NB800M.24.00 Elbow Assembly

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NB800M.24.01.00

Stainless steel (304), precision machining, surface polishing treatment, good corrosion resistance and structural stability, suitable for medium and low pressure working environments (0-1.6MPa) and compatible with industrial standard pressure gauges.

1. Wear of the sealing surface due to frequent disassembly and assembly of the pressure gauge; 2. Corrosion caused by long-term contact with corrosive media, leading to sealing failure; 3. Deformation due to improper installation force, affecting pressure transmission.

1. Minimize unnecessary disassembly and assembly of the pressure gauge; 2. Regularly inspect the sealing surface for corrosion or scratches, and replace if damaged; 3. Use a torque wrench for installation, controlling torque within 25-35N·m.

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NB800M.24.02.00

High-strength stainless steel (316L), precision grinding of the sealing surface, high pressure-bearing capacity and excellent corrosion resistance, suitable for harsh industrial media and overpressure protection scenarios (-20℃~150℃).

1. Wear of the sealing surface due to frequent overpressure triggering of the safety valve; 2. Impurity accumulation on the sealing surface, leading to leakage; 3. Material fatigue caused by long-term alternating pressure, reducing structural strength.

1. Regularly calibrate the safety valve and clean the sealing surface; 2. Avoid frequent overpressure operation of the equipment to reduce seat wear; 3. Inspect for material fatigue annually and replace if necessary.

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NB800M.24.03.00

Carbon steel (Q355B), integral forging forming, surface anti-corrosion treatment (epoxy coating), high structural strength and impact resistance, suitable for high-flow fluid discharge and compatible with NB800M elbow assembly pipelines.

1. Blockage caused by excessive impurity accumulation in the fluid, leading to excessive pressure and structural deformation; 2. Corrosion of the inner wall due to long-term contact with high-sulfur or high-water-content fluid; 3. External impact causing pipe wall cracking.

1. Regularly clean the inner cavity to remove impurity accumulation; 2. Avoid using in high-corrosion fluid environments, or enhance anti-corrosion protection; 3. Install protective sleeves to prevent external impact.

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NB800M.24.04, 1 1/16-8UN-2A×180

Alloy steel (40CrNiMoA), quenched and tempered treatment, tensile strength ≥900MPa, thread precision grade 2A, excellent fatigue resistance and load-bearing capacity, suitable for high-pressure and high-vibration working conditions.

1. Bolt breakage due to uneven torque during installation; 2. Thread seizure caused by rust in humid environments; 3. Fatigue damage caused by long-term equipment vibration and alternating load.

1. Use a torque wrench to apply uniform torque (60-70N·m); 2. Apply anti-rust and anti-seize agent to the thread; 3. Regularly inspect for vibration-induced loosening and re-tighten as needed.

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NB800M.24.05, 1 1/16-8UN-2B（SPL）

Alloy steel (35CrMo), heat treatment to enhance hardness (HRC 28-32), thickened structure design, thread precision grade 2B, perfect matching with the corresponding double ends bolt, strong load-bearing capacity.

1. Thread sliding caused by over-tightening during installation; 2. Hexagon deformation due to using mismatched wrenches; 3. Rust caused by humid or corrosive environments, affecting disassembly and assembly.

1. Control installation torque consistent with the matching bolt; 2. Use a wrench of the correct size, avoiding forced operation; 3. Clean and apply anti-rust agent regularly in harsh environments.

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NB800M.24.06, R27

Flexible graphite composite material, high temperature resistance (-200℃~450℃), good sealing performance and compression resilience, suitable for high-pressure and high-temperature fluid pipeline sealing.

1. Aging and brittleness caused by long-term high-temperature operation; 2. Damage caused by burrs on the matching surface during installation; 3. Over-compression leading to loss of resilience and sealing failure.

1. Replace regularly (every 6-12 months) or immediately if aging is found; 2. Remove burrs on the matching surface before installation; 3. Control compression ratio within 20%-30%.

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243 Anaerobic Adhesive (Thread Locking and Sealing)

Anaerobic resin-based material, medium strength, removable, temperature resistance -55℃~150℃, good oil resistance and corrosion resistance, suitable for metal thread locking and sealing.

1. Poor adhesion due to oil stains or impurities on the thread surface; 2. Failure to cure completely due to insufficient anaerobic environment; 3. Aging and loss of performance in high-temperature environments.

1. Clean the thread surface to remove oil and impurities before application; 2. Ensure the thread is fully engaged to form an anaerobic environment for curing; 3. Avoid using in high-temperature areas exceeding 150℃.

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Can other models of anaerobic adhesive replace 243 for thread sealing?

It is not recommended. 243 anaerobic adhesive’s medium strength and temperature resistance are tailored for NB800M elbow assembly bolts. Using other models may cause over-strong adhesion (hard to disassemble) or insufficient strength (easy loosening), affecting component maintenance and stability.

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How often should the R27 gasket ring be replaced?

Under normal working conditions (temperature ≤300℃, pressure ≤1.6MPa), replace every 6-12 months. If the equipment operates in high-temperature, high-pressure, or corrosive environments, shorten the replacement cycle to 3-6 months and check for damage regularly.

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Why must the double ends bolt and thickened nut be used in matching pairs?

The two components are designed with matching thread precision (2A/2B) and material strength, ensuring tight fit and uniform stress. Mixing with other specifications will cause thread mismatch, loose fastening, or uneven stress, leading to bolt breakage or component leakage.