China Shenzhen Wofly Technology Co., Ltd. Company News

A revolutionary advancement in fluid control technology has emerged—a 316 stainless steel metering valve featuring an angular design capable of withstanding extreme pressures up to 3000psi (~20.7MPa), setting a new benchmark for high-pressure industrial applications. Dubbed the "High-Pressure King," this innovation promises to transform precision fluid handling in demanding sectors such as chemical processing, energy, and marine engineering. Military-Grade Material: 316 Stainless Steel Ensures Unmatched Corrosion Resistance At the core of this valve lies 316 stainless steel, reinforced with molybdenum for superior resistance to pitting, crevice corrosion, and chloride exposure. Compared to conventional 304 stainless steel, it delivers 50% greater durability in harsh environments, reducing lifecycle costs by 30% and making it ideal for high-pressure, high-corrosion applications. Angular Design Revolution: Compact Footprint & Turbulence Control The valve’s 90° flow path eliminates the need for bulky piping configurations, enabling space-saving installations in tight industrial setups. Its multi-stage flow stabilization technology minimizes turbulence, maintaining ±0.1% metering accuracy even under extreme pressure fluctuations.   Certified for 3000psi: Redefining Safety & Reliability Rigorously tested by ASTM and API, the valve demonstrated zero leakage after 1,000 hours of continuous operation at 3000psi, with a burst pressure rating of 4500psi. Its self-compensating seat and reinforced sealing mechanism address the persistent issue of micro-leakage in high-pressure systems, meeting nuclear-grade safety standards. Applications: From Deep-Sea Drilling to Space Propulsion Industry experts highlight three key markets for this breakthrough: Supercritical Fluid Extraction: Enables ultra-precise fluid handling for pharmaceuticals and bioengineering. Deep-Sea Oil & Gas: Withstands corrosive, high-pressure conditions at depths beyond 3,000 meters. Aerospace Fuel Systems: Provides lightweight, high-reliability metering for rocket propulsion.   Major players like Shell and Sinopec are already evaluating adoption. As production scales, this "High-Pressure King" could drive a new era of efficiency and reliability in industrial fluid control.   Editor’s Note: In the era of Industry 4.0 and carbon neutrality, this 316 stainless steel angular metering valve represents not just a triumph in materials science and fluid dynamics, but also a leap forward in domestic high-end manufacturing—proving that precision engineering can conquer extreme challenges. The Bottom Line: In the Industry 4.0 era, precision instruments are vital for operational safety. This cost-effective 304 stainless steel solution could drive a widespread upgrade across industrial temperature control systems.

A cutting-edge industrial-grade thermometer has recently hit the market, capturing industry attention with its exceptional accuracy and rugged durability. Designed for harsh environments, the 0-250°C Large-Dial 304 Stainless Steel Thermometer promises to deliver reliable temperature monitoring for sectors such as chemical processing, food production, and pharmaceuticals. Key Features: Military-Grade Durability & Precision 1. 304 Stainless Steel Construction: The corrosion- and heat-resistant housing ensures long-term stability, even in humid or chemically aggressive settings. Wide 0-250°C Range: Covers critical industrial applications, including boiler systems, mechanical heat monitoring, and more. High-Visibility Dial: A shock-resistant glass cover and precision-calibrated scale (error margin: ±1%) enable quick, accurate readings. Industrial Protection: IP65-rated sealing guards against dust and water ingress, while a reinforced probe withstands vibrations in workshops or outdoor use. The Bottom Line: In the Industry 4.0 era, precision instruments are vital for operational safety. This cost-effective 304 stainless steel solution could drive a widespread upgrade across industrial temperature control systems.

Cylinder adapters achieve cross-compatibility between gas systems through key technical means such as standardised interfaces, pressure regulation, material compatibility and safety design. The following are the specific realisation methods and precautions 1. Standardised interface design Matching of thread specifications The adapter needs to be compatible with the thread standards of different gas cylinders (e.g. CGA, EN, GB, etc.), and the mismatch of interfaces can be solved through physical transfer. For example CGA 580 (American oxygen cylinder) to DIN 477 (European standard) adapter. Quick coupling system Some industrialmedical fields use quick-connect couplings (e.g. QC series), and the adapters need to support the locking mechanism of different brands. 2. Pressure regulation and flow control Integrated Pressure Reducing Valve The adapter can be equipped with a built-in pressure reducing valve to adjust the output of a high pressure cylinder (e.g. 200 bar) to a pressure compatible with a low pressure system (e.g. 50 bar). Example diving cylinder adapter to match the operating pressure range of the regulator. Flow restrictor prevents instantaneous release of high pressure gas from overloading downstream equipment. 3. Material compatibility and sealing Corrosion-resistant materials Select adapter material according to gas properties (e.g. stainless steel for corrosion resistance, brass for inert gases). Note Oxygen system needs to be treated with no oil to avoid reaction with combustible materials. Sealing technology metal seals (high pressure) or Viton gaskets (chemical compatibility) are used to ensure no leakage.   4. Safety and Certification Pressure relief device some adapters are equipped with a safety valve to prevent the risk of overpressure. Certification compliance adapters are subject to industry certification (e.g. ISO 10297 cylinder valve standard, DOT or CE marking). 5. Special gas handling Gas purity protection Adapters for high purity gases (e.g. electronic grade gases for semiconductors) need to be polished on the inside to avoid contamination. Inert design Adapters for flammable gases (e.g. hydrogen) need to be anti-static and anti-tempering.   6. Application Scene Adaptation Medical field Oxygen adapters need to be matched with breathing masks and anaesthesia machine interfaces, with emphasis on fast switching and sterility. Industrial field welding gas cylinder (e.g. acetyleneargon) adapters need to be explosion-proof and high temperature resistant.   Cautions No mixing of gases the adapter only solves the physical connection problem, it is necessary to ensure that the gases are chemically compatible (e.g. oxygen may explode if it comes into contact with grease). Periodic testing The adapter must be checked periodically for tightness and structural integrity. User training The operator must be aware of the pressure range and gas characteristics of the adapter.   With the above design, cylinder adapters can be safely and flexibly used to achieve cross-compatibility between different gas systems, subject to strict adherence to gas type, pressure and environmental requirements.

Stainless steel flexible high pressure braided hoses for gas use are designed in different lengths, mainly to meet diverse application scenarios and practical needs. 1. Adaptation to Different Installation Distances Long distances: Some applications (e.g. industrial gas distribution, laboratory equipment connections) require hoses to span long distances. Longer hoses (e.g. 10 metres or more) reduce the use of couplings and reduce the risk of leakage. Short connections: Compact spaces (e.g. medical equipment, gas stoves) require short hoses (0.5-2 metres) to avoid tangles or redundancies, ensuring safety and aesthetics. 2. Pressure and Flow Optimisation Length affects pressure drop: Fluid flow in a long hose creates frictional resistance, resulting in a drop in pressure. High-pressure scenarios (e.g. hydrogen storage) may require shorter hoses to maintain pressure stability. Flow matching: Long hoses may restrict flow rates, and the appropriate length should be selected based on the type of gas (e.g., propane, oxygen) and flow requirements.   3. Safety and Compliance Requirements Standards: Different countries/industries have strict regulations on hose lengths. For example, domestic gas hoses are usually no longer than 1.5 metres to prevent the risk of mechanical damage or deterioration. Bend radius limitation: Excessive bending of long hoses may lead to fatigue breakage of the metal braid, and the length needs to be adjusted according to the usage environment.   4. Flexibility and Convenience Mobile equipment needs: If welding cylinders need to be moved frequently, longer hoses (3-5 metres) provide operational flexibility; for fixed equipment, shorter hoses reduce clutter. Installation Angle Adaptation: Different lengths can be adapted to complex pipework, avoiding twisting or stretching.   5. Cost and Material Savings Customisation: Avoiding the waste of material caused by excessively long hoses (higher cost of stainless steel), users can choose economic lengths according to actual needs. Transportation constraints: Extra long hoses (e.g. >20m) may be more difficult to transport, standardised lengths in segments are easier to handle.   6. Special Application Scenarios High/low temperature environments: Extreme temperatures may cause the hose to expand and contract, so allowances should be made for length. Vibration cushioning: vibration areas of machinery and equipment (e.g. compressor outlets) may require longer hoses to absorb vibrations.   Summary Stainless steel flexible high pressure braided hoses are available in different lengths to balance safety, functionality, economy and compliance. Selection requires consideration of the gas type, pressure rating, installation environment and industry standards to ensure that it meets both the needs of the application and safety regulations.

Why do I need to avoid overpressure? Equipment damage: Downstream instruments, pipelines or vessels may rupture due to pressure exceeding design values. Safety hazards: Gas/liquid leaks can lead to fire, explosion (e.g. flammable media) or mechanical injury. Regulator failure: Prolonged overpressure can damage diaphragms, springs or spools, resulting in regulation failure. Common causes of overpressure Upstream pressure surge: e.g. uncontrolled pressure of air source, sudden start of pump. Downstream blockage: Valve mistakenly closed or filter clogged, resulting in pressure build-up. Regulator failure: Valve spool jammed, diaphragm rupture, losing the function of pressure reduction. Incorrect operation: Manual adjustment exceeds the system pressure limit.   How to avoid overpressure effectively? 1. Choose a pressure regulator with safety features Built-in pressure relief valve: some regulators have integrated pressure relief holes (e.g. LPG pressure reducing valves), which automatically vent the air in case of overpressure. Flow limiting design: Physically limiting the maximum output pressure (e.g. unregulated pressure reducing valves).   2. Used in conjunction with an independent safety valve Installation position: The safety valve should be located downstream of the regulator, near the equipment to be protected. Setting value: Safety valve starting pressure ≤ Maximum allowable pressure of downstream equipment (usually 1.1~1.2 times the set pressure).   Type selection: Spring-loaded safety valve: for gas/liquid, reusable. Rupture disc: one-time pressure relief, for extreme high pressures or corrosive media. 3. System Design Redundancy Parallel redundant regulators: Critical systems can be configured with dual regulators + switching valves for manual switching in case of failure. Pressure sensor + alarm: real-time monitoring of downstream pressure, triggering shutdown or audible and visual alarms in case of overrun.   4. Operation and Maintenance Slow pressure increase: gradually increase the pressure when regulating to avoid shocks. Regular test: manually trigger the safety valve to check its effectiveness (pay attention to safety protection). Replacement of worn parts: e.g. aging of diaphragms and seals can lead to failure of the pressure relief function.   Safety Valve Selection Example Parametric Example Value Clarification Medium compressed air Compatible material stainless steel Set Pressure 10 bar Lower than the maximum pipe pressure (e.g. 12 bar) Leakage Rate 50 m³/h Required to meet maximum system overpressure flow requirements. Connection Method G1/2” Thread Match pipe size.   Typical application scenarios Laboratory gas cylinders: oxygen regulator + safety valve to prevent overpressure in experimental equipment. Industrial boilers: main regulator + multiple safety valves, complying with ASME standards. Hydraulic system: relief valve as safety valve to protect cylinders and pipelines.   Precautions Safety valves must not be isolated: it is forbidden to install globe valves in front of safety valves (unless interlocked and protected). Direction of media discharge: Flammable/toxic gases need to be directed to a safe area (e.g. flare system). Periodic calibration: Safety valves need to be calibrated according to regulations (e.g. annually).

Selecting the right pressure reducer is critical to ensuring equipment longevity and operational safety. Below are the five key parameters that determine the performance and safety of a pressure reducer, as well as detailed recommendations when making a purchase: 1. Material and corrosion resistance The material of the pressure reducer has a direct impact on its corrosion resistance and service life, especially when dealing with corrosive gases (e.g. nitrogen dioxide, chlorine, etc.): Valve body and key components: 316L stainless steel is recommended for its excellent corrosion resistance and mechanical strength. Seals: Polytetrafluoroethylene (PTFE) or perfluoroether rubber (FFKM) are suitable for highly corrosive environments. High purity gas application: If the gas purity is ≥99.999% (Five nines), it is recommended to use BA grade or EP grade stainless steel.   2. Pressure adjustment range and stability Input/output pressure: need to match the actual demand, such as high-pressure applications (such as 40MPa) can choose piston pressure reducer (such as RF4 series). Adjustment accuracy: the output pressure fluctuation of high-quality pressure reducer should be ≤ ± 0.01MPa. Safety test pressure: usually 1.5 times the maximum input pressure, to ensure the safety of equipment in extreme conditions.   3. Flow rate and CV value CV value: represents the flow capacity of the pressure reducer, the higher the CV value, the higher the flow. For example, CV=0.08 is suitable for medium flow requirements, while CV=0.06 may be suitable for high pressure low flow scenarios. Dynamic and static pressure difference: If the difference is too large, it may indicate improper flow selection.   4. Safety performance and protection measures Overpressure protection: some high-end pressure reducers are equipped with automatic cut-off or pressure relief function. Leakage rate: high purity gas applications require very low leakage rates (e.g. ≤2×10-⁸ atm cc/sec He). Anti-reflux design: Some pressure reducers have built-in filters (10μm) to prevent contaminants from entering the system.   5. Installation and compatibility Connection type: common such as 1/4’ NPT (F), make sure to match the existing piping. Installation form: panel, wall or pipe bracket installation, according to the space layout to choose. Gauge Configuration: Cylinder pressure reducers are usually equipped with dual inlet and outlet gauges, while piped pressure reducers can be equipped with outlet gauges only.   Additional considerations Brand and after-sales service: AFKLOK usually provides more reliable technical support and warranty service. Temperature adaptability: the operating temperature range should cover the operating environment (e.g. -40°C to +74°C). Maintenance intervals: Stainless steel pressure reducers typically have a life expectancy of 1 year or more, but require regular servicing.

If your pressure reducer is experiencing erratic pressure, it is indeed possible that the unit is in need of inspection or maintenance. Below are possible causes and corresponding solution suggestions to help you quickly troubleshoot the problem: Common Causes and Solutions   Wear and tear of the internal components of the pressure reducer Phenomenon: High pressure fluctuations and failure of the adjustment knob. Cause: Diaphragms, springs or valve seals are deteriorating. Treatment: Replace the worn parts after disassembling and inspecting (recommended to be operated by professionals).   Unstable intake pressure Phenomenon: Output pressure changes drastically with input pressure. Check point: Confirm whether the pressure of the upstream air source is stable, and install a pressure regulator valve if necessary.   Excessive change of outlet load Phenomenon: Frequent starting and stopping of gas-using equipment leads to sudden pressure changes. Solution: Increase the gas storage tank on the outlet side to buffer the pressure fluctuation, or choose the pressure reducer with larger flow specification.   Clogging or freezing of impurities Phenomenon: Sluggish pressure regulation, accompanied by poor airflow. Treatment: clean the filter, drain the pipeline water; low temperature environment need to add electric heaters to prevent freezing.   Improper selection Phenomenon: Long-term overload operation leads to performance degradation. Suggestion: Check whether the rated flow rate and pressure range of the pressure reducer match the actual demand.   Quick self-test steps Observe the pressure gauge: record the input and output pressure value, confirm whether the fluctuation is out of the normal range. Watch for leaks: Use soapy water to coat the ports and watch for bubbles. Listen for strange noises: If there is a gas leak, it may be a seal failure. Manual Adjustment: Try adjusting the knob slowly to check the pressure response. Troubleshooting the gas end: Turn off the downstream equipment and observe whether the pressure returns to stability to determine whether it is a load problem.   Maintenance Tips Regular Maintenance: Check seals and clean cartridges every 3-6 months. Replacement of consumables: Rubber seals are recommended to be replaced once every 1-2 years (depending on the frequency of use). Professional calibration: Precision application scenarios require periodic delivery of pressure accuracy checks.   If the above steps still can not solve the problem, or the equipment has serious leakage / damage, it is recommended to contact the manufacturer or professional maintenance personnel to deal with, to avoid potential safety hazards.   Tip: Be sure to cut off the gas source and relieve the pressure before operation! Safety first!

Cylinder couplings are made of nickel-plated brass instead of pure brass, mainly based on the following advantages: 1. Significantly improve corrosion resistance Limitations of brass: brass (copper-zinc alloy) itself is susceptible to moisture, acidic or alkaline media corrosion, long-term use may produce patina or oxide layer, resulting in a decline in sealing or contamination of the medium. Advantage of nickel plating: nickel layer has excellent corrosion resistance to water, oxygen, weak acids and alkalis and some chemical media, especially suitable for high-pressure gases, high-purity gases or corrosive environments (e.g., industrial, medical fields).   2. Enhanced wear resistance and sealing The hardness of nickel is higher than brass (nickel hardness is about HV200-300, brass is about HV100-120), nickel-plated joints are more resistant to repeated insertion and removal, friction, and prolong the service life. The smooth surface of nickel-plated layer can reduce the microscopic leakage of the sealing surface and enhance the airtightness, which is crucial for high pressure or flammable and explosive gases (e.g. hydrogen, oxygen).   3. Protection against copper ion contamination In the food, pharmaceutical or electronics industries, copper ions can contaminate high-purity gases or liquids (e.g. semiconductor manufacturing, oxygen for breathing). Nickel plating blocks copper migration and meets cleanliness requirements.   4. Aesthetics and tarnish prevention Brass is easy to oxidise and tarnish, nickel plating maintains a silvery-white metallic luster for a cleaner appearance, which is suitable for occasions where aesthetics are required (e.g. laboratory equipment).   5. Balance of cost and performance Full nickel fittings are too costly, while nickel-plated brass retains the good machinability of brass (easy to form, low cost) while improving key performance through surface treatment, which is more cost-effective. Typical application scenarios High-pressure gas cylinders: such as industrial oxygen, acetylene, argon, etc., need to prevent corrosion and sealing. Medical equipment: avoid copper contamination and need frequent disinfection (nickel plating resistant to alcohol, disinfectant). Special environment: marine, chemical and other humid or corrosive occasions. Precautions Plating quality: If the nickel plating process is poor (e.g. insufficient thickness, poor bonding), it may peel off and accelerate corrosion. Select plating that meets standards (e.g. ASTM B733). Compatibility: some media (such as hydrogen sulphide) may react with nickel, it is necessary to choose other plating (such as chromium plating) or stainless steel.   In summary, nickel-plated brass fittings outperform pure brass in most scenarios and are the preferred solution for reliability, economy and safety.

Stainless steel pipes are classified into BA grade (Bright Annealed) and EP grade (Electro Polished) mainly to meet the requirements of different application scenarios for pipe surface cleanliness, corrosion resistance and roughness. These two grades have different treatment processes and are suitable for different industrial environments, especially in high purity gas or liquid transport systems. It can be distinguished from the following four aspects. 1. Different surface treatment processes BA grade (bright annealing): high-temperature heat treatment under the protection of reducing atmosphere (such as hydrogen or argon), eliminating the internal stress of the steel pipe, and at the same time, forming a passivation film, so that the surface is smooth and clean, and the roughness Ra ≤ 0.4 μm.   EP grade (electrolytic polishing): on the basis of BA tube, further electrochemical polishing treatment is carried out to make the surface smoother, with roughness Ra ≤ 0.15 μm, and to enhance corrosion resistance.   2. Cleanliness and corrosion resistance BA grade is suitable for high purity gas transport (e.g. semiconductor, pharmaceutical industry), but EP grade is suitable for ultra-high purity environment (e.g. microelectronics, optoelectronics industry) due to electrolytic polishing, which makes the surface smoother and reduces the particle adhesion. EP grade has better corrosion resistance than BA grade due to the formation of a denser chromium oxide film after electrochemical polishing.   3. Cost and applicable industries BA grade has lower cost and is suitable for most high purity gas systems (e.g. compressed air, chemical delivery). EP grade is more costly and is mainly used in areas with extremely high cleanliness requirements (e.g. semiconductor wafer manufacturing, biopharmaceutical WFI systems).   4. Physical properties BA grade retains some mechanical strength and is suitable for piping systems that require some toughness6. EP grade may slightly reduce the material thickness due to the polishing process, and is suitable for applications where very low fluid resistance is required.   To summarise The division between BA and EP grades is based on different surface treatment processes and application requirements. BA grades are suitable for general high-purity environments, while EP grades are suitable for ultra-high-purity and highly corrosive media transport, such as semiconductors, biopharmaceuticals and other industries.

Selecting the right stainless steel pressure gauge for your use requires comprehensive consideration of a number of factors, including the measurement environment, media characteristics, accuracy requirements, installation methods and so on. The following are the key selection points: 1. Determine the measurement range and range Stable pressure: the maximum working pressure does not exceed 2/3 of the range. Pulsating pressure (such as hydraulic systems): the maximum working pressure does not exceed 1/2 of the range. High pressure measurement: max. working pressure not exceeding 3/5 of the measuring range. Minimum pressure: not less than 1/3 of the measuring range to ensure measurement accuracy.   2. Selecting an Accuracy Level For high accuracy requirements (e.g., aerospace, laboratory): select Class 1.0 or Class 1.6. General industrial applications (e.g., water supply and drainage, boilers): Class 2.5 is sufficient. 3. Consider media characteristics Corrosive media (e.g. acids and alkalis, chemical fluids): choose 316 or 316L stainless steel, or even titanium or monel alloys. Viscous or easily crystallised media: choose diaphragm gauges to prevent clogging. High-temperature media: stainless steel movement can withstand +200°C, but the liquid-filled shock-resistant type can only support +100°C, and condensation bends are required for ultra-high temperatures. 4.   4. Dial size and mounting method Small space installation (such as equipment panel): 50mm or 60mm dial. Remote observation (e.g. pipeline monitoring): 100mm or 150mm dial.   Mounting method: Radial connection (bottom mounting). Axial connection (back mounting). Flange or clamp mounting (special requirements). 5. 5. Vibration Resistance and Protection Requirements High vibration environments (e.g., machine shop, marine): Select a liquid-filled, vibration-resistant gauge to minimise pointer jitter. Wet or corrosive environments: Ensure IP65 or higher protection against water vapour.   6. Thread and Connection Standards Common thread sizes: M14 x 1.5, G1/4, NPT1/2, etc., need to match the equipment interface.   7. Maintenance and Calibration Check regularly (at least every 3 months) to ensure the accuracy of the measurement. When installing, avoid screwing the case by hand and use a spanner to prevent damage.   To summarise When selecting a stainless steel pressure gauge, it is important to take into account the measuring range, accuracy, media, environment, and mounting method to ensure stability, durability, and measurement accuracy. For special conditions (e.g. extreme temperatures, strong corrosion), diaphragm seals or customised models can be considered.

Selecting the right check valve for industrial applications requires comprehensive consideration of fluid characteristics, operating conditions, installation requirements and valve performance and other factors. The following are detailed selection steps and considerations: 1. Define the fluid characteristics Type of medium: liquid, gas, vapour or slurry? Corrosive, viscous or containing particles? Corrosive media: selection of corrosion-resistant materials (such as stainless steel 316, Hastelloy, PTFE lining). High viscosity or containing particles: preferred spin or ball check valve, avoid disc type (easy to clog). Temperature and pressure: high temperature and pressure need to choose metal seal (such as spring-assisted lift valve), low temperature and low pressure can be plastic or rubber seal.   2. Key operating parameters Pressure Rating: Ensure that the rated pressure of the valve (PN/Class) is ≥ the maximum system pressure, and take into account pressure fluctuations. High-pressure systems (such as hydraulic systems) need to use forged valve body.   Temperature range: Sealing materials need to match the temperature (e.g. NBR rubber for -30°C ~ 80°C, PTFE for -200°C ~ 260°C).   Flow requirements (Cv value): Calculate the required Cv value to avoid excessive valve pressure drop affecting system efficiency. 3. Material selection Valve body material: Carbon steel (economic, suitable for non-corrosive media). Stainless steel 304/316 (general corrosion resistance). Special alloy (such as titanium, monel, for strong acid and alkali environment).   Sealing materials: EPDN (water and steam resistant), FKM (oil resistant), PTFE (chemical resistant).   4. Installation and maintenance Installation direction: Lift type valves must be installed in the direction of the arrow, swing type needs to be installed horizontally.   Space limitation: Compact space select butt-clamp type or short structure valve (such as disc type).   Maintenance Convenience: Split design for easy cleaning (e.g. food/pharmaceutical industry).

Safety valves and pressure relief valves are both devices used for pressure system protection, but they differ in their operating principles, application scenarios and functions. Correctly differentiating and selecting the right pressure setting is critical to system safety. Difference between safety valve and pressure relief valve 1. Function and Principle of Operation Characteristics Safety Valve Relief Valve Primary Purpose Preventing explosion or equipment damage due to overpressure (safety protection) Maintaining stable system pressure (process control) Principle of operation Full-opening type: Instantaneous full opening when pressure reaches the set value. Rapid pressure relief Gradual: gradually open the valve with the rise of pressure, and gradually close it after the pressure is lowered. Pressure relief method One-time large amount of relief medium (such as steam, gas) Small flow continuous or intermittent relief (such as liquids, compressible fluids) Reset mode Manual reset Automatic reset       Applicable Scenarios Safety valves: used in high-pressure, high-risk situations (such as boilers, pressure vessels, chemical pipelines), to cope with sudden overpressure. Pressure relief valves: used in systems that require precise pressure control (such as hydraulic systems, water supply networks), regulating pressure fluctuations.   Standards and certification Safety valves are normally subject to stringent standards (e.g. ASME, API, GB/T 12241). Pressure relief valves may comply with general pressure control standards (e.g. ISO 4126).   How to choose the right pressure setting 1. Determine the key parameters Set pressure (Set Pressure): the pressure at which the valve starts to operate. Safety valve: ≤ system design maximum pressure (usually 1.1 ~ 1.2 times the working pressure). Pressure Relief Valve: Slightly higher than the normal working pressure (e.g. 1.05~1.1 times the working pressure). Reseat Pressure: the pressure when the valve is closed (the safety valve needs to be checked to see if it meets the system recovery requirements). Overpressure allowable value: generally not more than 10% of the system design pressure.   2. Selection Steps Evaluate the system requirements: Is it for sudden overpressure (select safety valve) or continuous regulation (select pressure relief valve)? Media type (gas/liquid/steam) and flow requirements.   Refer to regulatory standards: For example, boiler safety valves need to comply with ASME Section I or GB/T 12243.   Calculate the pressure threshold: Safety valve set pressure ≤ vessel maximum allowable working pressure (MAWP). Relief Valve Set Pressure = Normal Working Pressure + Safety Margin (5~10%).   Verify relief capacity: Ensure that the valve relief ≥ the maximum possible overpressure flow rate of the system (e.g., flow rate in case of pump/compressor failure).   3. Other considerations Media characteristics: corrosive media need to use special materials (such as stainless steel, Hastelloy). Environmental requirements: explosion-proof, low or high temperature environment requires special design. Testing and maintenance: safety valves need regular mandatory calibration (such as once a year), pressure relief valves can be online debugging.