Shower Room Ce RoHS Round 7W 14W LED Ceiling Light, LED Bulkhead

The key to our success is 'Good Products Good quality, Reasonable Value and Efficient Service' forsand slurry pump,Submersible pump,潜水器水泵湖雷竞技app下载网址雷竞技官网最新版. It is our customers' satisfaction over our products and services that always inspires us to do better in this business. Culture is the soul of an enterprise, and we are always guided by the values of 'integrity, responsibility, enterprising, and gratitude'. Our products are widely sold at home and abroad, and we have established long-term and good business relationships with many customers.

1. Valve adjustment

The simplest way to change the flow is to adjust the opening of the valve at the outlet, while the speed remains unchanged (generally rated speed), which is essentially to change the position of the pipeline characteristic curve to change the operating point . When the valve is closed, the local resistance of the pipeline increases, the working point moves to the left, and the corresponding flow decreases. When the valve is fully closed, the resistance is infinite and the flow is zero. At this time, the pipeline characteristic curve coincides with the ordinate. When the small valve is closed to control the flow, the water supply capacity itself and the head characteristics are unchanged, and the pipe resistance characteristics will change with the change of the valve opening. This method is easy to operate and has continuous flow. It can be adjusted between a certain maximum flow and zero at will without additional investment. It is widely used. But throttling regulation is to consume the excess energy of the sewage pump to maintain a certain supply, and the efficiency will also decline, which is not reasonable economically.

2. variable frequency speed regulation

The deviation of operating point from high efficiency area is the basic condition of speed regulation. When the rotation speed changes, the valve opening remains unchanged (usually the maximum opening), the pipeline system characteristics remain unchanged, and the water supply capacity and head characteristics change accordingly.

When the required flow is less than the rated flow, the head of variable frequency speed regulation is smaller than the valve throttle, so the water supply power required by variable frequency speed regulation is smaller than the valve throttle. Obviously, compared with valve throttling, the energy-saving effect of frequency control is outstanding, and the working efficiency of sewage pump is higher. In addition, the frequency conversion speed regulation can not only reduce the possibility of cavitation of the sewage pump, but also extend the start-up / shutdown process by preset the speed up / speed down time, so as to greatly reduce the dynamic torque, so as to largely eliminate the destructive water hammer effect, and greatly extend the life of the water pump and pipeline system.

In fact, frequency conversion speed regulation also has limitations. In addition to large investment and high maintenance cost, when the speed is too large, it will cause efficiency reduction, which is beyond the scope proportion law, so it is impossible to adjust speed without limitation.

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