Specialty Windows - High Pressure, Vacuum & Sight Glass Windows

high pressure sight window
high pressure flow level indicator

PST can supply standard and custom designed sight windows, high pressure windows and vacuum windows. Proprietary methods are used to seal and fuse glass, sapphire, fused silica and other exotic window materials to threaded and flanged metal and ceramic housings.

Pressure Ratings:

  • Low pressure: From vacuum to 700 KPa
  • High pressure: up to 30 MPa
  • Very high pressure: up to 60 MPa
  • Higher pressures can be achieved with custom designs

Housing Materials:

  • Standard materials: Stainless Steel 303 & 17-4
  • Specialty materials: Kovar, Aluminum, Monel, Inconel, Titanium, Alloys & Ceramic

Sight Window Materials:

  • Sapphire     
  • Soda Lime & Borosilicate (Pyrex™)
  • Fused silica & Fused quartz
  • Exotic window materials: ZnSe, CaF, ZnS, MgF2, YAG

2000psi pressure sight glass window
high pressure indicator

Applications for our Glass and Sapphire Windows:

  • Standard NPT and BSPT Glass & Sapphire Sight Windows for: conventional refrigeration systems, pilot & flame indicators, fluid level indicators & particle counters, pyrometry and thermal sensors
  • High Pressure Sight Windows for: R744/CO2 systems, deep sea & down hole petroleum camera and lighting applications, High pressure research
  • High Vacuum fused silica, Glass & Sapphire Sight Windows: for microwave windows, plasma systems, research
  • High Impact Glass & Sapphire Sight Windows for - Security windows, combustion chambers, explosion barriers, furnace windows
  • Medical and analytical: particle measuring, laser measuring, vapor analyzers
  • Annular Sapphire & Glass Sight Windows for down hole imaging & inspection in the petroleum industry

Low Pressure Sight Windows
NPT/
BSPT
B C D E
2" 2.500 1.875 0.760 0.290
1-1/2" 2.000 1.510 0.715 0.270
1-1/4" 1.625 1.300 0.670 0.254
1" 1.313 0.980 0.670 0.238
3/4" 1.100 0.760 0.549 0.222
1/2" 0.880 0.610 0.525 0.206
3/8" 0.690 0.460 0.396 0.190
1/4" 0.560 0.350 0.396 0.175
High Pressure Sight Windows
NPT/
BSPT
B C D E
2" 2.500 1.375 0.760 0.360
1-1/2" 2.000 1.060 0.715 0.337
1-1/4" 1.625 0.896 0.670 0.318
1" 1.315 0.731 0.670 0.298
3/4" 1.100 0.510 0.549 0.278
1/2" 0.880 0.415 0.525 0.258
3/8" 0.690 0.385 0.396 0.239
1/4" 0.560 0.300 0.396 0.219

NPT and BSPT standard