95 visiting now: 79 USA USA flag 9 Belgium Belgium flag 4 UK UK flag 2 China China flag 1 Singapore Singapore flag 1 Hong Kong Hong Kong flag 1 Russia Russia flag

Highlighted Companies

Aak Unique Hydraulic Relief Valve With Glyd Ring Added Is Zero Oil Leak - China

price: 100.00 Dollar US$

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 boss 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 boss 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 ℃, 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.

After 30 days, their engineer installed AAK hydraulic relief valve for customer.

2 months later, the customer didn't call to complain.

David felt that AAK might have solved the sealing problem of the hydraulic relief valve that had plagued them for more than a year.

6 months later, there was still no leakage.

David was relieved finally.

The customer recognized this solution, and the boss was also very happy.

In particular, their engineers appreciated AAK design ability and quality.

AAK newly designed hydraulic relief valve is to open a small groove in the contact section between the valve spool and the valve sleeve to install the dynamic seal of Glyd-ring.

Most peers can't think of such installation.

Even if they think of it, there may be few factories who can operate the process.

Such a sealing system can ensure high-frequency friction.

The material has stable performance, the pressure resistance range can be below 600bar, and the temperature range is - 30 ℃ - + 200 ℃.

Through the dynamic deformation of the sealing ring, it can ensure 100% sealing and prevent the pressureless liquid leakage.

The sealing of AAK hydraulic relief valve, may be thought of by peers, but it may not be possible to do so.

There are wonderful tricks in seal design.

Welcome to give it a try! AAK HYDRAULIC VALVE (141) 2022-01-19


Company Contact:


  • Phone: +8657483008115

  • Address: Bona Business Building, No. 456 Taikang Middle Road,, Yinzhou, Ningbo, China, Ningbo , Zhejiang , China

  • Email: Email


Published date: March 10, 2022

  • Business Description: Focused on the Development and Manufacturing of Hydraulic Valves since 2006, in Ningbo China

    Since its establishment 12 years ago, 6 first-line international brand importers have placed orders with AAK for 5 consecutive years, with a re-peat order rate of 62%.

    Exported to more than 20 countries, AAK Hydraulic Valves used on "AIRCRAFT" have been supplied to Russian customers.

    68%+ of the high precision hydraulic valves exported from Ningbo Port come from AAK hydraulic valves.

Related listings



  • Hydraulic Directional Valve That Jammed On Trial Was Not The Same After Aak Took Over
    Hydraulic Directional Valve That Jammed On Trial Was Not The Same After Aak Took Over
    Machine made parts - AAK Industry CO., LTD - China - December 9, 2021 - 100.00 Dollar US$

    Some time ago, Steven, from a Hydraulic Valve Company in UK, fell in a batch of hydraulic directional valves purchased in Ningbo. There had some email communication between AAK HYDRAULIC VALVE and Steven, but maybe the fate has not yet arrived, we di...

  • Drawer Slide G13 Slim Metal Tandem Box
    Drawer Slide G13 Slim Metal Tandem Box
    Machine made parts - DongGuan GARIS Precision Hardware Technology CO.,LTD - China - December 2, 2021 - 20.00 Dollar US$

    Slim Tandem - Mini Box Drawer Slide - G13 Slim Metal Tandem Box can be used for the whole house furniture. Such as kitchen cabinet, wardrobe, bathroom vanity, TV cabinet etc. Product Advantages Why should we buy Tandem Box - Mini Box Drawer Slide - G...

  • Tobee® Slurry Pump Impellers
    Tobee® Slurry Pump Impellers
    Machine made parts - HEBEI TOBEE PUMP CO., LIMITED - China - November 24, 2021 - 2000.00 Dollar US$

    Tobee® Slurry Pump impeller is one of the most important parts of centrifugal slurry pump. Depending on site application, slurry pump impeller selection can be crucial to pump performance. Slurry applications can be especially hard on the impeller of...



Safe Trade Tips

  • Ask for business references and check them
  • Use a payment method that offers better protection for all such as Letters of credit and verified professional escrow services. Avoid payments in advance such as money transfers
  • Verify their business via their local Chamber of Commerce
  • Search the internet using their website address, their business name, their phone and fax numbers, and their email addresses to see if you can find any feedback about them.
  • Get to know more about scams and fraud to avoid: Internet Crime Complaint Center - Consumer Financial Protection Bureau
  • This site is never involved in any transaction, and does not handle payments, shipping, guarantee transactions, provide escrow services, or offer "buyer protection" or "seller certification"