Valve Position Indicator

The Valve Position Indicator is a mechanical enclosure that is designed for installation on valve packages. These packages are typically for on-off shutoff valves.

Primary Functions:

The three main functions of valve position indicators are:

1.  Local visual position indication – allowing plant crews to quickly and easy determine a valve’s position by the visual indicator that is a top of the visual position indicator enclosure.
   
2.  Electrical feedback from internal switches, sensors, transmitters and other similar devices which provide valve position to a PLC or control room by sending electrical signals that have the position encoded in the feedback signals.
   
3.  A local junction box that may be used to enclose position switches, provide a platform to mount solenoid valves and/or provide termination points for wiring the appropriate signal wire to the enclosure.
   

Interchangeable Terms

There are several terms for indicator that are synonymously and used interchangeably in the industry. Some of the more common terms are:

• Limit Switch
  
• Beacon
  
• Valve Position Indicator
  
• Valve Position Transmitter
  
• Switch Box
  

How to Select your Indicator:

Typically a valve position indicator is selected primary by the indicators design to withstand the environment to which it will be installed and operated in. Considerations such as weather ability, cycle life and hazardous area ratings are all considered when selected the proper unit.

Moniteur’s Offering

Moniteur offers a full range of products designed to perform in most of the world’s environments where plants commonly operate. Listed are some of Moniteur’s series products and a typical environment for which they are designed to operate within.

• Sentinel VPT – Hazardous Areas
  
• Sentinel S3 VPT – Hazardous Areas – ATEX
  
• Survivor I & II VPT – Washdowns and Div 2 Areas
  
• Watchman VPT – General purpose
  
• Companion VPT – Hazardous Areas with linear operated valves