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隔膜阀的结构组成及工作特点介绍
进口隔膜阀用耐腐蚀衬里的阀体和耐腐蚀隔膜代替阀芯组件，利用隔膜的移动起调节作用。隔膜阀的阀体材料采用铸铁、铸钢，或铸造不锈钢，并衬以各种耐腐蚀或耐磨材料、隔膜材料橡胶及聚四氟乙烯。衬里的隔膜耐腐蚀性能强，适用于强酸、强碱等强腐蚀性介质的调节。
隔膜阀的结构简单、流体阻力小、流通能力较同规格的其他类型阀大；无泄漏，能用于高粘度及有悬浮颗粒介质的调节。隔膜把介质与阀杆上腔隔离，所以没有填料介质也不会外漏。但是，由于隔膜和衬里材料的限制，耐压性、耐温性较差，一般只适用于1.6MPa公称压力和150℃以下。
隔膜阀的流量特性接近快开特性，在60%行程前近似为线性,60%后的流量变化不大。
气动形式的隔膜阀尚可附装反馈信号、限位器及定位器等装置，以适应自控、程控或调节流量的需要。气动隔膜阀的反馈信号采用无触点传感技术。该产品采用薄膜式推进气缸，替代活塞气缸，排除了活塞环易损坏，造成泄漏而导致无法推动阀门启闭的弊端。当气源发生故障时，尚可操作手轮使阀门启闭。
The composition and work characteristics of the diaphragm valve Regulate the diaphragm valve diaphragm instead of the spool component corrosion-resistant lining of the body and resistance to corrosion, the use of the diaphragm move. Diaphragm valve body materials made of cast iron, cast steel or cast stainless steel, and lined with a variety of corrosion or wear-resistant materials, diaphragm materials, rubber and PTFE. The lining membrane corrosion resistance, applies to the regulation of acid, alkali and other strong corrosive media. The diaphragm valve of simple structure, small fluid resistance, and flow capacity than other types of valves with the specifications; no leakage, can be used for high viscosity and suspended particles in the medium adjustment. Diaphragm to the media and the stem cavity isolation, so there is no packing medium does not leak. However, due to the limitations of the diaphragm and lining materials, pressure, temperature resistance and poor, generally apply only to 1.6MPa Nominal pressure and 150 ° C or less. The flow characteristics of the diaphragm close to the features quick, before 60% of stroke is approximately linear, 60% of the traffic changes. Aerodynamic form of the diaphragm valves can still be attached to the feedback signal, stopper and locator devices, to adapt to the needs of self-control, program control or regulate traffic. The pneumatic diaphragm valve feedback signal using non-contact sensor technology. This product uses the film propulsion cylinder, replace piston cylinder, ruled out the piston rings are easily damaged, resulting in leakage caused by the drawbacks that can not push the valves open and close. When the gas supply fails, they can still handwheel valves open and close.
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