(2) The structure design of the dripping board Since the medium in the valve is a low-temperature medium, in order to avoid or reduce the transmission of the medium's temperature to the valve stem and the filling material at the upper end, and prevent these materials from failing due to freezing, a dripping plate can be added to the valve. Some research institutes have carried out experimental verification on this kind of valve with a drip plate, and proved that the upper...
The Design of Petrochemical Cryogenic Valves (Part Two) Read
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In recent decades, with the development of modern science and technology, there has been an increasing demand for cryogenic valves in engineering projects. Cryogenic valves are widely used in fertilizer, LNG and petrochemical fields and they are suitable for medium with temperatures between -40℃ and -250℃. Cryogenic valves include cryogenic ball valves, cryogenic solenoid valves, cryogenic gate valves, cryogenic globe valves, cryogenic safety valves, cryogenic check...
The Design of Petrochemical Cryogenic Valves (Part One) Read
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3. Analysis of low-pressure sealing test standards for check valves 3.1 Requirements in the Chinese standard system In the current national standard system, the main regulations related to check valves include GB/T 13932-2016 Iron Swing Check Valves and GBT 13927-2008 Pressure Tests for Industrial Valves. GB/T 13932-2016 section 5.2 Pressure Test stipulates that the shell's strength test and sealing performance test of the check valve shall be carried out in accordance with the method...
The Analysis of Low-pressure Sealing of Swing Check Valves (Part Two) Read
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Abstract In industrial practice, the high-pressure sealing of swing check valves is generally guaranteed, but the low-pressure sealing is often overlooked, which may cause serious abnormal working conditions. The principle of low-pressure sealing of swing check valves, the reasons for low-pressure sealing being neglected, and the applicable standards of low-pressure sealing are discussed based on this to improve the reliability of low-pressure sealing of swing check valves. Treatment of the...
The Analysis of Low-pressure Sealing of Swing Check Valves (Part One) Read
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1. The working principle and function of the gate valve Gate valves are cut-off valves used to cut off or connect the medium in the pipe, which are usually installed on pipes with a diameter greater than 100mm. The disc is shaped like a wedge. The gate valve has the advantages of easy opening and closing and low flow resistance. However, the sealing surface is easy to wear and leak; the opening stroke is great, and the maintenance is difficult. The gate valve cannot...
Repair Standards for Gate Valves Read
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Maintenance and quality standards of gate valves are shown as follows: Items Parts for maintenance Key points of the process Quality requirements 1 Visual inspection of the valve body 1. Remove dirt and heat preservation. 2. Check the surface of the valve body for defects such as double skin, cracks, and sand holes. There are no double skin, cracks, and sand holes on the surface of the valve body. 2 Disassembly of valves 1. Keep a record before disassembly. 2. The...
Maintenance and Quality Standards of Gate Valves Read
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1. Disassembly of gate valves Remove the fixing bolts of the upper frame of the bonnet; unscrew the nuts of the four bolts on the bonnet and turn the stem nut counterclockwise to separate the valve frame from the valve body. Then use a lifting tool to lift the frame down to the right place. The stem nut is to be disassembled for inspection. Take out the retainer ring at the sealing part of the valve body, and press the bonnet with a special tool to make a...
Repair of Gate Valves Read
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A Y-strainer is an indispensable filter device in the pipeline system for conveying the medium. A Y-strainer is usually installed at the inlet of a pressure reducing valve, a pressure relief valve, a level control valve, or other equipment to remove impurities in the medium, thus making valves and equipment used normally. A Y-strainer has the characteristics of advanced structure, small resistance, and convenient sewage discharge. The applicable media of a Y-strainer can be water, oil, and gas....
An Introduce to a Y-strainer Read
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Corrosion is the destruction and deterioration of materials under the action of various environments. The corrosion of metal is mainly caused by chemical corrosion and pitting chemical corrosion, and the corrosion of non-metallic materials is generally caused by direct chemical and physical damage. The forms of the valve's corrosion There are two forms for corrosion of metal valves, namely uniform corrosion and localized corrosion. The rate of uniform corrosion can be evaluated by the...
How to Deal with the Valve's Corrosion? Read
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