NOV Shaffer Proserv 25413 RK Repair Kit P/N 9910011

National Oilwell Varco Shaffer Proserv 25413 RK Repair Kit (P/N: 9910011)

The National Oilwell Varco (NOV) Shaffer / Proserv 25413 RK (Part Number: 9910011) is a high-pressure elastomer and soft-goods major rebuild kit engineered specifically for hydraulic shuttle valves and pilot-operated control modules utilized across subsea Blowout Preventer (BOP) control systems and surface hydraulic power units (HPUs).

Manufactured to meet stringent offshore drilling standards, this repair kit restores factory sealing integrity, eliminates hydraulic fluid bypass, and mitigates pilot-line pressure drops in critical well-control circuits. Each component in the 25413 RK kit is molded from high-durometer, explosive-decompression-resistant (AED) fluoroelastomers and precision-machined backup rings designed to withstand aggressive water-glycol hydraulic control fluids, high cyclic operational pressures, and severe temperature fluctuations.

Technical Specifications

Equipment Compatibility

The 25413 RK repair kit is directly compatible with the following offshore control systems and valve bodies:

• NOV / Shaffer BOP Control Systems: Multiplex (MUX) Subsea Control Pods, Hydraulic Direct-Pilot Stacks, and accumulator emergency dump circuits.
• Proserv Subsea & Surface Control Units: Proserv 1-inch and 3/4-inch hydraulic shuttle cushions, diverter control valves, and manifold isolation shuttle blocks.
• Gilmore / Hydril Equivalents: Compatible with Gilmore 1-inch shuttle assemblies using 25413/25426 series dynamic seat footprints.
• Drilling Rig Utility Systems: BOP skids, accumulator closing units (Koomey style), and subsea tree deployment control manifolds.

Key Features

1. Anti-Extrusion Engineering: Equipped with virgin/filled PTFE back-up rings that eliminate gap extrusion under 5,000 PSI high-frequency pulse switching.
2. Extended Dynamic Lifecycle: 90-durometer Viton/FKM compound reduces friction coefficients against 316SS/Inconel valve bores, minimizing stick-slip and shuttle wear.
3. Zero-Leakage Pilot Isolation: Precision-toleranced quad-rings and cross-sectional profile seals guarantee bubble-tight isolation between redundant hydraulic supply circuits.
4. Rapid Maintenance Pack: Complete single-service consumable kit containing all dynamic, static, and cushion seals required for a full valve overhaul without partial rebuild risk.
5. Chemical & Glycol Resistance: Formulated to resist swelling, embrittlement, and chemical breakdown in aggressive water-glycol hydraulic control fluids (Erifon HD603HP, Oceanic HW series, Castrol Brayco).

Industrial Applications

• Subsea BOP Multiplex (MUX) Control Pods: Primary hydraulic shuttle isolation between surface control and ROV/acoustic backup lines.
• Surface BOP Accumulator Skids: Manifold diverter and high-pressure pilot actuation line rebuilds.
• Offshore Production Wellhead Safety Systems: Emergency Shutdown (ESD) and Surface Safety Valve (SSV) hydraulic pilot manifold servicing.
• Workover & Well Intervention Risers: Hydraulic power transmission lines requiring high-reliability shuttle valve check systems.

Frequently Asked Questions

What components are included in the Proserv 25413 RK repair kit?

The 25413 RK kit contains all essential internal dynamic and static elastomeric components for a complete valve overhaul, including dynamic shuttle quad-rings, external sleeve O-rings, high-pressure PTFE anti-extrusion backup rings, and cushion stop seals.

How does the 25413 RK differ from standard commercial O-ring kits?

Standard O-rings lack the durometer ratings, explosive decompression resistance (AED), and tight dimensional tolerances required for high-pressure offshore subsea control systems. The 25413 RK utilizes specialized FKM/HNBR compounds formulated to withstand chemical aggression from water-glycol fluids under continuous 5,000 PSI cyclic loading.

Is Part Number 9910011 fully interchangeable with Gilmore 25413RK?

Yes. NOV Shaffer and Proserv shuttle cushion assemblies sharing the 25413 footprint match the dimensional and operational specifications of Gilmore 25413RK 1-inch shuttle rebuild kits. Always verify your valve assembly revision tag before installation.

What is the shelf life of the elastomeric seals in this kit?

When stored in original light-tight, sealed packaging in a climate-controlled environment (below 25°C / 77°F, away from ozone and UV light), the shelf life of these AED-grade fluorocarbon seals is up to 10 years from the cure date.