Hydraulic System Pressure Relief Valve Suppliers and Manufacturers

The angle error of inner cone of AAK hydraulic relief valve sleeve is controlled within ± 0.8 , and the minimum axial grinding tolerance of sealing circle is 0.07m. At the same time, it is inspected by three coordinate measuring instrument to ensure that the hydraulic relief valve is 100% leak free. After comparing more than 10 hydraulic valve manufacturers, Backhaus determined that AAK hydraulic valve is the most reliable hydraulic relief valve manufacturer. At present, in the manufacturing process of hydraulic relief valve, when grinding the conical surface inside the valve, most hydraulic valve manufacturers just let the operator judges the feed rate, angle control and grinding tolerance by experience completely. There is no grinding amount detection link, and there is no precision detection of each part in the valve. When this type of common quality hydraulic relief valve is used on equipment with high requirements, troubles will come out. Backhaus is a purchaser of a German hydraulic pump company for less than a year. In the first half of the year, a batch of hydraulic pumps of their company were complained by customers. After the hydraulic pump is started, the system pressure begins to lose stability and there is pressure drift. The engineer judged that there was a problem with the hydraulic relief valve. After disassembly, it was found that there was a gap between the valve sleeve and valve spool of the hydraulic relief valve. After measurement, it was found that the error of the cone angle in the valve sleeve of the hydraulic relief valve was too big and caused leakage of the hydraulic relief valve. The only solution is to replace the hydraulic relief valve. It is estimated that 30% of hydraulic relief valves need to be replaced. The owner asked Backhaus to replenish the goods as soon as possible and solve the customer complaints. Backhaus contacted the original manufacturer of the hydraulic relief valve. The manufacturer was willing to replenish. Backhaus thought it would be all right after replacing the hydraulic relief valve. A month later, the customer complained again, which is still the same problem. This shows that the quality of the hydraulic relief valve from the old manufacturer is not trustworthy, and it is urgent to replace the hydraulic relief valve supplier. Backhaus contacted more than 10 hydraulic relief valve manufacturers, including AAK hydraulic valve. The hydraulic relief valve is required to be 100% leak free. AAK hydraulic valve and other 3 manufacturers are required to send samples for testing according to his hydraulic relief valve drawings and working conditions. A month later, Backhaus asked us about the production time of replenishing 30% hydraulic relief valve. It should be that AAK hydraulic relief valve has been recognized by the customer.

On Monday afternoon, I received an email from Tony. Tony is a purchasing manager of CASAPPA in Italian, mainly responsible for the purchasing of hydraulic pump components, and the work has been very smooth. Last month, they received a complaint from the largest customer that the pressure at the outlet of the hydraulic pump sometimes rises by itself, resulting in unstable operation of the equipment. The customer's site engineer couldn't solve it and turned to CASAPPA for after-sales service. Although the warranty period has expired, they still need to help customer solve the problem. Their engineers tested various parameters of the hydraulic pump. After comprehensive analysis, they were still uncertain about the root cause, but they suspected that the hydraulic pressure relief valve in the pump is faulty. The engineer asked Tony to contact the original supplier of the hydraulic pressure relief valve and ask him to send a sample of the hydraulic pressure relief valve for replacement and test. It is a local hydraulic valve manufacturer and they still have samples in stock. After receiving samples and commissioning, the engineer's suspicion was proved to be correct. After replacing the hydraulic pressure relief valve, the hydraulic pump worked normally. Tony asked the original hydraulic valve manufacturer to urgently replenish 30 hydraulic pressure relief valves to solve this complaint. The manufacturer said that the shipment has passed the two-year warranty period. At present, there are only 3 samples in stock. The remaining quantity needs to wait in production schedule for production, and can only be delivered after 3 months. If offering this plan to the big customer, Tony would be scolded by the boss. He thought of AAK, because the hydraulic valve failed last year, which was also solved by AAK. Tony established a business relationship with us last October. Now we are also friends besides business. We often discuss the knowledge related to hydraulic valves. His email on Monday is just to ask for help on this hydraulic pressure relief valve. After knowing these conditions, I asked him to send us samples of those faulty hydraulic pressure relief valves, and provide us the drawings of this hydraulic pressure relief valve, noting those special requirements. After receiving and disassembling the samples from Tony, we found that the main valve spool of the hydraulic pressure relief valve was too loose and had increased leakage, then the pressure at the oil outlet increased. The problem should be caused by high-frequency wear or insufficient accuracy of the original shipped hydraulic pressure relief valve. The engineer of CASAPPA asked us to reply why it was determined that it was the problem of the valve spool?

On Monday afternoon, I received an email from Tony. Tony is a purchasing manager of CASAPPA in Italian, mainly responsible for the purchasing of hydraulic pump components, and the work has been very smooth. Last month, they received a complaint from the largest customer that the pressure at the outlet of the hydraulic pump sometimes rises by itself, resulting in unstable operation of the equipment. The customer's site engineer couldn't solve it and turned to CASAPPA for after-sales service. Although the warranty period has expired, they still need to help customer solve the problem. Their engineers tested various parameters of the hydraulic pump. After comprehensive analysis, they were still uncertain about the root cause, but they suspected that the hydraulic pressure relief valve in the pump is faulty. The engineer asked Tony to contact the original supplier of the hydraulic pressure relief valve and ask him to send a sample of the hydraulic pressure relief valve for replacement and test. It is a local hydraulic valve manufacturer and they still have samples in stock. After receiving samples and commissioning, the engineer's suspicion was proved to be correct. After replacing the hydraulic pressure relief valve, the hydraulic pump worked normally. Tony asked the original hydraulic valve manufacturer to urgently replenish 30 hydraulic pressure relief valves to solve this complaint. The manufacturer said that the shipment has passed the two-year warranty period. At present, there are only 3 samples in stock. The remaining quantity needs to wait in production schedule for production, and can only be delivered after 3 months. If offering this plan to the big customer, Tony would be scolded by the boss. He thought of AAK, because the hydraulic valve failed last year, which was also solved by AAK. Tony established a business relationship with us last October. Now we are also friends besides business. We often discuss the knowledge related to hydraulic valves. His email on Monday is just to ask for help on this hydraulic pressure relief valve. After knowing these conditions, I asked him to send us samples of those faulty hydraulic pressure relief valves, and provide us the drawings of this hydraulic pressure relief valve, noting those special requirements. After receiving and disassembling the samples from Tony, we found that the main valve spool of the hydraulic pressure relief valve was too loose and had increased leakage, then the pressure at the oil outlet increased. The problem should be caused by high-frequency wear or insufficient accuracy of the original shipped hydraulic pressure relief valve. The engineer of CASAPPA asked us to reply why it was determined that it was the problem of the valve spool?

hydraulic pressure regulating valve 977HP for Kanti power Facing the changes in the energy industry, YOYIK keeps pace with the times, not only focusing on the optimization and upgrading of traditional power generation equipment, but also deeply studying new energy technologies and developing a series of accessories suitable for new energy power generation systems, showing the company's keen insight and forward-looking layout of future energy development trends. While promoting its own development, YOYIK does not forget to fulfill its social responsibilities, is committed to environmentally friendly production, implements energy-saving and emission reduction measures, uses environmentally friendly materials, and reduces environmental pollution. We have diversified supply of various spare parts required for power stations, as follows: #DF-hydraulic pressure regulating valve 977HP-DF pressure regulating valve AGMZO-TERS-PS-010/210/I unloading valve F3-CV1-16-D105-L-40 pressure hose SMS-10-2438-C pressure relief valve YSF9-35/130-KJ Spring type safety valve A48Y-100I 3 2 directional valve D1VW020BVZP75XB510 ductile iron globe valve KJC40C-4.0P hydrogen oil water system oil pump KSB50-250 Seal oil for vacuum pump WS-30-2L direct acting valve 4WE10D33/CG220N9K4/V Solenoid valve 9214603\220VAC The electromagnetic valve 4WE6D62-EW230N9K4-V Self-sealing joint 5400-S5-8 Hydrogen emission main valve PTFE valve core WJ61-F accumulators in hydraulic system SB330H pressure relief valve YSF8-70/80-KJTA Shut-off valve flush plate DX.CXB.03.02 EH regeneration pump 2PE6.5DG28P1-V-VS40 OPC solenoid valve 0508.2582T0101.AW002 Bá»? �?iá»?u �¡p QAW4000 Resistant fuel recirculation pump oil seal DF-F3-1C-20-011 globe valve dn50 WJ40F1.6P.03 pressure relief valve YSF16-25/25-TA O-ring 2 HB4-56J8-59 High pressure accumulator bladder C9212000 main oil pump DLZB820R64B DC high pressure oil pump R900086338 LIMIT SWITCH, MODEL LX3-11 H Radial Roller Bearing DE NU319EC Machinery Seal 3GR42�?44 Gasket HB4-56J8-118 Bag of EH oil high pressure accumulator NXQ1-F16/20-H-HT Fluorine rubber ring DH.00.016 5 2 directional control valve D1VW020BV2PM82XB510 Valve diaphragm KS250ZXN016BQ12SN0ERH centrifugal pump KQW100/200-22/2 hydraulic pressure regulating valve 977HP hydraulic pressure regulating valve 977HP MY-DFYL-2024-6-27

hydraulic relief valves . purchased a batch of hydraulic relief valves for crane system in because the original supplier was not able to meet the delivery. He sent an email last week saying with hydraulic relief valves, the stability is 8% higher than that of the original supplier, and there is almost no external leakage. This surprised him. The use experience of hydraulic relief valves has benchmarked with their previous local hydraulic relief valve manufacturers The vast majority of hydraulic valve bodies are made of nodular iron, vermicular iron and gray iron and cast with resin sand as the molding medium. Therefore, there is sticky sand in the casting, which is easy to pollute the oil system and block the valve and filter, which is the key factor affecting the stability of hydraulic relief valves. Most of the common sand cleaning methods of hydraulic relief valves used in the industry are shot blasting and electrochemical sand cleaning, all of which have limitations. 1. Shot blasting can not completely remove the sticking sand from the valve hole with complex structure and small oil passage, which is easy to affect the tightness and product accuracy, and is not conducive to the stability of the hydraulic relief valves. 2. Electrochemical sand cleaning can relatively remove the sticky sand in the narrow oil passage, but it has high energy consumption, high operation intensity of workers, easy to have human errors, can not completely remove the sticky sand, and is not conducive to the stability of the hydraulic relief valves. Improving the quality of hydraulic parts processing process, improving the cleanliness level and ensuring the stability of hydraulic relief valves has always been the hard index of hydraulic relief valves. Auxiliary processing of hydraulic parts mainly includes: sand cleaning of valve body, deburring or residue treatment of parts and cleaning of hydraulic parts. How does do the sand cleaning of hydraulic relief valves technical team has continuously improved the sand cleaning process of hydraulic relief valves after years of technical improvement. For the sand cleaning of small complex castings, has its own unique sand cleaning 5 methods, namely: artificial aging - Pickling - rinsing - rust prevention - ultrasonic cleaning. Artificial aging is used to reduce the binding force between the casting and sand, acid pickling is used to remove the oxide skin at the joint between the sand and the casting to peel the sand from the casting, and then the explosion of compressed air during ultrasonic cleaning is used to peel off the sand, so as to achieve the purpose of sand cleaning. has its own unique advantages of sand cleaning 5 methods: (1) it is less affected by the casting structure; (2) it is

new hydraulic relief valve. The drawings of the hydraulic relief valve were sent 1 month after the confidentiality agreement was signed. The customer requested that if we were not able to develop it, they would witness us destroy the drawings and documents of the hydraulic relief valve by video. It's the first time for this customer to be so formal After receiving the drawings of hydraulic relief valve, we knew that it was to match with a set of aerospace equipment developed by a world top 500 enterprise in the engineers reviewed the drawings for 3 days and still didn't write the sample program. This hydraulic relief valve is not only small in size, but also has material requirements, machining accuracy requirements and use frequency requirements that exceed the parameter requirements of the hydraulic relief valves we have seen. We estimated that the overall development When we mentioned and give you 1 year of time. If the development is successful, you can wait for the order of hydraulic relief valve. If the development fails, this will be deducted from the payment for in the future. to say that the customer will prepay for the development cost of the hydraulic relief valve, but if it fails, we will need to refund it by deducting from the future payment gradually. I did not hesitate to reply to the email and was willing to try to develop this hydraulic relief valve. hydraulic relief valve development would be counted as the contribution of the technical team, and the failure would be counted as mine, because I can't fail to live up to the customer's support for our development. Some people in can not understand how this could be a kind of support. Maybe he didn't think about a question, that is, what would the mentality of the technical team be without customer support Behind these are two completely different ways of thinking. One is that if you haven't done it yet, think about failure first, think about whether there is a bottom plan first, and if not, don't do it. There is also a way of thinking, which is to think about how to start first. If conditions permit, start working first. The difference between these two ways of thinking is not just the difference between conservative and radical, but whether people are the key factor to create value. With the starting money, the hard work of the technical team and the best logistics

When I opened the mailbox this morning, I saw an from , which should be a re-order for the hydraulic relief valve, because he asked about the durability of hydraulic relief valve spool last week. Opening the , it is indeed the need for purchasing a large number of 420 hydraulic relief valves, and requiring 3 years of quality guarantee. is a purchaser of . 3 years ago, a customer of his company complained that the crane was easy to depressurize during work, resulting in the inability of the crane to bear the force. Especially after the working temperature reaches 55 C, the pressure cannot go up. Field engineers believe that this is a problem of the hydraulic system, such as low pressure regulation of the hydraulic relief valve, wear of the hydraulic system, or oil pollution. No abnormality was found after inspection. Finally, it was determined that the fault occurred on the hydraulic relief valve. After disassembling the hydraulic relief valve, it was found that the cone valve spool was worn, affecting the sealing of the hydraulic system, so the oil pressure could not rise. The customer does not understand why the valve spool of this hydraulic relief valve is worn after less than 2 years of use. The customer requested to replace with a batch of hydraulic relief valves with durability of more than 3 years and use them on these 12 faulty cranes. At that time, contacted more than 10 hydraulic relief valve manufacturers and got reply that the warranty could not be achieved for 3 years. Some hydraulic valve manufacturers replied that they only have 50% confidence. This result embarrassed Bruce. The customer requirements for the hydraulic relief valve could not be implemented, how he should explain to the owner. I received message from on the of can really provide a 3-year warranty hydraulic relief valve I replied directly: just give it a try then you will know. I can't make money with the trial orders of several samples, and you can't lose money. Maybe was stimulated and sent us the test order the next day for 4 hydraulic relief valves. also frankly told that two other hydraulic valve manufacturers would also try the order at the same time. Their plan is that each factory will be tested for 4 samples, with a total of 12 hydraulic relief valves to meet the urgent needs of customer first. About 2 years after the samples were sent, we received from again for another trial order of 8 hydraulic relief valves. I felt strange and thought that they actually didn't have big quantity order for hydraulic valves. Until last week, from his email, we learnt that they had tested the hydraulic relief valves provided by for 3 years. Indeed, 3 years later, hydraulic relief valves still worked normally, and the hydraulic relief valves provided by the other two manufacturers had faults in less than 2 years.

At the beginning of last year, LIEBHERR customized a high-power and high-pressure excavator for their customer. 6 months later, customer complained about oil leakage. After testing, the engineer found that there was no problem with the hydraulic relief valve. The leakage was concentrated in the auxiliary valve, so it was locked as a sealing problem. After disassembling the hydraulic relief valve, it was found that it was caused by the serious wear of the sealing ring. David was responsible for the purchase of hydraulic valves. After he contacted the original factory of hydraulic relief valve, the manufacturer soon sent a new sealing ring. However, a similar situation occurred again in 2 months, and the sealing ring of hydraulic relief valve was replaced for 3 consecutive cycles. The customer was very dissatisfied with this after-sales service and complained directly to the headquarters. The owner asked David to come up with a thorough solution as soon as possible. David was also surprised why the sealing ring of the hydraulic relief valve had to be replaced in 2 months. The manufacturer informed that the pressure and limit temperature of this equipment are very special, especially for high-frequency operation. The service life of the sealing ring of the hydraulic relief valve can only be guaranteed in 2 months, it has to be replaced every 2 months, no other solution. David contacted many other hydraulic valve manufacturers, most of them said that they could only replace the sealing ring every 2 months, and some also suggested changing the whole hydraulic system assembly of the excavator. After 1 year, David hasn't come up with a new plan yet. The customer is unhappy and the owner keeps pushing him. David browsed AAK website and asked directly by email whether AAK has tips on the sealing ring of hydraulic relief valve or not. After receiving the drawings and working conditions of the hydraulic relief valve from David, we found that the pressure of the hydraulic relief valve is 550bar, the limit temperature is 180 â??, and it has very high-frequency operation. Even the high temperature resistant fluororubber sealing ring is not suitable for this hydraulic relief valve. After 3 days of thinking, AAK technical team jumped out of the dead end of thinking about the material of the sealing ring. Can we redesign the structure between the sealing ring and the valve? After the test, it was found that adding "Glyd-ring" may solve the sealing problem of the hydraulic relief valve. David asked us to design and make samples of the hydraulic relief valve installed with Glyd-ring as soon as possible.