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Over-Pressure Protection UHV Viewports

UHV material processing frequently involves the introduction of gases at regulated pressures. In the event of an unintentional or inadvertent pressure burst, fragile components such as vacuum UHV viewports are subject to damage. Whereas burst discs or pressure relief valves can mitigate risk, windows proofed to withstand such pressure can avoid catastrophic rupture in critical UHV applications.

Conflat™ flanges, the most commonly used for UHV, cannot be rated per the ASME boiler pressure vessel code. The upper limit of pressure for such flanged joints is dependent upon the system mating flange; the material and hardness of the gasket; and, the strength and torque of fasteners. The use of Conflat™ mounted, over-pressure protected UHV viewports is not recommended for continuous or intentional use under pressure.*

Over-pressure protected UHV viewports are fully tested at 150% of the rated pressure. For standard Conflat™ UHV viewports, the maximum overpressure protection offered is 200 psi. The sapphire window assemblies are designed with greater than 10x safety factor and tested to 300 psi.

*For pressure applications, MPF can provide safe designs utilizing ASME B16.5 flanges. MPF has designed UHV viewports for service up to 20 kpsi using customer specified mounts.

Over-Pressure Protection UV Sapphire Viewports Specifications

Leak Rate: Less than 2x10(-10) atm cc/sec He
Parallelism: 3 arc-minutes or less
Flange Material:  304 stainless steel
Surface Finish: 50/20 
Material:  Sapphire
UV Transmission:  50% @ 250nm
Orientation: 
Over-Pressure Limit: 200 psi (tested to 300 psi)



Over-Pressure Protection UV Sapphire Viewports Specifications



STEP Ø "A" VIEW Ø "B" Ø "C" "D" "E" PART # PRICE PDF

Download Step File
0.75 1.23 2.75CF 0.25 0.50 A12819-1-CF $750.00
Download PDF

Download Step File
1.50 1.98 4.50 CF 0.35 0.68 A12820-1-CF $1125.00
Download PDF

Download Step File
2.00 2.48 6.00 CF 0.41 0.78 A12821-1-CF $1775.00
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Over-Pressure Viewports

VIEWPORT, SAPPHIRE, UV, OVER-PRESSURE, 0.75 VIEW, 275CF
VIEWPORT, SAPPHIRE, UV, OVER-PRESSURE, 0.75 VIEW, 275CF
UV Grade Sapphire Viewport, Over-Pressure, 0.75" View Dia, 2.75" Conflat Flange
A12819-1-CF
step icon
$788.00
49856
Add To Cart
VIEWPORT, SAPPHIRE, UV, OVER-PRESSURE, 1.50 VIEW, 450CF
VIEWPORT, SAPPHIRE, UV, OVER-PRESSURE, 1.50 VIEW, 450CF
UV Grade Sapphire Viewport, Over-Pressure, 1.50" View Dia, 4.50" Conflat Flange
A12820-1-CF
step icon
$1,182.00
49857
Add To Cart
VIEWPORT, SAPPHIRE, UV, OVER-PRESSURE, 2.00 VIEW, 600CF
VIEWPORT, SAPPHIRE, UV, OVER-PRESSURE, 2.00 VIEW, 600CF
UV Grade Sapphire Viewport, Over-Pressure, 2.00" View Dia, 6.00" Conflat Flange
A12821-1-CF
step icon
$1,864.00
49858
Add To Cart

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