Дроссельный затвор с тройным эксцентриком из металла с твердым уплотнением , как высокопроизводительный клапан, имеет такие преимущества, как коррозионная стойкость, надежное уплотнение и небольшой момент открытия. Его уплотняющая поверхность представляет собой наклонную коническую поверхность, а контакт между уплотнительным кольцом корпуса клапана и уплотнительным кольцом узла дроссельной заслонки является поверхностным контактом. Его принцип работы заключается в прямом приводе в движение узла дроссельной заслонки за счет крутящего момента приводного устройства, в результате чего уплотнительное кольцо узла дроссельной заслонки полностью соприкасается с уплотнительным кольцом корпуса клапана и создает упругую деформацию для уплотнения.

Структурные характеристики

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