6 Inch Full Bore Soft Seat Gearbox Duplex SS Ball Valve

Product Overview

Our 6 Inch Full Bore Soft Seat Gearbox Duplex SS Ball Valve is engineered for demanding industrial applications where reliable shut-off, superior corrosion resistance and ease of actuation are essential. The valve features a full-bore design to minimise flow resistance and ensure maximum throughput, a soft (thermoplastic) seat for bubble-tight sealing, duplex stainless steel body and trim for outstanding strength and corrosion performance, and a gearbox operator for smooth, low-torque manual actuation (or option for actuator mounting).

Product Specifications

Applicable Standards:
Ball  Valve design according to API6D,BS5351,ASME B16.34
Face to face ASME B16.10,AP6D
End Flanges ASME B16.5/ASME B16.47
Butt welded ends ASME B16.25
Fire Safety API607,API6A
Inspection and test API 598,API6D

Material: F51
Size Range: 2"~48"
Pressure Rating: ASME CL, 150, 300, 600

Design Description:
- Structure : 2 pieces or 3 pieces body
- High shut-off sealing mechanism and low torque operation
- Block and bleed function
- Self-cavity pressure relief
- Fire safe design
- Blow out proof stem construction
- Anti-static design
- Locking device (for lever handle operation)
- ISO 5211 actuator mounting
- Emergency grease injection (option)
- PN design can be available

Key Features

• Size & Flow: 6 inch bore (full port), enabling unrestricted flow and minimal pressure drop in pipeline systems.

• Soft Seat Construction: The use of soft seat material (such as PTFE or equivalent) enables an excellent leak-tight seal by conforming closely to the ball surface — ideal for clean fluids and moderate temperature services. 

• Duplex Stainless Steel Body & Trim: Duplex stainless steel offers a balanced austenite-ferrite microstructure, delivering both high mechanical strength and enhanced corrosion resistance (including resistance to stress corrosion cracking in chloride environments).

• Gearbox Actuation: The worm-gear gearbox operator provides mechanical advantage for manual operation in large size valves, enabling smooth open/close operation with lower effort and improved safety.

• Flanged End Connections: Standard flanged ends allow robust bolted connection to pipeline flanges, suitable for high-pressure systems.

• Full Bore Design: A full-bore (full-port) configuration means the internal diameter matches the pipeline, avoiding internal constrictions and making it suitable for pigging or high-flow applications.

• Bubble-Tight Shutoff: The soft seat combined with precision ball-seat machining provides bubble-tight shut-off performance, reducing leakage risk and ensuring reliable isolation.
  
  
  

Frequently Asked Questions 

Q1: What does “soft seat” mean and when is it appropriate?
A: A soft-seat ball valve uses a polymeric or thermoplastic seat (for example PTFE) that presses against the ball surface to achieve a near leak-free seal. Soft seats excel for clean fluids, moderate temperatures, and when a bubble-tight shutoff is required. They may have limitations in extreme temperatures, abrasive media or highly erosive environments, in which case a metal-seat valve may be more suitable.

Q2: What are the benefits of using duplex stainless steel vs. standard stainless steel?
A: Duplex stainless steels combine the toughness and weldability of austenitic stainless steel with the high yield and strength of ferritic stainless steel. They offer superior mechanical strength, better resistance to chloride-induced stress corrosion cracking and improved lifecycle performance in demanding environments.

Q3: What service conditions is this valve designed for?
A: This valve is designed for standard to demanding industrial services: full bore for high-flow lines, flanged connections for high-pressure systems, gear-actuation suitable for manual operation of large valves, and materials engineered to resist corrosive and high-stress environments. Specific temperature/pressure ratings should be confirmed based on materials, seat rating, actuator torque and end-connection class.

Q4: What are the advantages of a gearbox operator on a ball valve?
A: For larger size ball valves (e.g., 6 inch and up) the operating torque may become significant. A gearbox operator provides mechanical advantage, enabling smoother and safer manual operation, reducing operating effort, and often allowing optional remote or actuator mounting. Gear-drive also helps maintain precise control during opening/closing, which can improve seat life and reduce wear.

Q5: How do I install and maintain the valve to ensure optimum performance?
A: - Ensure correct flange alignment and bolt torque per standard (e.g., ANSI B16.5) to avoid flange stress.