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Diesel Generators Inverters & Biomass
Tel: +27 13 752 7822
Cell: +27 82 814 4207
Cell: +27 82 553 8550
22a Nebo Park
14 Suikerriet Avenue
Nelspruit, Mpumalanga,
1200
Tel: +27 13 752 7822
Cell: +27 82 814 4207
Cell: +27 82 553 8550
22a Nebo Park
14 Suikerriet Avenue
Nelspruit, Mpumalanga,
1200
Commercial &
Industrial Pumps
Tel: +27 13 752 7822
Cell: +27 82 748 3858
Cell: +27 82 747 6172
22a Nebo Park
14 Suikerriet Avenue
Nelspruit, Mpumalanga,
1200
Industrial Pumps
Tel: +27 13 752 7822
Cell: +27 82 748 3858
Cell: +27 82 747 6172
22a Nebo Park
14 Suikerriet Avenue
Nelspruit, Mpumalanga,
1200
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A rotary pump is a positive displacement pump consisting of a chamber containing gears, cams, screws, vanes, plungers or similar elements actuated by relative rotation of the drive shaft to casing, and which has no separate inlet and outlet valves. These pumps are characterized by their close-running clearances.
There are seven common basic types of rotary pumps identified by the type of pumping element.
Vane
In this type, the vane or vanes, which may be in the form of blades, buckets, rollers, or slippers, cooperate with a cam to draw fluid into and force it from the pump chamber. These pumps may be made with vanes in either the rotor or stator and with radial hydraulic forces on the rotor balanced or unbalanced. The vane-in-rotor pumps may be made with constant or variable displacement pumping elements.
Piston
In this type, fluid is drawn in and forced out by pistons which reciprocate within cylinders, with the valving accomplished by rotation of the pistons and cylinders relative to the ports. The cylinders may be axially or radially disposed and arranged for either constant or variable displacement pumping. All types are made with multiple pistons except that the constant displacement radial type may be either single or multiple piston.
Flexible member
In this type, the fluid pumping and sealing action depends on the elasticity of the flexible member(s). The flexible members may be a tube, a vane, or a liner.
Lobe
In this type, fluid is carried between rotor lobe surfaces and the pumping chamber from the inlet to the outlet. The rotor surfaces cooperate to provide continuous sealing. The rotors must be timed by separate means. Each rotor has one or more lobes.
There are seven common basic types of rotary pumps identified by the type of pumping element.
Vane
In this type, the vane or vanes, which may be in the form of blades, buckets, rollers, or slippers, cooperate with a cam to draw fluid into and force it from the pump chamber. These pumps may be made with vanes in either the rotor or stator and with radial hydraulic forces on the rotor balanced or unbalanced. The vane-in-rotor pumps may be made with constant or variable displacement pumping elements.
Piston
In this type, fluid is drawn in and forced out by pistons which reciprocate within cylinders, with the valving accomplished by rotation of the pistons and cylinders relative to the ports. The cylinders may be axially or radially disposed and arranged for either constant or variable displacement pumping. All types are made with multiple pistons except that the constant displacement radial type may be either single or multiple piston.
Flexible member
In this type, the fluid pumping and sealing action depends on the elasticity of the flexible member(s). The flexible members may be a tube, a vane, or a liner.
Lobe
In this type, fluid is carried between rotor lobe surfaces and the pumping chamber from the inlet to the outlet. The rotor surfaces cooperate to provide continuous sealing. The rotors must be timed by separate means. Each rotor has one or more lobes.
Gear
In this type, fluid is carried between gear teeth and displaced when they mesh. The surfaces of the rotors cooperate to provide continuous sealing and either rotor is capable of driving the other.
External gear pumps have all gear rotors cut externally. These may have spur, helical, or herringbone gear teeth and may use timing gears.
Internal gear pumps have one rotor with internally cut gear teeth meshing with an externally cut gear. Pumps of this type are made with or without a crescent-shaped partition.
Circumferential piston
In this type, fluid is carried from inlet to outlet in spaces between piston surfaces. There are no sealing contacts between rotor surfaces. In the external circumferential piston pump, the rotors must be timed by separate means, and each rotor may have one or more piston elements. In the internal circumferential piston pump, timing is not required, and each rotor must have two or more piston elements.
Screw
In this type, fluid is carried in spaces between screw threads and is displaced axially as they mesh.
Single screw pumps (commonly called progressing cavity pumps), have a rotor with external threads and a stator with internal threads. The rotor threads are eccentric to the axis of rotation.
Screw and wheel pumps depend upon a plate wheel to seal the screw so that there is no continuous cavity between the inlet and outlet.
Multiple screw pumps have multiple external screw threads. Such pumps may be timed or untimed.
In this type, fluid is carried between gear teeth and displaced when they mesh. The surfaces of the rotors cooperate to provide continuous sealing and either rotor is capable of driving the other.
External gear pumps have all gear rotors cut externally. These may have spur, helical, or herringbone gear teeth and may use timing gears.
Internal gear pumps have one rotor with internally cut gear teeth meshing with an externally cut gear. Pumps of this type are made with or without a crescent-shaped partition.
Circumferential piston
In this type, fluid is carried from inlet to outlet in spaces between piston surfaces. There are no sealing contacts between rotor surfaces. In the external circumferential piston pump, the rotors must be timed by separate means, and each rotor may have one or more piston elements. In the internal circumferential piston pump, timing is not required, and each rotor must have two or more piston elements.
Screw
In this type, fluid is carried in spaces between screw threads and is displaced axially as they mesh.
Single screw pumps (commonly called progressing cavity pumps), have a rotor with external threads and a stator with internal threads. The rotor threads are eccentric to the axis of rotation.
Screw and wheel pumps depend upon a plate wheel to seal the screw so that there is no continuous cavity between the inlet and outlet.
Multiple screw pumps have multiple external screw threads. Such pumps may be timed or untimed.
KCP Series Gear Oil Pumps
CYZ Series Self Priming Pumps
ZW Series Self Priming Pumps
Screw Type Pumps
Industrial Pumps Type - Rotary Pumps
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