1. Watt-Class Beamstoppers for ALS 01/26/2011 Tom Swain & Mike Kritscher

2. 01032-UE41-AUP1 Features:  DN40 Version Series 01 variant 01032-UE41-AUP1  2.75” CF flanges w/ 1.5” CA  Meets OP 02-30 requirements  LOTO Function  Double position limit switches  D-sub connector termination

3. 2.75” CF version (DN40 clear-aperture)

4. ES PSS Assembly Safety Requirements: Established OP 02-30

5. LOTO Features Leash  Helical spring not shown  Lockable “Closed” position  Visible indication of locked position  Locking pin is retained by Leash

6. Section Views

7. Limit Switch Reliability  There have been no reported failures of this switch in the field for the past 10 years (several thousands sold). These are featured on several types of valves that we sell.  This valve is designed for 50,000 cycles. The individual switch reliability is far better than this. And there are two of them.  There are dozens of these in service right now at ALS with no reports of limit switch failures with thousands of cycles of operation.

8. Limit Switch Assembly senses true close and open (tri-state feedback) Slot for position indicator tang Open and Closed visual position indication

9. Switch Dimensions / Details  43 mm paddle travel  41 mm switch gap  2 mm over travel  2 mm Fabrication tolance  3.2 mm (1/8” overlap )  7.2 mm total overlap  43 -7.2 = 35.8 eff. opening  40.1 ID – 35.8 = 4.3 over hang

10. Solid Stainless Gate Details Paddle in “Closed Position”  Clear-aperture: 40.1 mm  Gate overlap: 7.2 mm

13. Gate Failure scenarios Overlap in ‘fallen’ condition Thermal Loading Information:  At 1 Watt, the paddle should not exceed 70 C. We expect design to be suitable for steady state gate temperatures up to 250C.  VAT has not tested maximum absorbed power capabilities. Steady state FEA radiation models might be available on request. Pin Joint Failure:  If fixation pin comes out halfway, it will interfere with the bushing and the Open limit switches will not be asserted  VAT has never experienced this failure mode and considers it extremely unlikely. Paddle Pin or Web Failure  If the paddle were to become disconnected it would fall to the bottom of the body and it is large enough to ensure the clear aperture is covered with out gaps.

15. Quote and Contact Information  DN40 Version Series 01 variant 01032-UE41-AUP1  2.75” CF flanges with double set of limit switches, closing spring, LOTO function, D-sub common connector termination  $4,900 each for 2+ pcs  Delivery 12 Weeks ARO