Port | NINGBO |
Packaging | customized |
Lead Time | 60 |
The quality of the valve spool can only be measured and compared
from the 4
main aspects: the movement sensitivity, stability, no
leakage and long service life of the spool in the valve body. The
6 processing procedures and 6 parameters of AAK valve spool also
impressed Russian customers.
At present, some of the valve spools used by the hydraulic valve
manufacturers are purchased outside from the valve spool factory,
which is the common market goods well known in the hydraulic
valve industry, with high output and low price. There are also
hydraulic valve manufacturers that produce valve spools
themselves, but the workshop only produces and tests according to
the process sheet of the production department, and basically
does not consider the type of hydraulic valve, hydraulic force on
the valve spool, flow coefficient of the valve spool, pressure
and flow characteristics, service scenarios of the hydraulic
valve, and media. That is to use the same production standard to
produce all different types of valve
spools.
Boris from Russia is mainly responsible for purchasing high-end
hydraulic valves, and some requirements are jokingly called
curiosity by peers. Due to restriction of production process or
lack of awareness of quality control, many hydraulic valve
manufacturers dare not accept his orders. Just last month, our
old customer, Erin, brought Boris to our company. I was surprised
at the moment we met. Maybe he was really worried and went
straight to the subject, there was an order for hydraulic flow
valve that couldn't pass the inspection, and then took out 5
samples of hydraulic flow valve.
We conducted simulation tests according to the service scenarios,
media and parameter requirements of the flow valve provided by
him. The test results of the flow valve are not optimistic, the
valve spool is stuck, slightly leak and unstable. Boris spread
his hands, what's the solution? I joked and asked him why you
came to us all of a sudden. He pointed to Erin. She told me that
if multiple factories failed to make qualified samples
continuously, you could only try AAK
Hydraulic Valve. I told him directly that Erin was right
and you were right to come here. The valve spools of these flow
valves are not accurate enough. Give me 10 days and we will give
you 5 high-precision flow valves.
10 days later, his Shanghai Office received 5 samples of our
high-precision flow valves. 2 days later, Boris asked us how long
it would take to produce 10,000 flow valves. It seems that the
sample quality of AAK flow valve has convinced
him.
Why can AAK Hydraulic Valve produce the flow valve that the peers
can't or don't want to produce? AAK Hydraulic Valve not only has
6 processes, but also 6 parameter indexes as quality
assurance:
1. Rough machining of valve spool, select appropriate bar
material, cut the size, normalize and quench and temper.
Parameter requirements: hardness above
32HRC.
2. Finish machining for the first time, flat end face, drill the
center hole, the core is in the hole row, and the hole accuracy.
Parameter requirements: the accuracy shall not be higher than
0.005mm, and the surface roughness Ra value shall not be higher
than 0.16 μ m.
3. Step 3: the semi-finished work piece is subject to vacuum
quenching unique to AAK and then stabilized. It is required to be
cold treated at - 80
℃
for 2h, aging temperature of 420
℃
and heat preservation of more than 10h. Parameter requirements:
hardness above 66HRC.
4. Finish machining again. First rough grind the outer circle and
each end face of the shoulder. The core is the size matching
between the outer circle and shoulder of the valve spool and the
valve sleeve. Different clearance dimensions are implemented
according to different hydraulic valves. Parameter requirements:
no more than 0.005--0.035mm
5. Grind the outer circle carefully, after stabilizing the work
piece, then grind the center hole of valve spool. Parameter:
surface roughness Ra value is not higher than 0.1 μ
m.
6. Finishing. For the high precision hydraulic valve, we adopt
mirror grinding and finishing, double wheel honing, and our peers
basically adopts fine grinding. Parameter requirements: surface
roughness Ra value is not higher than 0.01 μ
m.
After all valve spool processes are completed, our valve spool Ra
value is 0.01 μ m. Ra value of valve spool of most peers is 0.08
μ m. Ra value of valve spool of a few peers is 0.02 μ m. The
comparison of these values is the embodiment of our valve spool
process strength.
AAK
Hydraulic Valve spool has 6 processes and 6 parameters, which has
taken 6 steps ahead of its peers. AAK Hydraulic Valve
precision parameters, peers may be able to think of, but in most
cases cannot achieve it, you are encouraged to have a small try
with AAK Hydraulic Valve.
Room 904, 9F Bona Business Building, No. 456 Taikang Middle Road, Yinzhou, Ningbo, China