1.Level 2 cylinder piston guide ring
2.Level 2 cylinder piston sealing ring
13.High pressure valve core
3.Level 2 cylinder piston guide ring
4.Level 2 cylinder sealing ring
5.Level 2 cylinder piston sealing ring (up)
6.Level 2 cylinder piston sealing ring (down)
7.Level 2 cylinder piston sealing ring
18.Sealing gasket of bleed valve
8.Level 2 cylinder piston sealing gasket
9.High pressure piston sealing ring
10.High-pressure piston sealing gasket