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PLUG VALVES

PTFE SLEEVE PLUG VALVE

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OVERVIEW

The Vahn-Tech Sleeve Type Soft Sealing Plug Valves are suitable for use in various types of pipelines with working conditions such as normal pressure of Class 150 to Class 600 and an operating temperature of -29˚C ~ +180˚C within the following industries: petrochemical, chemical, pharmaceutical, fertilizer, and power plant etc. to cut off or turn on the flow medium in the pipelines.

TECHNICAL SPECIFICATIONS

DESIGN STANDARD API 6D / API 599 / BS 5353
SIZE RANGE 1/2” – 18”
PRESSURE RATING Class 150 – 600
WORKING TEMPERATURE -29˚C ~ +180˚C
END CONNECTION ASME B16.5 - Flange ASME B16.25 - Butt-Weld / Threaded End
FACE to FACE ASME B16.10
TEST & INSPECTION API 598 / API 6D

FEATURES

      • The inlet and outlet bore structure is designed to offer double sealing grooves with sealing rings. This design feature creates a gradient of sealing pressure ratio between sealing parts during the plugs’ rotation until the fully open or fully close position is reached, and the pressure between sealing parts ensures zero leakage.
      • The structure of double sealing grooves with sealing rings ensures the PTFE liner does not move inside the valve body and can also absorb the small distortion of the liner due to the temperature change. The reduced friction between the liner and the plug improves the service life of the sealing surfaces.
      • The design of the top assembly of the plug shaft, with the PTFE membrane, an O-ring and the gasket, allows for adjusting the pressure ratio between sealing surfaces to easily rotate the plug while ensuring the leakage tightness of both the outlet and the middle flanges.
      • The complete sealing process can be managed effectively independently of the pressure inside the pipeline.
      • The standard sleeve material is PTFE; however, other filling material can be adopted for the sleeve depending on the application temperature and medium to increase the valve’s service life.

LUBRICATED TYPE PLUG VALVE

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OVERVIEW

Vahn-Tech Lubricated Taper Plug Valves are suitable for use in pipelines with various kinds of working conditions, such as nominal pressure of Class 150 to Class 300 and an operating temperature of -25˚C to +325˚C within the following industries: petrochemical, chemical pharmaceutical, fertilizer and power plant, etc., to cut off or turn on the flow medium in pipelines.

Vahn-Tech has adopted a grease-sealed structure for the valve body's outlet, a convenient feature for pipelines with grain slurry medium. There is a grease chimb in the plug surface, where the grease gets in with higher pressure than the slurry in pipelines; thus, forming an oil film to isolate slurry with the plug of rest state from getting into the gap between the valve core and valve wall, which avoids rubbing. High-speed oil flow is generated under the plug’s dynamic state to impact slurry and prevent it from entering the gap, ensuring the normal operation of plug valves, and further enhancing the economic functions of slurry pipeline transportation engineering.

TECHNICAL SPECIFICATIONS

DESIGN STANDARD API 6D / API 599 / BS 5353
SIZE RANGE 1/2” – 14”
PRESSURE RATING Class 150 – 600
WORKING TEMPERATURE -25˚C ~ +365˚C
END CONNECTION ASME B16.5 - Flange ASME B16.25 - Butt-Weld / Threaded End
FACE to FACE ASME B16.10
TEST & INSPECTION API 598 / API 6D

FEATURES

      • The tightness function is realized by injecting grease from outside.
      • There is no cavity in the valve for the accumulation of the medium.
      • The applicable temperature for the plug valve depends on the grease used. 
      • Grease selection is based on the pipeline medium.
      • It has bi-directional flow, which is more convenient for installation and usage. 
      • The main valve flow bore patterns are: regular, venduri, short and three-way, etc. which can meet the requirement for various pipeline applications.