Safety Valves for Chemical Processing
Safety relief valves in chemical plants must handle an exceptionally wide range of aggressive media — from concentrated acids and chlorinated solvents to toxic intermediates and reactive chemicals — while providing reliable, repeatable overpressure protection certified to ASME Section VIII. Vajra Industrial Solutions supplies stainless steel, Hastelloy, and PTFE-lined safety relief valves sized to API 520 and designed to API 526, including balanced-bellows designs for high-backpressure relief headers and pilot-operated valves for processes where the safety valve must remain tightly closed at near-set-pressure operating conditions.
Key Applications — Safety Valves in Chemical Processing
Reactor and Pressure Vessel Protection
Safety relief valves on reactor vessels, surge drums, and storage tanks for exothermic reactions, solvent tanks, and polymerisation reactors. Closed-bonnet balanced-bellows design for toxic media (prevent atmospheric release of toxic spring-chamber gas). Hastelloy nozzle and disc for corrosive reaction media. Emergency depressurisation sizing to API 520.
Inlet DN25–DN100, Class 150–600, Hastelloy C-276 / CF8M, balanced-bellows, API 526
Distillation Column and Reboiler Overhead
Safety valves for distillation column overhead receivers, reflux drums, and reboiler shell-side protection. Low-temperature stainless (SS 316L) for columns handling chlorinated solvents and low-temperature cryogenic chemicals. Balanced-bellows design where column overhead pressure relief header has significant back-pressure.
Inlet DN25–DN100, Class 150–300, SS 316L, balanced-bellows, API 526, ASME VIII
Chlorine and Hydrochloric Acid Service
Safety relief valves for chlorine storage vessels, HCl absorption towers, and chlor-alkali plant vessels. Hastelloy C-276 or Monel 400 nozzle, disc, and seat ring for wet chlorine. Closed bonnet mandatory — no atmospheric venting of toxic gas from bonnet. PTFE packing and guide bushing for chlorine gas service.
Inlet DN25–DN80, Class 150–300, Hastelloy C-276 / Monel 400 trim, closed bonnet
Corrosive Chemical Tank Farm
PTFE-lined safety valves for storage tank overpressure protection — sulfuric acid, nitric acid, and caustic soda storage bullets. Open-bonnet PTFE-lined conventional SRV for atmospheric storage tanks (low set pressure, large orifice). Balanced-bellows for pressurised corrosive chemical storage where relief header is shared.
Inlet DN40–DN150, ANSI 150, CS body / PTFE-lined wetted parts, API 526, low set pressure
Required Certifications
Recommended Materials
Selection Factors
Technical FAQs
Why use a balanced-bellows safety valve in a chemical plant?
What material should be used for safety valve trim in HCl (hydrochloric acid) service?
Other Chemical Processing Valve Guides
Safety Valves in Other Industries
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Safety Valves for Chemical Processing
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