阀门定位器是气动调节阀的核心配套仪表，接收控制系统 4-20mA 模拟信号，根据设定值精准控制气动执行机构，调节阀门开度，克服阀杆摩擦力、介质压差扰动，提升调节精度与稳定性。支持单作用 / 双作用执行机构，符合 NAMUR 标准，可选本安、隔爆防爆及 SIL 认证，具备阀位反馈、故障诊断功能，广泛用于石油化工、生物制药、水处理等流程工业。
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