Product Introduction
This comprehensive FKQ840-8 BOP control unit spare parts catalog covers all mission-critical hydraulic-pneumatic subsystems: pressure monitoring gauges, directional control valves, pneumatic actuators, accumulator bladders & inflation valves, hydraulic pump components, sealing assemblies, and pneumatic control valves. Each part is cross-referenced with original part numbers, M.E.S.C codes, and exact quantity specifications, manufactured from corrosion-resistant alloy steel, high-strength nitrile rubber, and explosion-proof materials to match original equipment pressure ratings and safety performance. Every component undergoes 100% pressure testing (0-40MPa for hydraulic parts, 0-2.5MPa for pneumatic parts) and leak testing to guarantee reliability in extreme oilfield conditions.
Key Functional Specifications
- Pressure Monitoring Accuracy: Y-100-III pressure gauges deliver ±1.6% full-scale accuracy across 0-2.5MPa, 0-25MPa, and 0-40MPa ranges, with real-time pressure visibility for BOP control
- Valve Actuation Speed: 3-position 4-way valves and pneumatic control valves enable BOP actuation in ≤3 seconds, meeting API 16D emergency well control response requirements
- Accumulator Performance: NXQ bladder accumulators maintain stable hydraulic pressure reserve, with a 840L total volume capacity and 10-year design service life for bladders
- Pneumatic Pump Efficiency: QYB40 series pneumatic pumps deliver 1:50 pressure ratio, with a maximum output pressure of 40MPa and zero hydraulic leakage under full load
- Sealing Reliability: V-shape packing and textile sealing rings provide zero-leakage sealing for hydraulic circuits, with temperature resistance from -40°C to 150°C
Structural Design Features
- OEM-Matched Dimensional Accuracy: All parts follow original FKQ840-8 engineering drawings, requiring no modifications or custom fitting for direct installation
- Modular Subsystem Layout: Separable pneumatic, hydraulic, and accumulator assemblies enable targeted part replacement without full system disassembly
- Explosion-Proof & Corrosion Resistance: Valve bodies and pressure components feature anti-corrosion coating, suitable for hazardous gas Zone 1 drilling environments
- Quick-Connect Interface: Standardized valve and hose connections enable fast, error-free replacement, cutting repair downtime by up to 70%
- Wear-Resistant Components: Cylinder liners, piston rods, and valve cores feature hardened surface treatment to reduce abrasive wear by 55%
Applicable Operating Conditions
These FKQ840-8 BOP control unit spare parts are certified for use in extreme oilfield well control environments, optimized for the following parameters:
- Onshore/offshore drilling rigs equipped with FKQ840-8 BOP hydraulic-pneumatic control units
- API 16D compliant well control and BOP actuation operations
- Operating ambient temperature: -40°C to 70°C; relative humidity: 5-95% non-condensing
- High-dust, high-vibration, and hazardous gas drilling sites
- Continuous standby and emergency BOP actuation operations
Maintenance & Troubleshooting Best Practices
- Routine Safety Inspection (Every 90 Days): Calibrate pressure gauges, check accumulator bladder pressure, and inspect valve leaks; verify pneumatic regulator output pressure
- Preventive Wear Part Replacement (Every 180 Days): Replace V-shape packing, sealing rings, and accumulator inflation valves; clean air filtering and reducing valves
- Hydraulic System Care: Inspect cylinder liners and piston rods quarterly for scoring; lubricate moving components with high-pressure hydraulic oil
- Pneumatic System Maintenance: Drain moisture from air lines monthly; replace air filter elements to prevent valve contamination
- Accumulator Servicing: Test bladder integrity bi-annually; replace worn bladders and inflation valves to maintain pressure reserve capacity
- We supply the following spare parts:
| ITEM | DESCRIPTION | PART NUMBER | M.E.S.C |
| 1 | PRESSURE GAUGE 0-25 MPA | Y-100-III | 0364800073 |
| 2 | PRESSURE GAUGE 0-40 MPA, (P/NO.Y-100-III) GENERAL SPEC.=? | Y-100-III | 0364800089 |
| 3 | PRESSURE GAUGE 0-2.5 MPA, (P/NO.Y-100-III) | Y-100-III | 0364800093 |
| 4 | CHECK VALVE | DXQF-00-00 | 0364800053 |
| 5 | 3 POSITION 4 WAY VALVE | 34ZS21-25 | 0364800253 |
| 6 | 3″ AIR CYLINDER | 3″QG-00-00 | 0364800243 |
| 7 | REGULATOR | JYS21-25 | 0364800293 |
| 8 | 1:50 PNEUMATIC PUMP | QYB40-60L | 0364800393 |
| 9 | RUBBER BLADDER, POS. 18 | 0364800853 | |
| 10 | INFATING VALVE, POS. 23 | 0364800873 | |
| 11 | VALVE, POS. 16 | 0364800833 | |
| 12 | SPRING, POS. 15 | 0364800823 | |
| 13 | DISCHARGE VALVE CORE | 3GB-00-05 | 0364801013 |
| 14 | SUCTION VALVE SEAT | 3GB-00-03 | 0364801023 |
| 15 | V SHAPE PACKING | QYB-00-04 | 0364801373 |
| 16 | CONNECTING ROD | QYB-00-22 | 0364801383 |
| 17 | SLEEVE | 150QMD-00-28 | 0364801393 |
| 18 | CYLINDER LINER | 150QMD-00-17 | 0364801413 |
| 19 | PISTON ROD | 150QMD-00-19 | 0364801423 |
| 20 | PNEUMATIC PISTON | 150QMD-00-18 | 0364801443 |
| 21 | VALVE CORE | 3.4HXF-02-00 | 0364801673 |
| 22 | SPRING SLEEVE | SDTYF-01-00 | 0364801833 |
| 23 | INNER SPRING | SDTYF-00-03 | 0364801843 |
| 24 | OUTER SPRING | SDTYF-00-05 | 0364801853 |
| 25 | GUIDE RING | SDTYF-00-06 | 0364801863 |
| 26 | DIAPHRAGM | QDTYF-00-02 | 0364802113 |
| 27 | SPRING SEAT | SDTYF-00-04 | 0364802313 |
| 28 | TAPPET | SDTYF¬-03 | 0364802323 |
| 29 | GUIDE RING | SDTYF¬-01 | 0364802333 |
| 30 | VALVE CORE | 2.4HXF-01-00 | 0364802763 |
| 31 | HYDROPNEUMATIC PRESSURE SWITCH | QKY21-15 | 0364803003 |
| 32 | 1/4″ MAIN AIR CONTROL VALVE | 1/4″KQKF-00-00 | 0364803203 |
| 33 | 3-POSITION 4-WAY AIR SLIDING VALVE | 34TQHY-L6-F | 0364803503 |
| 34 | AIR HOSE BUNDLE P/NO.=? | 0364803859 | |
| 35 | AIR MANUAL OPERATE REGUALING VALVE TYPE: JYSQ-21,25B | 9161400000 | 0364804053 |
| 36 | NXQ/MODEL BLADDER ACCUMULATOR | 4807101031 | 0364804063 |
| 37 | INFLATING VALVE FOR NXQ/MODEL BLADDER ACCUMULATOR (BLADDER ACCUMULATOR P/N: 4807101031) | 0364804103 | |
| 38 | NXQ/MODEL BLADDER ACCUMULATOR | 4807101036 | 0364804093 |
| 39 | INFLATING VALVE FOR NXQ/MODEL BLADDER ACCUMULATOR (BLADDER ACCUMULATOR P/N: 4807101036) | 0364804113 | |
| 40 | AIR FILTERING AND REDUCING VALVE, QFH-261 | 0364804123 | |
| 41 | AIR OPERATED OIL PUMP, TYPE: QYB40-165L | 9165200000 | 0364804933 |
| 42 | CONNECTING ROD | 9160200028 | 0364805233 |
| 43 | CROSS HEAD | 9160200027 | 0364805243 |
| 44 | CROSSHEAD SHAFT | 9160100021 | 0364805303 |
| 45 | RETAINING FLAT | 9160100022 | 0364805313 |
| 46 | CYLINDER QB21-80 | 9160100014 | 0364805383 |
| 47 | PLUNGER QB21-80 | 9160100015 | 0364805393 |
| 48 | CROSS HEAD | 9160200027 | 0364805243 |
| 49 | V-PRESSING RING FOR MODEL QB21-80 | 9160500045 | 0364805093 |
| 50 | V-TEXTILE SEALING RING FOR MODEL QB21-80 | 9160500044 | 0364805103 |
| 51 | VALVE SEAT | 9160900007 | 0364805553 |
| 52 | RETAINING RING | 9160900006 | 0364805573 |
| 53 | VALVE SEAT | 9161000001 | 0364805763 |
| 54 | WAVE SPRING | 9161100022 | 0364805783 |
| 55 | PRESSURE REDUCING SEALING RING | 9161200017 | 0364806023 |
| 56 | RETAINING RING | 9161100020 | 0364806033 |
Field Fault Repair Cases (Real Drilling Site Scenarios)
Case 1: BOP Control Pressure Loss & Accumulator Bladder Leak
Field Scenario: A land rig’s FKQ840-8 BOP control unit experienced rapid hydraulic pressure drop, disabling BOP actuation capability.
Root Cause: Ruptured NXQ accumulator bladder (0364800853) and faulty inflation valve (0364804103) caused pressure leakage.
Resolution: Replaced the damaged bladder and inflation valve, repressurized the accumulator, and pressure-tested the system. Full pressure reserve and BOP control function were restored.
Case 2: Pneumatic Valve Failure & Delayed BOP Actuation
Field Scenario: The FKQ840-8 control unit exhibited delayed BOP actuation, failing to meet API 16D response time requirements.
Root Cause: Stuck 3-position 4-way valve (34ZS21-25) and clogged air filtering reducing valve (QFH-261) restricted pneumatic flow.
Resolution: Replaced the faulty directional valve and filter regulator, purged air lines, and tested actuation speed. Normal BOP response time was restored.
Case 3: Hydraulic Seal Leak & Control Unit Contamination
Field Scenario: A FKQ840-8 BOP control unit showed severe hydraulic leakage around the pneumatic pump cylinder, contaminating the control panel.
Root Cause: Degraded V-shape packing (QYB-00-04) and worn cylinder liner (150QMD-00-17) caused hydraulic fluid leakage.
Resolution: Replaced the sealing assembly and cylinder liner, resealed the pump housing, and refilled hydraulic fluid. Leakage was eliminated, and system performance was restored.
Frequently Asked Questions (FAQ)
| Question | Answer |
| Are these parts fully compliant with API 16D BOP control standards? | Yes, every spare part is manufactured to meet API 16D well control requirements and OEM specifications, ensuring full safety compliance for FKQ840-8 units. |
| What is the service life of key wear parts for the FKQ840-8 model? | Accumulator bladders last 3-5 years under normal use; pressure gauges and sealing rings have a 1-2 year service life, while control valves last 50,000+ actuation cycles. |
| Can I source individual hydraulic or pneumatic parts separately for the FKQ840-8? | Absolutely, you can order any single component from this list based on your maintenance or repair needs, with full quality and safety certification for every part. |
Procurement Guidance & Call to Action
For safety maintenance teams, procurement specialists, and rig operators relying on the FKQ840-8 BOP control unit for critical well control operations, this verified spare parts list is your definitive sourcing and technical reference. Each part is labeled with its original part number, M.E.S.C code, and subsystem location for hassle-free ordering, meeting strict API and industrial safety standards to ensure equipment reliability and regulatory compliance. Whether you need to stock critical safety spares for routine preventive maintenance, replace failed components during emergency well control repairs, or refurbish hydraulic-pneumatic systems, these high-quality, OEM-matched parts deliver the durability and precision required for hazardous oilfield conditions. Reference the detailed part numbers and quantity specifications below to secure the exact components you need, and leverage the included maintenance guidelines to resolve on-site faults efficiently and maintain uninterrupted BOP control safety.
