BD-8000系列气动调节阀BD-8000 series pneumatic control valve
BD-8000系列气动薄膜直通单座调节阀采用顶导向结构，配用多弹簧执行机构。具有结构紧凑、重量轻、动作灵敏、流体通道呈3流线型、压降 损失小、阀容量大、流量特性精确、拆装方便等优点。广泛应用于精确 控制气体、液体等介质，工艺参数如压力、流量、温度、液位保持在给 定值。特别适用于允许泄漏星小阀前后压差不大的工作场合。
本系列产品有标准型、调节切断阀、波纹管密封型、夹套保温型、防腐衬氟型等 多种品种。产品公称压力等级有PN10、16、40、64；阀体口径范围DN20~300。适用流体温度由-196℃~+560℃范围内多种档次。泄漏标准有IV级或VI级。流量特性为线性或等百分比。多种多样的品种规格可供选择。
BD-8000气动单座调节阀的特点
1.顶导向单座调节阀，结构紧凑，部件少、易维修。
2.金属阀芯适合多种工作场合，达IV级泄漏标准，软密封结构阀芯达VI级泄漏标准。
3.阀体按流体力学原理设计成等截面低阻流道，额定流量系数增大30%。可调范围大，固有可调比为50:1。执行机构采用多弹 簧结构，高度减少30%，重量减轻30%。
4.BD-8000系列波纹管密封调节阀，对移动的阀杆形成完全的密封，堵绝流体外漏。BD-8000系列气动薄膜调节阀带有保温夹套，用于流体冷却后易结晶、凝固造成堵塞的场合。
5.BD-8000系列波纹管密封防腐衬氟调节阀，由于波纹管元件本身变形性和卓著的抗老化性，完全克服了填料密封阀通常存在的填料老化和温差敏感等弱点。其次，采用波纹管和填料双重密封结构，安全可靠性更好。因此在剧毒，强腐蚀性，放射性等稀有特殊介质的自动控制系统中得到广泛应用。
6.BD-8000系列气动三通调节阀,气动三通调节阀三通阀，采用双阀芯上下导向结构，通常使用在热交换器上，根据用途可分为分流调节型(一进二出)、合流调节型（二进一出）、快速切断型。
The BD-8000 series pneumatic diaphragm straight-through single-seat regulating valve adopts a top-guided structure and is equipped with a multi-spring actuator. It has the advantages of compact structure, light weight, sensitive operation, a 3-streamline flow channel, low pressure loss, large valve capacity, precise flow characteristics, and convenient disassembly and assembly. It is widely used for precisely controlling gases, liquids, etc., maintaining process parameters such as pressure, flow, temperature, and liquid level at given values. It is particularly suitable for working conditions where leakage is allowed to be small and the pressure difference before and after the valve is not large.
This series includes standard type, regulating and cutting valve, bellows-sealed type, jacketed insulation type, and fluorine-coated anti-corrosion type, among others. The nominal pressure grades of the products are PN10, 16, 40, 64; the valve body diameter range is DN20 to 300. The applicable fluid temperature ranges from -196℃ to +560℃. The leakage standard is IV or VI. The flow characteristics are linear or equal percentage. There are various varieties and specifications for selection.
Features of the BD-8000 pneumatic single-seat regulating valve:
1. Top-guided single-seat regulating valve, compact structure, few components, easy maintenance.
2. Metal valve core suitable for various working conditions, reaching IV-level leakage standard, soft-sealed structure valve core reaching VI-level leakage standard.
3. The valve body is designed according to the principles of fluid mechanics as an equal-section low-resistance flow channel, with a 30% increase in rated flow coefficient. Large adjustable range, inherent adjustable ratio of 50:1. The actuator adopts a multi-spring structure, reducing the height by 30% and the weight by 30%.
4. The BD-8000 series bellows-sealed regulating valve for pneumatic control, forms a complete seal against the moving valve stem, completely preventing fluid leakage. The BD-8000 series pneumatic diaphragm regulating valve with an insulation jacket is used in situations where fluid cooling causes crystallization or solidification and leads to blockage.
5. The BD-8000 series bellows-sealed and fluorine-coated anti-corrosion regulating valve, due to the deformation and outstanding aging resistance of the bellows element, completely overcomes the weaknesses of the typical packing seal valve such as aging of packing and sensitivity to temperature differences. Additionally, it adopts a dual-sealing structure of bellows and packing, providing better safety and reliability. Therefore, it is widely used in automatic control systems for rare special media such as highly toxic, strongly corrosive, and radioactive substances.
6. The BD-8000 series pneumatic three-way regulating valve, the pneumatic three-way regulating valve, adopts a double-valve core top-guided structure, usually used on heat exchangers, and can be divided into分流 regulating type (one inlet and two outlets)， converging regulating type (two inlets and one outlet)， and rapid cutting type according to the purpose.
