• 
  valve body
• 
  steel cylinder
• 
  semifinished product
• 
  roller
• 
  rail wheel

• 
  Piston
• 
  Piston Pole
• 
  Hydraulic Pressure Forge Piece
• 
  Gear
• 
  Forge Piece

• 
  Forge Piece Tank
• 
  Driving whee
• 
  cylinder tube
• 
  cylinder bottom
• 
  Annular Piece

• 
  Annular Piece