Varistroke I解决了汽轮机用户的首要可靠性问题…污油！

伍德沃德VariStroke致动器的专利耐脏和自清洁技术确保您的蒸汽透平机具有更高的整体可靠性。线性电动液压阀致动器的可变冲程系列操作机械驱动或发电机驱动的蒸汽涡轮机。这些线性致动器利用低压液压油源(通常为涡轮润滑油)来提供输出轴力。其卓越的精度和分辨率使其成为蒸汽阀控制和相关汽轮机转速和负载控制的理想选择，在这些应用中，汽轮机的正常运行时间和可用性至关重要。

VariStroke系列可通过简单易用的基于计算机的PC服务工具进行配置，允许用户轻松配置、校准和调整所有内部功能和响应设置。其集成驱动器包括一个4-20 mA输出通道，用于指示输出轴(控制阀)位置，以及装置报警和停机继电器输出，用作装置健康和状态指示。4-20 mA按需输入和双冗余轴位置传感器使其即使在按需输入或反馈传感器故障的情况下也能继续运行，从而确保延长强制停机和在线系统维修之间的运行时间。

这种完全集成的致动器的总安装成本很低，因为它是在工厂完全组装和测试的，大大减少了OEM和最终用户的制造、测试和现场组装时间。在改型应用中，变冲程致动器可用于直接取代现有的伺服系统。这节省了对现有和老化伺服系统的昂贵维修，消除了为过时设备获取备件的困难，并减少了校准时间和难度。

耐脏设计:

两个移动部件

50磅切屑剪切力

自洁阀设计

可变/可配置轴行程长度

快速压摆率/时间:

依赖于应用

500 psi供应压力空载时，转换速率高达762毫米/秒(30英寸/秒)

精确位置控制

侧向负载容许:

轴承

三重密封技术

集成驱动器:

4–20毫安

包括阀门流量线性化表

冗余MLDT位置传感器

通过危险场所认证

Varistroke I solves steam turbine users #1 reliability problem…dirty oil!

The patented dirt tolerant and self-cleaning technology of Woodward’s VariStroke actuators ensure greater overall reliability of your steam turbine. The VariStroke line of linear electro-hydraulic valve actuators operate mechanical-drive or generator-drive steam turbines. These linear actuators utilize a low-pressure, hydraulic oil source (typically turbine lube oil) to provide output shaft force. Their superb accuracy and resolution make them ideal for steam valve control and related turbine speed and load control, where turbine up-time and availability is essential.

The VariStroke line is configurable via a simple user-friendly, computer-based PC service tool, allowing users to easily configure, calibrate, and adjust all internal functions and response settings. Its integrated driver includes a 4-20 mA output channel to indicate output shaft (control valve) position, as well as unit alarm and shutdown relay outputs for use as unit health and status indications. The 4-20 mA demand inputs and dual-redundant shaft position sensors allow it to continue to operate even with demand input or feedback sensor failures, ensuring extended run-times between forced outages and on-line system repair.

The total installed cost for this fully-integrated actuator is low because it is completely assembled and tested at the factory, greatly reducing OEM and end-user fabrication, testing, and site assembly time. In retrofit applications, the VariStroke actuator can be used to directly replace the existing servo system. This saves costly repairs to existing and aging servos, eliminates the difficulty of obtaining spare parts for obsolete equipment, and reduces calibration time and difficulty.

Dirt-tolerant design:

Two moving parts

50 lb chip shear force

Self-cleaning valve design

Variable / configurable shaft stroke lengths

Fast slew rates/times:

Application dependent

Slew rate up to 762 mm/s (30 inches/second) @ 500 psi supply pressure no load

Precise position control

Side-load tolerant:

Shaft bearings

Triple seal technology

Integrated driver:

4–20 mA

Included valve flow linearization table

Redundant MLDT position sensors

Certified for Hazardous Locations