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安全閥開啟壓力調(diào)整有哪些要求？

更新時間：2019-04-28

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　　安全閥開啟壓力調(diào)整有哪些要求？

　　開啟壓力的調(diào)整:

　?、侔踩y出廠前，應(yīng)逐臺調(diào)整其開啟壓力到用戶要求的整定值。若用戶提出彈簧工作壓力級，則按一般應(yīng)按壓力級的下限值調(diào)整出廠。

　?、谑褂谜咴趯踩y安裝到被保護(hù)設(shè)備上之前或者在安裝之前，必須在安裝現(xiàn)場重新進(jìn)行調(diào)整，以確保安全閥的整定壓力值符合要求。

　?、墼阢懪谱⒚鞯膹椈晒ぷ鲏毫壏秶鷥?nèi)，通過旋轉(zhuǎn)調(diào)整螺桿改變彈簧壓縮量，即可對開啟壓力進(jìn)行調(diào)節(jié)。

　　④在旋轉(zhuǎn)調(diào)整螺桿之前，安全閥應(yīng)使閥進(jìn)口壓力降低到開啟壓力的 90%以下，以防止旋轉(zhuǎn)調(diào)整螺桿時閥瓣被帶動旋轉(zhuǎn)，以致?lián)p傷密封面。

　?、轂楸ＷC開啟壓力值準(zhǔn)確，應(yīng)使調(diào)整時的介質(zhì)條件，如介質(zhì)種類、溫度等盡可能接近實際運(yùn)行條件。介質(zhì)種類改變，特別是當(dāng)介質(zhì)聚積態(tài)不同時（例如從液相變?yōu)闅庀啵?，開啟壓力常有所變化。工作溫度升高時，開啟壓力一般有所降低。故在常溫下調(diào)整而用于高溫時，常溫下的整定壓力值應(yīng)略高于要求的開啟壓力值。高到什么程度與閥門結(jié)構(gòu)和材質(zhì)選用都有關(guān)系，應(yīng)以制造廠的說明為根據(jù)。

　?、?strong>安全閥常規(guī)安全閥用于固定附加背壓的場合，當(dāng)在檢驗后調(diào)整開啟壓力時（此時背壓為大氣壓），其整定值應(yīng)為要求的開啟壓力值減去附加背壓值。

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安全閥開啟壓力調(diào)整有哪些要求？

安全閥開啟壓力調(diào)整有哪些要求？