Soft-Seated Ball Valves and Diaphragm Valves
Soft-Seated Ball Valves and Diaphragm Valves
ITT Industrial Process, formerly known as ITT Grinnel, designs and manufacturers Commercial, Safety-Related and ASME Code Section III ball valves and diaphragm valves for the nuclear power industry. The nuclear industry has depended on the Cam-Tite® ball valve and the Dia-Flo® diaphragm valve for performance and economical process isolation and control for hazardous and corrosive applications.
Since 1963 ITT has supplied over 40,000 products worldwide in nuclear power applications such as service water, radwaste, instrument air, and containment isolation. All valves receive a complete series of quality inspections ranging from industry standards to specialized radiography and PMI. In the fall of 2008, Curtiss-Wright Nuclear became the exclusive nuclear distributor for ITT's Dia-Flo® diaphragm valves and Cam-Tite® ball valves.
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Dia-Flo® Diaphragm Valves
ITT Dia-Flo diaphragm valves are heavy-duty industrial control valves providing an economical solution for throttling or on-off control requiring isolation from the process. Since 1976, ITT has supplied both commercial and safety-related diaphragm valves for the nuclear industry. Applications include service water systems, boron regeneration, and chemical volume control. Diaphragm valves are an economical choice for bubble tight shutoff and ease of maintenance for applications not exceeding 200 psi and 350°F. A wide variety of wetted materials and accessories make this valve an optimum solution for the nuclear power industry.
| Bonnet Isolation | Working parts are isolated from the process |
| Diaphragm Materials | Compatible with a broad range of fluids |
| Streamlined Flow Path | No cavities or entrapment of radioactive waste |
| Simple Diaphragm Design | Diaphragm replacement for a virtually new valve and saves time and cost to repair valves |
| No Packing Gland or Packing | No packing leakage problems or adjustment |
| Simple to Automate | Pneumatic or electric actuation with switches, limits, and indicators |
The Dia-Flo diaphragm valve uses a linear stem movement to position a flexible diaphragm over a seat to regulate fluid flow. As stem movement compresses the diaphragm against the seat in the shape of a saddle or bridge, a tight seal is created. This design provides a bi-directional, bubble tight shutoff at full line pressure. The diaphragm valve is available in two configurations, weir or straightway design, depending on the fluid properties to be controlled. The diaphragm valve employs a streamlined full port flow path that has no crevices or cavities. This minimizes entrapment of radioactive contaminates or particles.
A key feature of the diaphragm valve is to isolate the process fluid from the area above the diaphragm and to the atmosphere. The bolted bonnet houses the diaphragm and provides a reliable barrier from the process. Additional isolation is provided by using an extended bonnet for secondary containment.
| Size: | 1/2" to 12" |
| Ratings: | ANSI Pressure Class 150 to 300 |
| Connections: | Threaded, Flanged, Socket Weld and Butt Weld |
| Quality Class: | Commercial, Safety-Related and ASME Code Section III |
PWR, BWR, CANDU
- Essential Service Water Flow Control
- Chemical Volume Control, Level Control
- Radwaste System Isolation
- Boron Regeneration, Flow Control and Shutoff
- Instrument Air for Containment isolation, Shutoff
Cam-Tite® Top Entry Ball Valves
The ITT Cam-Tite ball valve is a top entry, single body construction providing positive shutoff and process isolation of severe service applications. Cam-Tite ball valve has a long history of reliability in nuclear power plants worldwide in many systems that handle difficult fluids.
The unique design has developed a reputation for performance unequaled by conventional floating ball designs. A few of these features include the patented caged bonnet, welding in-line without disassembly, and superior stem sealing. The Cam-Tite ball valve is available with a manual handwheel or easily automated with electric or pneumatic operators.
| Top Entry, Caged Bonnet | Quick and easy turnaround during scheduled maintenance All internal components are removed by lifting off the bonnet assembly |
| Weld Without Disassembly | Removal of valve not required, saves time and cost , reduced ALARA exposure |
| Non-Spherical Ball | Mechanically compresses both upstream and downstream seats, creating a tight seal independent of line pressure |
| Low Operating Torque | Reduces lateral loads on valve stem, prolonging stem life |
The Cam-Tite ball valve is a quarter turn with a uniquely designed ball geometry that is optimized for tight shutoff and process isolation. The spherical surface around the port edge of the ball is machined away, forming a bevel that passes completely around the port opening. The resulting non-spherical ball mechanically compresses both upstream and downstream seats to affect a tight, dependable seal independent of line pressure.
The Cam-Tite is unique from other floating ball valve designs since it does not rely on upstream pressure to force the ball into the seat to create a seal. Breakaway torque is also minimized with this valve, which is especially important when the valve remains in the closed position for long periods of time.
The top entry design employs a bolted bonnet which provides mechanical support for the valve stem using upper and lower stem seals. By using upper and lower stem seals, lateral loading is minimized maintaining near perfect alignment. This results in a low operating torque and long stem seal life without leakage. The top entry design feature allows for easy removal and replacement of all trim components utilizing one subassembly.
| Size: | 1" to 6" |
| Ratings: | ANSI Pressure Class 150 to 600 |
| Connections: | Threaded, Socket Weld and Buttweld |
| Quality Class: | Commercial, Safety-Related, and ASME Code Section III |
PWR, BWR, CANDU
- Instrument Air Supply Isolation valve
- ECCS Shutoff Valves
- CVCS Isolation Valves
- MSR Drain Tank – Shutoff Valve
- CCW Heat Exchanger – Temperature Control
- Emergency Diesel Generator , Fuel Supply Shutoff Valve
- Containment Air Isolation Valve Radwaste Handling
- Reactor Water Cleanup System
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