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Centrifugal pump at the inlet of the liquid in the impeller at work because of a certain vacuum pressure will produce gas, liquid vaporization under the bubbles in the liquid particle collision movement of impeller of metal surface spalling, undermining the impeller of metal, the vacuum pressure is called vaporization pressure, cavitation allowance is refers to the unit weight at the entrance of pump suction fluid possesses more than vaporization pressure of surplus energy. The unit is m liquid column, with (NPSH) r said. Suction is the necessary NPSH Δ/h: : suck liquid vacuum pump allowed, i.e. pump allows geometric installation height. Unit from rice. = standard atmospheric pressure suction (10.33 m) - cavitation allowance - piping losses - security amount (0.5) on the standard atmospheric pressure can vacuum pipeline height 10.33 meters. Allow NPSH is produced to prevent cavitation, centrifugal pump imports of dynamic and static pressure head must be greater than the sum of the liquid in the value of the operating temperature of saturated steam pressure head, the lower pump inlet to allow the lower the head, of course, the better the cavitation resistant capacity.

Much starker choices-and graver consequences-in planning is about to start, environmental pump market background, policy good release ceaselessly, make Hujing pump industry veteran power companies such as conveniently rise, cling to the Internet wave, smooth transformation and upgrading, product also turned to high-end market, in the pump industry occupy a larger market share, brand value and get maximum play, achieve fame and fortune. "Twelfth five-year" period, the state shall, in accordance with the new growth point of national economy and the pillar industry to support of environmental protection industry, including the three major support of traditional environmental protection industry key: the construction of urban sewage and garbage disposal facilities engineering, the key sources of pollution control engineering and cleaner production demonstration project, kept increasing policy support, make environmental protection reached a peak pump up to the market demand. Environmental protection much starker choices-and graver consequences-in has been gaining momentum, pump and develop as you can imagine the future of the industry. In recent years, domestic pump industry enterprises, by means of combination of independent innovation to develop a batch of products with independent intellectual property rights, basic can meet the requirements of domestic related device for pump products. At the same time, conveniently rise Hujing pump industry veteran power companies such as, become a powerful engine booster pump industry long-term development. "Public data shows, in the sewage treatment equipment, water pump class accounts for about 15% of the mechanical equipment total investment. Calculated in proportion," twelfth five-year "period, in the field of urban sewage treatment pump products demand will be in 60 billion yuan or so, the future market demand, there are nearly 40 billion of the three years' much starker choices-and graver consequences-in open market space as an order of magnitude, pump industry market prospect is very considerable." Hujing, head of the pump industry. Company of machining, hot and cold processing, investment casting, scientific research production, production equipment, physical and chemical testing and detection means is complete, the pump performance test bed with 380 v, 6 kv, 10 kv high and low pressure testing capability, specializing in the production of "Hujing" brand stainless steel corrosion resistance, abrasion resistance and chemical centrifugal pump and non-metal fluorine plastic pump to be the star of the domestic market leading products, popular customer trust. In recent years, affected by the policy market positive, Hujing pump industry pay attention to the structure optimization of product chain, a high standard of large flow product proportion increase, greatly expand the profit space. The main products such as centrifugal pump, plastic pump series downstream demand is relatively stable, accounted for in the company's business is still not small, market share growth quickened, there is still a large room to improve. According to the company, the company is currently in the layout of the high-end water pump products, relying on high-quality product quality and reserves, has been formed echelon, is in a high-speed growth period, even if the situation is slightly nervous, still can support the steady growth of company equipment business as a whole. Wine is also afraid of deep alley. Hujing pump industry strict on product and service, do not forget the implementation of the marketing strategy, marketing network across the country has become an important support of the company's diversified layout. Especially in the rapid advance of "Internet +" spring tide, seize new opportunities, also become traditional pump industry through difficult overweight was crucial to the development of power. According to Hujing, head of the pump industry analysis, Internet marketing is an inevitable trend for social economy. With China's environmental protection industry's leading e-commerce platform, Chinese environmental cooperation process, the online Hujing pump industry gain more targeted customers effectively, enterprise value unceasingly thoroughly dependent increase consumers' brand, break the traditional pattern of promotion, online multi-channel platform for the company truly "going out", in the pump industry occupy a larger market share, maximizes the brand value, and his reputation.

Because most of the centrifugal pump adopts mechanical seal, as long as idle for a few seconds, the mechanical seal friction pair will generate friction high temperature lead to face failure, o-rings are high temperature burning, some serious fluorine pump will melt pump shaft and pump cover sleeved layer. Magnetic pump fluid when idling, sliding bearing is not cooling, produce high temperature result in sliding bearing damage. The centrifugal pump is strictly forbidden without medium idling, before starting must be filled with liquid.