can be much smaller. If your pressure relief valve has no pressure, it is likelythat the balance hole is plugged, the spring is broken, or the valve has a loose fit. If valves are not set properly or monitored carefully, the hydraulic system can malfunction and suffer damage. A properly maintainedpressure relief valvecan stay in service for up to 30 years.
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