1、Classification of Stainless Steel Gate Valves: 2、Advantages of Stainless Steel Gate Valve: 1. It has low fluid resistance, the sealing surface is little scoured and eroded by the medium; 2. Opening and closing is labor-saving; 3. The flow direction of media is unrestricted; 4. Good manufacturing technology, reliable sealing performance, corrosion resistance and wide application range. 3、Disadvantages of Stainless Steel Gate Valve: 1. It is easy to cause erosion and scratch between sealing surfaces； 2. The overall dimension is large, so it needs a certain space for opening, the opening and closing time is long； 3. Complex structure. 4、Precautions for Installation of Stainless Steel Gate Valve: 1. It is generally installed horizontally in the pipeline; 2. Hand wheel, handle and transmission mechanism are not allowed to be used for lifting, and collision is strictly prohibited; 3. The bypass valve should be opened before the gate valve with bypass valve is opened (To balance the pressure difference between the inlet and outlet and reduce the opening force); 4. The gate valve with transmission mechanism should be installed according to the provisions of the product operation manual; 5. If the valve is opened and closed frequently, lubricate it at least once a month.

Butterfly valves are divided into concentric butterfly valve, single eccentric butterfly valve, double eccentric butterfly valve and three eccentric butterfly valve. What are the main differences between these four butterfly valves? Now, Dervos will introduce to you: 1. Concentric Butterfly Valve (Midline Butterfly Valve) The structural feature of the concentric butterfly valve is that the valve stem axis, the center of the butterfly plate and the center of the body are in the same position. It has the advantages of simple structure and convenient manufacture. The disadvantage is that the butterfly plate and valve seat are always in the state of extrusion and scratch, with large resistance distance and fast wear. In order to overcome extrusion and scratch and ensure sealing performance, the valve seat basically adopts elastic materials such as rubber or polytetrafluoroethylene, but the use of sealing materials is limited by temperature. 2. Single Eccentric Butterfly Valve The structural feature of the single eccentric butterfly valve is that the axis of the valve stem deviates from the center of the butterfly plate, so that the upper and lower ends of the butterfly plate no longer become the rotation axis, which disperses and reduces the excessive extrusion between the upper and lower ends of the butterfly plate and the valve seat, and solves the extrusion problem between the butterfly plate and the valve seat of the concentric butterfly valve. However, the scratch phenomenon between the butterfly plate and the valve seat has not disappeared in the whole opening and closing process of the valve. Therefore, the application range of single eccentric butterfly valve is similar to concentric butterfly valve, and there are few applications. 3. Double Eccentric Butterfly Valve The double eccentric butterfly valve is further improved on the basis of the single eccentric butterfly valve. Its structural feature is that the axis of the valve rod deviates from the center of the butterfly plate and the center of the body. The effect of double eccentricity enables the butterfly plate to leave the valve seat immediately after the valve is opened, which greatly eliminates the unnecessary excessive extrusion and scratch between the butterfly plate and the valve seat, reduces the opening resistance and wear, improves the service life of the valve seat. The scratch is greatly reduced, so that the double eccentric butterfly valve can adopt metal seat, which improves the application of butterfly valve in high temperature field. However, the sealing effect is produced by the elastic deformation caused by the extrusion of butterfly plate and valve seat. It has high requirements for the closing position (especially the metal valve seat), low pressure bearing capacity and large leakage. 4. Three Eccentric Butterfly Valve To withstand high temperature, hard seal must be used, but the leakage is large; to achieve zero leakage, soft seal must be used, but it is not resista...

صمام السدادة هو أحد أقدم الصمامات المستخدمة بهيكل بسيط , فتح وإغلاق سريعان ومقاومة منخفضة للسوائل . صمامات السدادة العادية محكمة الغلق بالتلامس المباشر بين جسم السدادة المعدني النهائي وجسم الصمام , الذي يحتوي على عيوب الختم الضعيف , قوة الفتح والإغلاق الكبيرة وسهولة التآكل . يمكن استخدامها فقط في انخفاض (ليس أعلى من 1 ميجا باسكال) وقطرها الصغير (أقل من 100 مم) . من أجل توسيع نطاق تطبيق صمام السدادة , تم تطوير العديد من الهياكل الجديدة . يعتبر صمام سدادة مانع تسرب الزيت أهم واحد . يتم حقن شحم خاص من أعلى جسم السدادة بين الفتحة المستدقة في جسم الصمام وجسم السدادة لتشكيل فيلم زيت لتقليل عزم الفتح والإغلاق وتحسين أداء الختم وعمر الخدمة . يمكن أن يصل ضغط التشغيل إلى 64 ميجا باسكال , ويمكن أن تصل درجة حرارة التشغيل القصوى إلى 325 درجة مئوية , ويمكن أن يصل الحد الأقصى للقطر إلى 600 مم . الجزء المغلق من صمام التوصيل عبارة عن أسطوانة بها فتحات , والتي تدور حول المحور العمودي على القناة , وذلك لفتح وإغلاق القناة . مزايا صمام سد: 1 . سهل للتشغيل المتكرر , فتح وإغلاق سريع ؛ 2 . مقاومة منخفضة للسوائل ؛ 3 . هيكل بسيط , حجم صغير نسبيًا , خفيف الوزن وسهولة الصيانة ؛ 4 . أداء الختم الجيد ؛ 5 . اتجاه التثبيت غير مقيد , يمكن أن يكون اتجاه تدفق الوسائط عشوائيًا ؛ 6 . لا اهتزاز وضجيج منخفض . تصنيف سد الصمامات: 1 . حسب الهيكل: صمام سدادة محكم الضبط , صمام سدادة ذاتية الغلق , صمام سدادة توازن الضغط وصمام سدادة مانع تسرب الزيت ؛ 2 . عن طريق القناة: صمام سدادي مستقيم , صمام سدادة ثلاثي الاتجاه وصمام سدادة رباعي الاتجاه . تتميز قناة الصمام السدادي بأشكال عديدة . النوع المشترك المستقيم يستخدم بشكل أساسي لقطع السائل ؛ صمام سدادي ثلاثي وأربعة اتجاهات مناسب لعكس السوائل .