Twin Seal Plug Valve

A twin seal plug valve uses separate sealing surfaces around the plug to provide isolation on both sides of the valve. African Valve, being a top Twin Seal Plug Valve Supplier in Nigeria, provides these valves for oil, gas, water and industrial systems where high-integrity isolation and reduced product accumulation are required. 

Key Features

• Twin Sealing: Provides sealing on both sides of the plug.

• Double-Block-and-Bleed: Suitable configurations allow pressure to be relieved or monitored between seals.

• Cavity-Free Construction: Helps minimise process-medium accumulation inside the valve.

• Bi-Directional Flow: Suitable for flow in either direction.

• PTFE Sleeve Seal: Provides the primary sealing interface in sleeved configurations.

• Fire-Safe Options: API 607 / API 6FA can be specified where required.

• Manual / Automated: Available with handwheel, gearbox or actuator operation.

Technical Specifications

Materials & Components

• Body: Carbon Steel / Stainless Steel / Alloy Steel

• Plug: Carbon Steel / Stainless Steel / Alloy Steel

• Sleeve: PTFE

• Sealing Edge: Metal Retaining Edge

• Packing: PTFE / Graphite

• Gaskets: SS304 / SS316 + Graphite

• Bolting: Carbon Steel / Stainless Steel

Applications in Nigeria

Twin seal plug valves are suitable for crude-oil pipelines, gas transmission, refineries, petroleum terminals, water systems and chemical-processing facilities, where bidirectional isolation and controlled sealing are important.

Standards

Applicable standards include API 599, API 6D and ASME B16.34, with ASME B16.5/B16.47 for relevant flanged connections and API 598/API 6D/ISO 5208 for applicable testing. API 607 or API 6FA can apply to fire-safe configurations.