In the light weight, durability, and good corrosion resistance based on the advantages, GF 567 butterfly valve product line will expand, new products include PP-H from DN350 to DN600.
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(Access this article on the article: “Butterfly valve closed failure analysis and processing method (Part I)“)
3.3 Close the valve during valve closure is less than the required torque by the friction moment of the premises bearing
In order to prevent the valve opening to prevent siltation, water flow valve closed against the lower edge of the hydrodynamic torque M always tend to close the valve, valve hydrodynamic pressure on the component of p along the flow direction along the flow direction, vertical component P1 upward direction.
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Abstract: In some rely on self-closing valve hammer the station, butterfly operation a few years later, appeared in the closing process less than fully closed position of valve related failures. For this analysis, a reliable valve automatically close the program, the program not only ensures the normal valve closure on the station’s maintenance, operation provides security, and better protect the valve spindle and bearing, extend the butterfly valve of use.
Key words: butterfly valve; off failure; cause analysis; treatment
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Abstract: The hydraulic drive unit of Fast hydraulic control valve and electrical control part of the series design .
Keywords：Fast off valve；Hydraulic actuator；Series Design
1 Overview
Extraction Steam Turbine Cogeneration can be achieved and widely used in thermal power plant of heating systems to prevent backflow of steam turbine extraction steam piping and condensate back flow , turbine speed caused the accident , the steam turbine extraction steam pipes and electric cut-off valve Check valve be installed between the valve off quickly to instantly cut off the steam pipe to protect the security . As soon shut off butterfly valves for fast (<1s), the output power large (> 100kN), must use the hydraulic drive unit , to adapt to various types of valves , quick closing valve on the hydraulic drive device of the serial design .
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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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Abstract: The issue of water supply networks in the valve, through research and field trips, and discuss some specific issues put forward relevant suggestions.
1 Valve in the water supply pipe network in the function
Water supply network will be sent to every household tap water transmission and distribution, water supply pipeline network located in every corner of the city, water supply network pipeline length as little as several hundred kilometers up to several thousand kilometers.
Water is irreplaceable and the people the necessity of survival, the decision of the water supply network the importance of safe operation. However, due to various objective and subjective reasons, often have some trouble pipeline, pipeline network, must constantly update the transformation of water users often have changes in the local pipe, therefore the phenomenon is difficult to avoid disruption of water supply. In order to narrow the scope without water in the pipe network within the proper installation of control valves but very necessary. So in a city water supply network, the number of tens of thousands of valves and irregularly distributed in the city streets below.
Valve is a control device, usually required to open the valve to be in place to reduce the loss of water pipe. If necessary, the valve should be closed quickly, all current and reliable.
Good rate of valve related to the valve selection, valve manufacturing, pipeline design, the valve assembly, valve opening and closing valve operation and management, of course, the main reason is the valve quality.
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