High-Performance Hastelloy C276 Needle Valves for Instrumentation

Universal Corrosion Resistance: Resists both reducing and oxidizing acids, wet chlorine, chlorides, hypochlorite, and mixed acids – the most versatile corrosion-resistant alloy for needle valve applications.

Highest Pitting Resistance (PRE ≥ 65): Outstanding pitting and crevice corrosion resistance, the highest among all commercial needle valve materials, with PREN ≥ 65.

No Sensitization: Extremely low carbon content (≤0.010%) – can be used as-welded without PWHT.

Excellent Wet Chlorine Resistance: Premier material for wet chlorine sampling and injection needle valves.

Superior Hydrochloric Acid Resistance: Excellent in HCl across all concentrations up to 400°C (752°F).

NACE MR0175 / ISO 15156 Compliant: Fully qualified for sour service with highest allowable H₂S partial pressures.

Precise Flow Control: Fine-thread stem provides accurate flow regulation for instrumentation and sampling applications.

Fine Metering Capability: V-point or blunt-point stem tip design for precise flow adjustment.

Multiple Connections: Female NPT, male NPT, tube socket weld, VCR, Swagelok-type compression.

Full Range of Types: Integral bonnet, union bonnet, bar stock, flanged, panel mount, and cryogenic needle valves.

Pressure Ratings: Available to 10,000 psi to 30,000 psi dependiendo on design, plus 6000 psig, 10000 psig, 15000 psig.

Temperature Range: Suitable for -196°C to 400°C (-321°F to 752°F).

International Certifications: Valves can be certified by ABS, BV, DNV, LR, and comply with NACE MR0175, ISO 15848 (low emission), TA Luft.

Raw Material Selection: High-quality Hastelloy C276 bar stock from certified mills (Haynes International, VDM Metals, Special Metals) with certified chemical composition and traceability.

Cutting: Bar stock cut to length.

Machining: CNC lathe machining of body bore, thread ports, stem bore, packing cavity, and bonnet threads.

Stem Machining: Precision stem with fine threads and needle tip machined to exact specification.

Packing Installation: PTFE/Grafoil packing rings installed in packing cavity.

Assembly: Stem, packing nut, gland follower, and handle assembled.

Testing: Hydrostatic shell test, seat test (bubble-tight), packing leak test.

Marking: Laser engraved with size, pressure, material, heat number, and NACE MR0175.

Pressure Testing: Shell test (1.5× rated pressure), seat test (1.1× rated pressure, zero leakage), packing test.

Material Verification: PMI 100% for body and stem – verification of Ni, Cr, Mo, W.

Intergranular Corrosion Test: ASTM G28 – mandatory.

Dimensional Inspection: Thread dimensions, stem tip contour, orifice size.

Low Emission Test: ISO 15848 upon request.

Third-Party Inspection: SGS, BV, DNV, TUV on customer request.

Hydrochloric Acid Injection: Precise HCl flow control for chemical injection skids.

Wet Chlorine Sampling: Sampling valves for chlorine drying systems, bleaching systems.

Pharmaceutical API Reactors: High-purity sampling and injection, sterile chemical lines.

Flue Gas Desulfurization (FGD): Sampling lines for FGD process analysis.

Sour Gas Wellhead Instrumentation: Instrument isolation for H₂S containing gas wells (NACE MR0175).

Chemical Analyzer Systems: Sample conditioning, analyzer isolation.

High Pressure Gas Analysis: Gas chromatography sampling, process gas analysis.

Lab Testing Systems: Pilot plants, test facilities, R&D instrumentation.

1. What is the difference between integral bonnet and union bonnet needle valves?
Integral bonnet has bonnet threaded directly into body – compact, lower cost, but bonnet removal more difficult. Union bonnet has union nut connection – easier for stem packing replacement and maintenance.

2. What are the advantages of Hastelloy C276 for needle valves?
Highest corrosion resistance (PRE ≥65), excellent for HCl, wet chlorine, and mixed acids. Ideal for aggressive chemical injection and sampling applications.

3. What is the typical Cv range for needle valves?
Cv ranges from 0.004 for micro-flow to 1.0 for 1″ needle valves. Hastelloy C276 needle valves are typically used for Cv values up to 0.5.

4. Are Hastelloy C276 needle valves suitable for hydrogen service?
Yes, with proper material verification to prevent hydrogen embrittlement. Hastelloy C276 has good hydrogen compatibility.

Highest Corrosion Resistance: PRE ≥65 – unmatched in needle valve industry.

NACE MR0175 Compliant: Full sour service documentation.

Precision Machining: CNC machined for accurate flow control.

Low Emission Options: ISO 15848 packing available.

100% PMI Tested: Material verification on every valve.

Full Traceability: Heat number on body – traceable to mill.

Tel / WhatsApp:
Victor: +86 15575100681
Jack: +86 18390957568

E-mail: info@womicstainless.com

Website: www.womicsteel.com

Contact Womic Steel today for a competitive quote on Hastelloy C276 needle valves. We offer certified quality, NACE MR0175 compliance, ASTM G28 corrosion testing, precision flow control, and reliable global delivery.

tock Examples (Threaded Hastelloy C276 Needle Valves – Integral Bonnet – 6000 psig – V-Point):

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