Instruments/Products
Sight Glass
◇Tank Wall Welding Type
 (Transparent): SG-1T
◇Flanged, Flow Type: SG-3F 
◇Flanged, w/Wiper Type:
  SG-8F
◇Tank Wall Welding Type
  (Reflex): SG-1R
◇Flanged, Flapper Type: SG-4F ◇Flanged, w/Cleaning Nozzle:
  SG-8S
◇Tank Wall Welding Type (Round): SG-2 ◇Flanged, Ball Float Type: SG-7F ◇Flanged, w/Jacket Type:
  SG-9F
◇Tank Wall Welding Type
  (Transparent, w/Valve): SG-V1T
◇Threaded, Flow type: SG-3S ◇By-Pass Type: SG-VP
◇Tank Wall Welding Type
  (Reflex, w/Valve): SG-V1R
◇Threaded, Flapper Type SG-4S ◇Flanged, Short-Pipe Type:
  SG-10F
◇Regular Type Peep Sight: SGP-A ◇Threaded, Ball Float Type: SG-7S ◇Safety Reinforced Type: SGA
◇Safety Peep Sight: SGP-S ◇Flanged, Lantern Type: SG-6F
 Safety Reinforced Type: SGA
Application and Features
The sight glass is so designed as to have multiple protection of its glasses from internal or external pressure thus ensuring absolute safety. Flowing or remaining stuff in the sight glass does not flow out immediately even if a part of the glasses may be damaged by some mishap. Therefore, possible accident can be prevented
As the construction of the viewing port of this sight glass is a cartridge containing sealed up three layers of circular flat glasses, replacement work is as easy as to replace the cartridge with a new one when a part of the layers may be damaged.
A conventional general purpose sight glass can be easily replaced with this safety reinforced sight glass by altering cover plates, bolts, gaskets and glasses to the cartridges.
Inner-most glass faced to the liquid in the cartridge is a tempered hard glass with a fluoride resin film laid over its liquid side surface in case where the sight glass is used under temperature below 180℃, with which it can be applied to a highly corrosive liquid.
In addition to the contrivance, various considerations have been taken in to secure safety in case where the sight glass is used for steam service, say to employ mica shield. The sight glass becomes safer instrument against external impact if such fitting as covering lid or net is provided with.
Standard Specification
  Material: Carbon Steel, Stainless Steel, Alloys
  Dimensional table of Cartridges (Unit:mm)         
 
D
70
85
100
110
135
160
d
42
60
70
70
95
120
T
30
30
35
35
40
55
  Note: The table is applicable to the cartridge to be used under design pressure 1 MPa (10kgf/cm2). Contact with us for advice if the sight glass is used under higher pressure.