| abstract |
The invention concerns a device for controlling the pressure in a flowing viscous material, the device being characterized by: an inlet (8a) through which the material flows into the device, a cylinder (9) capable of holding a particular volume of the material flowing in through the inlet (8a), a plunger (11) which has an aperture (11d) and is fitted to move in the cylinder (9), changing the capacity of the cylinder (9) as it moves, a receptacle (11a) which is fixed over the aperture (11d) in the plunger (11) and connected to the inlet so that the material flows from the inlet (8a) through the receptacle (11a) and through the aperture (11d) in the plunger (11) into the cylinder (9), an outlet (10a) connected to the cylinder (9) and through which the material is discharged from the device. According to the invention, the inlet (8a), the cylinder (9) and the receptacle (11a) must be tubular in design and the receptacle (11a) must slide in telescope fashion over the inlet (8a) when the plunger (11) moves. <IMAGE> |