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Emergency shutdown test system

  • US 6,186,167 B1
  • Filed: 03/04/1999
  • Issued: 02/13/2001
  • Est. Priority Date: 03/04/1999
  • Status: Expired due to Term
First Claim
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1. An emergency shutdown system for a process control system comprising:

  • an emergency shutdown valve and associated valve actuator located within a desired portion of the process control system;

    an emergency shutdown controller providing output signals for commanding the operation of the shutdown valve in response to sensing of a failure event in the process control system;

    a solenoid valve coupled to the shutdown valve actuator and responsive to the shutdown controller output signals for venting the actuator to a fail state; and

    digital valve controller means for testing the operability of the emergency shutdown valve, including a pressure output coupled to the shutdown valve actuator for ramping said shutdown valve from a normal position to a test position and returning to the normal position, wherein the normal position includes one of a fully opened normal position and a fully closed normal position, and wherein the test position includes one of a partially opened test position and a partially closed test position.

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