Disclosed is a multi-shaft laminated spiral solid-liquid separator, the separator comprising fixed rings, movable rings and screw shafts), wherein each of the screw shafts is provided with the fixed rings and the movable rings in a staggered arrangement in a radial direction to form a cavity; there are two or more screw shafts arranged in the cavity side by side, and the fixed rings and the movable rings are in a form of an annular structure with two rings staggered and communicated or multiple rings staggered and communicated.

A milking device for milking a dairy animal is provided with milking mechanism, a control system, a milk pipeline for transporting the milk from the milking mechanism to a milk tank, a milk filter and a cleaning device. The cleaning device includes at least one cleaning fluid holder, a heating device for heating cleaning fluid in the cleaning fluid holder, an additive storage holder for additive, an additive adding device for controlled addition of the additive to cleaning fluid, and a valve system for regulating flows of cleaning fluid and additive through the milking device. The cleaning device is configured for carrying out a cleaning cycle of the milking device with a prerinse with cold or tepid water, a hot rinse with heated water and an acidic or basic additive, a postrinse, and at least between the hot rinse and the postrinse, a counterflow cleaning step by passing cleaning fluid in counterflow through the milk filter. Thus, a milking device is provided that can be cleaned automatically as a whole including the milk filter. In particular, because the counterflow cleansing takes place after the hot rinse step, there is better removal of dirt and milk residues that are softened thereby, in particular from the milk filter.

A milking device for milking a dairy animal is provided with milking mechanism, a control system, a milk pipeline for transporting the milk from the milking mechanism to a milk tank, a milk filter and a cleaning device. The cleaning device includes at least one cleaning fluid holder, a heating device for heating cleaning fluid in the cleaning fluid holder, an additive storage holder for additive, an additive adding device for controlled addition of the additive to cleaning fluid, and a valve system for regulating flows of cleaning fluid and additive through the milking device. The cleaning device is configured for carrying out a cleaning cycle of the milking device with a prerinse with cold or tepid water, a hot rinse with heated water and an acidic or basic additive, a postrinse, and at least between the hot rinse and the postrinse, a counterflow cleaning step by passing cleaning fluid in counterflow through the milk filter. Thus, a milking device is provided that can be cleaned automatically as a whole including the milk filter. In particular, because the counterflow cleansing takes place after the hot rinse step, there is better removal of dirt and milk residues that are softened thereby, in particular from the milk filter.

The slit spiral tube for self-cleaning pressure filters in which the spiral element is mounted on supports, by maintaining the spiral circumferential slit wherein, in the spiral circumferential slit (s) there is a fixed working spiral moving back and forth. The slot self-cleaning pressure filter for dewatering liquid media consisting of a cylindrical casing in which there is a medium inflow, an effluent outflow and a sludge overflow and slit spiral tubes placed centrally, axially one in another, out of which each tube has a spiral element fixed on supports by maintaining the spiral circumferential slit, wherein, in the spiral circumferential slit (s) of both the external slit spiral tube and the internal slit spiral tube a working spiral moving back and forth is mounted, whereas, between the slit spiral tubes and a motor-driven spiral rotatable scraper is mounted.

The slit spiral tube for self-cleaning pressure filters in which the spiral element is mounted on supports, by maintaining the spiral circumferential slit wherein, in the spiral circumferential slit (s) there is a fixed working spiral moving back and forth. The slot self-cleaning pressure filter for dewatering liquid media consisting of a cylindrical casing in which there is a medium inflow, an effluent outflow and a sludge overflow and slit spiral tubes placed centrally, axially one in another, out of which each tube has a spiral element fixed on supports by maintaining the spiral circumferential slit, wherein, in the spiral circumferential slit (s) of both the external slit spiral tube and the internal slit spiral tube a working spiral moving back and forth is mounted, whereas, between the slit spiral tubes and a motor-driven spiral rotatable scraper is mounted.

The invention relates to a filter element comprising one or more fluid-pervious layers of a fluid-pervious sheet material having first and second surfaces in a substantially parallel arrangement, a fluid-impervious layer arranged in fluid tight contact with at least one of said first and second surfaces of said layer(s) of fluid-pervious sheet material to substantially fully cover the first and/or second surfaces thereof, one or more first and second edge portions, said first and second edge portions being arranged at a predefined distance and separated from one another by a predefined area of the fluid-pervious sheet material, a fluid flow path limited to and extending essentially parallel to the first and second surfaces from the first edge portion(s) to the second edge portion(s) within each of said layers of fluid-pervious sheet material, said first and second edge portions providing a fluid intake and a fluid drainage at the upstream and downstream ends of said fluid flow path, respectively. The invention further relates to filter modules comprising one or more of said filter elements.

The invention relates to a filter element comprising one or more fluid-pervious layers of a fluid-pervious sheet material having first and second surfaces in a substantially parallel arrangement, a fluid-impervious layer arranged in fluid tight contact with at least one of said first and second surfaces of said layer(s) of fluid-pervious sheet material to substantially fully cover the first and/or second surfaces thereof, one or more first and second edge portions, said first and second edge portions being arranged at a predefined distance and separated from one another by a predefined area of the fluid-pervious sheet material, a fluid flow path limited to and extending essentially parallel to the first and second surfaces from the first edge portion(s) to the second edge portion(s) within each of said layers of fluid-pervious sheet material, said first and second edge portions providing a fluid intake and a fluid drainage at the upstream and downstream ends of said fluid flow path, respectively. The invention further relates to filter modules comprising one or more of said filter elements.

A lateral filter, a method of its use, and a system incorporating at least one lateral filter are provided. The lateral filter includes a filter screen that includes a screen wire and screen support rod comprise a non-metallic material and are a unitary, integrated, inseparable, and singular component. In using the lateral filter, a fluid entrained with solids is introduced through an exterior-facing side and permeate forms in the interior of the filter. The solids remaining in the permeate, if any, have a smallest dimension that is less than a width of a slot in the filter screen. The permeate passes from the interior of the lateral filter. Lateral filters may be incorporated into a system comprising many lateral filter, such as sand filter is configured to filter raw seawater.

A filter for use in filtering a fluid slurry that includes particles of varying size, such as pool water including debris, is provided. The filter is in electrical communication with a sensor and includes a housing having an inlet to receive the fluid slurry, an outlet, and an internal chamber. An actuator can be coupled to the filter media to move at least a portion of the filter media to vary a dimension of the pores. The filter also includes a controller connected to the actuator that is capable of receiving a signal from the sensor and controls the actuator to change the dimension of the pores based on the signal.

A filter for use in filtering a fluid slurry that includes particles of varying size, such as pool water including debris, is provided. The filter is in electrical communication with a sensor and includes a housing having an inlet to receive the fluid slurry, an outlet, and an internal chamber. An actuator can be coupled to the filter media to move at least a portion of the filter media to vary a dimension of the pores. The filter also includes a controller connected to the actuator that is capable of receiving a signal from the sensor and controls the actuator to change the dimension of the pores based on the signal.