Instrument Valves > Gauge Valves > Hex Valve HGVS


Hex Valve HGVS Gauge Syphon for Steam and Heat-Transfer Media

Hex Valve’s HGVS gauge syphon acts as a thermal and liquid seal barrier between hot process vapors and the gauge pressure instrument. The HGVS provides maximum instrument protection in half the space of the traditional pigtail syphon.

Using a syphon with a smaller radius minimizes the weight and deflection stress at the primary valve, which should help decrease problems associated with system vibration. The HGVS has fewer threaded connections and leak points than other syphons and comes with an integral shutoff valve.

Key Specifications

  • Reduces installation radius by up to 65% over conventional pigtail syphons
  • Decreases system vibration issues; minimizes deflection stress at primary valve or gauge connection
  • Provides constant thermal barrier for high process temperature or freeze-up conditions
  • Minimizes potential leak points by reducing number of threaded connections from four to two
  • Carbon steel or stainless steel body, integral seat, Graphite or TFE packing

Specifications, Manuals, and Supporting Literature

Click the file icon to view the file online, or right-click on the file icon and select "Save Target As..." to download the file to your computer for later viewing.
Tip: If you want to print a large file, download it to your PC first.

Model Selection Guide

Use this table to find the right model for your application.  Don't see the option you need? Call a Lesman sales specialist at 800-953-7626

Seat Packing Catalog Number
Carbon Steel
Catalog Number
Stainless Steel
1/2" 1/2" Integral Graphite HGVS1S3131413 HGVS1U3131413
1/2" 1/2" Integral TFE   HGVS1U3131412


Subscribe to the Lesman Instrument Company YouTube channel.Lesman Instrument Company on YouTube

Video is a great way to learn about instruments and technology, and it's available whenever you need it. Watch step-by-step instructions on how to configure a transmitter, tune a controller, or troubleshoot a safety valve. We'll post videos we create, and those our manufacturer partners share with us, so you don't have to look in multiple places to find the video training you need.

Subscribe to Lesman's YouTube channel, and you'll get email notifications as soon as we add new training videos and webinars.