Chemical Processing×Globe Valves

Globe Valves for Chemical Processing

Globe valves are the standard for flow regulation, throttling, and start/stop control in chemical plants — from steam and condensate to corrosive acids and reactive chemicals. Vajra Industrial Solutions supplies stainless steel, Hastelloy, and exotic alloy globe valves for chemical process service, including bellows-seal designs for zero fugitive emissions and PTFE-lined variants for aggressive acid service.

Key Applications — Globe Valves in Chemical Processing

Steam and Condensate Regulation

Carbon steel (WCB) and alloy steel (WC6) globe valves for steam pressure regulation, steam tracing control, and condensate dump service. Rising-stem handwheel allows precise flow setting. Available with integral bypass for pressure-equalising before main valve opening.

DN15–DN200, Class 150–900, WCB / WC6, ASME B16.34, BS 1873

Corrosive Chemical Isolation and Control

Stainless steel 316L globe valves for dilute acids, alkalis, and solvents. Hastelloy C-276 or Alloy 20 for concentrated sulfuric acid, hydrochloric acid, and chlorinated solvents. PTFE-lined globe valves for strongly oxidising acids (nitric, chromic acid). Full material traceability with PMI (Positive Material Identification).

DN15–DN200, Class 150–600, SS 316L / Hastelloy C-276 / Alloy 20, ASME B16.34

Bellows-Seal Globe Valves — Fugitive Emission Control

Bellows-seal globe valves replace the conventional stem packing with a metallic bellows, eliminating atmospheric emissions at the stem. Required for handling toxic, carcinogenic, or environmentally regulated chemicals (benzene, toluene, chlorinated solvents) under EU LDAR (Leak Detection and Repair) or EPA Method 21 regulations.

DN15–DN150, Class 150–600, SS 316L / WCB, EN ISO 15848-1 Class A, BS 6364

Pump Minimum Flow Bypass

Globe valves sized for continuous minimum flow bypass around centrifugal pumps. Spring-loaded self-regulating versions maintain constant flow independent of pump discharge pressure. Applicable for reactor feed pumps, boiler feed pumps, and any high-pressure pump where minimum flow protection is required.

DN15–DN50, Class 300–600, SS 316 or WCB, calculated Cv for minimum flow rate

Cryogenic Globe Valves

Extended bonnet globe valves for cryogenic chemical service (-196°C liquid nitrogen, -101°C LNG). Extended bonnet prevents the packing from reaching cryogenic temperature, maintaining packing effectiveness. Body in SS 316L or A350 LF2, live-loaded packing standard.

DN15–DN150, Class 150–600, A350 LF2 / SS 316L, -196°C rated, BS 6364

Required Certifications

EN ISO 15848-1 (fugitive emissions — bellows-seal and live-loaded packing)ASME B16.34 — Pressure-Temperature RatingsBS 1873 / API 623 — Globe Valve StandardsAPI 598 — Production Pressure TestingEN 10204 3.1 MTCs with PMIATEX (if in explosion-risk zone — actuated valves)

Recommended Materials

A216 WCB / WCC (carbon steel) — steam, water, general chemicals
A351 CF8M (SS 316 cast) — corrosive liquids and mild acids
A182 F316L (SS 316L forged) — welded connections in corrosive service
Hastelloy C-276 (N10276) — concentrated hydrochloric, sulfuric, mixed acids
Alloy 20 (CN7M) — sulfuric acid service
PTFE-lined (CS body) — strongly oxidising acids (nitric, chromic)
A217 WC6 — high-temperature alloy steel (above 350°C steam)

Selection Factors

Chemical compatibility: Check NACE corrosion charts for material vs. fluid concentration and temperature
Fugitive emissions: Bellows-seal required for toxic/carcinogenic media; live-loaded packing for regulated VOCs
Temperature: WCB to 425°C; WC6 to 600°C; SS 316L to 450°C continuous
Pressure rating: Class 150 for low pressure; Class 300–600 for process; Class 900–2500 for high-pressure steam
End connections: RF flanged (most common); socket weld or butt weld for high-pressure small bore
Seat design: Disc-to-seat for standard; plug disc for throttling; composition disc for tight shut-off

Technical FAQs

When is a bellows-seal globe valve required?
Bellows-seal globe valves are required when handling media classified as toxic, carcinogenic, or environmentally regulated — typically where any stem leakage to atmosphere is unacceptable. Common examples: benzene and aromatic compounds (IARC Group 1 carcinogens), chlorinated solvents (methylene chloride, TCE), ammonia and volatile amines, hydrogen cyanide, and any chemical subject to LDAR regulations under EPA 40 CFR Part 63 or EU Directive 2010/75/EU.
What material is best for sulfuric acid service in a globe valve?
Material selection for sulfuric acid depends on concentration and temperature. Concentrated H₂SO₄ (>96%) at ambient: carbon steel is acceptable (forms protective sulfate layer). Dilute H₂SO₄ (10–80%): Alloy 20 (CN7M) or Hastelloy B-3. Hot concentrated H₂SO₄: PTFE-lined. For all concentrations at elevated temperature, Hastelloy C-276 provides the widest compatibility. Always confirm with a corrosion engineer — sulfuric acid service conditions vary significantly.

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Globe Valves for Chemical Processing

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