CN HDFM - Valve Information, Valve Technology

Abstract: The hydraulic drive fast off valve maintenance method and maintenance points.

Keywords: quick closing valve; hydraulic actuator; maintenance; maintenance

1 Overview

Butterfly valve hydraulic drive unit of Fast electric cut-off valve and check valve to resolve can not be fast off (> 1s) of the turbine speed caused the problem. When the crew when the accident occurred, fast off valve hydraulic driving system can quickly drive the valve closed, to effectively prevent the tail steam turbine and condensed water intrusion, and instantly cut off the pipeline to protect turbine. From this quick closing valve hydraulic drive devices are safety devices to ensure the normal operation of its own it is very necessary, correct maintenance and repair is essential to ensure normal operation of equipment condition, following the introduction of hydraulic drive fast off valve Device maintenance method and maintenance points.

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Posted in Technical Literature | Tagged Butterfly valve

Abstract: Pneumatic Diaphragm Control Valve detailed working principle of rule flow characteristics, C value, the determination of diameter, and the combination of aluminum slurry Section of Journal of Shanxi Branch of slurry transport in control, as to the correct selection and application process The right to amend the actual situation, and the installation process for attention.

With the rapid development of China’s nonferrous metals industry, pneumatic membrane valves as simple structure, convenient operation, reliable, fire proof, etc., are widely used in the production of alumina. The automatic control system as an important part of its working condition is good or bad will directly affect the control process, Based on its own based on the practical work described in detail Pneumatic Diaphragm Regulating Valve’s working principle, selection process, installation and maintenance.

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Posted in Technical Literature | Tagged Regulating valve • Valve selection

Abstract: The seal structure was discussed about stainless steel spherical valve, the factors of the key seal structure and the seal material of spherical valve that affected the sealing and using performance and the reliability was analyzed, and the combination seal structure of distensible circle and labial structure of PTFE was proposed.

Keywords: Spherical valve; Seal structure; Combination seal structure

Ball valve with its well-known, widely used in various pipeline systems quickly cut off, change the media flow and control, can use manual, electric or pneumatic drive means. Figure 1 shows a typical valve structure (not to consider drive mode).

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Posted in Technical Literature | Tagged Seal structure • Stainless steel ball valve

Abstract: The electric control valve output is difficult to use an accurate digital model to describe, but it can accurately measure. In view of this feature, step-style control of the input signal does not directly respond, but the number of fixed points of the step, according to the measurement result for each input command signal step by step approach to set the amount. The reasonable control parameters set, the method to control the object is stable, suitable for less demanding on the response speed of the flow or pressure to follow or stability control.

Keywords: electric valve; Stepping control; step; sampling period; response speed

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Posted in Technical Literature | Tagged Electric control valve • Regulating valve