- Clean body interior portion and seat surface thoroughly with suitable cleaning liquid check up for any scratches on seat ring surfaces. Minor scratches should be removed by lapping with emery paste with the help of body seat lapping fixture.
- Remove old gland packing from bonnet stuffing box. Clean the bonnet surface from inside; lap the degree surface of back seat bush with the help of suitable fixture or by spindle itself. Clean threaded portion of the spindle.
- Change the body bonnet joint gasket and assemble the valve. Put new gland packing of required.
- In case the leakage persists, open the body/bonnet joints and see if there is damage on the wedge surface. Repair this type of damage.
- Only VALVEGRIND make silicon carbide (extra course) lapping compound should be used. Before starting the lapping operation on the surface of the seat/wedge, ensure that machined burns are removed.
- All the valve stems are to be repair for the following: Straightness, Damage to head and threads, Corrosion, Pitting and taper in the portion that slides through the packing.
- Old gland packing should be removed by using angular scriber and replace with new packing of correct size having open ends placed 180 with each other.
