German Bieri hydraulik valves, Bieri hydraulik models, Bieri hydraulik prices

Bieri hydraulik 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 service. Outdoor-installed safety valves require 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 must be taken to ensure the reliable operation of the safety valve.

Bieri hydraulik Valve Classification

Safety relief valves are mainly divided into two categories: spring-loaded and lever-operated. Other types include impulse safety valves, pilot-operated safety valves, safety changeover valves, safety decompression valves, and dead-weight safety valves. Spring-loaded safety valves operate primarily through the force of a spring. They come in closed and open designs; closed types are generally selected for flammable, explosive, or toxic media, while open types can be used for steam or inert gases. Spring-loaded safety valves may also include those with or without a lifting lever. The lever is mainly used to check the flexibility of the valve disc and can sometimes serve for manual emergency pressure relief. Lever-operated safety valves work primarily through the force of a lever and weight, but their bulky size often limits their application range. Safety valves with radiators are selected for higher temperatures. 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 classified as micro-lift and full-lift types. Micro-lift means the valve disc opening height is 1/40 to 1/20 of the seat throat diameter. Full-lift means the valve disc opening height is 1/4 of the seat throat diameter.

Bieri hydraulik Valve Selection

The nominal pressure of the safety valve is determined by the operating pressure, the operating temperature range of the safety valve is determined by the operating temperature, the set pressure range of the spring or lever is determined by the calculated set pressure value of the safety valve, and then the material and structural type of the safety valve are determined according to the service medium, and finally the throat diameter of the safety valve is calculated based on the relief capacity of the safety valve. The following are general rules for selecting safety valves. 1) Hot water boilers generally use unenclosed micro-lift safety valves with a wrench. 2) Steam boilers or steam pipelines generally use unenclosed full-lift safety valves with a wrench. 3) Incompressible media such as water generally use enclosed micro-lift safety valves or safety relief valves. 4) High-pressure feedwater systems generally use enclosed full-lift safety valves, such as high-pressure feedwater heaters, heat exchangers, etc. 5) Compressible media such as gases generally use enclosed full-lift safety valves, such as air receivers, gas pipelines, etc. 6) E class steam boilers generally use dead-weight safety valves. 7) Large-diameter, high-capacity, and high-pressure systems generally use pilot-operated pulse safety valves, such as desuperheating and pressure-reducing devices, power plant 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 breather 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 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 backpressure fluctuations and containing toxic or flammable media.

Bieri hydraulik Valve Maintenance Methods

In the manufacturing of hydraulic valves, selective assembly is often chosen to effectively improve assembly precision. This means that for a batch of machined 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 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 is inspected and measured, classified based on the inspection results, and then recombined using selective assembly 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 surfaces or 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 has increased compared to the specifications in the product drawings, and the increase is between 20% and 25%, methods should be adopted to increase the dimensions 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, grinding is sufficient because the conical valve can automatically compensate for the gap under spring action. 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 adequately restore the hydraulic valve's function, the selection of the valve body and spool should meet the interference requirements for machining allowance. The valve body bore should be appropriately reamed, and the valve spool should be appropriately ground to ensure reasonable shape accuracy and assembly clearance.

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