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Micro-pumps because of its more features, can be used for cooling water circulation, it is often referred to as micro-circulation pump. It has one out of the pumping port, a drainage outlet, and at the inlet can continue to form a vacuum or negative pressure; drainage outlet to form a greater output pressure; working medium is water or liquid; a compact instrument. There are also called "micro-liquid pumps, micro-pump, mini-pump". Miniature working principle: the motor's circular motion, through the mechanical device to reciprocate the diaphragm within the pump to compress, stretch the pump cavity (fixed volume) of the air, the role of the one-way valve, formed at the drain Positive pressure (the actual output pressure with the pump drain by the booster and the characteristics of the pump); in the suction port to form a vacuum, resulting in pressure difference with the outside world pressure. Under the effect of pressure difference, the water is pressed into the water inlet and discharged from the water outlet. Under the action of kinetic energy transferred by the motor, the water continuously inhales and discharges to form a relatively stable flow rate. Selection criteria exactly what criteria to choose? According to the following principles to choose. First, the working medium at room temperature (0-50 ℃), simply pumping water or solution, without water and gas dual-use, but requires self-absorption capacity, and the flow and output pressure requirements. NOTE: The pumping medium is water, non-oily, not strong corrosive liquid solution (can not contain solid particles, etc.), there must be self-priming function, you can choose the following pumps: BSP, CSP1, flow requirements ~ 20L / min), the pressure is not demanding (about 1 to 3 kg), mainly used for water recycling, water sampling, upgrading, etc., require noise, long life, high self-priming suction, ASP, HSP2, low flow rate (about 1 ~ 5L / min), but the pressure (about 2 ~ 11 kg), mainly used for spraying, pressurization, car washing, etc. do not need long hours of work under high pressure or large Load, you can choose other series; ASP series 3, for the tea table pumping, spraying, etc., the required volume as small as possible, the flow requirements of small noise (about 0.1 to 3 liters / minute) Working medium at room temperature (0-50 ℃), the need for pumping water or gas (water or gas may be mixed or idle, dry turn occasions), value the volume, noise, continuous use and other properties. Description: Requires water and gas dual-use, can be long-term dry turn, do not damage the pump; 24 hours of continuous operation; particularly small size, low noise, but the flow, pressure less demanding. 1, with a mini pump or vacuum pump, but sometimes there will be liquid water into the pump chamber. 2, require micro-pump both pumping and pumping. 3, with a miniature pump, but sometimes there may be no pumping pump, in the "dry turn" state. Some traditional pumps fear "dry turn", "dry turn" can even damage the pump. The WKA series is essentially a compound function pump, which integrates the functions of vacuum pumps and pumps, some people call it "vacuum pump." So, in the absence of water, it will be evacuated, and when it has water it will pump it. Whether pumping or pumping state, belong to the normal work category, it does not matter "dry turn" damage. 4, the main pump with a micro-pump, but do not want to manually increase by pumping water before the "diversion" (some pumps in the work before the need to manually add some "diversion", so that the pump can pump up the water down, or the pump can not pump water or even Damage), that is, I hope the pump has "self-absorption" function. At this point you can choose PHW, WKA series products, their strength is that: In the absence of access to water, it is a vacuum, the formation of a vacuum by air pressure up, and then began pumping. WKA series. With the above applications, you can choose three, high temperature working medium (0-100 ℃), such as miniature pumps for water circulation cooling, water cooling, or pumping high temperature, high temperature steam, high temperature liquid, you must use a micro-pump Type) Caixing: 1. Temperature: 50-80 ℃, you can choose micro-gas dual-use WKA series of high temperature medium type, the maximum temperature is 80 ℃ or 100 ℃ temperature; 2. If the temperature at: 50- 100 ℃, you must choose the WKA series of high temperature medium type, the maximum temperature is 100 ℃; Fourth, the flow of greater demand (more than 20 liters / minute), but the medium contains a small amount of oil, solid particles, residues, etc. . Description: The media to be pumped, 1, contains a small number of smaller soft solid particles (eg, fish excrement, sewage sludge, debris, etc.), but the viscosity can not be too large, and it is best not to have a hair 2, allowing the working medium containing a small amount of oil (for example, a small amount of oil floating on the surface of the sewage), but not all oil! 3, larger flow requirements (more than 20 liters / minute): FSP large flow series. (1) Do not need to self-priming function of the occasion, and the pump can not be placed in water, solid particles can be cut into smaller particles: You can choose (2) do not need self-priming, and the pump can be placed in water, the optional micro Submersible pump QZ (medium flow 35-45 liters / minute), QD (large flow 85-95 liters / minute), QC (large flow 135-145 liters / minute) three series of submersible submersible pumps, DC submersible pumps.