شیر ایمنی دنده ای

Valve Image Site

 

شیر ایمنی دنده ای

Screw Safety valve

شیر ایمنی دنده ای: شير ایمنی دنده ای فشار يا PSV يكي از تجهيزات ايمني در صنعت است. كه مانع از قرار گرفتن لوله ها، شيرآلات، مخازن تحت فشار و… در شرايط فشاري بيش از فشار طراحي مي شود. بنابراين انتخاب PSV بسيار مهم بوده و بايد با احتياط كامل صورت پذيرد.
در انتخاب شیر ایمنی PSV و تعيين جزئيات آن چند سئوال مهم مطرح مي گردد:

چه نوع شیر ایمنی دنده ای براي فرآيند مورد نظر ما مناسب است؟

آيا روش ساده اي براي محاسبه سايز شیر ایمنی دنده ای وجود دارد كه راحت تر از محاسبات دستي باشد؟

چه نوع متريالي برای شیر ایمنی دنده ای بايد انتخاب گردد تا با شرايط فرآيندي مورد نظر هم خواني داشته باشد؟
قبل از پاسخ دادن به اين سوالات و نحوه انتخابPSV بهتر است با نحوه كار PSV آشنا شويم و آشنايي با قطعات اساسPSV به ما كمك خواهد كرد كه با آگاهي كامل اين انتخاب را انجام دهيم.

تعريف شير ایمنی فشار:

طبـق استـاندارد API 520 Part 1 كه به بررسي نحوه انتخاب، محاسبه سايز، نحوه نصب تجهيزات ایمنی در پالايشگاه ها مي پردازد. در مورد شير اطمينان تعريف زير ارائه شده است: يك شير ایمنی شيري است كه توسط يك فنر بسته شده است. و با رسيدن فشار پشت شير به يك فشار استاتيكي مشخص عمل كرده و به سرعت باز مي شود. (به اين عملPOP كردن شير مي گويند) شيرهاي ایمنی معمولاً براي سيالات تراكم پذير كاربرد دارد. با مشخص بودن مساحت سطح مجرابند و اندازه نازل مي توان مشخص نمود كه چه حجم سيال از شير خارج خواهد شد. در ابتدا بايد اندازه نازل خروجي (كه اُرفيس ناميده مي شود) محاسبه گردد.

 

انواع شیر ایمنی دنده ای:

  • شیر ایمنی دنده ای گاز
  • شیر ایمنی دنده ای درون چاهی
  • شیر ایمنی دنده ای سطحی
  • شیر ایمنی دنده ای پیلوت دار
  • شیر ایمنی دنده ای هوا
  • شیر ایمنی دنده ای بخار

انواع شیر ایمنی دنده ای با مارک های مختلف اعم از:

شیر ایمنی دنده ای لزر / شیر ایمنی Leser

شیر ایمنی دنده ای کروزبی / شیر ایمنی Crosby

شیر ایمنی دنده ای تکنیکال/ شیر ایمنی Technical

شیر ایمنی دنده ای کنسولیدیدت/ شیر ایمنی Consolidated

شیر ایمنی دنده ای هایسک/ شیر ایمنی Hisec

 

 

جهت دریافت اطلاعات بیشتر و اطلاع از قیمت شیر ایمنی دنده ای با کارشناس فروش شیرآلات شرکت تماس حاصل فرمایید.

 

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