German Sera pump Sera model Sera price

Sera pumps are mechanical devices that meter the delivered liquid. They are often used in complete chemical dosing systems and are therefore also called dosing pumps. They are a special type of positive displacement pump designed to meet various strict process requirements, with flow rate infinitely adjustable within the 0-100% range for transporting liquids (especially corrosive liquids).

Sera pump structure and classification

The pump consists of three parts: motor, transmission box, and cylinder body. The transmission box components consist of a cam mechanism, stroke adjustment mechanism, and ratio worm gear mechanism; the plunger stroke is adjusted by rotating the adjustment handwheel, thereby changing the diaphragm extension distance to achieve flow rate adjustment. The cylinder body components consist of the pump head, suction valve group, discharge valve group, diaphragm base, etc. Dosing metering pumps can be classified by drive type into motor-driven and electromagnetic types. For motor-driven metering pumps, flow rate adjustment can be achieved by using a frequency converter to change the motor speed, or by adjusting the piston stroke. Installing a servo motor (ATE) allows left and right rotation to adjust the angle, increasing or decreasing the piston stroke. Electromagnetic flow rate adjustment changes the reciprocating frequency of the diaphragm. It can accept pulse frequency from a flow meter or analog signals of 4～20mA, and can also accept analog 4～20mA signals from water quality instruments, with the controller regulating dosing. Flow rate can be adjusted manually via buttons, or the dosing amount can be controlled by a controller (PID).

Sera pump maintenance

Centrifugal pump shutdown is mainly caused by mechanical seal failure. Failure mostly manifests as leakage, with the following causes: 1) Leakage at the sealing faces of the stationary and rotating rings, mainly due to: end face flatness and roughness not meeting requirements, or surface scratches; particulate matter between the end faces preventing uniform operation; improper installation or incorrect method. 2) Leakage of the compensating ring O-ring, mainly due to: gland deformation, uneven preload; incorrect installation; O-ring quality not meeting standards; incorrect O-ring selection. Actual usage shows that the most common failure point for sealing elements is the end faces of the stationary and rotating rings. Cracking of the centrifugal pump mechanical seal stationary and rotating ring end faces is a common failure phenomenon, mainly caused by: 3) Excessive gap at the sealing faces during installation, preventing the flushing fluid from removing heat generated by the friction pair in time; flushing fluid leaking through the sealing face gap, causing end face overheating and damage. 4) Vaporization and expansion of the liquid medium, forcing the two end faces apart due to vaporization expansion force; when the two sealing faces are forced together, the lubricating film is destroyed, causing end face surface overheating. 5) Poor lubricity of the liquid medium, combined with excessive operating pressure, causes asynchronous tracking rotation of the two sealing faces. For example, a high-speed pump with a speed of 20445r/min, a sealing face center diameter of 7cm, reaches a linear velocity of up to 75 m/s after operation. If one sealing face lags and cannot track the rotation, instantaneous high temperature causes sealing face damage. 6) Clogging of the seal flushing fluid orifice plate or filter screen, causing insufficient water flow and leading to mechanical seal failure.

Sera pump industry applications

Centrifugal pumps feature a compact structure, wide flow and head ranges, suitability for mildly corrosive liquids, multiple control options, uniform flow, smooth operation, and low vibration. They do not require special vibration-damping foundations. Equipment installation, maintenance, and repair costs are low. They are widely used in power, metallurgy, coal, building materials, and other industries for transporting slurries containing solid particles, such as hydraulic ash removal in thermal power plants, slurry transport in metallurgical beneficiation plants, and coal slurry and heavy medium transport in coal washing plants. When a centrifugal pump operates, it must be placed on land, with the suction pipe in water, and requires priming before startup. Sludge pumps and submersible centrifugal pumps are structurally limited; during operation, the motor must be placed above the water surface while the pump is submerged. Therefore, they must be fixed; otherwise, the motor falling into the water will cause motor failure. Moreover, since the long shaft length is generally fixed, pump installation and use are more troublesome, and application scenarios are subject to many restrictions.

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