Ningbo Sanmin Import And Export Co.,Ltd.
| Supply Ability | 10000PCS |
| Delivery Time | 5-30days |
| Packaging Details | Box |
| Payment Terms | L/C,T/T |
| Material | Cast iron |
| Pressure | 35bar |
| Application | Automatic pressure relief protection device |
| Warranty | 1 Year |
| Power type | Air |
| Brand Name | NBSANMINSE |
| Model Number | A28 H - 25 |
| Place of Origin | CHINA |
| Certification | ISO9001 |
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Product Specification
| Supply Ability | 10000PCS | Delivery Time | 5-30days |
| Packaging Details | Box | Payment Terms | L/C,T/T |
| Material | Cast iron | Pressure | 35bar |
| Application | Automatic pressure relief protection device | Warranty | 1 Year |
| Power type | Air | Brand Name | NBSANMINSE |
| Model Number | A28 H - 25 | Place of Origin | CHINA |
| Certification | ISO9001 | ||
| High Light | N Type cast iron safety valve ，35bar spring safety valve ，wrench-operated pneumatic safety valve | ||
| Attribute | Value |
|---|---|
| Material | Cast iron |
| Pressure | 35bar |
Suitable for gas, liquid and steam with operating temperature ≤250℃. Used as overpressure protection device for medium equipment or pipes.
Manufacturing standard: GB/T12243-2021 "Spring loaded safety valves"
Suitable for equipment or pipelines with liquid and other medium operating temperature ≤200℃, used as overpressure protection device.
Manufacturing standard: GB/T12243-2021 "Spring loaded safety valves"
A safety valve is a fail-safe device that automatically releases fluid from a system, such as a pressure vessel or boiler, when its pressure or temperature exceeds a preset limit to prevent damage or explosion. It acts as a final line of defence, protecting equipment, property, and lives by discharging excess fluid and then automatically reclosing once normal operating conditions are restored.
How a Safety Valve Works
Receiving Pressure: The valve's nozzle receives high pressure from the system's inlet.
Opening: When the system pressure exceeds the set point, a disc is forced open, allowing the excess fluid (like steam or gas) to discharge.
Closing: As the pressure decreases to a safe level, the spring or other mechanical force closes the disc, stopping the flow of fluid.
Key Characteristics
Fail-Safe: It is designed to operate automatically without external power.
Protective Device: Its primary purpose is to prevent overpressure and potential catastrophic failures.
Last Line of Defence: Safety valves are often the final safety measure in a system, ensuring safety under extreme conditions.
Automatic Reset: After relieving the excess pressure, the valve recloses to the normal operating state.
Why They Are Necessary
Overpressure Prevention: Systems can experience dangerous pressure increases due to various reasons, such as equipment malfunctions or process upsets.
Equipment Protection: Safety valves safeguard pressure vessels, boilers, and other systems from damage or explosive failure.
Personnel and Property Safety: By preventing overpressure, they protect the lives of people in and around the facility and prevent damage to infrastructure
Q: Could you offer the free samples ?
A: Yeah, but it depends products, Pls contact us ina@pneuhydr.com or whatsapp 0086 15168536055
Q: What ' s your business scope ?
A: Our business scope is service of exporter automation parts with full container, and sell air cylinder , air source treatment , solenoid valve , air valve, motorize valve , Brass valve, hydraulic valve, hydraulic cylinder, air and oil fitting, pressure gauge etc .
Q: What types of products you can make ?
A: We can make many kinds of stainless steel, brass ,aluminum materials processing .like high pressure Valve / solenoid valve / electric valve / water valve/pneumatic valve/air cylinder/hydraulic valve/hydraulic accumulator products and so on .
Q: Can the product be made with our logo and brand ?
A: Yes , of course , we can make . we are OEM supplier for years and professional to make . But you need give us the authorization if it is possible .
Q:Can you provide original famous pneumatic and hydraulic,instruments brand goods ?
A: Yes,We can supply like Festo,Smc,Ckd,Burket,Hydac,Rexroth,Siemens,Rosemount,Marsh ,Endress+Hauser etc.
Q: Is there a warranty available?
A: Yes, normally products is one year quality guarantee.
Q: Is the connector in British or Metric system? What is the difference between PT, NPT, and G threads?
A: The G thread is cylindrical and does not seal itself, requiring additional gaskets to prevent leakage. PT and NPT are conical, and the internal and external threads become tighter and tighter when tightened. Sealing is achieved through the deformation of the threads, and sealant or tape is usually used in conjunction to enhance the sealing effect
G-thread is a cylindrical straight pipe used for non sealed connections; PT thread is a conical tube that relies on the deformation and sealing of the thread itself; NPT is also a conical tube with a tooth profile angle of 60 degrees, mainly used in North America
Q: How to convert pressure units: MPa, bar, psi, kg/cm ²?
A: 1MPa=10bar≈145psi≈10kg
Q:What usually causes the burnout of solenoid valve coils?
A:Incorrect voltage and hz, frequent switching, pilot head entering liquid,valve core and spring problem,environment hot,heavy vibration etc.
Q: What should be noted for pneumatic components in high temperature or extremely cold environments?
| Focus Point | High Temperature Environment Countermeasures | Extreme Cold Environment Countermeasures |
| Seals | Fluororubber, PTFE | Low-temperature nitrile, silicone rubber, polyurethane |
| Lubrication | High-temperature synthetic grease (low volatility) | Low-temperature grease (low pour point, low viscosity) |
| Air Supply Treatment | Strengthen cooling, efficient water removal | Ultra-low dew point drying (refrigeration + adsorption type), heat tracing |
| Metal Components | Reserve expansion clearance | Select materials with low-temperature toughness, prevent leakage due to cold shrinkage |
| Control Components | High heat-resistant grade coils, heat dissipation, low power consumption | Install insulation boxes, local heating, prevent cold condensation |
| Installation | Keep away from heat sources, add heat insulation plates | Avoid exposure to wind and snow, wrap with thermal insulation materials |
Company Details
Business Type:
Manufacturer,Distributor/Wholesaler,Importer,Exporter,Trading Company,Seller
Year Established:
2014
Total Annual:
2000000-3000000
Employee Number:
15~20
Ecer Certification：
Verified Supplier
NINGBO SANMIN IMPORT & EXPORT CO.,LTD. was established in 2014.Our company is mainly engaged in instrumentation, pneumatic and hydraulic industry accessories and services, has more than 10 series of core products.Focusing on the production of automatic machinery to provide a variety of options, ... NINGBO SANMIN IMPORT & EXPORT CO.,LTD. was established in 2014.Our company is mainly engaged in instrumentation, pneumatic and hydraulic industry accessories and services, has more than 10 series of core products.Focusing on the production of automatic machinery to provide a variety of options, ...
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