Sigma Industries
ISO 9001:2008 Certified Company

Quality Policy
  • We shall develop, manufacture and supply quality products to meet customer requirements.
  • We shall set up, implement and maintain an effective quality management system.
  • We shall continually work towards improving the effectiveness of the quality management system with involvement of personnel at all levels.

Quality Objectives

  1. To ensure that personnel at all levels understand customer requirements and are trained to meet the requirements for ensuring customer satisfaction.
  2. To establish, implement and maintain an effective quality management system based on the International Standard ISO 9001:2008.
  3. To ensure that the quality management system is used as a tool for improving our products, processes and systems so that we are able to meet changing requirements of our customers at most economical cost.


Following is the Sequence of Inspection Process followed by Sigma.
Inspection Process Flow
1 Castings & Forgings
  1. Source Inspection
  2. Review of Test Certificates
  3. Inward Inspection
  4. Chemical / Physical Tests Cross Check
  5. Shell Test
  6. NDT for New / Change in Pattern.
Only on Samples and where specified
  1. D.P. Test on Machined Ends.
  2. Radiography of Castings.
  3. Ultrasonic Examination of Forgings / Bars.
3 Machined Parts
  1. Material Verification.
  2. On-Line Inspection
  3. Interchangeability.
  4. Final Inspection
4 Assembly
  1. Visual Inspection
  2. Performance Tests
5 Testing Ref. : API 598 / BS 6755 (1) / MSS.SP.61
  1. Shell Test
  2. Back Seat Test
  3. Seat Test
  4. Gland Leak Test
  5. Functional Check
6 Final Inspection
  1. Markings.
  2. Dimensional Check of End Connection.
  3. Quality Check of Assembly.
  4. Visual Inspection.
  5. Acceptance Mark.