Fig 602 Self-sealing Union (Double Check Valve Hammer Union, 6000 PSI)
In advanced well control and hydraulic manifold systems, preventing backflow while maintaining rapid assembly is crucial. Shanghai PME Industrial manufactures high-grade Fig 602 Self-sealing Union assemblies rated up to 6,000 PSI CWP. Widely recognized in the industry as a Double Check Valve Hammer Union, this specialized fitting fulfills strict API 16D operational requirements for hydraulic control systems, such as Koomey closing units.
Engineered to meet international quality standards equivalent to top-tier global oilfield equipment manufacturers, our Fig 602 self-sealing union features a precision-integrated check valve mechanism that automatically seals under reverse pressure gradients, safeguarding critical hydraulic circuits across active drilling and production fields in Indonesia, Malaysia, and broader Southeast Asia.
Overhead angle highlighting the precision-engineered self-sealing check valve mechanism.
Unassembled male sub, female sub, and heavy-duty three-lug nut components.
Complete 6000 PSI hammer union configuration ready for high-pressure manifold integration.
Technical Specifications & Sizing Chart
| Union Figure | Nominal Size Range | Cold Working Pressure (CWP) | Functional Designation | Design Standard |
|---|---|---|---|---|
| Fig 602 | 1″ | 6,000 PSI | Self-Sealing / Double Check Valve | API 16D / International Grade |
Application Analysis & Industry Benchmarking
The Fig 602 Self-sealing Union is engineered specifically for applications where fluid must flow freely in one direction while absolute protection against backflow is mandatory. Key deployment environments include:
1. API 16D Koomey Unit & BOP Control Manifolds
In blowout preventer (BOP) control systems, hydraulic accumulators (Koomey units) rely on secure line integrations. The double check valve configuration prevents high-pressure hydraulic fluid cross-contamination and maintains pressure isolation across control lines.
2. Global Standard Compatibility & Regional Deployment
Engineered from premium forged alloy steels matching ASTM/AISI standards, PME’s Fig 602 unions provide full dimensional and functional interchangeability with major international oilfield hardware brands. Featuring robust three-lug nuts, they allow rapid make-up and break-out on drilling spreads throughout Southeast Asia, including rigorous onshore and offshore blocks in Indonesia and Malaysia.