เมื่อต้องเลือกวาล์วที่เหมาะสมสำหรับการใช้งานในอุตสาหกรรมของคุณ มีหลายปัจจัยที่ต้องพิจารณา การตัดสินใจสำคัญประการหนึ่งที่คุณต้องทำคือว่าจะใช้วาล์วแบบนั่งอ่อนหรือวาล์วแบบโลหะ วาล์วทั้งสองประเภทมีข้อดีและข้อเสียที่แตกต่างกัน และการทำความเข้าใจสิ่งเหล่านี้สามารถช่วยให้คุณตัดสินใจได้อย่างมีข้อมูล

วาล์วแบบนั่งนุ่มได้รับการออกแบบด้วยวัสดุอ่อน เช่น ยางหรือ PTFE บนพื้นผิวซีล วัสดุเนื้อนุ่มนี้ให้การซีลที่แน่นหนาเมื่อปิดวาล์ว เพื่อป้องกันการรั่วไหลของของเหลว ข้อดีหลักประการหนึ่งของวาล์วแบบตั้งพื้นแบบอ่อนคือความสามารถในการปิดแบบไร้ฟอง ซึ่งถือเป็นสิ่งสำคัญในการใช้งานที่แม้แต่การรั่วไหลเพียงเล็กน้อยก็อาจทำให้เกิดปัญหาได้

[ฝัง]http://shchimay.com/wp-content/uploads/2023/11/MF2-two-tons-manual.mp4[/embed]

ข้อดีอีกประการหนึ่งของวาล์วนั่งแบบอ่อนคือความสามารถในการจัดการกับของเหลวหลากหลายประเภท รวมถึงสารที่มีฤทธิ์กัดกร่อนและมีฤทธิ์กัดกร่อน วัสดุที่อ่อนนุ่มบนพื้นผิวซีลจะช่วยปกป้องวาล์วจากความเสียหายที่เกิดจากสารเคมีรุนแรงเหล่านี้ ช่วยยืดอายุการใช้งานของวาล์ว

วาล์วแบบนิ่มยังต้องการการบำรุงรักษาน้อยกว่าเมื่อเทียบกับวาล์วแบบแบบโลหะ วัสดุที่อ่อนนุ่มบนพื้นผิวซีลมีโอกาสสึกหรอน้อยกว่า ทำให้ไม่จำเป็นต้องเปลี่ยนหรือซ่อมแซมบ่อยครั้ง ซึ่งอาจส่งผลให้ประหยัดต้นทุนเมื่อเวลาผ่านไป ทำให้วาล์วแบบตั้งพื้นแบบอ่อนเป็นตัวเลือกที่ประหยัดกว่าสำหรับการใช้งานบางประเภท

อย่างไรก็ตาม วาล์วแบบตั้งพื้นแบบอ่อนก็มีข้อเสียเช่นกัน ข้อเสียเปรียบหลักประการหนึ่งคือความสามารถด้านอุณหภูมิและแรงดันที่จำกัด วัสดุอ่อนสามารถสลายตัวได้ที่อุณหภูมิสูงหรือภายใต้แรงดันสูง ซึ่งอาจส่งผลต่อประสิทธิภาพการซีลของวาล์ว ซึ่งหมายความว่าวาล์วแบบนิ่มอาจไม่เหมาะสำหรับการใช้งานที่ต้องการอุณหภูมิหรือสภาวะความดันสูงเกินไป

วาล์วแบบนิ่มมีแนวโน้มที่จะเกิดความเสียหายจากอนุภาคในของเหลวมากกว่า วัสดุที่อ่อนนุ่มบนพื้นผิวซีลอาจเสียหายได้ง่ายจากอนุภาคของแข็ง ทำให้เกิดการรั่วไหลและลดประสิทธิภาพ ซึ่งหมายความว่าวาล์วแบบตั้งพื้นแบบอ่อนอาจไาะสำหรับการใช้งานที่ของไหลมีของแข็งที่มีความเข้มข้นสูง

ในทางตรงกันข้าม วาล์วแบบตั้งด้วยโลหะได้รับการออกแบบให้มีพื้นผิวซีลระหว่างโลหะกับโลหะ ซึ่งให้การซีลที่ทนทานและแข็งแกร่งมากกว่าเมื่อเปรียบเทียบกับวาล์วแบบนั่งแบบอ่อน บ่าวาล์วที่เป็นโลหะสามารถทนต่ออุณหภูมิและความดันที่สูงขึ้นได้ ทำให้เหมาะสำหรับการใช้งานที่ต้องใช้สภาวะที่รุนแรง

วาล์วบ่าแบบโลหะยังทนทานต่อความเสียหายจากอนุภาคในของเหลวได้ดีกว่าอีกด้วย พื้นผิวซีลโลหะมีโอกาสสึกหรอน้อยกว่าจากอนุภาคของแข็ง ทำให้วาล์วมีอายุการใช้งานยาวนานขึ้น ทำให้วาล์วแบบตั้งโลหะเป็นตัวเลือกที่เชื่อถือได้มากขึ้นสำหรับการใช้งานที่ของเหลวมีของแข็ง

อย่างไรก็ตาม วาล์วแบบตั้งโลหะมีแนวโน้มที่จะรั่วไหลมากกว่าเมื่อเทียบกับวาล์วแบบตั้งพื้นแบบอ่อน การผนึกระหว่างโลหะกับโลหะอาจไม่ให้การผนึกแน่นเท่ากับวัสดุอ่อนบนวาล์วแบบอ่อน ซึ่งอาจนำไปสู่การรั่วไหลได้ นี่อาจเป็นข้อกังวลในการใช้งานที่ไม่สามารถยอมรับการรั่วไหลได้รุ่น

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Metal seated Valves also require more maintenance compared to soft seated valves. The metal sealing surface is more prone to wear and corrosion, requiring regular inspections and replacements to ensure proper performance. This can result in higher maintenance costs over time, making metal seated valves a less economical choice for some applications.

In conclusion, both soft seated valves and metal seated valves have their own set of pros and cons. Soft seated valves offer a tight seal, resistance to corrosive fluids, and lower maintenance requirements, while metal seated valves provide durability, high temperature and pressure capabilities, and resistance to solid particles. The choice between the two types of valves will depend on the specific requirements of your application and the trade-offs you are willing to make.