Offers to Sell

Daniel is a purchaser of Liebherr branch in Germany. He is responsible for the procurement of hydraulic components. He has done an excellent job some time ago and has been praised by his supervisor for many times. Before the shopping season, he wanted to relax and planned to go on vacation with his family next week. A phone call from the boss disrupted all his plans. A major dealer in Sweden asked for help for a excavator produced by their company within 1 week . His engineer came to the user for routine maintenance and found that there was oil leakage in the hydraulic system. After pressure test, it was found that there was oil leakage in the hydraulic check valve, and 12 excavators had such faults. Daniel hurriedly contacted the American supplier for this hydraulic check valve, and got the reply that it was too cold in Sweden at this time. For such high-frequency operation, even if the hydraulic check valve was replaced, it was estimated that the hydraulic check valve would still leak oil 1 week later. Unless more low temperature resistant sealing rings are used, this will take time to test, but the finishing time is to be determined. Daniel was so helpless, he had to find a new hydraulic valve supplier. Daniel asked several local hydraulic valve manufacturers. They either didn't have time to produce or require over 50pcs MOQ. After knowing these situations, the supervisor asked Daniel to give the dealer a plan that can be implemented within 10 days. Daniel had to cancel the vacation. Daniel thought of AAK HYDRUALIC VALVE who he had contacted for inquiry before. He emailed us to ask whether we can produce the hydraulic check valve for the excavator, which needs to be resistant to low temperature. According to the drawings and working conditions provided by him, we advised that it takes 20 days to customize. All our existing hydraulic check valves are not close to this size. Daniel reiterated the hydraulic check valve needs to be low temperature resistant, and frankly told us what they are currently experiencing. I answered directly that the core lies in the low temperature resistant sealing ring. Daniel felt that maybe AAK could solve this problem. After 18 days, we sent a sample of hydraulic check valve. The test results proved Daniel's feeling. The parameters passed the test and there was no oil leakage at low temperature. The order for 12 hydraulic check valves was also easily confirmed. Daniel's hanging heart can finally be put down. Daniel asked why American hydraulic valve manufacturer needs time "to be determined" to test, and we solved it in 18 days. Why German hydraulic valve manufacturer is unwilling to do this small quantities, but it is OK for AAK hydraulic valve. At the same time, the price of AAK hydraulic valve is cheaper than that made in Germany and that made in the United States. The zero leakage hydraulic valve not only has strict requirements on accuracy, but also strict requirements for the sealing ring due to different media or different scenarios. The sealing ring not only needs to be sealed, but also needs to automatically improve its sealing effect with the increase of the pressure of the hydraulic oil. It also needs not to leak under the harsh working environment such as low temperature or high temperature. 1 year ago, a Russian customer of AAK hydraulic valve put forward the requirement of low temperature resistance. We spent 6 months, experienced 3 failures and 6 seal ring material tests, and innovated a seal ring polymerized with polyurethane elastomer and special rubber from the perspective of friction coefficient. Its low temperature critical point is - 45℃, and its wear resistance, oil resistance, fatigue resistance and vibration resistance can meet high-frequency operation. It was mass produced 1 year ago. AAK delivered 12 hydraulic check valves to his dealer. After all installation and commissioning, they worked continuously for 2 weeks without abnormalities. The Swedish dealer was very satisfied with the high standard after-sales service provided by Liebherr branch. Daniel was very happy. His supervisor gave him special permission to spend more days with his family. AAK zero leakage hydraulic check valve was delivered to Liebherr. You can feel at ease to have a small try. https://www.aakindustry.com/info-detai , l/hydraulic-check-valve-aak117

In July this year, Bowen, an Australian customer, visited 5 hydraulic valve factories before and after, and made samples of hydraulic relief valve with ±1μm inner hole for 3 times, but none of them reached the accuracy requirements. AAK sent samples and met the standard for the 1st time, Bowen finally chose to cooperate with AAK.   The inner hole accuracy is not enough, which is mainly caused by the different built-in equipment of honing machines equipped by many hydraulic valve manufacturers. Conventional honing machines use diamond reamers., Because the main cutting part of the diamond reamer is at the tool head, the tool head wears quickly. After the head is worn, it is very easy to cause the size of the hole bottom to be small, resulting in the poor cylindricity of the whole hole and affecting the accuracy. This is the key to the 5% accuracy error. Many hydraulic valve manufacturers are not aware of this key point.   Bowen, a purchaser from a hydraulic valve company in Australia, has an inquiry for a special hydraulic relief valve, and the inner hole accuracy must be controlled within 1μm. Bowen checked with the original hydraulic valve supplier, and got reply that only the hydraulic valve manufacturer equipped with high-precision honing machine is able to make the hydraulic relief valve with 1μm inner hole accuracy. According to the equipment configuration, Bowen has contacted with more than 10 hydraulic valve manufacturers, determined to visit 5 hydraulic valve manufacturers, and asked 3 powerful factories to sample the hydraulic relief valve. After testing and comparing the samples received from these 3 hydraulic valve factories, all failed to meet the standard. Bowen asked the manufacturer with the highest accuracy to continue to improve the proofing, and there is still ±0.1μm gap. The factory gave up and introduced AAK HYDRAULIC VALVE to him, maybe AAK can do the hydraulic relief valve with ±0.1μm inner hole accuracy.   According to his hydraulic relief valve drawing, we advised that we can send 1pc hydraulic relief valve quality sample after 10 days. 5 days after AAK successfully sent the hydraulic relief valve sample, Bowen informed that the accuracy met the standard. He wanted to know why so many hydraulic valve manufacturers could not achieve ±1μm inner hole hydraulic relief valve, even if the hydraulic valve manufacturers promised to do so and they also have high precision honing machines, but several proofing did not meet the standard. How did AAK hydraulic valve achieve it?   Honing machine is really helpful for the machining of high precision inner hole. Due to different equipment configuration, not every hydraulic valve manufacturer can produce the hydraulic relief valve with ±1μm inner hole accuracy. Different from conventional hydraulic valve manufacturers, AAK adopts sintered diamond tools, equipped with 15 tool position tool magazine and automatic tool change mechanism, which can automatically change tools and add deburring tools. At the same time, it has XY axis worktable, which can automatically change the hole for porous work pieces. At the same time, we have installed an online measurement system in the machine tool to automatically detect the initial diameter of the hole. The system also detects the hole distance, which can automatically alarm abnormalities and 100% eliminate human errors. Bowen's doubts are completely eliminated and asked us to do preparation for material. After he confirms the order with the customer, he will start placing order for this hydraulic overflow valve.   The peers can not guarantee high precision even with the same equipment, but AAK hydraulic valve has always been the leader in precision. You can also have a small try. https://www.aakindustry.com/info-detai , l/hydraulic-relief-valve-aak116

In March this year, the sales manager of Caterpillar received a phone call from a Spanish customer complaining that several excavators produced by their company had small start-up faults. The repairman judged that the hydraulic system leaked oil, which should be caused by the leakage of the hydraulic check valve. The customer asked them to replace the hydraulic check valve as soon as possible. This customer accounts for 40% of Caterpillar's sales. Although it has passed the maintenance period, they must help the customer solve the problem. The original hydraulic valve supplier said that for the hydraulic check valve under this working condition, there can only be no leakage for 2-12 months. In extreme cases, it may be less than 2 months. The customer was disappointed with such a maintenance plan. The boss asked Mark, the purchasing manager, to find a solution satisfying the customer. Mark contacted more than 10 hydraulic valve manufacturers, but did not get a satisfactory reply. He boss urged him to make a new plan twice a day. Mark thought of AAK HYDRAULIC VALVE he had contacted before. Maybe AAK can do some help. He firstly asked us why so many hydraulic valve manufacturers can't achieve 0 leakage for more than 12 months for this style of hydraulic check valve? The hydraulic check valves often use steel ball or metal cone slide valve to contact and compress with the orifice of metal valve seat under the action of spring and fluid pressure to prevent the reverse flow of liquid, but it is difficult to achieve absolute seamless butt joint in the cutting of metal contact surface. Especially under the special working condition of this customer, it is more difficult to avoid leakage. This hydraulic valve manufacturer who has insured for 2 months is already great. Mark thought that AAK HYDRAULIC VALVE could not produce a hydraulic check valve with 0 leakage for more than 1 year, and asked how long we could insure at most. AAK can produce hydraulic check valve with 0 leakage for more than 12 months. If there is no leakage within 1 month, and if subsequent maintenance is in place, the hydraulic check valve can be 0 leakage for 24 months. Mark was surprised at our reply and thought we were joking. Let's talk about it with facts: AAK will send the hydraulic check valve samples within 20 days, you test the hydraulic check valve first, and we will then discuss it after the test. After 15 days, AAK sent the hydraulic check valve samples to Caterpillar. Their engineers conducted internal test first, and there were no abnormalities in many tests. Their after-sales personnel took the samples directly to the customer's construction site for on-site installation and commissioning. It worked continuously for 12 hours, and everything was still normal. The customer was very satisfied with Caterpillar's after-sales service. The boss was also very happy and asked Mark to hurry up to purchase. ark was curious how AAK achieved the hydraulic check valve with 0 leakage for more than 12 months? After receiving the drawings, AAK fine tuned the structure of the hydraulic check valve in the original design without adopting the traditional sealing design. A special soft sealing ring is installed between the outside of the boss of the valve seat and the end face of the valve spool. At the same time, the inner diameter of the soft seal ring is less than the diameter of the boss, rather than the traditional diameter more than that of the boss. When the hydraulic check valve is closed, the soft sealing ring will deform under the action of hydraulic pressure and compress the contact sealing surface between the metal valve spool and the metal valve seat to achieve 100% sealing and ensure 0 leakage. Last week, Mark sent us an inquiry for a new hydraulic valve. Incidentally, he said that since the Spanish customer installed their excavator with AAK hydraulic check valve, everything is normal. The customer has been purchasing other styles of excavators from his company. The boss is more and more appreciative of him now, and assigned all important purchases to him. AAK hydraulic check valve, zero leakage, pay attention to, welcome to have a small try if you need a new and top hydraulic valve manufacturer in Ningbo. https://www.aakindustry.com/info-detail/hy , draulic-check-valve-aak115

Recently, when chatting with several brother customers Felix and Carson, they asked me why the same model of hydraulic valve spool, AAK has higher precision and stronger sensitivity than its peers. This is a good question. I smiled and said: you may not have a comprehensive understanding of AAK hydraulic valve. For all types of hydraulic valve spools, AAK is subject to strict quality control. Under the condition of ensuring that the spool is suitable for the service conditions, we will select the most appropriate tool steel (40Cr, Cr12MoV, 12CrNi3A, 18crniwa and GCr15, etc.) according to the customer's parameter requirements and service scenarios. 6 major processing processes and 6 major parameters are used. This technology has led the industry, we are not satisfied with these static data, but also need dynamic spool. Since the valve spool needs to move in the valve body, the clearance between the valve spool and the valve body should not only ensure good sealing, but also ensure small movement resistance. Therefore, the matching clearance between the valve spool and the valve body is the top priority affecting the use of the valve spool. The following are the tolerances and matching clearance dimensions of the valve spool and the valve body produced in large quantities by AAK in the actual production process: Diameter Valve body tolerance Spool tolerance Minimum clearance Maximum clearance 6mm ±0.006mm ±0.004mm 0.0025mm 0.0125mm >6-12mm ±0.0075mm ±0.005mm 0.0050mm 0.0175mm >12-20mm ±0.01mm ±0.006mm 0.0050mm 0.0233mm >20-25mm ±0.0125mm ±0.0075mm 0.0125mm 0.0325mm When the reciprocating or rotary valve body is matched with the valve spool, we AAK generally use the minimum clearance, but the specific processing parameters should also be determined according to the customer's parameter requirements and use scenarios, so as to ensure that the hydraulic valve does not have any leakage, valve stuck and other unexpected working conditions. During the processing and manufacturing of valve spool, AAK also strictly considers the following aspects, and will check and test each valve spool when necessary, so as to ensure the high quality and reliability of valve spool. 1. Hydraulic power on hydraulic spool 2. Pressure and flow characteristics of hydraulic valve spool 3. Flow coefficient of hydraulic valve spool 4. Leakage of hydraulic valve spool 5. Stability of hydraulic valve spool 6. Vibration of hydraulic valve spool 7. Cavitation of hydraulic valve spool After listening, they admired AAK's rigid attitude and trusted the quality of AAK hydraulic valve more. Using AAK hydraulic valve is reassuring, so AAK has always been their preferred hydraulic valve supplier in China. AAK hydraulic valve sticks to itself and high quality control. You can also have a small try. www.aakindustry.com https://www.aakindustry , .com/info-detail/hydraulic-valve-aak114

Recently, an IP from Germany left a message on the website of hydraulic cartridge valve manufacturer AAK: Can AAK process a hydraulic cartridge valve with the surface finish of the valve cage controlled within Ra0.2μm and with a dimensional accuracy tolerance within 0.5μm? I was a little pleasantly surprised to see this message because: 1. There are not many inquiries from German customers regarding hydraulic cartridge valves, although hydraulic cartridge valve manufacturer AAK has supplied more than 30 countries, this should be the third German customer's inquiry. 2. Not many customers seem to have special requirements for the surface finish of hydraulic cartridge valve cage. After 3 rounds of communication, I learned that Frank is a procurement engineer for hydraulic equipment company. Currently, he is in the trial stage to purchase from hydraulic cartridge valve manufacturers in China and is not very satisfied with the details of Chinese hydraulic cartridge valve manufacturers. Frank consulted 6 hydraulic cartridge valve manufacturers in China, but none of them was unable to guarantee his requirements on the valve cage. The order that Frank tried is a standard part of SUN hydraulic cartridge valves, but the requirements are higher than SUN's. AAK re- optimized the production process and equipped specialized equipment to ensure Frank's requirements for hydraulic cartridge valve cages. At this point, some of our old equipment, old technicians, are put to use. After 20 days, 30 hydraulic cartridge valves were sent out. 1 week after receiving the samples, Frank recognized the hydraulic cartridge valve cage processed by AAK, which met his requirements. We use a TOYODA cylindrical grinder from Japan to process the valve cage for this model. Although this grinder has been in AAK for 10 years and has a somewhat shabby appearance, it is the treasure of our veteran technicians, and we optimize the equipment every 2 years. Its stable grinding accuracy is the biggest advantage, not only high accuracy, but also stability, especially low vibration bed and high-precision feed mechanism, combined with specialized cutting fluid. The machined hydraulic cartridge valve cage has a clear contour and a surface finish of within Ra0.2μm, the dimensional accuracy tolerance is within 0.5μm. Why can the hydraulic cartridge valves provided by AAK meet the requirements of the German customer, while other 6 Chinese hydraulic cartridge valve manufacturers are uncertain? Because: 1. AAK adopts equipment from the Japanese military industry and also upgrades local functions. I don't know which hydraulic cartridge valve manufacturers in Ningbo often have these actions. 2. The experienced technician from hydraulic cartridge valve manufacturer AAK has over 30 years of industry experience. 3. For hydraulic cartridge valves with special requirements, AAK has the ability to re optimize production processes and pay attention to details. AAK hydraulic cartridge valves, meets special requirements, and German customers are purchasing it. You can also try it out. AAK HYDRAULIC CARTRIDGE VALVES (716) 2023-11-26 https://www.aakindustry.com/info , -detail/hydraulic-cartridge-valve- manufacturer , s-aak716

　　Hydraulic cylinders are essential components in many industrial applications. A crucial aspect of their performance and longevity is the selection of the appropriate sealing ring. Here are some key considerations when choosing a sealing ring for your hydraulic cylinder. 　　Understand the Application 　　The first step in selecting the right sealing ring is understanding the specific application of the hydraulic cylinder. Factors such as pressure, temperature, and the type of hydraulic fluid used can significantly impact the performance of the sealing ring. 　　Material Selection 　　Sealing rings are made from a variety of materials, each with its own set of properties. Common materials include polyurethane, nitrile rubber, and fluorocarbon elastomers. The choice of material should be based on the operating conditions of the hydraulic cylinder. 　　Size and Shape 　　The size and shape of the sealing ring are also critical. The ring must fit snugly within the cylinder to prevent leakage. Additionally, the shape of the ring can affect its sealing efficiency. For instance, U-shaped seals are often used for their excellent sealing capabilities under high pressure. 　　Manufacturer Specifications 　　Always refer to the manufacturer’s specifications when selecting a sealing ring. These specifications provide valuable information about the ring’s performance under various conditions. 　　Regular Maintenance 　　Even the best sealing ring will wear out over time. Regular maintenance and inspection can help detect signs of wear and tear early, allowing for timely replacement. 　　In conclusion, selecting the right sealing ring for a hydraulic cylinder involves understanding the application, choosing the right material, considering the size and shape, referring to manufacturer specifications, and performing regular maintenance. By following these steps, you can ensure the optimal performance and longevity of your hydraulic cylinder.

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