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How to Install the Valve Gasket?
How to Install the Valve Gasket?
2023-06-07

Sealing gasket is a commonly used sealing spare part for machinery, equipment, etc. It is a material that plays a sealing role. Correct installation can ensure sealing performance and smooth operation of the equipment, otherwise it will damage the sealing gasket. Next, let's take a specific look at what to do. The correct installation of gaskets should be carried out when the flange connection structure or threaded connection structure, sealing surface, and gasket have been inspected without any doubt, and other valve components are intact and undamaged. 1. Before installing the gasket, apply a layer of graphite powder or lubricant mixed with engine oil (or water) to the sealing surface, gasket, thread, and rotating parts of the bolt and nut. The gasket and graphite should be kept clean. 2. The gasket should be installed on the sealing surface in a moderate and correct manner, without deviation, and should not extend into the valve chamber or rest on the shoulder. 3. Only one gasket is allowed to be installed, and it is not allowed to install two or more gaskets between the sealing surfaces to eliminate insufficient clearance between the two sealing surfaces. 4. The sealing of elliptical gaskets should ensure that the inner and outer rings of the gasket come into contact, and the two ends of the gasket should not come into contact with the bottom of the groove. 5. The installation of the O-ring should not only meet the design requirements for the ring and groove, but also have an appropriate amount of compression. On the premise of ensuring sealing, the smaller the compression deformation rate, the better, which can extend the service life of the O-ring. 6. Before installing the gasket, the valve should be in the open position to avoid affecting installation and damaging the valve components. When covering, it should be aligned with the position and should not be pushed or pulled into contact with the gasket to avoid displacement and scratches on the gasket. 7. The installation of gaskets for bolted or threaded connections should ensure that the gaskets are in a horizontal position (threaded gaskets with wrench positions should not be used with pipe wrenches). 8. Before tightening the gasket, it is necessary to have a clear understanding of the pressure, temperature, properties of the medium, and material characteristics of the gasket to determine the pre tightening force. The preload should be minimized as much as possible without leakage during pressure testing. 9. After tightening the gasket, it is necessary to ensure that there is a pre tightening gap between the connecting parts in case of gasket leakage. 10. When working at high temperatures, bolts will experience high-temperature creep, stress relaxation, and increased deformation, leading to leakage at the gasket and requiring hot tightening. On the contrary, under low temperature conditions, bolts will shrink and require cold loosening. 11. When liquid sealing gaskets are used for sealin...

ما هو الفرق بين صمام البوابة وصمام الكرة الأرضية؟
ما هو الفرق بين صمام البوابة وصمام الكرة الأرضية؟
2023-05-31

يعتقد الكثير من الناس أن كلاً من صمامات البوابة وصمامات الكرة الأرضية لها وظيفة قطع الوسائط ، لذلك لا تختلف عند استخدامها. في الواقع ، هناك اختلافات معينة بين صمامات البوابة وصمامات الكرة الأرضية في التطبيقات العملية. Gate Valve and Structural Diagram Globe Valve and Structural Diagram 1. Having different structures. Gate valves are more complex in structure, higher in height, and larger in size than globe valves. Gate valves are shorter and higher in appearance than globe valves. Especially, opening the stem gate valve requires a higher height. If the installation position of the valve is limited, it is necessary to choose rising stem and non-rising stem gate valves and remind everyone to pay attention. 2. When fully open, it has different flow resistance. The flow resistance coefficient of ordinary gate valves is approximately 0.08~0.12. The pressure loss during the operation of the gate valve medium is small, and the fluid flow resistance is small. Gate valves are usually suitable for working conditions where frequent opening and closing are not required and the gate is kept fully open or closed. It is not suitable for adjustment and throttling. The resistance coefficient of a regular globe valve is about 3.5-4.5, and the opening and closing forces are very small. The flow resistance of the shut-off valve throughout its entire stroke is very high, and the required driving force or torque is also much greater. But it is very suitable for regulation and throttling. 3. The flow direction of the medium inside the valve body is different. Gate valves have the same effect when viewed from both sides. When installing a shut-off valve, the medium can enter from below and above the valve core. 4. The sealing surface of the gate valve has a certain degree of self-sealing ability. The valve core is in close contact with the sealing surface of the valve seat through medium pressure, achieving sealing performance and no leakage. The sealing surfaces of the shut-off valve only come into contact with each other when fully closed, and the relative sliding amount between the forcibly closed valve core and the sealing surface is very small, so the wear of the sealing surface is also very small. 5. The maintenance procedures are different. The maintenance of gate valves is not applicable to on-site pipelines, but the seat and disc of most globe valves can be replaced online without the need to remove the entire valve from the pipeline (when the valve is not under pressure). This is very suitable for situations where valves and pipelines are welded together. Gate and globe valves are both fully open and fully closed valves. When selecting valves in the application process, attention should be paid to the characteristics of the valves. Globe valves are usually used for small pipelines and

تكنولوجيا المعالجة والخصائص الهيكلية لصمام الفراشة ذو الختم الصلب الثلاثي غريب الأطوار
تكنولوجيا المعالجة والخصائص الهيكلية لصمام الفراشة ذو الختم الصلب الثلاثي غريب الأطوار
2023-05-24

صمام الفراشة ذو الختم الصلب الثلاثي اللامركزي ، كصمام عالي الأداء ، له مزايا مثل مقاومة التآكل ، الختم الموثوق به ، وعزم الدوران الصغير للفتح. سطحه المحكم هو سطح مخروطي مائل ، والاتصال بين حلقة إحكام إغلاق جسم الصمام وحلقة إحكام تجميع لوحة الفراشة هي ملامسة السطح. مبدأ عملها هو قيادة مجموعة لوحة الفراشة مباشرة عن طريق عزم دوران جهاز القيادة ، مما يتسبب في اتصال حلقة الختم الخاصة بمجموعة لوحة الفراشة بشكل كامل بحلقة إحكام إغلاق جسم الصمام وتوليد تشوه مرن للختم. الخصائص الهيكلية 1. The hard sealed butterfly valve adopts a three eccentric hard sealing structure, with almost no wear on the valve seat and butterfly plate, and has a sealing function that becomes tighter as the valve is closed. 2. The sealing ring is made of stainless steel, which has the dual advantages of metal hard sealing and elastic sealing. Both at low and high temperatures, it has excellent sealing performance, corrosion resistance, and long service life. 3. The sealing surface of the butterfly plate adopts surfacing cobalt based hard alloy, which is wear-resistant and has a long service life. 4. The large-sized butterfly plate adopts a quilted frame structure, with high strength, large flow area, and small flow resistance. 5. According to user requirements, hard sealed butterfly valves can be designed with bidirectional sealing function. During installation, it is not limited by the flow direction of the medium or affected by spatial location, and can be installed in any direction. 6. The drive device can be installed in multiple workstations (rotating 90 ° or 180 °), making it easy for users to use. Processing Technology Based on the structural characteristics of the triple eccentric metal hard seal butterfly valve, the sealing ring of the butterfly plate assembly is a combination of stainless steel plate, asbestos plate, or graphite. The valve body sealing ring is made of hard alloy with high hardness, and it is difficult to control the cutting amount, making it difficult to process and shape in one go. Moreover, the roughness requirements for the machined surface are very high. To ensure processing requirements, the process is as follows: Rough machining of valve body or butterfly plate assembly →→ Valve body sealing ring is welded with hard alloy for insulation and heat treatment to eliminate thermal stress →→ Sealing surface of rough turning of upper tooling →→ Upper tooling precision turning sealing surface →→ Grinding sealing surface with upper grinding head →→ Boring shaft holes for valve body and butterfly plate assembly →→ Strength test sealing test

"صمام الفراشة هو صمام يعزل أو ينظم تدفق المائع. آلية الإغلاق هي قرص يدور. "نظرًا لصغر حجمها ، وبُعدها وجها لوجه ووزنها الخفيف ، غالبًا ما يستخدم صمام الفراشة بأحجام كبيرة. في dervos ، نقدم صمام فراشة متحدة المركز ، صمام فراشة غريب الأطوار ، صمام فراشة عالي الأداء ، صمام فراشة مبطن ptfe ، صمام فراشة هوائي ، وصمام فراشة بمحرك.


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