German AREVA T&D valves, AREVA T&D models, AREVA T&D prices

AREVA T&D valves are key safety safeguards for pressure pipelines and pressure vessels. To ensure the normal operation of safety valves and extend their service life, regular inspections should be conducted during use to check for abnormalities such as leakage, jamming, and spring corrosion. Observe whether the lock nuts of the adjusting screw sleeve and the set screws of the adjusting ring are loose. If any issues are found, take appropriate maintenance measures promptly. Safety valves should also be periodically removed for comprehensive cleaning, inspection, regrinding, and recalibration before being put back into service. Safety valves installed outdoors must have appropriate protective measures to prevent rain, fog, dust, rust, and other contaminants from entering the safety valve and discharge piping. When the ambient temperature is below zero degrees Celsius, necessary anti-freezing measures should be taken to ensure the reliable operation of the safety valve.

AREVA T&D valve classification

Safety relief valves are mainly divided into two categories: spring-loaded and lever-operated. There are also impulse safety valves, pilot-operated safety valves, safety changeover valves, safety decompression valves, and dead-weight safety valves. Spring-loaded safety valves primarily rely on the force of the spring to operate. Within spring-loaded safety valves, there are closed and open types. Closed types should be selected for flammable, explosive, or toxic media, while open types can be selected for steam or inert gases. Spring-loaded safety valves may also come with or without a lever. The lever is mainly used to check the flexibility of the valve disc and can sometimes be used for manual emergency pressure relief. Lever-operated safety valves primarily rely on the force of the lever and weight to operate, but their large size often limits their range of application. Safety valves with radiators should be selected for higher temperatures. The main parameter of a safety relief valve is the discharge capacity, which is determined by the seat diameter and the opening height of the valve disc. Based on different opening heights, they are divided into micro-lift and full-lift types. Micro-lift means the opening height of the valve disc is 1/40 to 1/20 of the seat throat diameter. Full-lift means the opening height of the valve disc is 1/4 of the seat throat diameter.

AREVA T&D valve selection

The nominal pressure of the safety valve is determined by the operating pressure, the operating temperature range is determined by the operating temperature, the setting pressure range of the spring or lever is determined by the calculated set pressure value of the safety valve, the material and structural type of the safety valve are determined by the medium, and the throat diameter of the safety valve is calculated based on the discharge capacity. The following are general rules for selecting safety valves. 1) Hot water boilers generally use open, micro-lift safety valves with levers. 2) Steam boilers or steam pipelines generally use open, full-lift safety valves with levers. 3) Incompressible media such as water generally use closed, micro-lift safety valves or safety relief valves. 4) High-pressure feedwater generally uses closed, full-lift safety valves, such as for high-pressure feedwater heaters and heat exchangers. 5) Compressible media such as gases generally use closed, full-lift safety valves, such as for air receivers and gas pipelines. 6) E class steam boilers generally use dead-weight safety valves. 7) Large-diameter, high-discharge, and high-pressure systems generally use impulse safety valves, such as for desuperheating and pressure-reducing devices and power plant boilers, as shown in Figure 8. 8) Railway tank cars, truck tankers, and storage tanks transporting liquefied gas generally use internal safety valves, as shown in Figure 4. 9) Oil tank tops generally use hydraulic safety valves, which need to be used in conjunction with breathing valves. 10) Underground drainage or natural gas pipelines generally use pilot-operated safety valves, as shown in Figure 6. 11) Safety return valves are generally used on the liquid phase return pipelines at the outlet of tank pumps at liquefied petroleum gas stations. 12) Vacuum negative pressure safety valves are generally used for systems under negative pressure or where negative pressure may occur during operation. 13) Bellows safety valves are generally used for containers or piping systems with significant back pressure fluctuations and toxic or flammable media.

AREVA T&D valve maintenance methods

In the manufacturing process of hydraulic valves, selective assembly is mostly chosen to effectively improve assembly precision. This means that for a batch of finished parts, such as valve spools and valve bodies, the most reasonable fit clearance should be selected based on actual dimensions before assembly, ensuring good sliding performance and sealing performance of the valve spool. In other words, for hydraulic valves of the same type, there may be certain differences in the mating dimensions between the valve body and the valve spool. In actual use, when a company has a large number of failed hydraulic valves, all hydraulic valves can be disassembled and cleaned, each part inspected and measured, and the parts classified based on the inspection results. Then, they can be recombined and selectively assembled using appropriate methods. After inspection, if wear is found on both the valve body and the valve spool, but there are no severe scratches on the working surface or no severe local wear, valve bodies and spools with appropriate clearances can be selected for reassembly. If the fit clearance between the valve body and the valve spool increases compared to the clearance specified in the product drawings, and the increase is between 20% and 25%, methods should be adopted to increase the size of the valve spool, followed by lapping and repair. For conical valve groups, if the contact surface sealing between the seat and the spool is poor, since the conical valve can automatically compensate for the clearance under the action of the spring, lapping is sufficient. If the wear between the valve body and the valve spool is uneven or there are scratches on the working surface, and the above methods cannot restore the hydraulic valve function well, the selection of the valve body and spool should meet the interference requirements in the machining allowance. The valve body hole should be appropriately reamed, and the valve spool should be appropriately ground, so that the shape precision and assembly clearance are reasonable.

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