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Plug Valve

Twin Isolation Plug Valves

A Twin Isolation Plug Valve is a type of valve that features two separate plugs within a single body. This design allows for independent operation of each plug, providing dual isolation capability.


Plug Valve - Twin Isolation
Size Range

2 – 24 NPS, DN50 - DN600

Body Materials

ASTM A216, A105, A350, A182, A351, A352, A890, A995.

Temperature Range

-29°C to 450°C

Plug Materials

ASTM A216, A105, A350, A182, A351, A352, A890, A995.

Maximum Allowable Operating Pressure

ANSI 150#, ANSI 300#, ANSI 600#

Seat Materials

PTFE, NYLON, PEEK, NBR, KELF, ENP (Electroless nickel plating), HC (Hard chrome).

Shutoff Rating

Bidirectional Bubble-tight

Body Style

Flanged End, Butt Weld, FE V/s BW

Design Standard

API 6D, ASME 16.34

Flange Drilling

ASME B16.5

Testing Standard

API 598, ISO 5208, EN 12266-1

Face To Face

ASME B16.10


Oil & Gas, Water Treatment, Power Generation

Features & Benefits:
  1. Dual Isolation Capability: The primary feature of twin isolation plug valves is their ability to independently isolate two different flow paths within a single valve body. This dual isolation capability allows for greater flexibility and reliability in shutting off fluid or gas flow.

  2. Redundancy and Reliability: The presence of two separate plugs means that if one plug or sealing element needs maintenance or replacement, the other plug can still provide isolation. This redundancy minimizes downtime and ensures continuous operation in critical processes.

  3. Tight Shutoff: Twin isolation plug valves are designed to provide tight shutoff, minimizing leakage even under high-pressure or high-temperature conditions. This characteristic is essential in preventing product loss, maintaining process integrity, and complying with environmental regulations.

  4. Versatility in Applications: These valves are suitable for a wide range of fluids, including corrosive chemicals, abrasive slurries, hydrocarbons, and gases. They are used in industries such as oil and gas, chemical processing, power generation, water treatment, mining, and pulp and paper.

  5. Ease of Maintenance: Despite their robust design, twin isolation plug valves are often designed for easy maintenance. This includes features such as accessible sealing elements and plug removal mechanisms, reducing downtime during maintenance activities.

  6. Long Service Life: Built with durable materials and precision engineering, twin isolation plug valves are designed for long service life and reliable performance in demanding industrial environments. This durability contributes to overall cost-effectiveness and operational efficiency.

  7. Safety and Environmental Compliance: By providing secure isolation of process streams, these valves contribute to operational safety by minimizing the risk of leaks or spills that could lead to safety hazards or environmental contamination.

  8. Customizable Configurations: Manufacturers often offer customizable configurations to meet specific project requirements, including different sizes, materials of construction, pressure ratings, and end connections.

In summary, twin isolation plug valves combine dual isolation capability with reliability, tight shutoff, versatility, and ease of maintenance. These features make them indispensable for industries where fluid or gas flow isolation is critical to operational safety, efficiency, and environmental compliance.

Nistha Global