- Check valve and seat for wear cavity, corrosion, pitting and any fault. They make ground in properly not to excess maker's limited dimension and clearances.
- Valve seat make surface finish by using lapping tools or machine, make 100% surface contact with valve disc confirm by blue matching impression.
- Make valve chest clean and drain line clear.
- Take hammer test of spindle for any crack and check its straightness.
- Take hammer test of compression spring for any fracture and check for corrosion. Check free length of spring is limited to 0.5% of original free length.
- Check guide plates and bushes for uneven wear and have sufficient clearance to allow free movement.
- Check compression nut and cover bush's threads and any sign of wear and tear
- Check easing gear and make free
- Connecting pin make free fit and check its bendiness
- Safety valve online setting as per required pressure after Boiler starts up
