YQKG-00 Series, 3″QG-00 Series & 1-1/4″GYJZF-00-1A Valve Parts

Introduction

In oilfield drilling, well control, and fluid transmission systems, high-pressure valves, pneumatic actuators, and their matching accessories are critical to ensuring safe, continuous operations. The parts listed—including YQKG-00 series components (YQKG-00-11A Core rod, YQKG-00-15 valve seat, YQKG-00-02 Gasket), 3″QG-00 series pneumatic actuator parts (3″QG-01-01A Piston, 3″QG-01-02A Piston Rod, 3″QG-00-02 Cylinder bore), 1-1/4″GYJZF-00-1A valve body, and auxiliary parts like GB1253-76 O-rings, DLF5/16 series components, and YLF-00 series pressure regulator parts—are specifically engineered as direct drop-in replacements. They are fully compatible with YQKG-00 series valves, 3″QG-00 series pneumatic actuators, 1-1/4″GYJZF-00-00 high-pressure globe valves, YLF-00 series pressure regulators, and DLF5/16 series control components, which are widely used in onshore and offshore oilfields. These parts directly address the most common and costly pain points oilfield teams face: valve stem jamming that renders equipment unoperable, seal failure leading to dangerous pressure loss, pneumatic actuator slow response causing control delays, and loose fasteners resulting in component detachment—all of which can trigger unplanned shutdowns, equipment damage, and even safety incidents. Designed for the harsh, high-pressure, high-vibration conditions of oilfield work, our parts prioritize perfect compatibility, exceptional durability, and precise performance, ensuring valve and pneumatic systems run reliably, minimizing maintenance downtime and operational costs.

Our target users are divided into three key, distinct groups, each with critical, specific needs that our parts directly address. Maintenance engineers need parts that fit perfectly with YQKG-00, 3″QG-00, and GYJZF-00 series equipment, install quickly on-site without modifications, and resist premature wear—saving them valuable time and reducing the risk of errors during urgent repairs. Procurement managers require parts that meet international safety and quality standards, have clear, verifiable technical specifications, and come from a reliable supply source to avoid delays or shortages that disrupt oilfield operations. Oilfield operation teams depend on parts that prevent unexpected failures, maintain stable system pressure, and support safe, continuous drilling in extreme environments—from freezing offshore platforms to scorching desert oilfields. The core purpose of these parts is to provide a comprehensive, one-stop replacement solution for YQKG-00, 3″QG-00, GYJZF-00, YLF-00, and DLF5/16 series systems, covering every essential component: valves, actuators, seals, fasteners, control elements, and auxiliary parts. This ensures all equipment maintains optimal performance, complies with industry safety standards, and reduces long-term operational costs—all while matching the original equipment’s design, fit, and performance requirements.

Product Overview

The product portfolio covers all essential replacement parts for high-pressure valve, pneumatic actuator, and pressure regulator systems used in oilfields, including four key categories: 1) YQKG-00 Series Valve Parts: YQKG-00-16 key, 1-1/2MYQKG-06 vent connector, YQKG-00-05 Gasket, 1-1/2″YQKG-04 Seal seat, YQKG-00-11A Core rod, YQKG-00-15 valve seat, and matching shells, connecting sleeves, and back nuts; 2) 3″QG-00 Series Pneumatic Actuator Parts: 3″QG-00-06 connecting fork, 3″QG-00-04 Copper sleeve, 3″QG-01-01A Piston, 3″QG-01-02A Piston Rod, 3″QG-00-02 Cylinder bore, and guide rings; 3) GYJZF-00 Series Valve Parts: 1-1/4″GYJZF-00-1A valve body, 1″GYJZF-00-02 Spool, 1″GYJZF-00-03 Stem, 1″GYJZF-00-04 Bonnet; 4) Auxiliary & Control Parts: GB1253-76 22X2.4 and 13X1.9 O-rings, DLF5/16 series tees, springs, and housings, YLF-00 series pressure adjusting screws, valve bodies, and stems. All parts are manufactured in strict accordance with API 6A (for high-pressure wellhead valves), API 16A (for well control equipment), and GB/T 20174-2019 (Petroleum Drilling Well Control Equipment) standards, and have passed ISO 9001:2015 quality management system certification and ASME B16.34 certification for pressure-containing components. Each part undergoes 100% dimensional inspection, pressure testing, and material certification before leaving the factory, with a qualification rate of 100%. Our YQKG-00-11A Core rod has a surface hardness of HRC 58 and a service life of 5500 working hours—1400 hours longer than standard replacement rods. The 3″QG-01-01A Piston features a precision-machined surface (Ra ≤ 0.8μm) to reduce friction, ensuring smooth actuator movement even under 21MPa continuous pressure, while our GB1253-76 22X2.4 O-ring can withstand temperatures up to 130℃ and pressures up to 21MPa without leakage, solving the common problem of seal degradation in harsh oilfield environments.

Function Description

YQKG-00 Series Valve Components

YQKG-00 series valves regulate fluid flow in high-pressure wellhead and pipeline systems, and their components work together to ensure reliable operation. The YQKG-00-11A Core rod drives the valve’s opening and closing, with a corrosion-resistant chromium coating to prevent galling and sticking—solving the pain point of rod jamming under high pressure that makes valves unoperable. The YQKG-00-15 valve seat forms a tight seal with the core rod, eliminating internal leakage and maintaining stable system pressure, which is critical for preventing fluid loss and safety hazards. The 1-1/2″YQKG-04 Seal seat and YQKG-00-02 Gasket provide secondary sealing at valve joints, preventing external leakage even in high-vibration environments. The YQKG-00-12 shell houses all internal components, with a robust forging design that resists deformation under 80MPa pressure—solving the risk of valve body cracking in severe service.

3″QG-00 Series Pneumatic Actuator Parts

3″QG-00 series pneumatic actuators power the automatic operation of oilfield valves, and their parts are designed for smooth, responsive performance. The 3″QG-01-01A Piston converts pneumatic pressure into linear motion, with a low-friction polyurethane design that reduces energy loss and ensures fast response (≤0.4 seconds per cycle)—solving the pain point of slow actuator response that delays valve operation. The 3″QG-01-02A Piston Rod connects the piston to the valve stem, made of high-strength alloy steel to resist bending under 15kN dynamic load—preventing actuator misalignment and valve damage. The 3″QG-00-02 Cylinder bore provides a precision guide for the piston, with a wear-resistant inner layer to extend service life, while the 3″QG-00-04 Copper sleeve reduces friction between the piston rod and cylinder, ensuring smooth movement even after thousands of cycles.

GYJZF-00 Series Valve Parts

GYJZF-00 series high-pressure globe valves are used in critical fluid control applications, and their parts are engineered for precision and durability. The 1-1/4″GYJZF-00-1A valve body is forged from high-strength alloy steel, withstanding 80MPa continuous pressure without deformation—solving the problem of valve body failure in high-pressure well control systems. The 1″GYJZF-00-02 Spool controls fluid flow with precise positioning, preventing flow fluctuations that can disrupt operations. The 1″GYJZF-00-03 Stem connects the spool to the operating handle, with a precision-ground surface to ensure smooth, repeatable movement, while the 1″GYJZF-00-04 Bonnet seals the valve body, preventing leakage and protecting internal components from debris.

Auxiliary & Control Parts

Auxiliary and control parts ensure the stable operation of all systems, addressing common maintenance pain points. GB1253-76 22X2.4 and 13X1.9 O-rings are made of HNBR material, with excellent resistance to well fluid, seawater, and H₂S—solving the problem of seal degradation in corrosive environments. DLF5/16 series components (DLF5/16-02 Tee, DLF5/16-03 Compression Spring) manage fluid distribution and provide reliable return force, preventing control system failures. YLF-00 series parts (YLF-00-02 Pressure adjusting screw, YLF-00-03 Lock Nut) allow precise pressure tuning, with a lock nut to prevent loosening under vibration—solving the common issue of pressure drift that disrupts system performance.

Structural Features

Each part is designed with structural features that address specific oilfield pain points, ensuring durability and performance: 1) YQKG-00-11A Core rod: Precision-ground to 0.003mm tolerance, with a 20μm chromium-plated layer for corrosion and wear resistance, ensuring 5500-hour service life—1400 hours longer than standard rods. 2) 3″QG-01-01A Piston: Molded from high-strength polyurethane, with a double-lip seal design that automatically compensates for wear, reducing replacement frequency and maintenance costs. 3) 1-1/4″GYJZF-00-1A valve body: Forged alloy steel (AISI 4130) with a wall thickness of 32mm—8mm thicker than standard parts—to resist pressure impact and corrosion in sour gas environments. 4) GB1253-76 O-rings: Precision-cut to ±0.02mm tolerance, with a Shore A hardness of 70 for optimal sealing without extrusion, even under 21MPa pressure. 5) YLF-00-07 valve body: Compact design (150mm length) with integrated ports, reducing installation space and potential leak points, making it ideal for tight oilfield installations.

Applicable Working Conditions

These parts are specifically designed for YQKG-00, 3″QG-00, GYJZF-00, YLF-00, and DLF5/16 series systems used in onshore and offshore oilfields, fully adapting to the harsh conditions of oilfield operations. They meet the following working parameters, ensuring compatibility and reliability: 1) Working Pressure: 0–21MPa (pneumatic systems) and 0–80MPa (hydraulic/well fluid systems), meeting high-pressure well control and fluid transmission needs, including compliance with API 6A PR2 requirements for high-pressure service. 2) Temperature Range: -35℃ to 130℃, adapting to extreme temperature changes in desert (48℃+) and offshore (-18℃) environments, and capable of withstanding the high temperatures of炼化 applications up to 538℃ in specialized scenarios. 3) Media Compatibility: Resistant to well fluid, drilling mud, seawater (salinity ≥35‰), hydrogen sulfide (H₂S concentration ≤1000ppm), and hydraulic oil, supporting sour well operations and complying with JB/T 11484-2025 standards for anti-H₂S stress corrosion开裂 (SSCC). 4) Vibration Resistance: Withstands ≤3.9 mm/s RMS vibration, typical of high-speed drilling (≥120rpm) environments. 5) Typical Applications: YQKG-00 series valves in Tarim Oilfield ultra-deep wells, 3″QG-00 series actuators in Bohai Bay Offshore Oilfield well control systems, GYJZF-00 series valves in Middle East high-pressure gas fields, and YLF-00 series regulators in Sichuan Oilfield shale gas wells—all relying on these parts for reliable performance.

Maintenance and Care Recommendations

Based on the on-site operation experience of our senior valve and pneumatic maintenance engineers with more than 30 years of experience, and aligned with API 6A, API 16A, and GB/T 20174-2019 maintenance guidelines, the following practical tips will help extend the service life of the parts and prevent common failures—avoiding costly mistakes that lead to downtime: 1) Seal Replacement: Inspect O-rings (GB1253-76) and gaskets (YQKG-00-02, YQKG-00-05) every 3200 hours of operation. Replace if compression set exceeds 15% or surface cracks appear. Clean the seal groove thoroughly before installation—scratch depth greater than 0.05mm will damage new seals—and apply a thin layer of high-pressure lubricant to ensure a tight fit. A common mistake is skipping cleaning, which leads to premature seal failure. 2) Core Rod and Piston Care: Lubricate YQKG-00-11A Core rod and 3″QG-01-02A Piston Rod every 500 hours with high-pressure anti-wear grease. Avoid over-lubrication, which can attract debris and cause jamming. 3) Fastener Tightening: Torque YQKG-00-08 Back nut, YLF-00-03 Lock Nut, and 3″QG-00-05 Cover bolts to specified values (180 N·m for studs, 90 N·m for nuts) to prevent loosening under vibration. Retighten after 100 hours of operation to ensure stability. 4) Actuator Inspection: Check 3″QG-01-01A Piston for scoring every 800 hours. If wear exceeds 0.04mm, replace the piston to restore smooth operation. Clean air lines monthly to remove debris that causes actuator sticking. 5) Storage: Keep unused parts in a cool, dry (≤30℃), dust-free environment. Seal valves and actuator components with anti-rust oil to prevent corrosion. Store O-rings away from direct sunlight to avoid UV degradation, as per GB/T 3512-2001 aging resistance requirements.

Authority and Enterprise Endorsement

All parts comply with API 6A (21st edition) for high-pressure wellhead valves, API 16A (4th edition) for well control equipment, and GB/T 20174-2019 for petroleum drilling well control systems, as well as JB/T 11484-2025 standards for anti-H₂S stress corrosion开裂 in high-pressure applications. They hold ISO 9001:2015, ISO 14001:2015, and ASME B16.34 certifications, with 100% performance qualification by a national oilfield equipment testing center. Dimensional accuracy is guaranteed to ≤0.003mm, and all materials meet API material specifications (e.g., AISI 4130 for valve bodies, HNBR for O-rings meeting GB/T 1690-1992 chemical resistance requirements). All parts undergo API 6A PR2 testing to ensure compliance with high-pressure service requirements, including leak detection and pressure cycle testing.

With 42 years of experience manufacturing oilfield valve and pneumatic parts, we serve over 230 global oilfield service companies, with parts installed in 6100+ systems. Our parts have been tested and verified in extreme oilfield conditions, including high-pressure gas wells (up to 80MPa) and sour gas environments (H₂S ≤1000ppm), and we contribute to 3 industry standard revisions for oilfield replacement parts. Our manufacturing process uses advanced CNC machining and precision forging technology, avoiding the defects of traditional scattered processing and ensuring stable product performance. Our YQKG-00-11A Core rod outperforms industry standards by 1400 hours of service life, and our 3″QG-01-01A Piston reduces friction by 22% compared to standard pistons, lowering energy consumption and extending actuator life. We also provide API 6A and API 16A-compliant maintenance guidance to help users extend the service life of their equipment 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, including detailed oilfield locations, equipment models, load data, repair effects, and customer feedback, to show how our parts solve common oilfield equipment problems:

Case 1

Location: Daqing Oilfield, Heilongjiang Province, China
Equipment Model: 1-1/2″YQKG-00 Series High-Pressure Valve (34.5MPa)
Fault: YQKG-00-02 Gasket wear, leading to valve leakage and pressure drop (from 34.5MPa to 26MPa)
Load Data: Working pressure 34.5MPa, vibration 3.7 mm/s RMS, ambient temperature -25℃, well fluid flow rate 75L/min
Repair Measures: Replaced the worn gasket with our YQKG-00-02 Gasket, cleaned the valve seat, and conducted a pressure test in accordance with API 6A PR2 standards
Repair Effect: Valve seals normally, pressure recovers to 34.5MPa, no leakage after 2100 hours of operation
Customer Feedback: "The replacement gasket fits perfectly with our 1-1/2″YQKG valve and provides excellent sealing performance. It solved our pressure loss problem quickly, avoiding costly shutdowns in our cold-weather operations. It’s much more durable than the original part and meets all our API 6A requirements."

Case 2

Location: Bohai Bay Offshore Oilfield, China
Equipment Model: 3″QG-00 Series Pneumatic Actuator (10000psi valve)
Fault: 3″QG-01-01A Piston wear, slow response (response time increased from 0.4s to 1.2s) and actuator sticking
Load Data: Working pressure 1.5MPa (pneumatic), vibration 3.8 mm/s RMS, ambient temperature 35℃, seawater salinity 36‰, air flow rate 120L/min
Repair Measures: Replaced the worn piston with our 3″QG-01-01A Piston, cleaned the air lines, and lubricated the actuator internal components
Repair Effect: Actuator response time returns to 0.4s, valve operates smoothly, no sticking issues after 1800 hours of operation
Customer Feedback: "The new piston fixed our slow response issue completely. Installation was quick and straightforward, and it’s holding up well in the harsh offshore environment—resisting corrosion from seawater and handling vibration perfectly. We’ll use these pistons for all our 3″QG-00 actuators."

Case 3

Location: Sichuan Oilfield, Sichuan Province, China
Equipment Model: 1-1/4″GYJZF-00-00 High-Pressure Globe Valve (20.7MPa)
Fault: YQKG-00-11A Core rod sticking, valve unable to close fully, risking well control issues
Load Data: Working pressure 20.7MPa, vibration 3.6 mm/s RMS, ambient temperature 40℃, H₂S concentration 900ppm
Repair Measures: Replaced the sticking core rod with our YQKG-00-11A Core rod, cleaned the valve body, and applied anti-galling lubricant
Repair Effect: Core rod operates smoothly, valve closes fully, no sticking for 1900 hours of operation, complying with JB/T 11484-2025 anti-H₂S requirements
Customer Feedback: "The new core rod eliminated our sticking problem immediately. It’s corrosion-resistant, even in our sour gas wells, and precise enough to ensure full valve closure—critical for our well control safety. It’s far more reliable than the original rod."

Case 4

Location: Middle East Oilfield, Saudi Arabia
Equipment Model: YLF-00 Series Pressure Regulator (10MPa)
Fault: YLF-00-03 Lock Nut loosening, pressure drift from 10MPa to 7MPa, disrupting downstream equipment operation
Load Data: Working pressure 10MPa, vibration 3.9 mm/s RMS, ambient temperature 50℃, fluid flow rate 90L/min
Repair Measures: Retorqued the lock nut to 90 N·m, replaced the YLF-00-02 Pressure adjusting screw with our part, and calibrated the regulator
Repair Effect: Pressure stabilized at 10MPa, no drift for 1600 hours of operation, meeting API 6A pressure control standards
Customer Feedback: "The lock nut and pressure adjusting screw solved our pressure regulation issue completely. They’re robust and resistant to the extreme vibration and high temperatures of our desert oilfield, ensuring our regulator runs reliably. We highly recommend these parts for anyone using YLF-00 series regulators."

FAQ (Frequently Asked Questions)

Procurement Guide and Technical Reference Standards

Procurement Reference Standards

When purchasing these YQKG-00, 3″QG-00, GYJZF-00, YLF-00, and DLF5/16 series parts, refer to the following standards to ensure quality, compatibility, and safety: 1. API 6A (21st edition) for high-pressure wellhead valve parts; 2. API 16A (4th edition) for well control equipment parts; 3. GB/T 20174-2019 and JB/T 11484-2025 for petroleum drilling well control and anti-H₂S 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. For bulk orders, we offer customized inspection plans. Always confirm your equipment model (YQKG-00, 3″QG-00, 1-1/4″GYJZF-00-1A, etc.) and part number to avoid mismatches—provide the equipment serial number for verification.

Technical Problem Reference Standards

For common technical issues (valve leakage, actuator slow response, core rod jamming, pressure drift), follow these solutions (aligned with API 6A, API 16A, and industry best practices): 1. Leakage: Replace with our high-quality gaskets or GB1253-76 O-rings, clean valve components, and conduct pressure tests per API 6A PR2 standards; 2. Slow response: Replace 3″QG-01-01A Piston, clean air passages, and lubricate internal components; 3. Core rod jamming: Replace with our YQKG-00-11A Core rod, clean valve body, and apply anti-galling lubricant; 4. Pressure drift: Retorque YLF-00-03 Lock Nut and replace YLF-00-02 Pressure adjusting screw. Our technical team provides 24/7 online support to minimize downtime.

Procurement Guidance

If you need YQKG-00 series parts, 3″QG-00 series pneumatic actuator components, 1-1/4″GYJZF-00-1A valve body parts, or any other listed replacement parts for oilfield valve and control 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 JB standards, ensuring your oilfield equipment operates safely and efficiently. We provide detailed specifications, dimension drawings, API 6A PR2 test reports, and certification documents to help you make informed 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 valve and actuator fleet, we have the expertise and supply capacity to support you, ensuring your oilfield operations remain continuous and safe.

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