German Oil Control valve Oil Control model Oil Control price

Oil Control 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. Pay attention to 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 in a timely manner. 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 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.

Oil Control 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 operate primarily through the force of a spring. 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 used 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 work primarily through the force of a lever and weight, but their bulky size often limits their range of application. For higher temperatures, select safety valves equipped 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 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.

Oil Control 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 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 medium used, and finally 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 unsealed micro-lift safety valves with a wrench. 2) Steam boilers or steam pipelines generally use unsealed full-lift safety valves with a wrench. 3) Incompressible media such as water generally use closed micro-lift safety valves or safety relief valves. 4) High-pressure feedwater systems generally use closed full-lift safety valves, such as high-pressure feedwater heaters and heat exchangers. 5) Compressible media such as gases generally use closed full-lift safety valves, such as gas storage tanks 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 pulse-type safety valves, such as 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 breather valves. 10) Underground drainage or natural gas pipelines generally use pilot-operated safety valves, as shown in Figure 6. 11) Liquid-phase return pipelines at the outlet of LPG station tank pumps generally use safety return valves. 12) Systems under negative pressure or those that may generate negative pressure during operation generally use vacuum negative pressure safety valves. 13) Container or piping systems with significant backpressure fluctuations and toxic or flammable substances generally use bellows safety valves.

Oil Control valve maintenance methods

In the manufacturing process of hydraulic valves, selective assembly is mostly chosen to effectively improve assembly precision. That is, 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, classified based on inspection results, and then recombined using specific methods for selective assembly. After inspection, if wear is found on both the valve body and valve spool, but there are no severe scratches on the working surface or no severe local wear, you can choose a valve body and valve spool with appropriate clearance for reassembly. If the fit clearance between the valve body and valve spool increases compared to the specified clearance 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 seal between the seat and the valve spool is poor, since the conical valve can automatically compensate for clearance under spring action, grinding is sufficient. If the wear between the valve body and valve is uneven or there are scratches on the working surface, and the above methods cannot restore the hydraulic valve's function well, the selection of the valve body and valve 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 to ensure reasonable shape precision and assembly clearance.

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