A sand bypass separator is provided for separating particulate matter from a fluid mixture in a production well and directing the separated particulate matter away from a pump intake. The separator includes an outer tube, an inner tube positioned within the outer tube, and a bypass. The outer tube has a plurality of slots to allow the fluid mixture to enter the separator between the outer tube and the inner tube. As the fluid mixture moves downward, the fluid mixture reaches a downward velocity sufficient to allow the particulate matter in the fluid mixture to continue downward as the fluid is drawn into the inner tube through the pump intake. The bypass extends from above the pump intake to below the pump intake to collect and direct the separated particulate matter separated below the pump intake.

A sand bypass separator is provided for separating particulate matter from a fluid mixture in a production well and directing the separated particulate matter away from a pump intake. The separator includes an outer tube, an inner tube positioned within the outer tube. The outer tube has a plurality of slots to allow the fluid mixture to enter the separator between the outer tube and the inner tube. As the fluid mixture moves downward, the fluid mixture reaches a downward velocity sufficient to allow the particulate matter in the fluid mixture to continue downward as the fluid is drawn into the inner tube through the pump intake. A bypass that extends from above the pump intake to below the pump intake to collect and direct the separated particulate matter separated below the pump intake may also be included.

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.

This solid-liquid separator (100a) includes a screw type dehydration unit (2) including a screw (22) and that performs primary dehydration on an object to be processed, and a rotary-body type dehydration unit (3) including a plurality of rotary bodies (30), disposed subsequent to the screw type dehydration unit, and that performs secondary dehydration on the object to be processed on which the primary dehydration has been performed by the screw type dehydration unit. The screw rotates at a higher rotational speed than those of the rotary bodies.

A sand bypass separator is provided for separating particulate matter from a fluid mixture in a production well and directing the separated particulate matter away from a pump intake. The separator includes an outer tube, an inner tube positioned within the outer tube. The outer tube has a plurality of slots to allow the fluid mixture to enter the separator between the outer tube and the inner tube. As the fluid mixture moves downward, the fluid mixture reaches a downward velocity sufficient to allow the particulate matter in the fluid mixture to continue downward as the fluid is drawn into the inner tube through the pump intake. A bypass that extends from above the pump intake to below the pump intake to collect and direct the separated particulate matter separated below the pump intake may also be included.

A sand bypass separator is provided for separating particulate matter from a fluid mixture in a production well and directing the separated particulate matter away from a pump intake. The separator includes an outer tube, an inner tube positioned within the outer tube. The outer tube has a plurality of slots to allow the fluid mixture to enter the separator between the outer tube and the inner tube. As the fluid mixture moves downward, the fluid mixture reaches a downward velocity sufficient to allow the particulate matter in the fluid mixture to continue downward as the fluid is drawn into the inner tube through the pump intake. A bypass that extends from above the pump intake to below the pump intake to collect and direct the separated particulate matter separated below the pump intake may also be included.

A sand bypass separator is provided for separating particulate matter from a fluid mixture in a production well and directing the separated particulate matter away from a pump intake. The separator includes an outer tube, an inner tube positioned within the outer tube. The outer tube has a plurality of slots to allow the fluid mixture to enter the separator between the outer tube and the inner tube. As the fluid mixture moves downward, the fluid mixture reaches a downward velocity sufficient to allow the particulate matter in the fluid mixture to continue downward as the fluid is drawn into the inner tube through the pump intake. A bypass that extends from above the pump intake to below the pump intake to collect and direct the separated particulate matter separated below the pump intake may also be included.

Disclosed is a laminated spiral solid-liquid separator with a torsional pendulum motion, the separator comprising fixed rings, movable rings and a screw shaft, wherein the screw shaft is provided with the fixed rings and the movable rings in a staggered arrangement in a radial direction to form a cavity. The separator further comprises a support rod sleeved in one end of the movable ring. The movable rings connect all the movable rings together to form a linkage by means of one or more kind of linkage mechanisms. The linkage is driven by one or more drive devices to swing about the support rod which is served as the center. Support devices are arranged on two or more positions in the cavity. Both a fixing rod on the fixed rings and the support rod on the movable rings pass through the support devices.

A sand bypass separator is provided for separating particulate matter from a fluid mixture in a production well and directing the separated particulate matter away from a pump intake. The separator includes an outer tube, an inner tube positioned within the outer tube, and a bypass. The outer tube has a plurality of slots to allow the fluid mixture to enter the separator between the outer tube and the inner tube. As the fluid mixture moves downward, the fluid mixture reaches a downward velocity sufficient to allow the particulate matter in the fluid mixture to continue downward as the fluid is drawn into the inner tube through the pump intake. The bypass extends from above the pump intake to below the pump intake to collect and direct the separated particulate matter separated below the pump intake.

This solid-liquid separator (100a) includes a screw type dehydration unit (2) including a screw (22) and that performs primary dehydration on an object to be processed, and a rotary-body type dehydration unit (3) including a plurality of rotary bodies (30), disposed subsequent to the screw type dehydration unit, and that performs secondary dehydration on the object to be processed on which the primary dehydration has been performed by the screw type dehydration unit. The screw rotates at a higher rotational speed than those of the rotary bodies.