HHF-1300/1600 JA—3 Relief Valve Parts

1

11-3161-2803-00

Piston assembly

Stainless Steel (316) + FKM Seal

1. Wear from friction during repeated actuation; 2. Corrosion from contaminated media; 3. Seal degradation from high-temperature exposure.

1. Lubricate with compatible grease every 300 operating hours; 2. Filter media to remove particles >0.2mm; 3. Inspect seal integrity quarterly.

2

11-3161-2804

Valve

Stainless Steel (316) with Polished Seating Surface

1. Seat wear from pressure surges; 2. Scratching from debris in media; 3. Fatigue from repeated opening/closing cycles.

1. Calibrate pressure setting annually (per API 520); 2. Flush valve periodically to remove debris; 3. Avoid over-adjusting pressure beyond rated limits.

3

11-3161-2805

Piston rod

Alloy Steel (17-4 PH) with Hard Chrome Plating

1. Chrome plating wear from friction; 2. Bending from misaligned actuation; 3. Corrosion from humid industrial environments.

1. Ensure alignment with piston assembly during installation; 2. Inspect plating for scratches monthly; 3. Store spare rods in dry, dust-free conditions.

4

11-3161-2808

Locking spring

High-Temperature Spring Steel (Inconel X-750)

1. Fatigue from repeated compression/expansion; 2. Corrosion from chemical fumes; 3. Deformation from over-compression.

1. Replace spring every 1,000 operating hours; 2. Avoid exceeding spring compression limits; 3. Inspect for cracks during routine maintenance.

1

11-3161-2801

Joint

Stainless Steel (304)

1. Thread wear from repeated assembly/disassembly; 2. Corrosion from chloride-containing media; 3. Over-tightening causing thread stripping.

1. Tighten to 40-45 N·m (per ASME B18.2.1); 2. Apply anti-seize compound to threads; 3. Avoid use with media containing >50ppm chloride.

1

11-3161-2802

Retainer ring

Carbon Steel (Zinc-Plated)

1. Deformation from improper installation; 2. Corrosion from humid environments; 3. Fatigue from vibration during pressure relief.

1. Install using proper tooling to avoid bending; 2. Inspect for rust monthly; 3. Replace if deformed or cracked.

2

11-3161-2807

Elastic straight pin

Spring Steel (65Mn)

1. Fatigue from repeated flexing; 2. Corrosion leading to brittleness; 3. Shearing from excessive force during assembly.

1. Insert pin gently to avoid over-flexing; 2. Replace after each disassembly; 3. Store in anti-corrosion packaging.

3

11-3161-2813

Pin

Carbon Steel (Zinc-Plated)

1. Wear from friction with mating parts; 2. Corrosion from industrial fumes; 3. Bending from misaligned forces.

1. Ensure proper fit with mating components; 2. Lubricate lightly before installation; 3. Inspect for wear during routine maintenance.

4

11-3161-2814

Retainer ring, steel wire

Stainless Steel (304) Wire

1. Fatigue from repeated expansion; 2. Corrosion from media leakage; 3. Snapping from over-installation force.

1. Use dedicated pliers for installation/removal; 2. Inspect for kinks before installation; 3. Replace if wire diameter is reduced by wear.

5

11-3161-2816

Pin, 4*26

Carbon Steel (Zinc-Plated)

1. Wear from vibration; 2. Corrosion from humid conditions; 3. Shearing from excessive load.

1. Secure firmly to prevent movement; 2. Inspect monthly for loosening; 3. Replace if signs of shearing are visible.

1

11-3161-2809

Safety guard

Mild Steel (Galvanized)

1. External impact during maintenance; 2. Corrosion from industrial environments; 3. Loosening from vibration.

1. Secure tightly after maintenance; 2. Clean regularly to remove debris; 3. Replace if bent or rusted to maintain protection.

2

11-3161-2810

Plate, shear pin

Carbon Steel (Stamped)

1. Corrosion from media leaks; 2. Bending from external force; 3. Wear from vibration.

1. Inspect for alignment with shear pin; 2. Replace if bent or corroded; 3. Ensure secure attachment to prevent detachment.

3

11-3161-2811

Shear pin

Mild Steel (Low Carbon)

1. Shearing from excessive pressure; 2. Corrosion leading to brittle failure; 3. Fatigue from repeated stress cycles.

1. Replace immediately after shearing (critical for safety); 2. Use only genuine parts to ensure correct shear strength; 3. Inspect before each system startup.

4

11-3161-2812

Warning plate

Aluminum (Anodized) with UV-Resistant Printing

1. Fading from UV exposure; 2. Scratching from debris; 3. Adhesive failure from high temperatures.

1. Mount in a shaded area if possible; 2. Clean gently with non-abrasive cloth; 3. Replace if printing is unreadable (OSHA compliance).

5

11-3161-2815

Nameplate

Stainless Steel (304) with Engraved Text

1. Corrosion from harsh environments; 2. Scratching from tools during maintenance; 3. Fading of engraved text.

1. Apply protective wax annually; 2. Avoid contact with abrasive tools; 3. Document nameplate details for maintenance records.

1

11-3161-2817

Screw, 8（0.164）-32UNC-2A*16

Carbon Steel (8.8 Grade, Zinc-Plated)

1. Thread wear from repeated assembly; 2. Corrosion from humid conditions; 3. Over-tightening causing stripping.

1. Tighten to 12-15 N·m (per ASME B18.2.2); 2. Apply thread locker for vibration-prone areas; 3. Replace if threads are damaged.

2

11-3161-2818

Nut, 8（0.164）-32UNC-2B

Carbon Steel (8.8 Grade, Zinc-Plated)

1. Thread seizing from corrosion; 2. Fatigue from vibration; 3. Mismatched torque with screws.

1. Torque in tandem with matching screws; 2. Replace if threads are stripped; 3. Store in dry, corrosion-free conditions.

3

11-3161-2819

Bolt, 3/8-16UNC-2A*105

Alloy Steel (10.9 Grade)

1. Fatigue from pressure-induced vibration; 2. Thread wear from assembly; 3. Corrosion from industrial fluids.

1. Tighten to 55-60 N·m (per ASME B18.2.1); 2. Apply anti-seize compound; 3. Inspect quarterly for loosening.

4

11-3161-2820

Nut, 3/8-16UNC-2B（SPL）

Alloy Steel (10.9 Grade)

1. Thread seizing from corrosion; 2. Fatigue from repeated torque cycles; 3. Damage from improper tooling.

1. Use calibrated torque wrench for installation; 2. Replace if threads are damaged; 3. Avoid reusing if over-tightened.

5

11-3161-2821

Screw, 5（0.125）-40UNC-2A*8

Carbon Steel (8.8 Grade, Zinc-Plated)

1. Thread wear from frequent maintenance; 2. Corrosion from humid environments; 3. Over-tightening causing breakage.

1. Tighten to 8-10 N·m; 2. Replace after 3-4 assembly cycles; 3. Use small-diameter torque wrench to avoid over-tightening.

1

11-3161-2806

Cushion

Polyurethane (PU) Foam

1. Compression fatigue from repeated shock absorption; 2. Degradation from high temperatures; 3. Chemical attack from hydraulic fluid additives.

1. Replace every 800 operating hours; 2. Ensure compatibility with hydraulic fluid; 3. Inspect for compression set monthly.

How often should the shear pin be inspected and replaced?

Inspect the shear pin (11-3161-2811) before each system startup. Replace immediately if sheared—genuine parts ensure correct shear strength (critical for safety). For high-cycle systems, replace proactively every 500 operating hours.

What is the recommended calibration schedule for the relief valve?

Calibrate the valve annually per API 520 standards to ensure accurate pressure relief settings. For systems with frequent pressure fluctuations or harsh media, shorten calibration intervals to 6 months. Always document calibration results for compliance.

Can I use alternative materials for the piston assembly in corrosive media?

Yes. For highly corrosive media (e.g., strong acids/alkalis), replace the standard 316 stainless steel piston assembly (11-3161-2803-00) with a Hastelloy C-276 version, paired with Viton seals, to enhance chemical resistance and extend service life.