Watt-Class Beamstoppersfor ALS

01/26/2011Tom Swain & Mike Kritscher

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

2.75” CF version (DN40 clear-aperture)

ES PSS Assembly

Safety Requirements:Established OP 02-30

LOTO Features

Leash

Helical spring not shown

Lockable “Closed” position Visible indication of locked position Locking pin is retained by Leash

Section Views

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.

Limit Switch Assembly senses true close and open (tri-state feedback)

Slot for position indicator tang

Open and Closed visual position indication

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

Solid Stainless Gate DetailsPaddle in “Closed Position” Clear-aperture: 40.1 mm Gate overlap: 7.2 mm

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.

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