تتحكم صمامات الفراشة في تدفق السائل في أنبوب باستخدام قرص متصل بعمود مركزي. يتحكم هذا القرص في كمية السوائل التي تمر عبر الصمام عن طريق إنشاء فتحة متغيرة.
Butterfly valves can be classified according to the alignment of the flap relative to the valve body:
صمام الفراشة المبكر هو صمام الفراشة الأكثر تقليدية متحدة المركز(صفر الفراشة غريب الأطوار). لأنه لا يمكن تحمل درجة الحرارة العالية والضغط العالي ولديه تسرب كبير, نطاق التطبيق الخاص به مقيد إلى حد كبير. من أجل تلبية متطلبات ظروف العمل المختلفة, تطورت صمامات الفراشة من صمام فراشة غريب الأطوار, صمام فراشة غريب الأطوار مزدوج وصمام الفراشة غريب الأطوار. لإظهاره في خط حدسي:
① صمام الفراشة Lconcentric
② Lsingle صمام الفراشة غريب الأطوار
③ صمام الفراشة غريب الأطوار
④ صمام الفراشة غريب الأطوار
Today FLUID TECH GROUP,تود الصين تقديم مسار تطور صمام الفراشة غريب الأطوار, and the double eccentric butterfly valve will be our leading role.
Evolution of butterfly valve غريبity
Earliest concentric butterfly valve
The design features of concentric rotary valves are that the axis of the valve stem, the center of the rotary plate and the center of the body are in the same position, the design is simple and easy to manufacture. Unfortunately, the butterfly plate and valve seat are always crushed and scratched, which creates a lot of resistance and wears out quickly.
The first غريبity
In order to solve the extrusion problem between the disc plate and the valve seat of the concentric rotary valve, a single eccentric rotary valve is manufactured. The design feature is that the axis of the valve stem deviates from the centre of the butterfly plate, so that the upper and lower ends of the butterfly plate are not the axis of rotation of the butterfly. Spray and reduce the excessive extrusion between the upper and lower ends of the butterfly plate and the valve seat. لكن, because the single eccentric design only reduces but does not eliminate the scratching phenomenon between the disc plate and the valve seat to a certain extent during the entire valve switching process, its application scope is similar to that of the concentric rotary valve, so it is not widely used.
The second غريبity
Based on the single eccentric butterfly valve, the double eccentric butterfly valve is currently widely used. The structural feature is that the valve stem axis deviates from the center of the butterfly plate and the center of the valve body.
The third غريبity
The third eccentricity of the throttle body has introduced some major changes: the seal structure has been significantly changed from a position seal to a torque seal. This means that it does not rely on the elastic deformation of the valve seat to achieve the sealing effect, but relies entirely on the pressure on the contact surface of the valve seat. This sealing structure allows the triple eccentric butterfly valve to achieve a VI level of sealing, achieving true zero leakage. في نفس الوقت, the triple eccentric butterfly valve uses a metal valve seat to achieve high heat resistance. At this stage of development, the problems of butterfly valve leakage and high temperature resistance have finally been solved.
Important roles of double eccentric butterfly valves
Double eccentric butterfly valves are widely used in fluid piping systems for control and containment in water supply and sewerage, مياه الصرف, بناء, البترول, المواد الكيميائية, textile, ورق, hydropower, المعادن, energy and other projects.
Double eccentric butterfly valves are widely used in chemical industry systems such as environmental control for transport, mixing, الترشيح, dehydration and other applications. في الصناعة الكيميائية, double-centre butterfly valves are mainly used for flow regulation and breakage control in corrosive, ارتفاع درجة الحرارة, high pressure, high viscosity and particulate media.
مجموعة التكنولوجيا السوائل,China produces high quality double eccentric butterfly valves,as long as you are in need of a double eccentric butterfly valve,FLUID TECH GROUP is a worthy choice.
Why are double غريب صمام الفراشةs widely used
The double eccentric effect allows for rapid separation of the slide plate from the valve seat after the valve is opened, which largely eliminates excessive compression and scrubbing between the slide plate and valve seat, reduces opening resistance and reduces valve seat wear. Greater durability. Friction is greatly reduced and this also provides the option of using a metal valve seat for the double eccentric gate valve, opening up its use in high temperature areas.
لكن, because the sealing principle is a positional sealing structure, إنه, the sealing surface of the butterfly plate and the valve seat is in line contact, and the elastic deformation caused by the butterfly plate extruding the valve seat produces a sealing effect, so the requirements for the closing position are very high (especially for metal valves). مقعد صمام), so the pressure-bearing capacity is still low.
على العموم, the double eccentric butterfly valve is already a type of butterfly valve with obvious advantages. The industry calls it a high-performance butterfly valve. مجموعة التكنولوجيا السوائل,China think this is a butterfly valve that is very worthy of buyers to consider purchasing,and provides high quality double eccentric butterfly valve.