1,氣動調(diào)節(jié)閥的工作原理:氣動調(diào)節(jié)閥由執(zhí)行機構(gòu)和調(diào)節(jié)機構(gòu)組成。執(zhí)行機構(gòu)是調(diào)節(jié)閥的推力部件,它按控制信號壓力的大小產(chǎn)生相應(yīng)的推力,推動調(diào)節(jié)機構(gòu)動作。閥體是氣動調(diào)節(jié)閥的調(diào)節(jié)部件,它直接與調(diào)節(jié)介質(zhì)接觸,調(diào)節(jié)該流體的流量。
2.公稱壓力:(Nominal pressure),表示符號PN,在一定溫度下應(yīng)用時允許的zui大工作壓力。對碳鋼閥體的控制閥,指200℃以下應(yīng)用時允許的zui大工作壓力;對鑄鐵閥體,指120℃以下應(yīng)用時允許的zui大工作壓力;對不銹鋼閥體的控制閥,指250℃以下應(yīng)用時允許的zui大工作壓力。當工作溫度升高時,閥體的耐壓會降低。
例如,公稱壓力為6.4MPa(PN64)的碳鋼控制閥,用于300℃時的耐壓為5.2MPa,用400℃時的耐壓為4.1MPa,用于450℃時的耐壓為2.9MPa。因此,控制閥公稱壓力的確定不僅要根據(jù)zui高工作壓力,還需根據(jù)zui高工作溫度和材質(zhì)特性,而不僅僅只需滿足公稱壓力大于工作壓力

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