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1. The electric leakage protection device The electric leakage protection device to keep electric leakage from pulling to touch the danger. 2. Fine inner container of particular steel material and powder porcelain coat (barrel) Porcelain can prevent inner container from being rotten, keep water from contacting directly the iron part of the barrel and get rust or eroded by impurity in water so as to prolong the usage. Particular steel material and welding with argon at the joints, can endure a water pressure of 14kg/cm2; besides, during destroying experiment, it can bear a working pressure of 21kg/cm2. During the longevity experiment, 250 000 recycled tests are performed over 10kg/cm2. 3. Fine powder static coat and magnesium protection can prolong the usage of inner container. The density of powder porcelain is more than six times of that of wet porcelain; the particular static porcelain has a membrane with equal thickness. Its quality is better than that of wet porcelain through some tests, such as surface attack endurance, power tension, (1.5V) and tension endurance, etc. With magnesium stick as addition, anti erosion stuffing, plus the advantage of powder porcelain, the longevity of inner container can be extended to over six years. 4. PU vesicant with high density is very efficient in keeping warmth. PU vesicant with a heat insulation and warmth keeping layer thicker of 50 mm can keep the warmth two times longer than a general glass fiber, so as to save energy resource. 5. Double control valve of temperature and pressure to assure the security Fix the water tension at 10kg/cm2. If the tension surpasses this value, water will be leaked automatically. And if the temperature is over than the fixed one, tension will be reduced automatically. Thus, double protection effect is achieved. 6. Automatic control of constant temperature 7. Arrange the design of the dirty value.
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