大型法兰的垫片是一种能产生塑性变形、并且具有   强度的材料制成的圆环。大多数的垫片是从非金属板裁下来的，或者是由专业的工厂按规定尺寸制作，它的材料为石棉橡胶板、石棉板、聚乙烯板等；也有用薄金属板(白铁皮、不锈钢)将石棉等非金属的材料包裹起来制成的金属包垫片；还有一种用薄钢带与石棉带一起绕制而成的缠绕式垫片。
The gasket of large flange is a ring made of material which can produce plastic deformation and has strength. Most gaskets are cut from non-metallic sheets, or are manufactured by professional factories according to specified sizes. Their materials are asbestos rubber sheets, asbestos sheets, polyethylene sheets, etc. They are also metal-clad gaskets made by wrapping asbestos and other non-metallic materials with thin metal sheets (white iron sheets, stainless steel), and thin steel. A spiral wound gasket that is wound with asbestos belt.
说到大型法兰的芯头制作，我们先介绍一下不锈钢法兰的制作过程，顾名思义，不锈钢法兰就是用不锈钢钢板加工而成的法兰。通常，它由一个牛角形状的芯头，芯头的直径从细变粗，整个推制过程就是扩径和弯曲的过程。
Speaking of the core production of large flange, we first introduce the manufacturing process of stainless steel flange. As the name implies, stainless steel flange is a flange made of stainless steel plate. Usually, it consists of a bullhorn-shaped core, the diameter of the core changes from fine to thick, the whole process of pushing is the process of expanding and bending.
归入正题，大型法兰的芯头是如何制作的呢？就拿常见的国标弯头做例子吧，如果是制作长半径弯头，需要我们先选择产品规格，然后提出管料，然后再根据计算好的扩径率进行加工。基本的加工完成后，还需要对产品进行一系列的整理工作，也就是说，对产品的外观和其它细节作进一步的处理，这其中主要包括喷丸处理、打钢字、表面喷涂和包装工作。
As a matter of fact, how is the core of large flange made? Take the common national standard elbow as an example. If we make long radius elbow, we need to select the product specifications first, then put forward the pipe material, and then process according to the calculated enlargement rate. After the basic processing is completed, a series of finishing work is needed, that is to say, the appearance and other details of the product are further processed, which mainly includes shot peening, typewriting, surface spraying and packaging.
大型法兰常见的整体法兰有平焊法兰及对焊法兰。平焊法兰的刚性较差，适用于压力p≤4MPa的场合；对焊法兰又称高颈法兰，刚性较大，适用于压力温度较高的场合。法兰密封面的型式有三种：平面型密封面，适用于压力不高、介质   的场合；凹凸密封面，适用于压力稍高的场合；榫槽密封面，适用于易燃、易爆、有毒介质及压力较高的场合。不同性质的法兰管件在不同的领域中具有良好的产品性能，适应的场合和空间不同，产生的功效也会不同。
Flanges and butt welding flanges are common flanges for large flanges. Flat-welded flange has poor rigidity, which is suitable for pressure P < 4 MPa. Butt-welded flange is also called high neck flange, which has high rigidity and is suitable for high pressure and temperature occasions. There are three types of flange sealing surface: flat sealing surface, suitable for low pressure, medium occasions; concave and convex sealing surface, suitable for high pressure occasions; mortise sealing surface, suitable for flammable, explosive, toxic media and high pressure occasions. Flanged pipe fittings of different properties have good product performance in different fields, and the effect will be different when the occasion and space are different.