Hydraulic Sausage Stuffer E8-FNA: Equipment for Sausage Production
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The hydraulic syringe-doser E8-FNA is an example of equipment for sausage production, designed to make smoked and semi-smoked sausages in artificial and natural casings, as well as frankfurters and sausages. The output of the E8-FNA syringe is 1000 kg per hour. 
Loading begins when the sausage mince is placed into the hopper and the electric motors driving the gear pump and vacuum pump are switched on. The gear pump is engaged using an under-knee lever connected to a spool valve. Oil then passes through a reduction valve and the spool valve under pressure into the rod cavity of the power hydraulic cylinder.
As a result, the piston of the mince cylinder begins to descend. A vacuum forms in the piston cavity of the cylinder, the cone valve lowers, and the mince is drawn into the cylinder through an annular gap. In the rod cavity of the mince cylinder, excess air pressure builds up, which acts through a hose on the spool rod of the vacuum spool valve.
The rod then lowers, aligning the cavity of the mince cylinder with the vacuum line of the pump. This is how the loading and vacuuming of the mince takes place. 
The labelled components of the E8-FNA syringe-doser (Figure 1, general view) are as follows:
- 1 – frame
- 2 – mince cylinder
- 3 – power hydraulic cylinder
- 4, 5 – pistons
- 6 – dosing device
- 7 – dosing hydraulic cylinder
- 8 – dose regulator
- 9 – flange electric motor
- 10 – gear pump
- 11 – under-knee lever
- 12 – dosing cup
- 13 – nozzle (spout)
- 14 – cabinet with electrical equipment
- 15 – cover
- 16 – hopper
- 17 – baffle plate
The full loading cycle continues until a signal lamp lights up and the spool rod returns to its starting position. The dosing syringe is then activated by switching the intermediate lever of the spool valve. Oil from the pump passes through the reduction valve and spool valve into the piston cavity of both the power and dosing hydraulic cylinders.
In addition, oil flows through a throttle fitted with a regulator and a safety valve into the cavity of the hydraulic motor. The rod of this throttle, with its regulator and safety valve, is set by means of a handle to the position required according to the desired output rate.
The hydraulic motor transmits rotation to a shaft carrying the nozzle and delivers reversing motion to the dosing cup. The reversing movement is produced by a gear, crank mechanisms and a connecting rod. The dosing cup begins to move around its axis at the moment its opening aligns with the opening of the mince cylinder. The mince then enters the cavity of the dosing cup under pressure and starts to push against the dosing piston.
The force is transmitted through the rod to the piston. Because the ratio of the working surfaces of one set of pistons is smaller than the ratio of the working surfaces of the other set, the pressure created in the piston cavity of the dosing hydraulic cylinder exceeds the pressure in the common line. The reduction valve then operates, the dosing piston moves down, and the cavity of the dosing cup fills with mince.
This process continues until the piston meets the dose regulator. The dosing can be adjusted on the fly, and its value is fixed on a scale. When the opening of the dosing cup aligns with the opening of the nozzle cavity — that is, with the atmosphere — the force of the oil pressure is transmitted through the rod to the dosing piston, which forces the mince out through the nozzle and into the casing. The stuffing process stops once the under-knee lever is released.
