NB800M.22.00 Draining Filter Assembly

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NB800M.22.01.00

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316L stainless steel mesh (mesh density 80 mesh), with excellent corrosion resistance and wear resistance, suitable for filtering various industrial fluids (including weak corrosive media) and ensuring long-term filtration stability.

1. Excessive impurity accumulation leads to excessive pressure difference and screen rupture; 2. Corrosion of mesh due to long-term contact with strong corrosive media beyond material tolerance; 3. Mechanical impact during disassembly and assembly causes mesh deformation.

1. Regularly clean the screen (every 15-30 working days) according to fluid impurity content; 2. Avoid using in strong corrosive fluid environments; 3. Use special tools for disassembly and assembly, and avoid direct impact on the mesh surface.

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NB800M.22.02

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Carbon steel (Q355B) with integral forging forming, surface epoxy resin coating, high pressure-bearing capacity (up to 1.6MPa) and good anti-corrosion performance, suitable for industrial harsh working environments.

1. Excessive fluid pressure exceeds the shell’s bearing limit, leading to cracking; 2. Surface coating peeling due to external impact, resulting in base metal rust and structural weakening; 3. Long-term thermal expansion and contraction causing material fatigue deformation.

1. Monitor fluid pressure regularly to ensure it is within the shell’s rated pressure range; 2. Avoid external collision and impact, and touch up the coating in time if peeling occurs; 3. Check for deformation regularly in high-temperature working environments.

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GB/T3452.1-2005, 165×7-G-S

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Nitrile rubber (NBR 70), good oil resistance and wear resistance, suitable for temperature range -30℃~100℃, compliant with GB/T3452.1-2005 hydraulic and pneumatic O-ring standard, ensuring reliable sealing performance.

1. Aging and hardening caused by long-term high-temperature environment or contact with incompatible oil products; 2. Cutting damage caused by burrs on the matching surface during installation; 3. Compression deformation due to excessive installation pressure.

1. Replace regularly (every 6-12 months) or immediately if aging, cracking is found; 2. Remove burrs on the matching surface before installation, and apply a small amount of lubricating oil; 3. Control installation compression ratio within 15%-25%.

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NB800M.22.03, 1 1/2-8UN（12UNF）-2A×128

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High-strength alloy steel (40Cr), quenched and tempered treatment, tensile strength ≥800MPa, thread precision grade 2A, good fatigue resistance and load-bearing capacity, suitable for industrial heavy-duty fastening scenarios.

1. Bolt breakage due to uneven torque during installation; 2. Thread wear or seizure caused by long-term exposure to humid environment and rust; 3. Fatigue damage caused by frequent equipment vibration.

1. Use a torque wrench to apply uniform torque (55-65N·m) during installation; 2. Apply anti-rust and anti-seize agent to the thread, and check regularly for rust; 3. Install shock-absorbing components to reduce equipment vibration impact.

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NB800M.22.04, 1 1/2-8UN-2B（SPL）

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Alloy steel (35CrMo), heat treatment to enhance hardness and wear resistance, thread precision grade 2B, matching with the double ends bolt of the same specification, ensuring tight fit and no loosening.

1. Thread sliding caused by over-tightening during installation; 2. Wear and deformation of the nut hexagon due to improper use of wrenches; 3. Rust caused by humid environment, affecting disassembly and assembly.

1. Avoid over-tightening, and control torque consistent with the matching bolt; 2. Use a wrench of matching size, avoiding forced disassembly and assembly; 3. Regularly clean and maintain, and apply anti-rust agent in humid environments.

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Can the O-ring be replaced with non-GB/T3452.1-2005 standard products?

No. Non-standard O-rings may have inconsistent size and material performance, leading to poor sealing and fluid leakage. Only GB/T3452.1-2005 compliant products matching 165×7-G-S specification can ensure compatibility and sealing reliability with the filter.

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How to judge whether the double ends bolt needs to be replaced?

Check the bolt for thread wear, rust, or bending; if the bolt is loose after tightening or has obvious fatigue marks, it needs to be replaced immediately. It is recommended to replace the bolts in batches every 12 months to avoid mixed use of old and new bolts leading to uneven stress.

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What is the service life of the filter screen assembly under normal working conditions?

Under normal fluid impurity content (≤50mg/L) and regular cleaning (every 15-30 days), the service life is 6-12 months. If the fluid has high impurity content, shorten the cleaning cycle and check the screen for damage regularly to avoid premature rupture.