Shut-Off Pig Valves

Shut-Off Pig Valves

Pigging is a method of introducing a mechanical device, commonly referred to as pigs or scrapers, inside a pipeline to perform various internal maintenance operations. The term PIG is said to be an acronym for "Pipeline Intervention Gadget". "Pigs" mechanically sweep and visually inspect inside of the pipeline. The pig (or scraper) is moved through the pipeline by the differential pressure caused by the process fluid moving past at a higher velocity. The pig is inserted into what is known as a "pig launcher" (or launching station) which is a part of the pipeline with an oversized diameter to accomodate the installation of the pig. The launching station is then closed and the pressure driven flow in the pipeline is used to move the pig down the pipe until it reaches the receiving trap (the pig catcher or receiving station) where it can be removed. Pigs are used daily in the operation of pipelines for a variety of reasons, the most common are: pipe cleaning for improved line efficiency; locating flow obstructions; pipeline inspection; separating different products flowing through the pipeline; corrosion control; air purge; water removal; and flow volume validation.

Pig Shut-off Valve

Pigging has been used successfully for many years to scrub large diameter pipelines in the oil and gas industry. Today, the use of smaller diameter pigging systems is growing in many continuous and batch processing plants, as plant operators are looking for improved productivity and ways to reduce costs.

Pig valves were implemented into the oil and gas industry over five decades ago. They are used extensively on oil and gas pipelines throughout Western Canada and the United States. They provide an efficient way to launch and retrieve pigs in the oil and gas industry, water treatment facilities, or anywhere critical pipelines need to be maintained.

Download the TVC Shut-off Pig Valve Catalog

Watch an Animation of How Pig Valves Work

TVC Shut-off Pig Valve

TVC Pig Shut-off Valve Features

  • Engineered, manufactured and tested to API 6D
  • Industry Standards: API 6D, ASME B16.34 and API 598
  • Meets NACE MR0175-03
  • Size range: 2” – 16”
  • Pressure Classes: ANSI Classes 150 to 1500
  • Standard temperature range: -20 to 300 deg. Fahrenheit
  • Special Order range: -50 to 400 deg. Fahrenheit
  • Materials: LF2, 316 SS, and Exotic Alloys as required
  • Seals: HSN, HNBR, James Walker, Viton, Teflon, Devlon Peek or as required

TVC Pig Shut-off Valve Benefits

  • Trunnion Block design offers reduced torque and robustness
  • Complete Range of Fluid flexibility and compatibility
  • Cost savings over conventional pigging systems and skids
  • Available as a Launcher, Receiver, or Catcher.
  • Forged construction reduces NDE requirements
  • Complete selection of pigging systems and accessories
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