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1. Advantages and disadvantages of Smith scraper flowmeter
Smith scraper flowmeter (Positive Displacement RotaryVane Meter) is composed of a scraper measuring chamber and a double-layer shell under pressure, which can maintain the factory processing accuracy in working state and ensure that the product measurement accuracy does not change with environmental changes. The straight through shell and rotating scraper ensure a large drainage volume, and are widely used in inventory control and settlement of important trade occasions such as crude oil, finished oil, solvents, chemicals, paints, fertilizers, and food. Feature ■ Excellent accuracy - Following the Rotary Vane principle, with a specially designed instrument measuring chamber, the pressure difference between the inlet and outlet is minimized across the measuring chamber, and the medium flow is optimized through the instrument, ensuring instrument accuracy. Extremely low pushing pressure - The latest flow path design provides extremely low pushing pressure. ■ Extremely high instrument repeatability - instrument repeatability reaches 0.05%. ■ Extremely long service life - The instrument adopts low friction ball bearings and a fixed path cam bracket, which enables the scraper to operate accurately according to the predetermined trajectory, ensuring long-term service life.
2. What are the classifications of water pumps?
Classification of water pumps
1. According to the direction of the pump shaft, it can be divided into horizontal, vertical, and inclined
2. According to the type of shell splitting, it can be divided into radial splitting and axial splitting
3. According to the number of stages, it can be divided into single-
4. According to the suction form, it can be divided into single suction and double suction
5. According to the form of the water pump, it can be divided into various center support types, pipeline type, common seat type, split seat type, and movable
6. According to the driving mode, it can be divided into direct connection, gear transmission type, liquid coupling transmission type, and skin constant transmission multimodal type 7. According to special structures, it can be divided into submerged, cylindrical, double walled shell, pit tube, extraction, self-priming, submersible, and shielding types. 8. According to axial force balancing methods, it can be divided into balanced drum, balanced disc, self balancing, and balance hole types. 9 According to different purposes, it is mainly divided into boiler feed water pump, circulating water pump, sewage pump, impurity pump, sand pump, slurry pump, mud pump, sewage pump, clean water pump, fire pump, process pump, booster pump, corrosion-resistant pump. 10. According to different materials, it is divided into cast iron pump, stainless steel pump, plastic pump, fluoroplastic pump, engineering plastic pump. 1. According to the structural form, it is divided into centrifugal pump, diaphragm pump, gear pump, plunger pump, reciprocating pump, vacuum pump, jet pump. 3. Positive displacement flowmeter?
Positive displacement flowmeter, also known as PD flowmeter or PDF, is the most accurate type of flow meter. It uses mechanical measuring elements to continuously divide the fluid into individual known volume parts, and measures the total flow volume based on the number of times the measuring chamber sequentially and repeatedly fills and
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