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In-Service Test Tool (ITT)

An in-line device installed between a safety relief valve and a pressure vessel for in-field testing of pressure settings and/or seat leakage.


A hydraulic pump or Nitrogen bottle, with a flexible hose, gauges, and needle valves can be attached to the connector nipple, and the relief valve can be tested to determine if the set pressure is correct without taking the line out of service, or removing the valve from the line.

CAUTION: Never use Oxygen.

  • Connections: 2″ x 2″ NPT. 1 1/2″ x 1 1/2″ NPT, 1” x 1” NPT


  • Body: Carbon or Stainless Steel (Specify)
  • Seat: Durable Plastic
  • Ball: Stainless
  • Connector Nipple: Stainless
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