1. Precisely control filling amount through control of piston stroke of the cylinder with a fixed volume. 2. Under the prerequisite of maximum filling amount: change the filling amount as per customer needs. 3. It can choose single head or multi-head combination as per capacity to realize single head or multi-head filling line. 4. Filling leaves no drop; high precision. 5. Easy and convenient operation; reliable performance. Applicable scope: it is suitable for filling of viscous solutions in industries like pharmaceutical, food, chemical industry, cosmetics and agriculture.