Anti Static Ball Valve Description
Anti-static ball valve is a special valve designed for flammable and explosive media, through the valve stem, ball and valve body set between the conductive device to form a low-resistance path (usually required resistance value <10Ω), timely export of friction-generated static charge, to avoid the risk of explosion caused by static electricity build-up.
Structure Design
- Static electricity conduction structure
Conductive spring + steel ball assembly: spring and metal ball are embedded in the contact point of valve stem and ball, valve stem and valve body, constituting the electrostatic conduction path.
Anti-static test requirements: conductive path resistance ≤ 10Ω under 12V DC voltage (GB/T 12237 standard).
- Double sealing system
Soft sealing: PTFE or reinforced PTFE sealing is used in normal working condition to achieve zero leakage.
Hard seal backup: After the soft seal burns out in case of fire, the metal sealing surface (e.g. stainless steel) automatically fits to form an emergency seal.
- Fire safety structure
Lower mounted stem: prevent the stem from flying out when the valve chamber is abnormally pressurised, maintaining structural integrity during a fire.
Graphite metal winding gasket: High temperature resistant sealing material is used in the connection of the valve body to prevent leakage in case of fire.
Anti Static Ball Valve specification
Specification
| Item | Scope |
|---|---|
| Nominal diameter | DN8-DN500 (common DN15-DN300) |
| Pressure rating | PN16-PN100 (or Class 150-600LB) |
| Temperature range | -20°C to +300°C (hard seal up to 450°C) |
| Drive method | Manual, worm gear, pneumatic, electric |
Material
| Parts | Material |
|---|---|
| Valve Body/Bonnet | Forged steel (A216 WCB), stainless steel (304/316/316L), duplex steel (2205) |
| Ball/stem | Stainless steel (SUS304/316L), case-hardened (enhanced wear resistance) |
| Sealing material | Soft seal: PTFE/RPTFE/PEEK Hard seal: stainless steel + tungsten carbide coating |
| Static components | Spring: stainless steel; conductive ball: copper alloy or stainless steel |
Manufacturing Standards and Testing Requirements
- Design and manufacturing standards
Domestic: GB/T 12237 (petrochemical valves), HG/T 20592 (chemical flange standards).
International: API 607 (fire resistance test), API 6D (pipeline valve specification).
- Mandatory testing items
Electrostatic conductivity test: Stem-ball-body resistance ≤ 10Ω under 12V DC.
Fire resistance test: simulate combustion for 30 minutes (760℃) according to API 607, and the seal leakage is up to standard after the test.
Sealing test: air/water pressure sealing test at room temperature and high temperature (GB/T 13927).
Degreasing treatment: Oxygen media valves need to be strictly degreased, residual oil ≤ 125mg/m².
Anti Static Ball Valve
Advantages
- Intrinsically safe
Eliminate the risk of static detonation, explosion-proof grade meets Ex d IIB T4 standard.
- Emergency protection
The hard seal is automatically activated in fire, preventing the medium from leaking and expanding the accident.
- Long life
The hard seal is resistant to particle scouring, with an action life of ≥100,000 times.
- Easy maintenance
Modular design supports quick replacement of seals.
Applications
| Industrial | Applications | Funcation |
|---|---|---|
| Petrochemicals | Pipelines for liquefied gases, olefins, benzene, etc. | Prevent static ignition of explosive media |
| Natural gas transmission and distribution | Gate stations, regulator stations, storage depots | Emergency cut-off in case of fire to safeguard the pipe network |
| Chemical pharmacy | Solvent delivery, reactor feed | Avoid static electricity interfering with precision processes |
| Iron and steel metallurgy | Oxygen pipework (to be degreased) | Eliminate the risk of ignition and explosion, purity protection |
| Aerospace | Fuel filling system | Double protection against explosion + pollution |
Anti-static ball valves through the conductive structure + double sealing technology, flammable and explosive media control of the safety core, in the petrochemical, gas and other fields to assume the role of a key barrier to prevent accidents
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