Standard for anti-static requirements of soft-sealed ball valves

It is specified in Article 7.7.2 of SH/T 3059-2012 \"Code for Selection of Materials for Petrochemical Piping Design\".

The anti-static requirements for soft-sealed ball valves primarily aim to prevent sparks caused by static electricity accumulation, thereby ensuring safe operation in flammable and explosive environments. The relevant standards and key points are as follows: 1. The international standard ISO 15848 applies to the leakage and sealing performance of industrial valves; some of its provisions address anti-static design, requiring that valves prevent the accumulation of static electricity during operation. IEC 60079-0 (Equipment for use in explosive atmospheres) specifies the general requirements for explosion-proof equipment, including static electricity protection measures (such as resistance value limits). 2. The European standard EN 1349 (Industrial process control valves) covers the antistatic properties of valves, requiring that such valves dissipate static electricity in hazardous environments. The ATEX Directive (2014/34/EU) applies to equipment used in explosive environments, requiring valves to pass anti-static tests (e.g., resistance value ≤ 10⁶Ω). 3. American standards API 607/API 6FA API 607: Applicable to fire testing of soft-sealed valves; some versions include anti-static requirements. API 6D (pipeline valves): Requires valves to be equipped with static discharge devices (e.g., spring-ball contact resistance ≤ 10Ω). ANSI/FCI 87-1 is the anti-static design standard for control valves. 4. The Chinese standard GB/T 12237 (Ball valves for petroleum, petrochemical, and related industries) requires an anti-static design (e.g., resistance between the ball and the valve stem ≤ 10Ω). GB 3836.1 (Electrical equipment for explosive atmospheres) refers to IEC 60079-0 and specifies static electricity protection measures. Key points of anti-static design: Conductive components: A conductive path must be established between the sphere, valve stem, and valve body via metal springs or conductive gaskets. Resistance requirement: The resistance between the sphere, valve stem, and valve body ≤ 10Ω (API 6D). The overall resistance of the valve ≤ 10⁶Ω (ATEX/IEC). Testing method: Use a multimeter to measure the contact resistance to ensure continuity of the circuit. Application scenarios: Flammable media (such as oil and natural gas). Explosive environments (such as the chemical and pharmaceutical industries). Certification requirements: Third-party testing is required (e.g., ATEX certification, UL certification, CE marking). Regularly perform maintenance checks to ensure the integrity of the conductive components. It is recommended to select valves that meet the appropriate standards based on specific operating conditions, and to specify the anti-static performance parameters at the time of purchase.

Just apply an anti-static treatment to the valve stem