BOMCO JA-3 Shear Relief Valve

1

Valve Body

AH0000060104

Alloy steel (4130) with heat treatment, anti-corrosion coating

1. Pressure fatigue from repeated over-pressure events; 2. Corrosion from aggressive drilling fluid; 3. Internal wear from piston movement.

1. Inspect internal surfaces quarterly for wear; 2. Use corrosion inhibitors in drilling fluid; 3. Monitor system pressure to minimize over-pressure triggers.

2

Piston Assembly

AH0000060103

Stainless steel (304) piston, nitrile rubber (NBR) seals

1. Seal wear from fluid friction; 2. Scoring from unfiltered debris; 3. Corrosion from saltwater (offshore use).

1. Replace seals every 6 months; 2. Ensure upstream filtration to remove debris; 3. Clean piston surfaces before reassembly.

3

Piston Rod for Relief Valve

AH0000060105

High-strength alloy steel (10.9 grade), precision ground

1. Bending from misalignment; 2. Wear from contact with shear components; 3. Corrosion from environmental exposure.

1. Ensure proper alignment during installation; 2. Inspect for bending after over-pressure activation; 3. Apply anti-corrosion grease regularly.

4

Shear Bar

AH0000060110

Carbon steel (Q235A) with precise shear strength calibration

1. Fatigue from repeated pressure loads; 2. Damage from improper shear pin replacement; 3. Corrosion leading to brittle failure.

1. Replace after each over-pressure activation; 2. Use only BOMCO genuine shear pins for compatibility; 3. Store in dry environments to prevent rust.

5

Shear Pin

AH0000060111

Carbon steel (Q195) with calibrated shear strength (API 7K compliant)

1. Premature shear from over-tightening; 2. Corrosion-induced brittle failure; 3. Material degradation from age.

1. Torque to specified limits (not over-tighten); 2. Replace annually even if unused; 3. Avoid mixing with non-calibrated pins.

6

Shear Bar Pin

AH0000060113

Stainless steel (304) for corrosion resistance

1. Wear from shear bar movement; 2. Corrosion; 3. Loosening from system vibration.

1. Inspect for wear after each over-pressure event; 2. Re-tighten after 100 operating hours; 3. Replace if corrosion is visible.

7

Cover Spring

AH0000060108

Spring steel (65Mn) with heat treatment, zinc plating

1. Fatigue from repeated compression/expansion; 2. Plating wear leading to rust; 3. Deformation from improper installation.

1. Inspect for deformation quarterly; 2. Replace every 12 months; 3. Ensure proper seating during reassembly to avoid stress.

1

Safety Cover

AH0000060109

Carbon steel (Q235A) with powder coating

1. Impact damage from on-site tools/debris; 2. Coating wear leading to rust; 3. Loosening from system vibration.

1. Inspect for cracks monthly; 2. Touch up powder coating if damaged; 3. Tighten mounting fasteners regularly.

2

Bumper

AH0000060106

Rubber (NR) with shock-absorbing properties

1. Aging from UV exposure; 2. Hardening from extreme temperatures; 3. Damage from piston rod impact.

1. Replace annually; 2. Protect from direct sunlight; 3. Inspect for hardening or cracks quarterly.

3

Warning Plate

AH0000060112B1

Aluminum alloy with printed safety markings

1. Fading of markings from weathering; 2. Corrosion (offshore use); 3. Impact damage.

1. Replace if markings are unreadable; 2. Apply anti-corrosion spray offshore; 3. Mount in a protected, visible location.

4

Name Plate

AH0000060115B1

Stainless steel (304) with etched markings

1. Corrosion from environmental exposure; 2. Fading of etched markings; 3. Impact damage.

1. Clean regularly to remove debris; 2. Inspect for corrosion quarterly; 3. Avoid impact to prevent bending.

1

Flange Connector

AH0000060401

Carbon steel (Q355B) with flange face machining

1. Flange face wear from repeated assembly; 2. Corrosion; 3. Misalignment leading to uneven gasket pressure.

1. Clean flange face before assembly; 2. Tighten fasteners symmetrically; 3. Use compatible gaskets for sealing.

2

Sealing Connector

AH100102120102

Brass (H62) with rubber seal

1. Seal wear from fluid pressure; 2. Thread wear from repeated assembly; 3. Corrosion from fluid contact.

1. Replace seal annually; 2. Apply thread sealant during installation; 3. Avoid over-tightening to prevent thread damage.

3

Hose M14×1.5(C-type Connector)

520901050030080084

NBR rubber hose, stainless steel (304) C-type connector

1. Rubber aging from high temperature; 2. Connector corrosion; 3. Kinking leading to internal damage.

1. Replace every 12 months; 2. Avoid bending beyond minimum radius; 3. Secure with clamps to prevent kinking.

4

Connector

AH100101210703

Brass (H62) with zinc plating

1. Plating wear leading to corrosion; 2. Thread damage from improper installation; 3. Loosening from vibration.

1. Apply anti-corrosion grease; 2. Use torque wrench for installation; 3. Re-tighten after 150 operating hours.

5

Gasket

AH100101210704

NBR rubber, GB3452.1-82 compliant

1. Compression fatigue; 2. Chemical degradation from drilling fluid; 3. Damage from debris during assembly.

1. Replace after each disassembly; 2. Use compatible drilling fluid; 3. Clean sealing surfaces before installation.

6

Plug

AH100101210705

Brass (H62) with thread sealing structure

1. Thread wear from repeated removal; 2. Corrosion; 3. Loosening from system vibration.

1. Apply thread sealant during installation; 2. Replace if threads are damaged; 3. Inspect for leaks monthly.

7

Nut G5/8″

AH100102120101

Brass (H62) with G-thread standard

1. Thread wear from repeated assembly; 2. Corrosion; 3. Stripping from over-tightening.

1. Torque to recommended limits; 2. Clean threads after each use; 3. Replace if thread stripping is detected.

1

Plain Washer

AH0000060102

Carbon steel (Q235A) with zinc plating

1. Plating wear leading to rust; 2. Deformation from over-tightening; 3. Wear from component movement.

1. Replace with fasteners; 2. Avoid over-tightening to prevent deformation; 3. Use anti-corrosion spray in humid environments.

2

Wire Washer

AH0000060114

Spring steel (65Mn) with zinc plating

1. Elasticity loss from repeated compression; 2. Corrosion; 3. Deformation from improper installation.

1. Replace if elasticity is lost; 2. Inspect for rust monthly; 3. Ensure proper seating during assembly.

3

Roll Pin

AH0000060107

Carbon steel (Q235A) with heat treatment

1. Bending from impact; 2. Corrosion; 3. Wear from component movement.

1. Inspect for bending quarterly; 2. Replace if damaged; 3. Apply anti-corrosion grease before installation.

4

Cotter Pin 4×26

420703020504002600

Carbon steel (Q195) with zinc plating, GB standard

1. Bending from vibration; 2. Corrosion leading to breakage; 3. Wear from component movement.

1. Bend ends fully after installation; 2. Replace every 6 months; 3. Inspect for rust monthly.

5

Cotter Pin 2.5×20

420703024002502000

Carbon steel (Q195) with zinc plating, GB standard

1. Same as Cotter Pin 4×26; 2. Premature breakage from over-stressing.

1. Avoid over-bending during installation; 2. Follow same maintenance steps as 4×26 cotter pin; 3. Replace if bent or corroded.

6

Nut M4(GB41-86)

420402080040200000

Carbon steel (Q235A) with zinc plating, GB41-86 compliant

1. Vibration-induced loosening; 2. Plating wear leading to rust; 3. Thread wear.

1. Use with lock washers; 2. Re-tighten after 100 operating hours; 3. Replace if rust is visible.

7

Screw M4×16

420101021104001600

Carbon steel (Q235A) with zinc plating

1. Thread wear from repeated assembly; 2. Fatigue from vibration; 3. Corrosion.

1. Apply thread locker (e.g., Loctite 243); 2. Torque to 8-10 N·m; 3. Replace after 3 assembly cycles.

8

Blot M10X110

420201070710110010

High-strength alloy steel (10.9 grade)

1. Torsional stress during installation; 2. Fatigue from vibration; 3. Corrosion.

1. Use torque wrench (45-50 N·m); 2. Apply anti-corrosion grease; 3. Inspect for cracks quarterly.

9

Nut M10(GB41-86)

420402080100200000

High-strength alloy steel (10.9 grade) with zinc plating, GB41-86 compliant

1. Vibration-induced loosening; 2. Plating wear; 3. Thread wear from frequent disassembly.

1. Use thread locker; 2. Re-tighten after 150 operating hours; 3. Replace if thread damage is found.

10

Screw M3×8(GB67-86)

420101020703000800

Carbon steel (Q235A) with zinc plating, GB67-86 compliant

1. Thread stripping from over-tightening; 2. Corrosion; 3. Fatigue from vibration.

1. Torque to 3-5 N·m; 2. Apply anti-corrosion spray; 3. Replace if threads are stripped.

What equipment is the JA-3 shear relief valve compatible with?

It is primarily designed for BOMCO F-1300/F-1600 mud pumps, but also compatible with other high-pressure drilling fluid systems. It meets API 7K standards for over-pressure protection in oil and gas drilling applications.

How often should the shear pin be replaced?

Replace the shear pin (AH0000060111) after each over-pressure activation, and annually even if unused—material degradation over time reduces shear accuracy. Always use BOMCO genuine pins to ensure compliance with API 7K shear strength requirements.

What maintenance is required for offshore use?

For offshore applications, inspect all components monthly for corrosion, apply anti-corrosion grease to fasteners and connectors, replace rubber seals/gaskets every 6 months, and protect the safety cover from saltwater exposure to maintain API 7K compliance and valve reliability.