In key industries such as petroleum and chemical, selecting ball valves that meet standards is the key to ensuring safe and reliable operation. API 607 ​​(fire safety) and API 608 (general sealing) are the two core performance standards in the field of ball valves. A deep understanding of the core differences and application scenarios between the two is the cornerstone to ensure accurate selection for your working conditions.

Why API 607 ​​and API 608 are important for ball valve selection?

Core guarantee of safety, reliability and compliance

1. Personnel and equipment safety: Valve failure may lead to leakage, fire, explosion or environmental pollution, with disastrous consequences.
2. System reliability: Valve performance directly affects the continuous and stable operation of the process, and unexpected downtime will cause huge losses.
3. Regulatory compliance and project acceptance: Industry specifications and project design documents have mandatory requirements for valve standards, and failure to comply will result in failure to pass acceptance.
4. Long-term operating costs: Improper selection may lead to premature valve failure, frequent maintenance, and increased total cost of ownership.

Accurate selection is the key cornerstone to avoid risks

• API 607: Specializing in safety assurance under extreme risks

• Core value: Fire safety. It defines the minimum performance requirements that ball valves must meet when exposed to accidental fire. The standard uses rigorous tests that simulate real fire scenarios (external fire, internal media leakage, etc.) to verify whether the valve can:
  • Maintains external seal (housing integrity): Prevents fire from spreading or causing a larger disaster.
  • Controlling internal leakage rate: Even if the internal soft seal is partially burned, the metal-to-metal secondary seal should be able to limit the leakage to an acceptable range, reducing the fuel supply.
  • Maintain operability: Valves should remain operable (e.g. emergency shut-off) during or after a fire.
• Importance: In high fire risk areas such as refineries, offshore platforms, chemical plants, oil/gas pipelines, etc., API 607 ​​certification is a mandatory or strongly recommended bottom line requirement. Choosing a ball valve that is not API 607 ​​certified means that when a fire occurs, the valve is likely to become a weak link in the safety chain, leading to catastrophic consequences. It is about survivability in the worst case scenario.

• API 608: Setting the benchmark for universal reliability

• Core value: reliable sealing and basic performance. It specifies the general performance requirements that ball valves should meet under design conditions (normal temperature and pressure), including:
  • Bidirectional sealing: When the valve is closed, both the upstream and downstream sides should be able to effectively prevent medium leakage.
  • Valve body strength: Able to withstand rated pressure without deformation or cracking.
  • Operating Torque: The force required to open and close the valve should be within a reasonable range to facilitate operation and not damage the actuator.
  • Basic specifications such as size, pressure rating, end connections, materials, etc.: Ensure that the valve can be installed correctly and adapt to the basic system parameters.
• Importance: API 608 provides a unified performance and quality benchmark for ball valves in a wide range of industrial applications (such as water treatment, HVAC, general process piping, low-pressure utilities, etc.). It ensures that the valve can be reliably closed/opened, leak-free, and easy to operate in daily operation, meeting the basic functional requirements of the system. Choosing a valve that does not comply with API 608 means that you may face problems such as daily leakage, operational difficulties, and short life, which directly affects system efficiency and maintenance costs. It is about the stability and reliability of daily operation.

To summarize its key importance:

• Clear goals and irreplaceable: API 607 ​​focuses on fire safety (extreme working conditions), while API 608 focuses on basic sealing and performance (normal working conditions). The two solve core problems at different levels and cannot replace each other.
• Risk-oriented: API 607 ​​is a safety “fuse” in high-risk environments; API 608 is a “quality guarantee” to ensure reliable operation of general applications. Choosing the wrong standard means taking unnecessary risks (safety or operation).
• Compliance Basis: Many industry codes (such as ASME B31.3) and project specifications clearly require that valves that comply with API 607 ​​or API 608 must be used in specific situations. Following the standards is a hard requirement for compliance.
• Starting point for selection decision: Understanding the primary question “Does my application require fire protection?” directly determines whether to select according to API 607 ​​or API 608. They are the first key branches on the selection logic tree.

Therefore, ignoring the differences between API 607 ​​and API 608, or incorrectly selecting the applicable standard may not only lead to non-compliance of the project and unreliability of the system, but may also lead to major safety hazards or unnecessary economic losses. They are the core standards that engineers and purchasers must first understand and apply when selecting ball valves.

In-depth analysis of API 607: What are the core requirements for fire safety?

API 607 ​​core objectives: key performance assurance under fire conditions

API 607 ​​is not an ordinary performance standard, but a survivability specification specifically formulated for fire emergency conditions. Its core goal is to achieve three life-saving functions when the valve is exposed to an unexpected fire.

1. Control the spread of the disaster (prevent the shell from rupturing and causing a secondary explosion);
2. Cut off the fuel supply (limit the leakage of internal medium);
3. Maintain the emergency operation window (ensure manual/automatic shutdown is still possible during a fire).

API 607 ​​Fire Test Requirements Detailed Explanation (Based on API 607 ​​6th Edition)

💡 Key point: After the test, the valve is allowed to be deformed or even partially damaged, but the leakage must be controllable + the operation must be feasible – this is the essential difference from the conventional performance standards!

API 607 ​​Valve Key Design Features

To meet fire protection requirements, valve designs usually include:

• Metal auxiliary sealing system: After the primary soft seal (such as PTFE) is burned out, the metal valve seat and the ball form a secondary seal.
• High temperature adaptable components: The valve stem packing is made of graphite or stainless steel to avoid high temperature expansion and jamming; high temperature resistant alloys are used in key parts.
• Enhanced structural strength: Thickened design in key pressure-bearing areas to resist thermal stress deformation.
• Fire safety structure: Avoid liquid accumulation in the middle cavity (to prevent explosion due to thermal expansion)

Mandatory application scenarios and industry specifications of API 607

Compliance with API 607 ​​is a mandatory requirement of regulations or specifications for the following high-risk scenarios:

• Oil and gas: offshore platforms, refinery process areas, LNG facilities, and key nodes of oil and gas pipelines.
• Chemical industry: Pipelines handling flammable, explosive or toxic media (such as olefins, benzene).
• Critical safety systems: Fuel emergency shut-off valves, process isolation valves, fire protection system valves.
• Related specification references: API 6D (Pipeline Valves), API 6FA (Valve Fire Test), ASME B31.3 (Process Piping) and other standards clearly stipulate that API 607 ​​certified valves must be used in specific areas.

API 607 ​​Certification Identification and Verification

When purchasing, please verify:

1. Valid third-party test report: issued by an independent laboratory (such as DNV, UL, SGS) according to the latest version of API 607, covering the required valve specifications (size, pressure class).
2. Product Identification: The valve body is usually engraved with the “API 607 ​​FIRESAFE” logo and the certification agency logo.
3. Manufacturer Qualification: The manufacturer must hold a valid API Q1 quality management system certification (as the basis for production in compliance with API product standards).

API 608: What is the benchmark for general sealing and performance?

API 608 core goal: ensuring reliability and safety in daily working conditions

API 608 is the basic performance standard for general industrial ball valves. Its core is to verify whether the valve can meet the following requirements within the design temperature and pressure range:

1. Bidirectional zero leakage seal: blocks the bidirectional flow of media in the closed state (low pressure difference working condition);
2. Structural integrity: withstand rated pressure without deformation or cracking;
3. Operational feasibility: The opening and closing torque is within a reasonable range to avoid excessive wear or actuator overload.

⚙️ Key positioning: Unlike API 607’s “fire survival”, API 608 focuses on the functional reliability of valves in routine operation

API 608 core performance requirements explained

API 608 Critical Design Ranges for Valves

The standard covers the following general technical parameters and provides a benchmark for selection:

• Size range: DN 15 ~ DN 600 (NPS ½” ~ 24″);
• Pressure rating: Class 150 ~ Class 1500 (PN 20 ~ PN 250);
• End connections: flange (ASME B16.5/B16.47), threaded (ASME B1.20.1), butt welding (ASME B16.25);
• Applicable temperature: -29°C to 200°C (exceeding the range requires special design, non-standard coverage).

⚠️ Note the limitations:

• Not suitable for ultra-low temperature (LNG) or high temperature steam (>200°C);
• No fire resistance is required (if fire resistance is required, it must comply with API 607);
• It does not cover special corrosion resistance verification (e.g. chloride ion corrosion requires reference to NACE MR0175).

Typical application scenarios of API 608

API 608 is the preferred standard for the following general industry sectors:

• Water treatment system: municipal water supply, cooling water pipelines, sewage treatment plant valves;
• Heating, ventilation and air conditioning (HVAC): chilled water/hot water circulation system, fan coil connection valve;
• General process pipelines: non-corrosive media (water, air, oil) in food, beverage and pharmaceutical industries;
• Low-pressure utility projects: compressed air pipelines, fire water pipe networks, low-pressure steam systems (≤200°C);
• Building mechanical and electrical system: pump room control valve, water tank inlet and outlet valves.

✅ Advantages: In scenarios without fire risk and non-extreme working conditions, API 608 valves provide cost-effective and reliable sealing solutions.

API 608 Certification Identification and Purchasing Key Points

1. Product identification: The valve body is engraved with the “API 608” mark and pressure grade (such as CL150);
2. Material report: provide material certification of pressure-bearing parts (ASTM A216 WCB/A351 CF8, etc.);
3. Test certificate: Manufacturer’s factory seal and housing test report (not mandatory for third parties);
4. Declaration of Conformity: The manufacturer’s written commitment to comply with the latest edition of API 608 (currently API 608 4th Edition, 2021).

API 607 ​​vs API 608: How do the core differences determine your choice?

Core goal comparison: safety redundancy vs basic performance

Differences in testing requirements: extreme verification vs. standard verification

Design feature comparison: Redundancy and safety vs. cost-effectiveness

Cost and compliance trade-off

API 607 ​​vs API 608 Key Comparison Chart (Quick Decision Reference)

How to accurately choose API 607 ​​or API 608 according to working conditions?

Application scenario demarcation: risk level determines standard selection

Selection decision process based on working conditions (step-by-step determination):

1. First judgment: Is there a fire risk?
   → There is a fire risk (involving flammable and explosive media such as oil, gas, hydrogen, benzene, or high-temperature process areas):
   • API 607 ​​is mandatory (regulatory basis: ASME B31.3 §323.2.2 / API 6D §6.2.1).
     → No fire risk (medium is water, air, non-flammable liquid): Go to the next level of judgment.
2. Second priority: Is it located in a high-risk industrial area?
   → Yes (Oil platform, chemical plant core area, LNG storage tank area):
   • API 607 ​​is mandatory (mandatory requirement of industry standards).
     → No (general industrial plant, municipal facilities, building machine room): Go to the next level of judgment.
3. Parameter Verification: Is it within API 608 design range?
   → Pressure ≤ Class 1500 & Temperature -29°C to 200°C:
   • API 608 is preferred (applicable to water treatment, HVAC, compressed air, etc.).
     → Out of range (ultra-low temperature LNG, high temperature steam > 200°C, highly corrosive media):
   • Special design is required (refer to standards such as API 6D or NACE MR0175).

High-frequency scenario selection comparison table (quick reference guide)

Instant warning of selection errors (Red Flags)

⚠️ The selection process will be terminated and reviewed immediately if the following situations occur:

• Flag 1: The medium is flammable but API 608 is considered → Risk of violation (API 607 ​​must be selected)
• Flag 2: Temperature > 200°C and API 608 is still used → valve failure (API 6D is required)
• Flag 3: Using API 608 on oil and gas platforms to save money → safety incidents + legal prosecution

Make smart valve decisions for safety and efficiency

The balance between safety and efficiency:

When the working conditions involve flammable media, high-risk areas or regulatory requirements (ASME B31.3/API 6D), choose API 607 ​​unconditionally – zero compromise on safety;

In low-risk scenarios where the media is harmless and the parameters are compliant (temperature -29~200°C/pressure ≤Class 1500), API 608 is firmly selected – 30% cost reduction + no performance sacrifice;

Special designs are implemented for ultra-limited working conditions to prevent failures caused by forcing standards.

The ultimate criterion: safety weight always exceeds efficiency weight, and regulations exceed costs.

Preguntas frecuentes

Q1 : Are API 608 valves completely non-fireproof?

A1: Misconception.

• Fact: Fire certification is not mandatory for API 608 valves, but some designs (such as metal seats) may have basic flame retardancy.
• Diferencias clave:

• Conclusion: API 607 ​​must be used in high-risk areas; accidental flame retardancy of API 608 does not equal fire safety.

Q2 : Can valves that comply with API 607 ​​replace API 608?

A2: Technically feasible, but economically wrong.

• Availability: API 607 ​​valves meet all common performance requirements of API 608 (bidirectional sealing/strength/torque).
• Financial penalties:
  • Procurement costs increased by 30%-50%;
  • Maintenance advantage only in long term operation (metal seal life > soft seal).
• Decision-making principles:
  “Using API 607 ​​in risk-free scenarios is over-engineered and violates the law of cost efficiency.”

Q3 : Is price the only determining factor in selection?

A3: Absolutely wrong.

• Short-term cost trap:

• Full-cycle cost formula: Total cost = purchase price + (accident probability × accident loss) → Safety weight always takes precedence over purchase price.

Q4 : Does API 607 ​​certification only apply to ball valves?

A4: The standard has a wider scope of application.

• Cover valve type:
  • Ball valve (mainstream)
  • Butterfly valve (new in API 607 ​​6th Edition)
  • Válvula de tapón
• Drain valve type:
  • Gate valve/stop valve (API 6FA required)
  • Control valve (IEC 61508 certification required)

Q5 : How to verify that the valve complies with API 607 ​​or API 608?

A5: Three-step confirmation method:

1. API 607:
   • Valve body engraved with “API 607 ​​FIRESAFE” + third-party report (DNV/SGS);
   • The certificate covers the actual specification (e.g. NPS 12” Class 300).
2. API 608:
   • The valve body is engraved with “API 608” mark + factory test report;
   • Material certification (ASTM A216 WCB etc.).
3. Common requirements:
   • The manufacturer holds a valid API Q1 system certification.

Q6 : Is it credible if a non-certified valve is marked “Fire Safe”?

A6: Don’t trust it, be careful!

• Compliance requirements:
  • The “Fire Safe” claim must be accompanied by an API 607/6FA certification number;
  • No number is considered false advertising (violation of ASME PCC-1).
• Legal risks:
  Using uncertified “fire dampers” leads to accidents → the manufacturer bears 100% responsibility.

Q7 : Can API 608 be modified to meet API 607?

A7: Not feasible.

• Core obstacles:
  • Fire protection design needs to be natively integrated (such as metal secondary containment systems);
  • The modification failed the fire test (shell structure not strengthened).
• The only path:
  Directly source API 607 ​​certified valves.

Q8 : Does the difference in standard versions affect the selection? (e.g. API 607 ​​6th vs 5th)

A8: Significant impact!

JH-Valve has been deeply involved in the manufacture of industrial ball valves for 60 years, JH valves strictly follow the API 607 fire certification (third-party DNV fire test) and API 608 sealing standard (ISO 5208 Rate Class A), relying on the API Q1 quality system to provide full-condition solutions for the petroleum, chemical and power industries: API 607 certified ball valves (shell explosion-proof + metal secondary sealing) are configured for high fire risk scenarios, and API 608 standard Class is used for general sealing scenarios 150~2500 ball valve (zero leakage in both directions), support API 6D pipeline customization and TA-Luft Class A leakage prevention process, immediately provide parameters to get an exclusive quotation, let JH-Valve API compliant ball valve with millions of life become the core cornerstone of your safety system!