It is cost effective to make valve cages reconditioning. Reneko has a Class-approved technology and offers complete valve cages reconditioning service.
There is 2 main problems during exhaust valve cages operation: wear-out of the sealing field and water hollow space jam. In both cases this procedure is applicable.
Reconditioning of valve cages, without replacing seat ring by new can be performed “from the technical point of view” but it is not recommended for the following reasons:
- Seat ring base is made of steel and may not be intended for another working cycle.
- Water passages shall be mechanically de-clogged for further reliable operation.
- It is good to make internal inspection of the housing cooling space in order to deep corrosion wear detection.
So, we recommend to make full valve cage reconditioning with seat ring replacement.
Full valve cage reconditioning process consist of:
- Cleaning and inspection
- Old valve guide removal
- Bed under valve guide measurements& recording
- Cutting-off old seat ring
- Cleaning and de-clogging of water cooling passages
- New seat ring manufacturing – Stellite
- New seat ring installation as per special procedure
- Corrosion protection
- Pressure testing & NDT
- Valve guide installation
- Parameters recording - paperwork
New seat ring installation: Special welding procedure for dissimilar welding joints is used to get a reliable and waterproof joint between a housing and a seat ring.
There is 2 main problems during exhaust valve cages operation: wear-out of the sealing field and water hollow space jam. In both cases this procedure is applicable.Reconditioning of valve cages, without replacing seat ring by new can be performed “from the technical point of view” but it is not recommended for the following reasons:
- Seat ring base is made of steel and may not be intended for another working cycle.
- Water passages shall be mechanically de-clogged for further reliable operation.
- It is good to make internal inspection of the housing cooling space in order to deep corrosion wear detection.
So, we recommend to make full valve cage reconditioning with seat ring replacement.Full valve cage reconditioning process consist of:
- Cleaning and inspection
- Old valve guide removal
- Bed under valve guide measurements& recording
- Cutting-off old seat ring
- Cleaning and de-clogging of water cooling passages
- New seat ring manufacturing – Stellite
- New seat ring installation as per special procedure
- Corrosion protection
- Pressure testing & NDT
- Valve guide installation
- Parameters recording - paperwork
New seat ring installation: Special welding procedure for dissimilar welding joints is used to get a reliable and waterproof joint between a housing and a seat ring.
