Through Conduit Expanding Gate Valves
Heavy-duty full-bore “through-conduit” expanding gate valve designed for large-bore, high-flow, high-pressure and high-temperature applications — suitable for pipelines, FPSOs, pig traps, and more.
The Through Conduit Expanding Gate Valve is a robust, metal-seated gate valve engineered to deliver reliable shut-off and minimal flow disruption in demanding applications. Its full-bore, through-conduit design ensures unrestricted passage of media, making it ideal for pigging operations or high-flow pipelines.
It offers bi-directional sealing, redundant stem sealing, and options for single or double expanding configurations for enhanced security and sealing integrity. Built with forged or cast bodies and constructed from carbon steel, stainless steel, duplex alloys, and nickel-based super-alloys, this valve is suitable for extreme pressure and temperature conditions. It supports manual, electric, hydraulic, and pneumatic actuation and is widely used in onshore/offshore oil & gas, transportation pipelines, FPSO systems, pig launchers/receivers, and heavy-duty industrial environments.
With in-line maintenance capability, a wide range of end connections, and compliance with major international standards, it delivers durability, safety, and versatile performance in critical flow control applications.
Main Features
- Forged or Cast Body and Bonnet
- Bi-Directional Sealing
- Full Bore
- Through Conduit
- Mechanical energized Metal Seated
- Rising Stem
- T shaped joint between gate and stem
- Local position indicator
- Multiple redundant sealing configuration on stem
- Static Sealing: Metallic
- Dynamic Sealing: Thermoplastic or Graphite (On stem)
- Anti static Device
- Anti blow‐out stem
- Fire Safe Design (API 607, API 6FA, ISO 10497)
- Single Expanding (closed position)
- Double Block and Bleed
- Seat Skirts
Options
- Customized size and design pressure according to Project requirements
- Reduced Bore
- Emergency Grease Injection points on stem
- Extended Stem
- Double Expanding
- Available Design Validation: API 6A PR2F, ISO 15848-1, API 6D
- Client specific Type Approval or Design Validation test
- PED
- ATEX
- Overlay Cladding on Sealing Areas or all wetted parts
- Flushing ports / devices for cavity and sealing area
- Seat debris contamination preventers and/or dedicated scraper rings for sliding areas
- Welded Pups / Transition pieces
- Painting according to Customer Specification
- By pass and or in-line bleeding system
Benefit
- Robust design
- Suitable for large bore, high flow applications
- High sealing capability
- Particularly recommended for High Pressure and High Temperature Services
- In-line maintenance
Technical Data
API 6D, API 6A, ISO 14313, ISO 10423
2”- 60”
Class: # 150-2500
1 13/16” – 21 ¼”
From RWP Form 13.8 MPa (2.000PSI) to RWP 103.5 MPa (15.000PSI)
-101°C ÷ 400°C
QSL 2, QSL3/3G, QSL4/4G
PSL-1, PSL-2, PSL-3, PSL-4
Main Components:
- Carbon steel
- Low temperature carbon steel
- Stainless austenitic steel and super-austenitic steel
- Stainless duplex and super-duplex
- Nickel superalloys (such as Monel, Inconel 625, Hastelloy)
NACE material available upon request Norsok material available upon request
Hard Facing (Metal Seated):
- Tungsten Carbide Coating
- Chrome Carbide Coating
- Handwheel / Manual gear
- Electric
- Hydraulic actuator (FAI)
- Pneumatic actuator (FAI)