Twin Seal DBB Double Plug Valves
Engineered for mission-critical custody transfer metering, multi-product fuel manifolds, and aviation fuel storage. The TSV Twin Seal DBB plug valve utilizes dual mechanical expanding slips that retract completely from body seats before rotation, eliminating seat friction and providing verifiable double block and bleed in a single valve body.
Design Codes & Valve Construction Standards
Fully aligned with international engineering standards for refinery units, oil & gas transmission, and severe chemical isolation.
| Engineering Parameter | Standard Compliance & Material Execution |
|---|---|
| Design & Manufacture Standards | API 599, API 6D, ASME B16.34, BS 5353 |
| Face-to-Face & End-to-End | ASME B16.10, API 6D, EN 558 Series |
| Flanged & Butt-Weld Ends | ASME B16.5 (<=24"), ASME B16.47 Series A/B, ASME B16.25 (Butt Weld) |
| Pressure & Temperature Ratings | ASME B16.34 Class 150, 300, 600, 900, 1500, 2500 |
| Pressure Testing & Inspection | API 598, API 6D Rate A, ISO 5208, EN 12266-1 |
| Fire Safety Certification | API 607, ISO 10497 (Tested and Verified Construction) |
| Sour Service & Cracking Resistance | NACE MR0175 / ISO 15156, NACE MR0103 / ISO 17945 |
| Body Castings & Forgings | ASTM A216 WCB, A350 LF2, A351 CF8M, CF3M, Hastelloy C276, Monel 400 |
Twin Seal DBB Double Plug Valves Model Selection
Explore engineered configurations built for severe abrasion, extreme pressure drop, and critical chemical isolation.
API 6D Twin Seal DBB Custody Transfer Plug Valve
Verified double block and bleed isolation for pipeline fiscal metering skids, preventing costly cross-contamination between refined fuel batches.
Fuel Depot & Aviation Kerosene Double Block Isolation Plug
Engineered specifically for airport hydrant fueling and multi-product terminal tank manifolds with zero tolerant leak requirements.
Motorized Electric Actuated Pipeline DBB Plug Valve
Equipped with intelligent multi-turn electric actuator delivering synchronized slip retraction, 90-degree plug rotation, and reseating sequence.
Low-Temperature Clean Service DBB Plug Valve
Low-temperature carbon steel body engineered for sub-zero liquid hydrocarbons, LPG terminals, and cold climate pipeline manifolds.
Twin Seal Mechanical Retraction & DBB Principle
Why mechanical expanding slips deliver genuine zero-friction rotation and verifiable bubble-tight double block and bleed.
Mechanical Friction-Free Slip Retraction
Prior to rotation, the mechanical plug stem retracts both resilient slips inwards away from the body seats, completely eliminating seal rubbing and scoring.
True Verifiable Double Block & Bleed
Two independent resilient seated slips seal upstream and downstream ports simultaneously; opening the central body bleed valve verifies absolute isolation.
In-Line Resilient Slip Replacement
Through the lower body access flange, slips can be removed and replaced on-site without cutting the valve out of the pipeline.
Zero Degradation in Frequent Cycling
Because seals never slide against metal seats, the Twin Seal design maintains bubble-tight API 6D Rate A tightness across tens of thousands of cycles.
Explore All 4 Plug Valve Sub-Categories
1:1 aligned with TSV factory catalog. Severe-service quarter-turn plug valves with positive dynamic sealing.
Lubricated Taper Plug Valve
API 599 dynamic sealant injection grooves for high-pressure dirty natural gas and slurry manifolds.
API 599 Lubricated View Lubricated Taper Plug Valve →PTFE Sleeved Non-Lubricated Plug Valve
Full 360° virgin PTFE sleeve offering zero maintenance and zero lubrication in corrosive chemical media.
PTFE Sleeved View PTFE Sleeved Non-Lubricated Plug Valve →Inverted Pressure Balanced Plug Valve
Dynamic pressure balance channels preventing plug taper lock in severe cyclic high-differential service.
Pressure Balanced View Inverted Pressure Balanced Plug Valve →Twin Seal DBB Double Plug Valve
Mechanical expanding slips for zero friction wear and verified double block and bleed in custody transfer.
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