Shenzhen Wofly Technology Co., Ltd.

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.

In industry, petroleum, chemical industry and daily life, valves are key components for controlling fluid flow. Among them, needle valves and ball valves are two common types of valves, but they have significant differences in structure, function and application scenarios. This article will compare the characteristics of the two in detail, to help users make a more reasonable choice according to the actual needs. 1. Structural differences Needle valve adopts conical needle valve spool, through the fine thread rotation to adjust the spool and seat clearance, so as to accurately control the flow. Its structure is complex, good sealing performance, suitable for high-precision flow adjustment occasions.   The core component of the ball valve is a ball with a through-hole, which can be opened and closed quickly by rotating the ball by 90 degrees. Its structure is simple, convenient operation, suitable for the need to quickly cut off or connect the fluid working conditions. 2. Functional characteristics Flow control: Needle valves are suitable for fine adjustment of small flow, such as laboratory, instrumentation measurement and other scenarios; ball valves are mainly used for fully open or fully closed state, not for precise adjustment.   Sealing: Needle valves have better sealing and can withstand high-pressure environments; ball valves have good sealing when fully closed, but may wear out after long-term use.   Operation: Needle valves need to be adjusted by rotating the handle several times, while ball valves can be switched on and off by rotating 90 degrees only, which makes the operation quicker.   3. Application Scene Needle valve: widely used in petrochemical, electric power system, laboratory instruments and other fields that require precise flow control. Ball valves: commonly used in water supply and drainage systems, natural gas pipelines, HVAC and other occasions that require rapid cut-off of fluids. 4. Comparison of Advantages and Disadvantages Valve type Advantages Disadvantages Needle Valve High Precision Adjustment, Good Sealing Slow Regulation, High Price Ball Valve Quick Opening And Closing, High Durability Not Suitable for Fine Flow Control     Expert Advice Industry experts point out that when selecting a valve, the characteristics of the medium, pressure requirements and frequency of operation should be taken into account. If you need to accurately control the flow, needle valve is the ideal choice; if the pursuit of fast switching and durability, the ball valve is more advantageous.   With the development of industrial automation, smart valves are emerging, but the traditional needle valve and ball valve still occupy an important position because of its reliability and economy. Correct selection not only improves system efficiency, but also extends equipment life and reduces maintenance costs.