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原文：
Pressure vessels--including boilers, water heaters, compressed air tanks, and water pressure tanks--operate under internal pressure greater Butterfly Valves than the atmospheric pressure, and are required by codes to be equipped with pressure relief valves, also known as safety valves. The pressure relief valve in Photo 1 is on a hot water heating boiler. A properly installed pressure relief valve will be connected at the top of the boiler in an upright position (unless approved for use in other positions), using pipe and fittings of the same size as the inlet of the relief valve. No other valves are permitted between theGlobe Valves relief valve and the boiler. The pressure relief valve on a steam boiler is similar. Boilers with more than 500 square feet of heating surface may be required to have more than one pressure relief valve. The relief valve setting must be at or below the maximum allowable working pressure of the boiler. Its relieving capacity must be equal to or greater than the Safety valves boiler’s maximum rated heat input. The relief valve in Photo 1 is set to open at 30 pounds per square inch (psi) (2.109 kg/cm2), and is installed on a boiler with a maximum allowable working pressure of 30 psi. The relief valve in Photo 1 is rated at 1 million BTU per hour, whereas the boiler and burner are rated at 900,000 BTU per hour.
原文来自：http://www.fireengineering.com/index/articles/display/8962296719/articles/fire-engineering/construction-concerns/2009/12/construction-concerns0.html

Construction Concerns: Safety Valves;是由上海一环流体控制设备有限公司提供的阀门新闻，中文译文仅供参考(上海一环流体控制设备有限公司还生产气动调节阀自力式调节阀 CV3000调节阀执行器与附件通用阀门及防爆型高压电磁阀，高温电磁阀，二位三通电磁阀，双杠杆安全阀，空压机安全阀，欢迎您的选购。)
以下是参考译文：

译文：压力高于溢流阀的设定压力

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