German durgo valves durgo models durgo prices

durgo 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 operation 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 use. Safety valves installed outdoors must adopt appropriate protective measures to prevent rain, fog, dust, rust, and other contaminants from entering the safety valve and discharge pipeline. When the ambient temperature is below zero degrees Celsius, necessary anti-freezing measures should be taken to ensure the reliability of the safety valve's action.

durgo valve classification

Safety relief valves are mainly divided into two categories: spring-loaded and lever-loaded. 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 non-closed types. Closed types should generally be selected for flammable, explosive, or toxic media, while non-closed types can be selected for steam or inert gases. Spring-loaded safety valves may also come with or without a lever. The primary function of the lever is to check the flexibility of the valve disc, and it can sometimes be used for manual emergency pressure relief. Lever-loaded safety valves primarily rely on the force of the lever and weight to operate, but their large size often limits their range of application. For higher temperatures, select safety valves with radiators. The main parameter of a safety relief valve is 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.

durgo 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, and the setting pressure range of the spring or lever is determined by the calculated set pressure value of the safety valve. Then, the material and structural type of the safety valve are determined based on the medium used, 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 non-closed micro-lift safety valves with levers. 2) Steam boilers or steam pipelines generally use non-closed 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, heat exchangers, etc. 5) Compressible media such as gases generally use closed full-lift safety valves, such as for air receivers, gas pipelines, etc. 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, power station boilers, etc., 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 pipeline at the outlet of LPG station tank pumps. 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.

durgo valve maintenance methods

In the manufacturing process of hydraulic valves, to effectively improve assembly precision, the selective assembly method is mostly chosen. 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, a certain method is used to recombine and select fits. 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 gap under the action of the spring, grinding 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's function well, then when selecting the valve body and spool, the interference amount in the machining allowance requirements should be met. 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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