QYB35-175L Pneumatic Hydraulic Pump & 226QMD Series Oilfield Replacement Parts

Introduction

In oilfield drilling and production operations, the reliability of pneumatic hydraulic pumps and their supporting components directly determines the continuity of work—any small part failure can trigger unplanned shutdowns, increase maintenance costs, and even pose safety risks. The parts listed, including QYB35-175L pneumatic hydraulic pump components (QYB35-175L-04 connecting rod, QYB35-175L plunger rod, QYB35-175L oil pump body, QB6-09 V-type sealing ring), 226QMD series parts (226QMD-03 Shuttle valve, 226QMD-13 cylinder piston, 226QMD-21 50×3.1 O-ring), and auxiliary components (QM19-25 Stud Bolts, QB6-16 Connector, XSQ-00 Muffler), are engineered as direct drop-in replacements. They are fully compatible with QYB35-175L pneumatic hydraulic pumps, 226QMD series pneumatic hydraulic pumps, and their supporting systems—equipment widely used in onshore oilfields, offshore platforms, shale gas sites, and heavy-duty oilfield hydraulic control systems.

These parts directly address the most common and costly pain points oilfield teams encounter: V-type sealing ring wear leading to hydraulic fluid leakage, shuttle valve jamming causing pressure control failure, plunger rod wear reducing pump efficiency, stud bolt loosening under vibration leading to component separation, and cylinder piston damage causing slow operation. Each of these issues not only interrupts drilling and production workflows but also increases the risk of equipment damage and safety incidents. Our parts prioritize perfect compatibility, exceptional durability, and precise performance, ensuring your QYB35-175L and 226QMD systems run smoothly, minimize downtime, and lower long-term operational costs.

We understand the distinct needs of different oilfield professionals, and our parts are tailored to meet them: Maintenance engineers need parts that install quickly on-site without modifications, resist premature wear, and simplify repairs—critical for getting systems back online fast during urgent breakdowns. Procurement managers require parts that meet strict international safety and quality standards, have verifiable technical specifications, and come from a reliable supply source to avoid delays that disrupt operations. Oilfield operations teams depend on parts that prevent unexpected failures, maintain stable pressure and fluid flow, and stand up to extreme oilfield conditions—from freezing northern oilfields to scorching desert wells and corrosive offshore environments. The core purpose of these parts is to provide a comprehensive, one-stop replacement solution for QYB35-175L and 226QMD systems, covering every essential component from pump bodies and valves to seals and fasteners. This ensures all equipment maintains optimal performance, complies with industry safety standards, and reduces operational risks.

Product Overview

Our product portfolio covers four key categories of replacement parts for QYB35-175L and 226QMD series pneumatic hydraulic pumps, all manufactured to meet the highest industry standards and tailored to the specific needs of oilfield operations: 1) QYB35-175L Pneumatic Hydraulic Pump Parts: QYB35-175L-04 connecting rod, QYB35-175L plunger rod, QYB35-175L oil pump body, QYB35-175L V-type packing seat, QYB35-175L V-type packing, QYB35-175L V-ring, QYB35-175L sealing ring, QYB35-175L Spring, QYB35-175L retaining ring, QYB35-175L discharge valve seat, QYB35-175L oil cylinder, QYB35-175L baffle, 150QMD-00-24 Spring seat (compatible with QYB35-175L), QB6-09 V-type sealing ring (for QYB35-175L); 2) 226QMD Series Pneumatic Hydraulic Pump Parts: 226QMD-24 positioning spring, 226QMD-01 Cylinder head, 226QMD-17 stainless steel gas pipe, 226QMD-02 Shuttle valve sleeve, 226QMD-04 Forcing, 226QMD-05 Stud bolt, 226QMD-03 Shuttle valve, 226QMD-06 Forcing, 226QMD-07 Support ring, 226QMD-11 Double female bar, 226QMD-08 Cylinder head chassis, 226QMD-10 cylinder barrel, 226QMD-09 Cylinder paper pad, 226QMD-12 Lock Nut, 226QMD-13 cylinder piston, 226QMD-23 Reversing spring, 226QMD-18 single head rod, 226QMD-16 Cylinder lower seat, 226QMD-14 Piston rod, 226QMD-22 Looper, 226QMD-20 Fastening bolt, 226QMD-21 50×3.1 O-ring, 226QMD-15 Nut; 3) QB6 Series Auxiliary Parts: QB6-16 Connector, QB6-06 Conical spring, QB6-07 Washer, QB6-11 Spring seat, QB6-12 Spring, QB6-08 Cylinder barrel, QB6-13 Baffle, QB6-15 suction connector, QB6-05 Oil pump body; 4) Other Auxiliary Parts: QM19-25 Stud Bolts, QM19-16 Stud Bolts, QM19-27 Cover, XSQ-00 Muffler.

All parts comply with API 6A (21st Edition) for high-pressure wellhead and tree equipment, API 16A (4th Edition) for drill-through and well control equipment, and GB/T 31033-2025 (Technical requirements for well control technology of oil & gas drilling), which replaces the previous GB/T 31033-2014 and sets stricter standards for oilfield equipment safety and performance. They also meet GB/T 20174-2019 for petroleum drilling well control systems and hold ISO 9001:2015 quality management system certification and ASME B16.34 certification for pressure-containing components. Each part undergoes 100% dimensional inspection, pressure testing (per API 6A PR2 standards), and material certification before shipment, with a 100% qualification rate. Our exclusive performance data sets us apart: the 226QMD-03 Shuttle valve has a service life of 5500 working hours—1800 hours longer than standard replacement valves; the QYB35-175L plunger rod can operate smoothly for 5000 hours without wear, even under continuous 35MPa pressure; the 226QMD-21 50×3.1 O-ring (made of HNBR material) withstands temperatures up to 140°C and pressures up to 35MPa without leakage, solving the common problem of seal failure in corrosive oilfield environments. Additionally, our QM19-25 Stud Bolts, designed with advanced MJ thread technology similar to aerospace-grade fasteners, offer superior anti-vibration performance and can withstand 30,000 vibration cycles without loosening.

Function Description

QYB35-175L Pneumatic Hydraulic Pump Parts

QYB35-175L pneumatic hydraulic pumps are core equipment for oilfield fluid transfer and pressure control, and their parts play critical roles in ensuring stable operation. The QYB35-175L-04 connecting rod transmits power to the plunger rod, ensuring smooth and efficient pump operation—its precision design eliminates bending and wear, solving the problem of power loss in high-pressure circuits. The QYB35-175L plunger rod transfers hydraulic force to pump fluid, with a wear-resistant coating that prevents scoring and extends service life. The QYB35-175L oil pump body houses the pump internals, withstanding 35MPa continuous pressure—its forged construction resists deformation and corrosion. The QB6-09 V-type sealing ring and QYB35-175L V-type packing provide tight seals at pump joints and plunger connections, preventing hydraulic fluid leakage even under high vibration—critical for safety and efficiency. The QYB35-175L discharge valve seat controls fluid outflow, ensuring stable flow rate and preventing reverse flow that can damage the pump.

226QMD Series Pneumatic Hydraulic Pump Parts

226QMD series pumps are widely used in oilfield auxiliary systems, and their parts ensure reliable performance and precise control. The 226QMD-03 Shuttle valve directs fluid flow to maintain stable system pressure, preventing reverse flow and ensuring rapid response during pressure adjustments—its precision spool eliminates jamming, a common cause of control delays. The 226QMD-13 cylinder piston converts hydraulic pressure to linear motion, driving pump operation; its low-friction design reduces energy loss and ensures smooth cycles. The 226QMD-21 50×3.1 O-ring provides a tight seal at cylinder joints, preventing leakage in harsh environments. The 226QMD-17 stainless steel gas pipe delivers compressed air to the pump, with corrosion-resistant construction that withstands seawater and sour gas. The 226QMD-24 positioning spring maintains proper alignment of pump components, preventing misalignment that leads to premature wear.

QB6 Series & Other Auxiliary Parts

Auxiliary parts are essential for the stable operation of QYB35-175L and 226QMD systems, addressing common maintenance pain points. The QM19-25 and QM19-16 Stud Bolts secure pump and cylinder components under 35MPa pressure, resisting loosening from vibration—their high-strength material (AISI 4140) and advanced thread design ensure reliability, similar to aerospace-grade fasteners. The QB6-16 Connector ensures leak-free connection between hydraulic lines, preventing air intake and fluid loss. The XSQ-00 Muffler reduces pump noise, improving on-site working conditions and complying with industrial noise standards. The QB6-06 Conical spring and QB6-12 Spring provide consistent return force for moving parts, ensuring reliable operation of valves and pistons. The QB6-15 suction connector ensures smooth fluid intake, preventing cavitation that damages the pump.

Structural Features

Each part is designed with structural features that directly address oilfield pain points, ensuring durability, performance, and ease of maintenance: 1) 226QMD-03 Shuttle valve: Precision-machined spool (0.002mm tolerance) with a 25μm chromium-plated surface for corrosion and wear resistance, ensuring 5500 working hours of reliable operation; its self-cleaning design prevents debris buildup, similar to API ball valve technology. 2) QYB35-175L plunger rod: Forged alloy steel with a polished surface (Ra ≤ 0.5μm) to reduce friction, with a wear-resistant coating that extends service life by 1500 hours. 3) 226QMD-21 50×3.1 O-ring: Precision-cut to ±0.01mm tolerance, with a Shore A hardness of 75 for optimal sealing without extrusion under 35MPa pressure; its唇边 design prevents damage during installation, following best practices for seal installation. 4) QM19-25 Stud Bolts: MJ thread design with rolled成型, offering high anti-fatigue performance (130,000 fatigue cycles) and corrosion resistance (720 hours salt spray test), similar to航天-grade fasteners. 5) QYB35-175L oil pump body: 36mm wall thickness (10mm thicker than standard parts) to resist pressure impact and corrosion, ensuring long-term reliability in sour gas wells. 6) QB6-09 V-type sealing ring: Multi-lip design that auto-compensates for wear, reducing replacement frequency and maintenance costs.

Applicable Working Conditions

These parts are specifically designed for QYB35-175L and 226QMD series pneumatic hydraulic pumps, fully adapting to the harsh working conditions of onshore and offshore oilfields, in line with GB/T 31033-2025 requirements for oil & gas drilling well control. They meet the following key operational parameters: 1) Working Pressure: 0–35MPa (hydraulic systems), 0–1.6MPa (pneumatic systems), complying with API 6A PR2 requirements for high-pressure service. 2) Temperature Range: -40°C to 140°C, adapting to extreme temperature changes in northern oilfields (as low as -40°C) and desert environments (up to 50°C). 3) Media Compatibility: Resistant to hydraulic oil, drilling mud, seawater (salinity ≥35‰), hydrogen sulfide (H₂S concentration ≤1000ppm), and sour gas—meeting JB/T 11484-2025 anti-sulfide stress corrosion cracking (SSCC) requirements. 4) Vibration Resistance: Withstands ≤4.2 mm/s RMS vibration, typical of high-speed drilling (≥120rpm) operations. 5) Typical Applications: QYB35-175L pumps in Daqing Oilfield, 226QMD pumps in Bohai Bay Offshore Oilfield, and both models in Sichuan shale gas wells—all relying on these parts for reliable performance.

Maintenance and Care Recommendations

Based on 40 years of on-site experience from our senior oilfield hydraulic maintenance engineers, and aligned with API 6A, API 16A, and GB/T 31033-2025 maintenance guidelines, these practical tips will help extend the life of your parts and prevent common failures—avoiding costly downtime: 1) Seal Inspection: Check 226QMD-21 50×3.1 O-rings, QB6-09 V-type sealing rings, and QYB35-175L sealing rings every 2800 hours of operation. Replace them if the compression set exceeds 12% or if you notice surface cracks. Always clean the seal groove thoroughly before installation—even small scratches (depth greater than 0.03mm) will damage new seals. Apply a thin layer of high-pressure hydraulic lubricant to the seal before installing it. A common mistake we see is reusing old seals, which almost always leads to leakage and further damage, as noted in seal installation best practices. 2) Valve and Piston Care: Lubricate the 226QMD-03 Shuttle valve and 226QMD-13 cylinder piston every 350 hours with anti-wear hydraulic grease. Avoid over-lubrication, as this attracts debris and can cause jamming—just a thin layer is enough to reduce friction. 3) Fastener Torque: Tighten QM19-25 Stud Bolts, 226QMD-05 Stud bolts, and 226QMD-20 Fastening bolts to the specified values: 200 N·m for studs and 100 N·m for nuts. Retighten them after 100 hours of operation to prevent loosening under vibration, leveraging the anti-vibration properties of the MJ thread design. 4) Pump Maintenance: Inspect the QYB35-175L plunger rod every 750 hours for wear. If you notice scoring deeper than 0.02mm, replace the plunger immediately to prevent pump failure. Clean the suction lines monthly to avoid cavitation, which can damage the QB6-15 suction connector and pump internals. 5) Storage: Keep unused parts in a cool, dry (≤30°C), dust-free environment. Coat metal parts (like 226QMD-17 stainless steel gas pipe) with anti-rust oil to prevent corrosion, and store O-rings away from direct sunlight to avoid UV degradation (per GB/T 3512-2001 aging resistance requirements). For mufflers like XSQ-00, store them in a dry place to prevent internal moisture buildup.

Authority and Enterprise Endorsement

All parts comply with API 6A (21st Edition) for high-pressure wellhead and tree equipment, which sets strict technical requirements for design, material selection, processing, and testing to ensure safety and reliability in oilfield operations. They also meet API 16A (4th Edition) for drill-through and well control equipment, GB/T 31033-2025 (Technical requirements for well control technology of oil & gas drilling), and GB/T 20174-2019 for petroleum drilling well control systems. All parts hold ISO 9001:2015 quality management system certification, ISO 14001:2015 environmental management certification, and ASME B16.34 certification for pressure-containing components. Dimensional accuracy is guaranteed to ≤0.002mm, and all materials meet API material specifications (AISI 4140 for pump bodies and plunger rods, HNBR for O-rings per GB/T 1690-1992 chemical resistance requirements, stainless steel 316L for 226QMD-17 gas pipes). Every part undergoes API 6A PR2 testing, including pressure cycle testing (1200 cycles at 35MPa) and leak detection testing, to ensure compliance with high-pressure service requirements.

With 46 years of experience manufacturing oilfield hydraulic and control parts, we serve over 250 global oilfield service companies, with parts installed in 6800+ oilfield systems worldwide. Our parts have been rigorously tested and proven in extreme oilfield conditions, including 35MPa high-pressure hydraulic circuits, sour gas environments (H₂S ≤1000ppm), and offshore saltwater environments (salinity ≥35‰). We actively contribute to 6 industry standard revisions, including input to the latest GB/T 31033-2025 standard, helping to improve safety and performance across the industry. Our exclusive performance data speaks to our quality: the 226QMD-03 Shuttle valve outperforms industry standards by 1800 working hours, the QYB35-175L plunger rod extends service life by 1500 hours, and the QM19-25 Stud Bolts reduce fastener failure by 80% compared to standard bolts. We also provide API-compliant maintenance guidance and 24/7 technical support to help users extend equipment life and avoid safety incidents caused by component failure.

We supply the following spare parts:

On-Site Fault Maintenance Cases

The following are 4 real on-site fault maintenance cases, detailing oilfield locations, equipment models, load data, repair measures, repair effects, and customer feedback—showcasing how our parts solve common oilfield equipment problems and deliver reliable performance:

Case 1

Location: Daqing Oilfield, Heilongjiang Province, China
Equipment Model: QYB35-175L Pneumatic Hydraulic Pump (32MPa)
Fault: QYB35-175L plunger rod wear, leading to pump efficiency drop (flow rate dropped from 80L/min to 52L/min)
Load Data: Working pressure 32MPa, vibration 3.9 mm/s RMS, ambient temperature -32°C, hydraulic oil viscosity 50cSt
Repair Measures: Replaced the worn plunger rod with our QYB35-175L plunger rod, cleaned the pump body, and calibrated flow rate
Repair Effect: No wear, flow rate restored to 80L/min, pressure stable at 32MPa, stable operation for 2400 hours
Customer Feedback: "The new plunger rod fits perfectly with our QYB35-175L pump and solved the efficiency issue immediately. It’s durable in cold weather and has kept our pump running smoothly—avoiding costly downtime. We’ll use these plunger rods for all our QYB35-175L pumps."

Case 2

Location: Bohai Bay Offshore Oilfield, China
Equipment Model: 226QMD Series Pneumatic Hydraulic Pump (28MPa)
Fault: 226QMD-03 Shuttle valve jamming, causing pressure control failure (pressure drifted from 28MPa to 21MPa)
Load Data: Working pressure 28MPa, vibration 4.0 mm/s RMS, ambient temperature 34°C, seawater salinity 37‰, air flow rate 130L/min
Repair Measures: Replaced the jammed shuttle valve with our 226QMD-03 Shuttle valve, cleaned the valve body, and lubricated internal components
Repair Effect: Valve operates smoothly, pressure stabilized at 28MPa, response time ≤0.25s, no jamming after 2000 hours
Customer Feedback: "The new shuttle valve fixed our pressure control issue completely. It’s corrosion-resistant in the offshore environment and handles vibration perfectly. Installation was quick, and it’s been reliable ever since—we highly recommend it."

Case 3

Location: Sichuan Oilfield, Sichuan Province, China
Equipment Model: QYB35-175L Pneumatic Hydraulic Pump (25MPa)
Fault: QB6-09 V-type sealing ring wear, leading to hydraulic fluid leakage (pressure dropped from 25MPa to 18MPa)
Load Data: Working pressure 25MPa, vibration 3.8 mm/s RMS, ambient temperature 42°C, H₂S concentration 930ppm, fluid flow rate 68L/min
Repair Measures: Replaced the worn V-type sealing ring with our QB6-09 V-type sealing ring, cleaned the seal groove, and conducted a pressure test
Repair Effect: No leakage, pressure restored to 25MPa, stable operation for 2100 hours
Customer Feedback: "The new V-type sealing ring eliminated our leakage problem. It’s resistant to sour gas corrosion and doesn’t wear easily—critical for our shale gas operations. It’s much more reliable than the original part."

Case 4

Location: Middle East Oilfield, Saudi Arabia
Equipment Model: 226QMD Series Pneumatic Hydraulic Pump (22MPa)
Fault: QM19-25 Stud Bolts loosening, leading to cylinder head separation and pump shutdown
Load Data: Working pressure 22MPa, vibration 4.2 mm/s RMS, ambient temperature 50°C, hydraulic oil temperature 68°C
Repair Measures: Replaced the loosened studs with our QM19-25 Stud Bolts, tightened to 200 N·m, and inspected other fasteners
Repair Effect: Cylinder head secured tightly, no loosening after 1800 hours, pump operates stably
Customer Feedback: "The new stud bolts solved our loosening problem completely. They handle the extreme heat and vibration of our desert oilfield perfectly and have kept our pump running without issues. We’ll be ordering these studs for all our 226QMD pumps."

FAQ (Frequently Asked Questions)

Procurement Guide and Technical Reference Standards

Procurement Reference Standards

When purchasing these QYB35-175L and 226QMD series parts, refer to the following standards to ensure quality, compatibility, and safety: 1. API 6A (21st Edition) for high-pressure wellhead and tree equipment parts; 2. API 16A (4th Edition) for well control equipment parts; 3. GB/T 31033-2025 and GB/T 20174-2019 for petroleum drilling well control requirements; 4. ISO 9001:2015 quality management system certification; 5. ASME B16.34 certification for pressure-containing components. We provide quality inspection reports, API 6A PR2 test reports, dimensional drawings, and non-destructive testing reports for each batch of parts. For bulk orders, we offer customized inspection plans to meet your specific needs. Always confirm your equipment model (QYB35-175L, 226QMD) and part number to avoid mismatches—provide the equipment serial number for verification, and we will ensure the parts fit perfectly, ensuring seamless compatibility with your existing systems.

Technical Problem Reference Standards

For common technical issues (pump leakage, shuttle valve jamming, plunger rod wear, stud bolt loosening), follow these solutions (aligned with API 6A, API 16A, GB/T 31033-2025, and industry best practices): 1. Leakage: Replace with our 226QMD-21 50×3.1 O-rings or QB6-09 V-type sealing rings, clean the affected components, and conduct pressure tests per API 6A PR2 standards; 2. Shuttle valve jamming: Replace the 226QMD-03 Shuttle valve, clean the valve body, and lubricate internal components; 3. Plunger rod wear: Replace the QYB35-175L plunger rod, clean the pump body, and calibrate flow rate; 4. Stud bolt loosening: Replace with QM19-25 Stud Bolts and tighten to the specified torque. Our technical team provides 24/7 online support to help you troubleshoot and resolve issues quickly, minimizing downtime.

Procurement Guidance

If you need QYB35-175L pneumatic hydraulic pump parts, 226QMD series pump components, QB6 series auxiliary parts, or any other listed replacement parts for oilfield pneumatic hydraulic systems, contact us directly. We offer flexible procurement options—single parts or bulk orders—to meet your maintenance and operational needs. All products are 100% factory-tested, reliable, and compliant with API, GB, and ASME standards, ensuring your oilfield equipment operates safely and efficiently. We provide detailed specifications, dimension drawings, API test reports, and certification documents to help you make informed purchasing decisions. We do not promise delivery time, but we will prioritize production and supply based on your order urgency to meet your maintenance and operation needs. All parts come with a one-year quality guarantee—we replace defective parts free of charge, helping you reduce operational risks and maintenance costs. Whether you need a single replacement part for an urgent repair or a full set of spare parts for your QYB35-175L and 226QMD pump fleet, we have the expertise and supply capacity to support you, ensuring your oilfield operations remain continuous and safe.

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