AAK hydraulic check valves added with thread Anaerobic adhesives, 0 leakage

Last Friday, we received 3 emails from Niki, they are all the order for a same
hydraulic check valve, but only the ship to address is different. It is the
first time for their company to place the orders of 1,500 hydraulic check
valves at one time. Niki is a purchaser of a Dutch hydraulic equipment company.
Last year, a boarding bridge equipment needed hydraulic check valves. At that
time, he planned to purchase from old suppliers. Unexpectedly, after dozens of
hydraulic check valves from the initial samples were installed on the boarding
bridge and tested for less than a month, the boarding bridge will slowly
decline automatically. The engineer judged that the hydraulic system did not
maintain the pressure, and it is likely that some hydraulic check valves
leaked. However, after disassembling and inspecting the hydraulic check valves,
it was found that the matching clearance accuracy of the valve spool and valve
sleeve was within the normal range, and there was no jamming.

Niki contacted the hydraulic check valve manufacturer, and manufacturer also
didn't know why the hydraulic check valve leaked, so they could only replace
those leaking hydraulic check valves. Niki is a little worried that if the
leakage source of the hydraulic check valve is not found and replaced blindly,
there may be a bigger problem later. Niki was not satisfied with the old
supplier and had to start looking for new manufacturers of hydraulic check
valves again.

AAK received message from Niki on our website: what are the reasons for the
leakage of hydraulic check valves? I realized that there was a leak in the
hydraulic check valves purchased by Niki, but he hasn't found the root cause.
After receiving the drawings of hydraulic check valve and the working
conditions of boarding bridge equipment provided by Niki, we still can't 100%
determine what caused the leakage of hydraulic check valve. We suggest him send
us one of the previously leaked hydraulic check valves for analysis. After
dismantling, our engineer is 90% sure to understand the root cause of the
leakage, but still need to try sample to make it 100% sure. Niki is also
willing to allow AAK to make samples according to his hydraulic check valve
drawing.

One month later, we sent 12 samples of hydraulic check valves to Niki and told
him that the leakage of the hydraulic check valves from original manufacturer
should be caused by poor details in production. There will be a certain gap
between the cap and the thread of the valve sleeve of the hydraulic check
valve. How to seal this gap is not only the detail but also the key, especially
for the equipment with high working conditions. AAK uses thread anaerobic
adhesive, which can completely fill the gap, enhance the sealing or retention
force of mechanical connection components, prevent thread loosening and leakage
due to vibration between the cap and valve sleeve of hydraulic check valves,
and protect the joint from corrosion. Few hydraulic valve manufacturers can
operate in this detail of gap sealing. Niki learned about this analysis, and
replied that among more than 20 hydraulic check valve manufacturers he
contacted, only AAK analyzed the sealing details. He expected to test the
function of AAK hydraulic check valve samples.

The 3 consecutive emails for orders last Friday should be indicating that the
samples of AAK hydraulic check valves have passed the test. Niki specifically
stated in the email that the reason why he chose AAK was that every detail of
AAK hydraulic check valves was perfect and there was no leakage, so he placed
big orders.

AAK hydraulic check valves, focused on every detail, you are warmly welcome to
have a small try!

https://www.aakindustry.com/info-detai , l/hydraulic-check-valves-aak166

Click to Enlarge