NB800M.28.00 JA-3 Shear Pin Safety Valve

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NB800M.28.01

304 stainless steel, precision thread machining, surface anti-seize treatment, good corrosion resistance and high-pressure bearing capacity (up to 25MPa), compatible with NB800M series pipeline interfaces.

1. Thread wear or seizure from improper disassembly/assembly; 2. Corrosion from long-term contact with corrosive fluid; 3. Fatigue damage from pipeline vibration.

1. Apply anti-seize agent to threads before installation; 2. Use a torque wrench (30-40N·m) to avoid over-tightening; 3. Install shock absorbers near the connector to reduce vibration.

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NB800M.28.02

65Mn spring steel, heat-treated for enhanced hardness (HRC 35-40), good elasticity and wear resistance, tailored for the safety valve’s internal positioning requirements.

1. Deformation from excessive internal pressure; 2. Wear from long-term friction with adjacent components; 3. Fatigue failure from repeated valve actuation.

1. Inspect for deformation every time the valve is disassembled; 2. Ensure proper installation to avoid uneven stress; 3. Replace if wear or fatigue cracks are found.

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NB800M.28.03.00

Piston body: 316L stainless steel; Seal: NBR rubber; Guide sleeve: brass, precision machining, excellent corrosion resistance and sealing performance, suitable for high-pressure fluid pressure transmission.

1. Seal wear leading to pressure leakage and delayed actuation; 2. Guide sleeve wear causing piston jamming; 3. Corrosion of the piston body from harsh media.

1. Replace seals every 6-12 months; 2. Clean the piston cavity regularly to remove impurities; 3. Ensure compatibility with fluid media to prevent corrosion.

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NB800M.28.04

Q355B carbon steel, integral forging forming, surface epoxy anti-corrosion coating, high structural strength, pressure-bearing capacity up to 30MPa, suitable for high-pressure safety valve applications.

1. Cracking from excessive fluid pressure exceeding rated limits; 2. Corrosion from external environment or internal fluid leakage; 3. Deformation from external impact.

1. Monitor system pressure to stay within rated range; 2. Touch up anti-corrosion coating if damaged; 3. Install protective barriers to avoid external impact.

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NB800M.28.05

40Cr alloy steel, quenched and tempered, surface chrome plating for wear resistance, tensile strength ≥800MPa, good toughness and pressure-bearing capacity.

1. Bending or deformation from uneven pressure; 2. Chrome plating wear leading to corrosion; 3. Fatigue fracture from repeated pressure cycles.

1. Ensure proper alignment during installation; 2. Inspect the chrome plating for scratches and touch up if needed; 3. Replace if bending or fatigue cracks are found.

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NB800M.28.06

Polyurethane (PU) foam, high elasticity and impact resistance, temperature resistance (-20℃~100℃), good wear resistance, tailored for safety valve shock absorption.

1. Compression fatigue leading to loss of shock-absorbing performance; 2. Aging and brittleness from long-term use; 3. Damage from contact with sharp internal components.

1. Inspect for compression deformation every 6 months; 2. Replace if aging or cracking is found; 3. Ensure no sharp edges are present on adjacent components.

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NB800M.28.07

65Mn spring steel, heat-treated for elasticity, surface galvanized for anti-rust, good flexibility and wear resistance, suitable for flexible positioning of internal components.

1. Fatigue fracture from repeated vibration; 2. Rust from humid environments leading to loss of elasticity; 3. Deformation from improper installation force.

1. Avoid excessive force during installation; 2. Regularly inspect for rust and replace if needed; 3. Replace after the valve triggers once to prevent hidden fatigue damage.

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NB800M.28.08

50CrVA spring steel, precision coiling, heat-treated for fatigue resistance, good elasticity and reset performance, suitable for safety valve locking and reset.

1. Fatigue failure from repeated compression and reset; 2. Deformation from excessive pressure; 3. Rust from internal moisture accumulation.

1. Replace the spring after the valve triggers 3 times; 2. Inspect for deformation and rust regularly; 3. Ensure the valve cavity is dry during maintenance.

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NB800M.28.09

Q235B carbon steel, stamping forming, surface powder coating for anti-corrosion, lightweight and strong, suitable for external protection of safety valves.

1. Deformation or cracking from external impact; 2. Coating peeling leading to rust; 3. Clogging from dust accumulation affecting valve ventilation.

1. Avoid collision with the shield during operation; 2. Touch up the coating if peeled; 3. Clean dust regularly to ensure ventilation.

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NB800M.28.10

45# carbon steel, quenched and tempered, precision machining, high structural strength and pressure-bearing capacity, tailored for shear pin fixing and pressure transmission.

1. Deformation from excessive pressure; 2. Wear from long-term contact with the shear pin; 3. Fatigue damage from repeated pressure cycles.

1. Inspect for deformation after each valve actuation; 2. Replace if wear on the shear pin hole is found; 3. Ensure the shear pin is installed correctly to avoid uneven stress.

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NB800M.28.11

20# carbon steel, precision machining, fixed shear strength, designed to break at the set pressure (matched with JA-3 safety valve), ensuring reliable overpressure triggering.

1. Premature breakage from improper installation or foreign objects; 2. Rust from humid environments affecting shear strength; 3. Fatigue damage from long-term pressure loading.

1. Replace with the original model only; 2. Ensure the installation surface is clean and free of foreign objects; 3. Replace immediately after breaking, do not reuse.

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NB800M.28.12

Aluminum alloy, surface anodizing, laser engraving for wear resistance, clear printing, suitable for industrial on-site information display.

1. Fading or wear of engraved content from long-term exposure; 2. Damage from external impact; 3. Corrosion from chemical splashes.

1. Avoid direct chemical splashes; 2. Clean with a soft cloth to prevent scratching; 3. Replace if the content becomes unclear.

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NB800M.28.13

40Cr alloy steel, quenched and tempered, surface chrome plating for wear resistance, good toughness and rotational performance, suitable for connecting movable valve parts.

1. Wear from long-term rotation leading to increased clearance; 2. Rust from humid environments causing jamming; 3. Bending from uneven force.

1. Apply lubricating oil regularly to reduce wear; 2. Inspect for rust and clean if needed; 3. Ensure proper alignment to avoid uneven stress during movement.

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NB800M.28.14

Stainless steel wire, heat-treated for elasticity, surface polishing, good corrosion resistance and flexibility, suitable for fixing small internal components in confined spaces.

1. Elastic fatigue leading to loss of fixing force; 2. Breakage from improper installation force; 3. Rust from internal moisture accumulation.

1. Use special tools for installation to avoid excessive force; 2. Replace after disassembly to prevent hidden fatigue; 3. Ensure the valve cavity is dry during maintenance.

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NB800M.28.15

Stainless steel, surface etching, anti-fading treatment, durable and corrosion-resistant, suitable for long-term identification of industrial equipment components.

1. Fading of etched content from long-term exposure; 2. Damage from external impact; 3. Corrosion from harsh industrial environments.

1. Avoid collision with the name plate; 2. Clean regularly to remove dust and dirt; 3. Replace if the identification content becomes unclear.

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GB/T91-2000, 4×25

Q235 carbon steel, surface galvanized for anti-rust, precision machining, compliant with GB/T91-2000 standards, suitable for auxiliary component positioning.

1. Bending from improper installation force; 2. Rust from humid environments leading to jamming; 3. Wear from long-term contact with adjacent parts.

1. Use appropriate force during installation; 2. Replace if rust or bending is found; 3. Ensure proper alignment with the installation hole.

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ANSI/ASME B18.6.3-2003, 8（0.164）-32×5/8

Stainless steel 304, precision thread machining, compliant with ANSI/ASME standards, good corrosion resistance, suitable for small-load fastening of lightweight components.

1. Thread stripping from over-tightening; 2. Corrosion from harsh environments; 3. Loss from loose fastening due to vibration.

1. Tighten to standard torque (15-20N·m); 2. Inspect for corrosion regularly; 3. Re-tighten periodically if vibration is present.

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ANSI/ASME B18.6.3-2003, 8（0.164）-32

Stainless steel 304, thread precision matching the corresponding bolt, compliant with ANSI/ASME standards, good corrosion resistance and wear resistance.

1. Thread wear from repeated disassembly; 2. Corrosion from humid environments leading to seizure; 3. Stripping from over-tightening.

1. Avoid excessive disassembly; 2. Clean threads regularly to prevent corrosion; 3. Tighten to the same torque as the matching bolt.

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ANSI/ASME B18.2.1-1996, 3/8-16×4 3/8

A325 high-strength carbon steel, heat-treated, tensile strength ≥830MPa, compliant with ANSI/ASME standards, suitable for medium-load fastening of key components.

1. Breakage from over-tightening or excessive load; 2. Rust from humid environments; 3. Fatigue damage from long-term vibration.

1. Use a torque wrench (45-55N·m); 2. Apply anti-rust agent to threads; 3. Inspect for fatigue cracks regularly.

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ANSI/ASME B18.2.2-1987(R1999), 3/8-16

Carbon steel with zinc plating, thread precision matching the 3/8-16 bolt, compliant with ANSI/ASME standards, good anti-rust performance and load-bearing capacity.

1. Thread stripping from over-tightening; 2. Zinc coating peeling leading to rust; 3. Wear from repeated disassembly.

1. Tighten to match the bolt’s torque; 2. Protect from scratches to maintain the zinc coating; 3. Replace if rust or thread damage is found.

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ANSI/ASME B18.6.3-2003, 5（0.125）-40×5/16

Stainless steel 304, precision thread machining, compliant with ANSI/ASME standards, small size and light weight, suitable for micro-load fastening of internal parts.

1. Thread stripping from over-tightening; 2. Loss from loose fastening due to vibration; 3. Corrosion from internal moisture.

1. Use a small torque wrench (10-15N·m); 2. Re-tighten periodically if vibration is present; 3. Ensure the installation hole is clean and dry.

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Can I reuse the shear pin (NB800M.28.11) after it breaks?

No. The shear pin is designed for one-time use; it loses its precise shear strength after breaking, even if repaired. Reusing it will cause delayed or accidental triggering, risking equipment damage—always replace it with the original model.

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Why must ANSI/ASME standard bolts be used instead of non-standard ones?

ANSI/ASME bolts (e.g., 3/8-16×4 3/8) are engineered for specific load-bearing and thread precision, matching the safety valve’s pressure requirements. Non-standard bolts may cause loose connections, thread stripping, or failure under high pressure, compromising safety.

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How often should the JA-3 safety valve components be inspected?

Conduct routine inspections every 3 months (focus on seals, shear pin rust, and spring elasticity) and comprehensive maintenance every 12 months (replace seals, shear pin, and fatigue-prone components like the lock spring) to ensure reliable overpressure protection.