Rexroth R431006326, ZJ-45, ZJ-70

Introduction

We specialize in the manufacturing and supply of high-precision, industrial-grade components tailored for oil drilling rigs, hydraulic systems, boiler systems, mud pumps, and heavy-duty mechanical drive units. Our comprehensive product range includes critical parts such as the Rexroth valve R431006326/P63985-0/7P-9S, ZJ-45 braking device with dual-purpose air relay QF-506-0, ZJ-70 electromagnetic eddy current brake & DSF-70-15-12 coil, WNS1-1.25 boiler solenoid valve DZ023D, and BOMCO F1300/1600 CP170 dedicated piston. Engineered to withstand the extreme pressures, temperatures, and mechanical stresses of offshore and onshore drilling operations, our parts are manufactured to meet or exceed OEM specifications. Adhering to stringent international standards including ISO 9001:2015, API 6A, ASME B16.34, and Ex d IIB T4 for hazardous areas, we ensure unmatched reliability, seamless compatibility, and extended service life. This technical dossier serves as an authoritative reference for procurement, maintenance, and fault diagnosis, designed to minimize operational downtime and optimize total cost of ownership (TCO) for our clients.

Core Purpose & Target User Needs

Our product range is specifically engineered to fit key equipment models including ZJ-45, ZJ-70, ZJ-50D, ZJ-30C, JC70B drawworks, BOMCO F800/F1300/F1600 mud pumps, WNS0.5/WNS1/WNS2 series boilers, and DQ250Z top drives. Target users include senior procurement managers, certified field maintenance technicians, E&P project engineers, and rig superintendents operating in the oil & gas, geothermal, and water well drilling sectors. These professionals consistently grapple with critical pain points: catastrophic equipment failure due to low-quality replacement parts, inefficient maintenance leading to unplanned rig downtime, difficulty sourcing exact replacement components for complex systems, and the high cost of emergency repairs. Our core value proposition lies in providing 100% interchangeable, OEM-quality parts that reduce unplanned maintenance events by an average of 48%, extend component lifespan by up to 35%, and ensure operational safety in Class I, Div 1 hazardous environments.

Product Introduction

Core Product Categories & Key Specifications

1. Hydraulic Valves & Actuation Systems

• Rexroth Valve Assembly R431006326/P63985-0/7P-9S: A modular directional control valve designed for mobile and industrial hydraulic applications. Features 9 pressure stages and 7 operating positions, with a maximum operating pressure of 35 MPa and flow rate of 120 L/min.

• Hydraulic Station Hose & Valve Assembly DQ026.07.00: Pre-assembled fluid power system integrating high-pressure hoses (rated for 42 MPa) and custom-machined valve manifolds, ensuring leak-free operation in demanding hydraulic stations.

• Spring Safety Valve ZJ70D SCAT27W-10T 1 1/2"×1 1/2": A direct-acting safety relief valve set at 10 bar (1 MPa), constructed from forged carbon steel with a stainless steel spring, designed to protect ZJ70D drilling rig systems from overpressure.

2. Mechanical Transmission & Brake Components

• ZJ-45 Dual-Purpose Air Relay QF-506-0 & Braking Device: Integrates air control and pressure regulation functions, supporting both service and emergency braking for ZJ-45 rigs. Operates at 0.5-0.8 MPa with a response time of ≤ 0.2 seconds.

• ZJ-70 Electromagnetic Eddy Current Brake & DSF-70-15-12 Coil: Provides non-contact, wear-free dynamic braking for ZJ-70 drawworks. The coil delivers 1500 N·m of braking torque at 12 VDC, ensuring rapid deceleration of heavy loads.

• Friction Disc W18-07-905 & ZJ30C Dynamic Friction Disc 508725: High-friction, heat-resistant discs engineered for heavy-duty clutch and brake systems. Operate at temperatures up to 350°C with a coefficient of friction (μ) of 0.45-0.55.

3. Boiler & Electrical Control Parts

• WNS1-1.25 Boiler Solenoid Valve DZ023D 220V 8W: A two-way normally closed solenoid valve for steam/water control. Features a brass body, PTFE seal, and IP65 protection, with a flow coefficient (Cv) of 0.8 m³/h.

• WNS2-1.25-Y AC Contactor B6-30-10 220V: A three-pole contactor rated for 30 A continuous current, designed for control circuits in industrial boilers. Equipped with silver alloy contacts for high arc resistance.

• 20-Core TY57K20TVA DC Motor & SK-2Z16 Power Board (PC1 Board 0509-1200-03): High-reliability electrical components for control panels and instrumentation systems. The motor delivers 200 W power at 24 VDC, while the power board ensures stable signal processing.

4. Filters, Seals & Wear Parts

• Filter Elements 4N0015, 3825133, 29510918 & B236: High-efficiency filtration solutions for engine oil, hydraulic fluid, and diesel systems. The 4N0015 element offers 99.9% efficiency at 10 μm, protecting critical engine components.

• O-Rings FH2835-10 (ф965×95) & 530301011900035507: Precision-machined elastomer seals manufactured from Viton® and HNBR, respectively, ensuring leak-proof sealing in high-pressure (up to 40 MPa) and high-temperature (up to 200°C) applications.

• Bearing B6040 (200X310X51) for JC70B Drawworks: A high-precision cylindrical roller bearing rated at ISO Class P4, capable of withstanding radial loads up to 1200 kN and axial loads up to 150 kN.

Function Description

Core Functional Benefits

Hydraulic System Optimization

The Rexroth R431006326 valve provides precise, proportional control of fluid direction and pressure, enabling smooth operation of winches, cylinders, and power tongs. The spring safety valve SCAT27W-10T acts as a critical last line of defense, automatically relieving excess pressure to prevent catastrophic hose or component failure, thus safeguarding personnel and equipment.

Enhanced Safety & Reliability

The ZJ-45 QF-506-0 air relay ensures fail-safe operation of the braking system, while the ZJ-70 electromagnetic brake offers instantaneous, vibration-free stopping power—essential for maintaining precise control of heavy drill strings during tripping operations. The electromagnetic eddy current brake eliminates mechanical wear associated with friction brakes, reducing maintenance requirements.

Equipment Longevity

Our premium filter elements and O-ring seals prevent particulate contamination and fluid leakage, the leading causes of premature component wear and hydraulic system failure. The B6040 bearing and friction discs are engineered for high load capacity and thermal stability, ensuring reliable operation even in the harshest drilling environments.

Structural Features

Design Engineering & Material Science

Precision Manufacturing

• Rexroth Valve R431006326: Spool and sleeve components are ground to IT4-5 tolerance, ensuring micron-level precision for smooth, chatter-free operation. The valve body is precision-cast from ductile iron, offering high impact strength.

• B6040 Drawworks Bearing: Manufactured from high-carbon chromium steel (GCr15SiMn) with a surface hardness of 62-65 HRC. The raceways are super-finished (Ra ≤ 0.2 μm) to reduce friction and noise.

• O-Rings FH2835-10: Molded from premium Viton® fluoroelastomer, offering exceptional resistance to mineral oils, hydraulic fluids, and thermal oxidation. Maintains sealing performance at temperatures from -20°C to 200°C.

Robust Mechanical Design

• ZJ-70 Electromagnetic Brake Coil DSF-70-15-12: Wound with high-conductivity copper wire and encapsulated in a heat-dissipating aluminum housing. Features an insulation class of F (155°C) and IP65 ingress protection.

• BOMCO CP170/CP140 Piston: Constructed from high-strength, wear-resistant polyurethane with a steel core. The piston incorporates multiple lip seals to ensure positive sealing and prevent mud contamination into the fluid end.

Applicable Working Conditions

All products are rigorously tested to perform reliably in the following extreme operational environments:

Maintenance & Care Recommendations

Prolonged service life and peak performance depend on adherence to the following maintenance protocols:

Critical Components Maintenance Schedule

1. Rexroth Valve R431006326

￮ Inspection: Bi-monthly. Check for external leakage and spool free play.

￮ Cleaning: Annually. Flush with filtered hydraulic fluid to remove deposits.

￮ Replacement: Every 18,000 operating hours or 24 months, whichever occurs first.

2. ZJ-70 Electromagnetic Eddy Current Brake

￮ Coil Inspection: Monthly. Measure coil resistance; replace if outside 1.5-2.5 Ω tolerance.

￮ Braking Force Test: Quarterly. Verify torque output matches specification (1500 N·m).

￮ Seal Replacement: Bi-annually. Inspect and replace O-ring seals if signs of degradation are visible.

3. Filter Elements (4N0015, 3825133)

￮ Replacement: Based on differential pressure indicator (> 0.15 MPa) or every 3 months, regardless of indicator reading.

4. B6040 Drawworks Bearing

￮ Lubrication: Every 500 hours. Re-lubricate with ISO VG 220 synthetic gear oil.

￮ Replacement: Every 24 months or 15,000 hours, to prevent fatigue failure.

We supply the following spare parts:

On-Site Fault Maintenance Cases

Case 1: ZJ-70 Drawworks Brake Failure

Fault Phenomenon: A ZJ-70 drilling rig's drawworks failed to stop during an emergency trip operation, resulting in a near-miss. The brake pedal traveled to the floor with no resistance.

Root Cause Analysis: Inspection revealed severe wear of the ZJ-70 dynamic friction disc (W18-07-905) due to prolonged use without replacement. The disc's friction material had worn below the service limit of 3.5 mm, causing total loss of braking torque.

Solution: Removed and discarded the worn friction disc. Installed a new W18-07-905 friction disc and adjusted the brake clearance to the manufacturer's specification (0.5-0.8 mm). Performed a full system brake test.

Result: Restored full braking functionality. The rig resumed safe operation with a braking torque of 1520 N·m, within specification.

Case 2: Rexroth Valve R431006326 Spool Sticking

Fault Phenomenon: A hydraulic wind on a ZJ-50D rig became inoperable, drifting uncontrollably. The directional control valve (R431006326) failed to shift between positions.

Root Cause Analysis: Disassembly revealed contamination by fine metal particles and sludge in the valve spool and sleeve. The high operating pressure had caused the spool to seize in the neutral position.

Solution: Ultrasonically cleaned the valve spool and sleeve in filtered hydraulic fluid. Replaced the O-ring seals (530301011900035507) and flushed the entire hydraulic circuit with new fluid (ISO VG 46). Reassembled and calibrated the valve.

Result: Valve operation restored to smooth, precise control. No further sticking occurred after 6 months of operation.

Case 3: WNS1-1.25 Boiler Solenoid Valve DZ023D Leakage

Fault Phenomenon: A WNS1-1.25-Y boiler experienced water leakage from the solenoid valve (DZ023D 220V), leading to water hammer and potential equipment damage.

Root Cause Analysis: The valve's internal PTFE seat had become eroded due to high-velocity water flow and minor cavitation. The seal could no longer maintain a positive shutoff.

Solution: Replaced the complete solenoid valve assembly with a new DZ023D 220V 8W unit. Installed a strainer upstream to prevent future particulate damage.

Result: Eliminated the leakage. Boiler steam pressure maintained a stable setpoint of 1.25 MPa with no further incidents.

FAQ (Frequently Asked Questions)

Procurement Guide & Technical Support

We are dedicated to supplying the oil and gas drilling industry with the highest quality components. Every part in our catalog undergoes a rigorous three-stage quality assurance process:

1. Incoming Material Test: Certificate of Analysis (CoA) verification for all raw materials.

2. In-Process Inspection: 100% dimensional verification of critical features using Coordinate Measuring Machines (CMM).

3. Final Performance Test: Functional and pressure testing of assembled products to ensure compliance with API and ISO standards.

Our product range offers a cost advantage of 20-35% compared to original OEM parts, without compromising on quality or performance. We provide comprehensive technical support, including:

• Free engineering consultation for system integration and replacement part selection.

• Proactive maintenance scheduling and reliability analysis.

• On-site technical support for complex installations and fault resolution.

To inquire about purchasing any of the products listed, including the Rexroth R431006326 valve, ZJ-70 DSF-70-15-12 brake coil, WNS1-1.25 DZ023D solenoid valve, and BOMCO CP170 piston, please submit your detailed requirements via our procurement channel. Provide the part number, equipment model, and required quantity. Our sales team will promptly provide a formal quotation, product datasheets, and quality certification documents.

Choose our industrial parts to minimize downtime, reduce maintenance costs, and ensure the safe, efficient operation of your drilling rigs and process systems. We look forward to being your trusted partner for all your procurement and technical supply needs.

contact us ：

Emeil: [email protected]   whatsapp: +86 15275658619

Should you have any purchase intentions, please contact us – we will offer you our most favorable price.