After giving a brief analysis of pressure hazards and accident simulation methods, the authors introduce the system of European PED - EN system for pressure equipment in order to eliminate or reduce pressure hazards by studying 97/23/EC Pressure Equipment Directive and EN13445 Unfired Pressure Vessels and describe the impacts of PED - EN system on the ASME pressure vessel codes and the...

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Normally closed solenoid valve, coil power, the GATE VALVES armature under the action of electromagnetic force driving the first Vice-valve valve Seti, the main valve on the valve cup of fluid flow out through the Vice-valve, reducing the role of the main valve pressure on the valve cup, when the main valve valve to reduce pressure on the cup to a certain value, the armature driving the main valve valve cup, and use pressure Ershi main valve valve cup opening, medium flow.

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Coil power, the electromagnetic suction is zero, the Deputy valve valve plug and the dynamic role of the iron core because of spring brought up, the Deputy valve is opened, the main valve on the valve cup of fluid flow out through the SAFETY VALVES Vice-valve, reducing the role of the cup on the valve in the main valve pressure, when the main valve to reduce pressure on the valve cup to a certain value, the use of pressure to push the main valve valve cup, the solenoid valve is opened, media circulation.

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Lowers high blood pressure：降低血壓升高

Helps reduce the risk of coronary heart disease and stroke有助于減少患冠心病的風險,和中風 | Lowers high blood pressure降低血壓升高 | Helps reduce weight and body fat有助于降低體重和身體脂肪

Lowers high blood pressure：降低高血壓

Helps reduce the risk of coronary heart disease and stroke有助於減少風險,冠心病和中風 | Lowers high blood pressure降低高血壓 | Helps reduce weight and body fat有助於減少體重和身體脂肪

reduce peer pressure：減少來自同伴的壓力

promote safety and discipline 促進安全性和紀律性 | reduce peer pressure 減少來自同伴的壓力 | reflect students' respects to their teachers 反映了學生對老師的尊敬