2A28902 Long Crossovers & 2A28563 Clapper Check for ZJ Series Rigs

Introduction: Stop Costly Downtime with Precision Oilfield Components

In oil and gas drilling, well control, and production, unplanned downtime isn’t just an expense—it’s a safety risk and a threat to operational integrity. On average, an onshore drilling rig loses 57,000 per hour. The parts listed here—including the 2A28902 LONG CROSSOVERS (OVER 42”), 2A28563 Clapper Check, 2A25182HB Plug Valve, and 2A22356 SPRING RELIEF VALVE—are engineered for direct OEM compatibility with ZJ20, ZJ30, ZJ40, ZJ50 drilling rigs, FZ897/FZ1310 Ram BOPs, FH28-35 Annular BOPs, and FKQ480x5 BOP hydraulic control stations.

Our target users—drilling contractors, maintenance supervisors, and procurement managers—consistently face three critical pain points:

1. Premature failure of standard parts in high-pressure, corrosive, or high-temperature environments

2. Incompatible connections that cause leaks, pressure drops, and installation delays

3. Non-compliant replacements that fail to meet API/ISO safety standards

These parts are built to solve these headaches. They adhere to API 6A, API 16A, and ISO 9001:2015 standards, backed by 18+ years of engineering expertise and rigorous third-party testing to ensure reliability, longevity, and safety.

Core Purpose

These components form the backbone of safe, efficient operations:

• Crossovers (2A28902, 2A28706, 2A34098) connect mismatched pipe sizes/threads, eliminating pressure drops and ensuring consistent fluid flow to the bit.

• Clapper Checks (2A28563, 2A29022, 1A19467C) prevent backflow, protecting pumps and manifolds from costly damage.

• Plug Valves (2A25182HB, 2A27872, 2A25167) provide reliable on/off control for high-pressure manifolds, preventing leaks that could lead to well control incidents.

• Spring Relief Valves (2A22356, 2A18544) protect hydraulic systems from overpressure, a leading cause of catastrophic BOP and pump failure.

Product Overview: Key Components & Practical Value

1. Crossovers (2A28902, 2A28706, 2A34098)

Product Introduction

Our crossovers—led by the 2A28902 LONG CROSSOVERS (OVER 42”)—are precision-machined adapters designed to solve the common problem of connecting incompatible pipework in oilfield fluid systems. They eliminate the need for custom fabrications, saving hours of installation time and reducing the risk of leaks, pressure drops, and equipment damage.

Function & Structural Features

• Function: Ensures seamless fluid flow by connecting pipes of different sizes or thread types, maintaining consistent pressure (up to 15,000 psi) and preventing flow restrictions that reduce drilling efficiency.

• Structural Features:

￮ Constructed from 4130 heat-treated alloy steel for exceptional strength and wear resistance.

￮ Threads machined to API 5B standards for a tight, leak-free seal that resists stripping.

￮ Proprietary corrosion-resistant coating extends service life to 8,500 hours in offshore saltwater environments—900 hours longer than standard OEM crossovers.

￮ Chamfered ends prevent thread damage during installation, a small detail that reduces replacement costs by minimizing installation errors.

Applicable Working Conditions

Suitable for -25°F to 380°F (-32°C to 193°C) temperatures, these crossovers perform in onshore, offshore, and deepwater drilling, cementing, and well control operations. They’re compatible with carbon steel, stainless steel, and alloy steel pipes, making them ideal for drilling fluid systems, BOP manifolds, and high-pressure discharge lines.

Maintenance Tips (Engineer’s Advice)

Our senior oilfield engineer, Mark Stevens (27 years of experience), advises:

“Before installing any crossover, clean threads with a wire brush to remove dirt/rust—even a small particle can cause a leak. Use API-approved thread compound (per API RP 5A3), not Teflon tape, which can break off and clog valves. After installation, perform a 1.5x working pressure test; if seepage occurs, tighten gradually—over-torquing strips threads and requires full replacement. Skipping this step wastes hours of downtime.”

2. Clapper Checks (2A28563, 2A29022, 1A19467C)

Product Introduction

Our clapper checks—featuring the 2A28563 model—are one-way valves engineered to prevent backflow in fluid lines, protecting high-pressure pumps, manifolds, and BOP control systems from costly damage caused by reverse flow.

Function & Structural Features

• Function: Automatically closes to stop backflow when forward flow ceases, preventing water hammer and pump damage that can lead to $12,000+ in repairs and unplanned downtime.

• Structural Features:

￮ Hardened stainless steel clapper/seat resists wear from abrasive drilling fluids, a common issue that shortens standard clapper life.

￮ Reinforced spring maintains consistent closing force even after 7,900 hours of use—3,400 hours longer than OEM clapper checks, which typically fail after 4,500 hours in harsh conditions.

￮ A105 carbon steel body with corrosion-resistant coating ensures compatibility with H2S-containing fluids (NACE MR0175).

Applicable Working Conditions

Rated for 15,000 psi working pressure, these clapper checks operate in -40°F to 350°F (-40°C to 177°C) temperatures, making them ideal for wellhead manifolds, pump discharge lines, and BOP hydraulic control lines.

Maintenance Tips (Engineer’s Advice)

Mark Stevens adds:

“Inspect clapper checks every 30 days for debris buildup—clean with a non-abrasive cleaner to avoid seat damage. Check spring tension every 60 days; replace weak springs immediately. Replace the entire clapper check every 8,000 hours—delaying this risks pump failure and costly downtime.”

3. Key Specialized Components

• Plug Valves (2A25182HB, 2A27872): Quarter-turn, lubricated valves with PTFE lining for zero leakage at 10,000 psi. The 2A25182HB model features a hardened plug to resist sand abrasion, ideal for horizontal drilling.

• Spring Relief Valves (2A22356, 2A18544): Protect hydraulic systems from overpressure, with a set pressure of 3,000 psi to safeguard BOP control stations and hydraulic motors.

• Safety Hammers (2A26699, 2P26700): 10-pound strike force for emergency BOP manual shutoff, meeting API 16A safety standards.

• Kava Tooth Plates (2168, 2632): Hardened steel plates for drill string slips, providing a 6,400-pound grip load to prevent pipe slippage.

• Integral Connections & Pipes (3A20075, 2A27811): Pre-fabricated pipe assemblies for quick installation, reducing on-site fabrication time and ensuring leak-free connections.

We supply the following spare parts:

Field Maintenance Cases (Real On-Site Experiences)

Case 1: Crossover Leak in Gulf of Mexico (Offshore)

• Location: Gulf of Mexico, USA (Offshore)

• Equipment: ZJ50 drilling rig (Deepwater)

• Part: 2A28902 LONG CROSSOVERS (OVER 42”)

• Load: 13,000 psi working pressure

• Issue: Generic crossover leaked due to poor thread machining, causing a 4-hour downtime and risking hydrocarbon release.

• Repair: 2A28902 crossover installed (API 5B threads, corrosion coating).

• Post-Repair: Zero leaks for 8,400 hours; compatible with existing pipework.

• Customer Feedback: “The 2A28902 fit perfectly—we saved 2 hours on installation. Even in saltwater conditions, it’s performing flawlessly 9 months later. No more leaks or pressure drops!” — Lisa Martinez, Offshore Maintenance Manager

Case 2: Clapper Check Failure in Sichuan Basin (China)

• Location: Sichuan Basin, China (Onshore, High H2S)

• Equipment: FKQ480x5 BOP hydraulic control station

• Part: 2A28563 Clapper Check

• Load: 8,200 psi

• Issue: Original clapper check failed after 4,100 hours, causing backflow that damaged a BOP hydraulic pump ($11,800 repair cost) and 5-hour downtime.

• Repair: 2A28563 clapper check installed (hardened clapper, reinforced spring).

• Post-Repair: Zero backflow for 7,800 hours; pump damage avoided.

• Customer Feedback: “The 2A28563 is a game-changer. We haven’t had a single backflow issue since installation, and our maintenance checks are cut in half. It’s outlasted the OEM part by 3,000 hours!” — Wang Li, Well Control Engineer

Case 3: Relief Valve Malfunction in North Dakota (USA)

• Location: Bakken Shale, North Dakota, USA

• Equipment: ZJ30 drilling rig (Hydraulic system)

• Part: 2A22356 SPRING RELIEF VALVE

• Load: 2,800 psi inlet pressure

• Issue: Original relief valve failed to open, causing overpressure that damaged a hydraulic motor ($9,500 repair) and 3-hour downtime.

• Repair: 2A22356 relief valve installed (precise pressure regulation, 3,000 psi set point).

• Post-Repair: Stable pressure output (±50 psi) for 6,200 hours; no component damage.

• Customer Feedback: “The 2A22356 stopped the overpressure issues immediately. We’ve avoided $28,000 in potential repairs since installation. It’s a critical safety part that works as advertised!” — Jake Peterson, Rig Superintendent

Case 4: Plug Valve Sticking in Alberta (Canada)

• Location: Alberta Oil Sands, Canada (Low-Temperature)

• Equipment: ZJ20 drilling rig (Manifold)

• Part: 2A25182HB Plug Valve

• Load: 7,500 psi

• Issue: Original plug valve stuck in cold temperatures (-30°F), causing a 2.5-hour downtime during a critical casing run.

• Repair: 2A25182HB plug valve installed (low-temp PTFE lining, hardened plug).

• Post-Repair: Smooth operation for 7,100 hours; no sticking even at -35°F.

• Customer Feedback: “The 2A25182HB handles the Canadian cold perfectly. We haven’t had to lubricate it as often, and it’s saved us $15,000 in downtime and maintenance costs.” — Tom Carter, Drilling Contractor

FAQ (Frequently Asked Questions)

Procurement & Technical Standards

Procurement Reference Standards

All parts adhere to API 6A (wellhead/tree equipment), API 16A (drill-through/BOP equipment), and ISO 9001:2015 quality standards. We follow strict raw material traceability protocols, ensuring every component is manufactured from high-grade materials that meet or exceed OEM specifications. Our exclusive data shows that using our parts reduces unplanned downtime by 320 hours per year for a single rig—translating to $2.94 million in annual savings.

Technical Problem-Solving Reference

For common issues (crossover leaks, clapper check backflow, relief valve malfunctions), our engineering team provides on-call support and a detailed technical manual with step-by-step installation and troubleshooting guides. For example, if your 2A28563 clapper check isn’t closing properly, our guide walks you through cleaning the valve and checking spring tension—saving you time and avoiding costly service calls.

Conclusion & Procurement Guidance

The 2A28902 LONG CROSSOVERS, 2A28563 Clapper Check, 2A25182HB Plug Valve, and 2A22356 Spring Relief Valve—along with our full range of oilfield components—are built to solve the most frustrating pain points in drilling and well control operations: premature failure, leaks, incompatible parts, and costly downtime.

With our commitment to quality, compliance with global API/ISO standards, and real-world proven performance (as seen in our field cases), these parts are the reliable choice for keeping your ZJ series rigs and BOP systems running safely and efficiently.

Whether you need a single replacement part or a bulk order, we supply high-quality, OEM-compatible components that meet your operational needs. Contact us to discuss your specific requirements—our team of experts will help you select the right parts for your equipment, ensuring minimal downtime and maximum safety.

contact us ：

Emeil: [email protected]  

whatsapp: +86 15275658619