Inline Gate Valve Seat Repair
Using specialized equipment and proven welding procedures, we replace damaged seats and restore sealing surfaces directly in the field, reducing downtime and avoiding costly valve replacement.
Gate Valve Seat Repair Overview
Gate valve seats can fail due to erosion, thermal stress, or weld defects, leading to leakage and loss of isolation. In many cases, replacing the entire valve is costly, time-consuming, or not feasible within outage timelines.
JS provides a solution by removing and replacing seats in-place, restoring the valve using updated materials and welding techniques.
Common Seat Failures Include:
- De-lamination or disbonding of Stellite overlay
- Radial cracking of hardfacing
- Cracked seat-to-body welds
- Damage from foreign material or valve malfunction
Advantages of Repair over replacement
Reduce Downtime
Perform repairs in place without removing the valve from the system.
Avoid Long Lead Times
New valves may not be available for weeks or months, repair keeps your outage on schedule.
Improve Reliability
Updated welding procedures and materials improve performance compared to older valve designs.
Lower Total Cost
Repairing large, high-value valves is often significantly more economical than full replacement.
The Repair Process
Seat Removal
Damaged seats are removed using a proprietary grinding process that allows for precise weld removal and efficient extraction.
Surface Preparation
The valve body is cleaned and prepared to remove scale and contaminants, ensuring proper weld integrity.
Orbital TIG Welding
New seats are installed using automated orbital TIG welding systems, allowing for consistent, high-quality welds in difficult-to-access areas.
Heat Treatment
Preheat and post-weld heat treatment are performed in-house to maintain material integrity and avoid damage.
Inspection & Verification
Welds and sealing surfaces are inspected using NDE methods to ensure quality and performance.
Capabilities & Applications
JS performs inline gate valve seat replacement across a wide range of valve sizes, brands, and materials in demanding service environments.
Core capabilities include:
- Removal and replacement of gate valve seats in-line
- Stellite and alloy weld overlay for sealing surfaces
- Precision grinding and surface preparation
- In-field welding using orbital TIG equipment
- In-house preheat and post-weld heat treatment
Supported valves include: gate valves used in power generation, refining, and other high-temperature or high-pressure applications.
This service is commonly used during turnarounds, outages, and emergency repairs where valve removal is not practical.
Documentation & Quality Assurance
JS Machine & Valve ensures every inline gate valve seat repair is fully documented and verified to support traceability, quality control, and long-term reliability.
Quality assurance and inspection include:
- Dye penetrant inspection (NDE)
- Hardness testing
- PMI (Positive Material Identification)
- Pre- and post-weld heat treatment monitoring
Documentation provided includes:
- Repair records and welding procedures
- Inspection and NDE reports
- Material verification data
- Final repair documentation
This process ensures each valve is repaired to required standards and supported by complete, verifiable records.
Why JS Machine & Valve
JS combines field experience, specialized equipment, and certified processes to deliver reliable inline valve repairs.
- Over 15 years of gate valve seat replacement experience
- OEM authorizations across major valve manufacturers
- ASME “R” Stamp certified welding (shop and field)
- Certified NDE and inspection personnel
- In-house heat treatment for process control
- Nationwide field service capability
CALL US
417-825-3354
LOCATION
20583 US Highway 169
Nowata, OK 74048
BUSINESS HOURS
M-F : 8:00am to 5:00pm
