AAK hydraulic relief valves with wall thickness less than 2mm

Smith is from Mexico and has been smooth on purchasing hydraulic valves, but
encountered a nail when purchasing a hydraulic relief valve with a wall
thickness of less than 2mm. His boss received an order for a special hydraulic
relief valve, requiring Smith's team to complete the sample within 45 days. The
wall thickness of the valve cage of the hydraulic relief valve is less than
2mm, and the fitting clearance of the valve cage is 0.016mm-0.02mm. Thin wall
and high precision. 4 hydraulic relief valve manufacturers, 3 rounds of
proofing, 30 days passed, none of them succeeded, and the manufacturers all
surrendered. The boss is not satisfied, and the team also complains that Smith
does not know how to decline the boss, and Smith is helpless.

Smith had to find a new hydraulic relief valve supplier himself. He consulted
more than 20 hydraulic relief valve manufacturers online and offline, but only
one was willing to try, and the others did not even have the courage to try.
Smith found AAK on Google and left a message asking: can AAK make samples for a
hydraulic relief valve with wall thickness less than 2mm? I replied directly
that AAK shipped similar hydraulic relief valves 2 years ago. Smith may have
seen hope, and directly told us that he wants AAK and another manufacturer of
hydraulic relief valves to sample at the same time. My reply: AAK likes this
kind of direct PK. If AAK hydraulic relief valve fails to meet the standard,
the test order fee will be returned.

3 weeks later, AAK sent the hydraulic relief valves. 1 week later, Smith
advised that the samples of AAK hydraulic relief valve has a wall thickness of
the valve cage less than 2mm, the cylindricity was not more than 0.01mm, the
roughness Ra was ≤ 0.2, and the pass rate was 100%. While the pass rate of
another hydraulic valve manufacturer was 80%, Smith was surprised that the pass
rate of AAK samples was 100%, and worried about the pass rate of mass
production. I told him that the standard of the mass production would be same
as the samples. The processing of this valve cage may be a hindrance for other
hydraulic valve manufacturers, but AAK mass produced it 2 years ago.

1.Basic link: before processing, grinding the outer circle as Φ14.3, the heat
treatment shall be complete and prevent deformation. After processing, ensure
the inner hole Φ9.9, the cylindricity shall not be greater than 0.01mm. The
outer circle shall be machined to ensure Φ14.1, and coaxiality with the Φ 9.9
inner hole is not greater than Φ 0.02.

2.Key link: process 4 ring grooves and 6 holes on the cage wall to ensure the
size of 6 ± 0.01, and improve the requirements of symmetrical position of
holes and grooves with respect to the center line, with the symmetry not
greater than 0.025mm. Semi Fine honing the Φ 9.9 hole to ensure the inner hole
Φ 9.97, and the cylindricity is not more than 0.005mm.

3. Tips link: self made mandrel with precise reference Φ 9.97 positioning and
fine grinding of outer circle Φ 14, and coaxiality with Φ 9.97 hole not
greater than Φ 0.025. Finish honing the inner hole to eliminate the clamping
trace: smooth the hole with J95 oil stone Φ 10. The speed is 800-1000r / min
to ensure the inner hole Φ 10 and surface roughness Ra 0.2.

AAK hydraulic relief valves, focus on details, no deformation, high precision,
welcome to try!

https://www.aakindustry.com/info-detai , l/hydraulic-relief-valves-aak330

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