1 前言常压热水锅炉有利于消除爆炸的危险,以其安全、经济、适应性强的特点,在北方地区广为使用。在常压热水锅炉采暖系统中,回水阻力的调节常采用截止阀或闸阀。一旦不慎扳动了阀门的手轮使回水阻力变大或变小,则锅炉会出现跑水现象或系统压力升高,而导致散热器、阀门等处出现泄漏。本文介绍采用孔板节流装置来代替回水阻力调节阀,它具有省工、省时、省钱等优点。 1 Introduction Atmospheric pressure hot water boiler is conducive to eliminating the danger of explosion, with its safety, economy, adaptability, widely used in the northern region. In the atmospheric hot water boiler heating system, the backwater resistance adjustment often use cut-off valve or gate valve. Once inadvertently pull the valve hand wheel so that the backwater resistance becomes larger or smaller, the boiler will appear running water phenomenon or system pressure, which led to the radiator, valves, etc. at the leak. This article describes the use of orifice throttling device to replace the backwater resistance control valve, which has the advantages of saving labor, saving time and money.