Hydraulic Pilot Operated Relief Valve

Richard is a purchaser of ATOS company in Italy. Last September, ATOS received a complaint from a South African customer that the starting pressure of the hydraulic pump was often insufficient recently. The field engineer analyzed that the valve spool spring of the pilot hydraulic relief valve of the hydraulic pump was deformed, resulting in the unstable pressure of the hydraulic system. He tried to replace the pilot hydraulic relief valve to solve the problem. The customer questioned the stability of their equipment because it had been used for less than 1 year. After learning about it, the owner asked Richard to solve the customer complaint as soon as possible and replace this batch of pilot hydraulic relief valves. Richard wondered about the problem with the pilot hydraulic relief valve. This pilot hydraulic relief valve was produced by an American company and was re purchased this time. The original manufacturer replied that this pilot hydraulic relief valve has been produced according to the standard. The strength limit and elastic limit of the piano steel wire used meet the requirements. The problem should be caused by improper use by the user. Of course, he can not tell the owner of such results. The original manufacturer was unwilling to take responsibility. Richard contacted nearly 20 hydraulic valve manufacturers, including AAK hydraulic valve. After several rounds of communication, Richard eliminated half of the hydraulic valve manufacturers, and then asked the shortlisted hydraulic valve manufacturers to send their own ready-made pilot hydraulic relief valves. Their company conducted spring elasticity test. Finally, 5 manufacturers were selected to send samples for the second round according to the drawing size of his pilot hydraulic relief valve and improve the spring elasticity. After communicating with Richard, we learned that the service limit pressure of the hydraulic pump is above 350bar and the service frequency is very high. Although the piano wire spring used by Sun, the original American manufacturer, is advanced, special materials must be used for this special working condition. We started to test the special spring first. Richard has received samples of pilot hydraulic relief valves from other 4 factories, but AAK hasn't sent them yet. Richard pushed us several times and we advised that we are still in testing. Richard may think AAK should not be able to do it. AAK engineers spent 3 weeks, 6 times replacing materials and 9 times proofing, determined the special alloy steel spring as a trial, and sent the pilot hydraulic relief valve 30 days later. We specially asked Richard about the test of the pilot hydraulic relief valves from the other 4 manufacturers. Richard advised that if AAK pilot hydraulic relief valve could not pass the test, he would need a new round of looking for suppliers.

James is the purchasing director of one of our American Hydraulic customers. They are the top 3 in the construction machinery industry in the United States, and their market share is increasing year by year. James is also doing well. In May last year, the MP550-HDD-18 cement delivery pump supplied by their company to a local construction company often failed to reach the rated value for the system pressure during use, and the oil pressure of the hydraulic system can only reach 12MPa. After disassembling the hydraulic system, the engineer found that the joint surface between the conical pilot valve body and the valve seat of the hydraulic relief valve was grinded out with a circle of uneven groove line with a depth of about 1mm for unknown reason. The hydraulic oil flowed back to the oil tank from this groove, and the hydraulic relief valve had no sealing function. The customer wanted Jamesâ??s company to replace the hydraulic relief valve of the same model within 2-3 weeks. If they miss the time, the project progress will be affected. When James purchased this hydraulic relief valve from the original German hydraulic valve supplier again, he was told that they produce this hydraulic relief valve no longer. If he wanted to re-produce it, it would take 35 days and modify the production process and auxiliary equipment, which would require an additional cost of more than 30,000 US dollars. This style of hydraulic relief valve was just purchased by James 2 years ago. When he reported this situation to the president, the president didn't understand why he didn't have an alternative hydraulic valve manufacturer. James realized that the president was unhappy. When he sent the anatomical drawing of this hydraulic relief valve to more than 20 hydraulic valve manufacturers, almost all said that they have no hydraulic relief valve with such structure, James was a little flustered. In March this year, James just purchased a batch of high-precision hydraulic relief valves from AAK. He wanted to see if AAK had a way to solve this thorny problem. When he sent us the pictures of this hydraulic relief valve made in Germany, we asked him to send us the whole complete technical drawings, as well as the use environment and working conditions. The pressure of this hydraulic relief valve is 31.5Mpa and the flow is 200L / min, which is basically consistent with the parameters of the hydraulic relief valve we supplied to them before. However, there is a fatal problem that the internal structure, appearance, shape and size are inconsistent with those of the hydraulic relief valve they purchased in Germany, so it is difficult to install on the transmission line. After learning that the only way is to meet the requirements of the transmission line at the construction site in the United States, AAK engineers designed a new hydraulic system with two pipe joints and an oil plug according

Hydraulic Pilot Operated Relief Valve equivalent to HydraForce RV10-28 passed testing, AAK received mass production order from customer in Turkey 4 months ago in May, we shipped a 2 pcs of test order for a pilot operated relief valve equivalent to HydraForce RV10-28 to a new customer in Turkey. It is a screw-in, cartridge style, pilot operated, relief valve with reverse free flow check valve, intended for use as a pressure limiting device in demanding hydraulic circuits which require fast response, low hysteresis, low leakage, low pressure override and reverse free flow features. This customer tried another hydraulic cartridge valve manufacturer in Ningbo China 1 year ago, but failed due to quality, then they placed the 2 pcs of trial order with AAK this May in despite of AAK price is 15% higher. Last Friday, we were advised by customer that AAK samples passed testing and have been performing very well, and received their mass production order for 500 pcs. The advantages of AAK Hydraulic Pilot Operated Relief Valve E-RV10-28 are: 1. The quality of this valve is benchmarking HydraForce, but price is much cheaper. 2. The service life is 2 times that of domestic hydraulic cartridge valve manufacturers in China Technical parameters of AAK E-RV10-28 Hydraulic Pilot Operated Relief Valve: Max. Operating Pressure: 240 bar (3500 psi) Capacity: 113 lpm (30 gpm) Max. Internal Leakage: 0.50 ml/min (10 drops/min) max. at to 80% of nominal setting Cavity: VC10-2 AAK E-RV10-28 Hydraulic Pilot Operated Relief Valve, benchmarking HydraForce RV10-28, its service life is 2 times that of its domestic peers. You are welcome to give it a try. AAK HYDRAULIC CARTRIDGE VALVES (816) 2024-09-30

According to the financial dept this morning, there was a sample fee for hydraulic pilot-operated relief valves. I knew it was from ROQUET company in Spain. One year ago, Domingo in their company had a hydraulic pilot-operated relief valve that needed AAK to make samples, but was unwilling to pay $2,000 of the sampling fee. The original factory didn't need them to pay, so they chose that factory to produce this hydraulic pilot-operated relief valve. Last week, Domingo came to me again to ask if there was time for sampling and they would pay the sampling fee. After communication, it was learned that the hydraulic pilot-operated relief valves shipped by the original factory were used in the hydraulic power unit. Less than half a year, it was reported for repair by the customer. It is easy to have insufficient power supply of the hydraulic system during the construction process. The after-sales engineer found that the wear of the valve spool of the hydraulic pilot-operated relief valves led to leakage. He had to use the alternative pilot-operated relief valves first and asked Domingo to contact the original manufacturer to solve the problem. The original manufacturer reported that the hydraulic pilot-operated relief valves had not been worn for more than 1 year previously. The working pressure is more than 450bar this time. The domestic hydraulic pilot-operated relief valves can only have a service life of half a year. If you want to find a hydraulic pilot-operated relief valve with a service life of more than 1 year, you can only buy it from HAWE in Germany. They are the best manufacturer of hydraulic pilot-operated relief valves with high pressure resistance in the world, but the price is estimated to be more than twice that of Chinese manufacturers. Domingo was a little helpless and asked the boss whether to purchase directly from HAWE in Germany or continue to look for hydraulic pilot-operated relief valve manufacturers in China. Because the alternative hydraulic pilot-operated relief valves were used on the construction site, they still had a 6-month buffer period. The boss asked him to look for the hydraulic pilot-operated relief valves under high pressure at the same time. At this moment, he thought of AAK. When I told him that the key point of the service life of this hydraulic pilot-operated relief valve is to resist high pressure, AAK has an engineer who has worked in HAWE Shanghai factory for 8 years, our production of high-pressure hydraulic valves is just to benchmark with that of German HAWE company, he seems to realize that perhaps AAK can sample a hydraulic pilot-operated relief valve with a service life of more than 1 year this time. AAK replied that it could complete the samples of 12 hydraulic pilot-operated relief valves within 1 month, and the warranty was more than 1 year. Domingo remitted the sample fee of US$2,000 the next day.

Petrov is an old purchaser of Hydrosila Group in Russia. He cooperates with AAK on some non-standard hydraulic pilot operated relief valves and often discusses some difficulties and complications of hydraulic pilot operated relief valves. In the second half of last year, they needed to purchase a hydraulic pilot operated relief valve to test an agricultural machinery equipment. Due to urgent time, Petrov purchased from a Russian hydraulic relief valve manufacturer, who delivered 30 hydraulic pilot operated relief valves in 30 days. During the test run, the hydraulic pilot operated relief valves screamed at about 1.5MPa before opening, as well as at the start and stop. Petrov contacted the manufacturer of the hydraulic relief valves, and the manufacturer replied that the non-standard customization was completely based on the drawings provided, and the dimensional accuracy also met the requirements. Their engineers independently tested the hydraulic relief valves and found that there was really no abnormality. The boss was dissatisfied with the one week of delay due to the test run and asked Petrov to repurchase the hydraulic pilot operated relief valves. Because the hydraulic relief valve problems encountered before were solved by AAK, Petrov emailed me again. AAK engineer preliminarily judged that there may be problems in the design of the hydraulic pilot operated relief valve according to his fault description, the drawings of the pilot operated relief valve, the working parameters of the hydraulic system of agricultural machinery, and the video of the test machine. Knowing that he still has one month of flexibility, AAK can modify the original design of the hydraulic pilot operated relief valve and send 12 samples within 30 days. Four weeks later, AAK sent 20 samples of hydraulic pilot operated relief valves, which were installed and debugged without screaming, and the hydraulic power unit was started or closed for many times still without screaming. Petrov was surprised that AAK engineer found and solved the problem of hydraulic relief valveS at one time, while the original Russian hydraulic relief valve manufacturer can do nothing? Because the scream of pilot operated relief valve is often generated by high-pressure oil through damping hole or valve port, AAK engineer added inclined hole of valve seat and vibration elimination cavity in the original design. In this way, the dynamic and static characteristics of the hydraulic pilot operated relief valve can be improved, the screaming can be eliminated, the noise can be reduced, and the pressure control accuracy can be improved at the same time. AAK strong engineering team not only has the concept of German HAWE, but also has the experience of Italian Oil Controlï¼?the problem can be found at one time. After the successful test run, Petrov privately told us that the boss was very satisfied that he found a

AAK reduced the shape of the hydraulic relief valve by 35%, allowing the motor installed into the manifold, which can not be achieved by peers Jimmy is from a hydraulic equipment company in the United States. He has cooperated with AAK for more than 2 years and is very sticky about the quality of hydraulic relief valves. At the end of last year, the hydraulic pilot operated relief valve used in the hydraulic unit they developed could only be purchased from local manufacturer because of tight time. Problems were encountered in the hydraulic manifold installation. The existing hydraulic relief valve of the American factory occupied a little position of the motor, resulting in difficulties in the installation of the motor. If the position of the hydraulic relief valve is changed, the manifold oil circuit will be changed and the power supply of the hydraulic system will be affected. The manufacturer of the hydraulic pressure relief valve has no time to adjust the size. Jimmy had to look for other manufacturers of hydraulic pilot operated relief valves. After a week, he found more than 10 local manufacturers of hydraulic relief valves in the United States. Some of them were not willing to customize it due to small quantity, while some gave no reply at all. Jimmy was very helpless. Jimmy thought of AAK Hydraulic Valves in Ningbo and asked how long it would take to produce 10 non-standard hydraulic pilot operated relief valves? I felt his anxiety and asked if he had encountered any difficulties in purchasing hydraulic relief valves. Only then did he tell me the embarrassment he had encountered in domestic manufacturers in the United States. According to the drawings and manifold schematic diagram of the hydraulic pilot operated relief valve provided by him, AAK engineers also suggested that the hydraulic pilot operated relief valve should be redesigned to reduce the length of the hydraulic pressure relief valve by 35%. AAK can send 10 hydraulic pilot operated relief valves within 30 days. Their engineers doubted this innovation, because if the size is reduced by 35%, the load of the hydraulic pilot operated relief valve will be affected. We understood the concerns of their engineers. We would see the result in a month. If AAK hydraulic relief valve can not solve the problem of the manifold installation, we were willing to bear the loss. Jimmy was waiting for the sample of AAK with worry. After the samples were sent out, we soon received email from Jimmy. AAK newly designed hydraulic relief valve was successfully installed into the manifold, and the equipment commissioning was normal. Their engineers were satisfied. They were curious to know how AAK hydraulic pilot operated relief valve was reduced by 35% under the condition of ensuring parameter.

AAK hydraulic relief valves won the PK from more than 30 hydraulic valve manufacturers by using 3 points for quality positioning Madison is from WHITE company in the United States. 1 year ago, he found AAK Hydraulic Valves through Google. He wanted to develop a hydraulic pilot operated relief valve. After 2 rounds of PK, AAK hydraulic valves stood out from more than 30 hydraulic valve manufacturers and received the trial order for 30pcs of hydraulic pilot operated relief valves. The trial order requires that all parameters must be benchmarked with HydraForce. I replied that AAK Hydraulic Valves is the supplier of HydraForce for 9 consecutive years. The quality of HydraForce is the most basic commitment of AAK. 1 month later, 30 samples of hydraulic pilot operated relief valves were sent out, and Madison had no response. I did't have any follow-up. As long as these samples are approved by the customer, the customer will actively feedback the test results and will come to re-purchase this hydraulic pilot operated relief valve. 1 year later, that is, yesterday, I received Madison's e-mail. I knew that it must be the re-order before I did not read the email. Madison said that after 1 year's use, AAK hydraulic pilot operated relief valve has reached the standard, and 800 more hydraulic pilot operated relief valves are needed. Madison also specifically mentioned that AAK hydraulic pilot operated relief valve is completely comparable to HydraForce in quality and function, and the internal leakage control is 20% higher than that of HydraForce, and the performance is more than 2 million times. In the past year, AAK Hydraulic Valve was the most satisfied hydraulic relief valve manufacturer of their entire technical team. Not only did the manufacturing quality match the standard of HydraHorce, but also the price was about 30% cheaper. I know that there are many hydraulic valve manufacturers in Ningbo, but there are not many hydraulic valve manufacturers such as AAK that insist on "high quality, excellent function and strong performance", perhaps not more than 3. In my early years, I understood the importance of choice from the Scrolls. One's greatest strength is the power of choice. Since its inception, AAK has made a quality positioning for hydraulic valves, which makes AAK become one of the suppliers of six top 500 enterprises in the world. AAK's strength mainly depends on 3 important points: human, machine and material: 1. AAK engineers have more than 20 years of industry experience, not only have strong design and R & D capabilities, but also know the details of each processing of products. 2. In terms of finishing equipment, AAK has the NP520X-F full-automatic universal grinder of Japan Long Island, which can achieve surface of the processed valve spool is like a mirror, and the precision control is excellent.

used imported tools to solve the problem of rough inner hole of hydraulic relief valve. David came back after being cheated elsewhere Half a year ago, , an customer, sent an inquiry to about 500 pilot operated hydraulic relief valves. This hydraulic relief valve is difficult to process the inner hole. Our cost accounting department gave a reasonable price. 3 days later, informed that the price of the hydraulic relief valve was 16% higher than that of other manufacturers and he could only place the order with other hydraulic relief valve manufacturer. As far as I know, there are not many manufacturers who can make this hydraulic relief valve. The price provided by this time should be very cost-effective. As is our old customer, we never quote prices indiscriminately. I always believe that it is also a sign of dishonesty to quote prices indiscriminately. Last month, asked again whether the hydraulic relief valve quoted last year could maintain its original price. I asked him curiously, hasn't this hydraulic relief valve placed an order yet truthfully told us that last time, the pilot operated hydraulic relief valves purchased in another manufacturer were reported by the users that the stability was poor and the valve was often stuck. They decided to get replacements. contacted the original manufacturer of the hydraulic relief valves, but the manufacturer was unwilling to offer replacements. Because there were too many complaints, David did not dare to ask the original manufacturer to re produce, so he emailed . was very cautious this time. He specially sent us 5 samples of hydraulic relief valves from the original manufacturer. After receiving and checking, we found that the inner hole of the hydraulic relief valve has a taper, the processing size is not accurate, and the surface roughness Ra is as high as 1.6m. The root cause of these problems is that the processing tool rotates improperly, which also shows that the original manufacturer is not good at processing this special inner hole. No wonder there are so many complaints. It is wise for to change the factory. was satisfied with our diagnosis of this hydraulic relief valve and asked us to make samples as soon as possible. 1 week later, sent the samples of hydraulic relief valve, and approved our samples at one time. They specially compared hydraulic relief valves with that of the original manufacturer. Their engineers admired the inner hole processing of , which not only has no taper, but also has more than twice the accuracy of the original manufacturer. For the special inner hole of this pilot hydraulic relief valve, adopts CBN cubic boron nitride cutter from to replace the conventional ceramic cutter. Most hydraulic relief valve manufacturers dare not use this cutter, which is not only costly,