1^st ALT

2^nd ALT

3rd ALT

Initial design

Second design

Final design

In 23,000 cycles, fracture of suction reed valve is less than 1.

8,687 cycles: 1/20 (5.0 %)

8,687 cycles: 19/20 Suspension

17,000 cycles: 3/30 (10.0 %)

17,000 cycles: 27/30 Suspension

23,000 cycles: 30/30 OK

29,000 cycles: 30/30 OK

Suction reed valve structure

Material and specification

SANDVIK 20C 0.178t

(Carbon Steel)

®SANDVIK 7C 0.178t

(Stainless Steel)

FCD500 + No Heat Treatment

®FCD500 + Heat Treatment