Top Entry Ball Valves

Use of forgings and the independent spring or bellows loaded floating seats which are always in contact with the ball make these valves the preferred solution for various critical applications like cryogenic, high temperature, low emission, Emergency Shutdown (ESD) or High Integrity Pressure Protectors (HIPPS) systems and sub-sea.

• Valves can be equipped with bellow seals, steam flushing ports and protected bearings, to cope with medium/ high amounts of solids like tar sands or catalysts.
• Valves can be equipped with bellow seals, steam flushing ports and protected bearings, to cope with medium/ high amounts of solids like tar sands or catalysts.
• Approved by major end users and contractors and are designed to meet SIL3 requirements according to IEC 61508.
• Double or triple stem seal design (with lip seals or O-rings or optionally with leak off chambers for predictive maintenance) allows us to meet and exceed the most stringent low fugitive emissions norms (ISO 15848) making our valves suitable to handle toxic or lethal fluid services.
• The design will meet all requirements of critical service applications.
• Seats are always in contact with the ball to provide an effective tight seal even at low differential pressures.

Many of the alternative interstage attemperator systems overlook several or all of the root causes of failure. Such designs will lead to problems in your plant, it’s only a matter of time!

Some of the first signs of trouble start with uncontrolled spraywater flow and leakage. Scheduled inspections often reveal:

• Damaged spray nozzles
• Cracked attemperator housings
• Damaged seals
• Cracked steam pipes and boiler tubes
• Cracked/broken thermal liners
• High pressure drop through the spraywater control portion of the attemperator
• High thermal stresses caused by large temperature differences between the steam and the cooling water
• Poor atomization of the cooling water leading to large amounts of unevaporated water in the steam line
• Poor installation with short distances to downstream elbows, temperature sensors, or HRSG re-entry points.

The root cause of most interstage attemperator problems can be traced to four main system/installation parameters:

• Damaged spray nozzles
• Cracked attemperator housings
• Damaged seals
• Cracked steam pipes and boiler tubes
• Cracked/broken thermal liners
• High pressure drop through the spraywater control portion of the attemperator
• High thermal stresses caused by large temperature differences between the steam and the cooling water
• Poor atomization of the cooling water leading to large amounts of unevaporated water in the steam line
• Poor installation with short distances to downstream elbows, temperature sensors, or HRSG re-entry points.