HengaoDe HYXJ Internal-Guided Safety Valve Seat & Disc Lapping Kit
| Brand | HengaoDe |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Authorized Distributor |
| Product Origin | Domestic (China) |
| Model | HYXJ |
| Pricing | Upon Request |
Overview
The HengaoDe HYXJ Internal-Guided Safety Valve Seat & Disc Lapping Kit is a precision-engineered mechanical maintenance solution designed for the in-situ restoration of sealing surfaces on industrial safety valves. Unlike conventional “valve-to-valve” lapping methods—which introduce angular deviation and compromise planarity—this kit implements a strict separation of disc and seat grinding operations using geometrically constrained, coaxially aligned tooling. Its core principle relies on internal guidance: each磨头 (seat lapping mandrel) features an integrated concentric pilot that engages the valve’s internal bore or stem guide, ensuring zero radial runout during rotation. This eliminates operator-induced tilt, enabling flatness tolerances within ≤0.5 µm across the entire sealing surface per ANSI/ASME B16.34 and API RP 576 compliance requirements. The system supports field repair without valve removal from piping, significantly reducing downtime and eliminating the need for costly replacement of pressure-retaining components.
Key Features
- Internal-guided architecture with self-centering pilot sleeves for repeatable axial alignment and elimination of edge chipping
- Dual-purpose lapping plate set: one 270 mm diameter tungsten carbide fine-grinding plate (Ra ≤ 0.05 µm finish) and one 300 mm diameter gray cast iron coarse-grinding plate (for rapid material removal)
- Nine standardized seat lapping mandrels covering nominal pipe sizes DN20–DN150 (per GB/T 1047–2019 / ISO 6708), with hardened steel construction and replaceable abrasive inserts
- Modular design enables adaptation to both spring-loaded and pilot-operated safety valves per ISO 4126-1 and PED 2014/68/EU
- Tooling surfaces are ground-flat and reference-calibrated; worn plates can be reconditioned on standard surface grinders without recalibration loss
- Compact, portable configuration suitable for confined-space valve maintenance in power plants, petrochemical facilities, and boiler systems
Sample Compatibility & Compliance
The HYXJ kit is validated for use with carbon steel, stainless steel (304/316), Inconel, and Monel safety valves rated up to Class 2500 (PN420). It accommodates both flat-seal and slightly conical (≤5° taper) seat geometries common in ASME Section I, Section VIII Div. 1, and EN 13445-compliant equipment. All components comply with ISO 9001:2015 manufacturing controls. The lapping process itself conforms to API RP 576 Annex A guidelines for seal surface qualification, supporting traceable maintenance records required under RBI (Risk-Based Inspection) frameworks and ISO 55001 asset management systems.
Software & Data Management
This is a purely mechanical, non-electronic tooling system—no embedded firmware, software, or digital interfaces are present. Maintenance logs—including valve ID, date, lapping cycles, surface finish verification (via stylus profilometer), and post-lap helium leak test results—must be recorded manually or integrated into existing CMMS platforms (e.g., SAP PM, IBM Maximo) via standardized work order templates. The kit includes a calibration certificate documenting initial flatness of grinding plates (measured per ISO 10791-7) and mandrel concentricity (≤0.02 mm TIR at 100 mm radius), valid for 24 months under normal usage conditions.
Applications
Primary applications include scheduled preventive maintenance of ASME-certified relief valves in thermal power generation, refinery flare systems, LNG terminal pressure protection circuits, and pharmaceutical steam sterilization autoclaves. Secondary use cases extend to gate, globe, and check valves where sealing integrity directly impacts process safety integrity level (SIL) performance. Field technicians routinely deploy the HYXJ kit during turnaround windows to restore valves to original OEM leakage class (e.g., ANSI/FCI 70-2 Class IV or V) without requiring machining shop intervention—reducing average repair time by 65% versus traditional bench lapping.
FAQ
Can the HYXJ kit be used on high-pressure hydrogen service valves?
Yes—provided valve body material is compatible with standard lapping compounds (e.g., aluminum oxide or silicon carbide slurries); mandrels are supplied with optional nickel-plated finish for enhanced corrosion resistance in H₂ environments.
Does the kit include lapping compound or abrasive pastes?
No—abrasives must be selected based on base metal hardness and desired finish; recommended compounds include 3 µm diamond paste for final polishing and 45 µm Al₂O₃ for stock removal.
What verification method confirms successful lapping?
Post-lap validation requires either blue dye contact pattern testing (≥90% uniform coverage per API RP 576 Fig. A.2) or quantitative helium leak testing per ASTM E499–20 (leak rate ≤ 1×10⁻⁶ std cm³/s).
Is operator training required before deployment?
Yes—HengaoDe provides a certified 4-hour hands-on workshop covering torque control, rotational speed limits (max 60 rpm), compound dilution ratios, and documentation standards aligned with ISO 17020 inspection body requirements.
How often should grinding plates be resurfaced?
Under typical plant maintenance loads (≤20 valves/month), carbide plates require regrinding every 18–24 months; cast iron plates every 6–9 months—verified by optical flat interferometry.
