MVS fully Lined Double Window Sight Glass (Sight Flow Indicator) provides clear visual flow indication on any corrosive service as all internal components other than glass have been fully lined with either PTFE, FEP, PFA, PVDF depending on application. Both the glasses are bolted with the body. Fluids can be viewed from either top or bottom side.

VS PTFE, FEP, PFA, PVDF, Lined Double Window Type Sight Glass (Sight Flow Indicator) is available in Cast Construction & Fabricated design to inspect the inline process fluid, It contains two toughened glasses mounted opposite to each other and are very easy to replace glass without dismantling the whole Sight Glass assembly from process line. 

MVS PTFE, FEP, PFA, PVDF, Lined Double Window Type Sight Glass (Sight Flow Indicator) are available with various thickness and diameter of glass to suit various applications respects to fluid pressure and temperature.

  Size Range

25 mm to 200 mm
Flange Dimensions

ANSI B 16.5 - 150# / 300 #, DIN PN 10 / 16, BS 10 TABLE D, E and F
Face to Face Standard ANSI B 16.10
Pressure Rating DIN PN 10 / PN 16, ANSI 150# / 300#
Temperature Range

-20°C TO 200°C depending on lining and body material selected.
Lining Options

PFA : Per - Fluoro - Alkoxy

FEP : Fluorinated - Ethylene - Propylene

ECTFE : Ethylene-Chloro-Tri-Fluoro-Ethylene

PTFE : Poly - Tetra - Fluoro - Ethylene

PVDF : Poly - Vinyli - Dene - Fluoride

P.P. : Poly - Propylene

HDPE : High - Density - Poly - Ethylene

Lining Thickness & Lining Spark Test Minimum - 3 mm to Maximum 5 mm Overall, Body liners & all wetted parts are spark

tested at 20,000 Volts KVDC


Hydraulic Test Body (Shell) - 20 Kg / Cm²

S.G. Iron, Ductile Iron, Cast Steel (WCB), S.S. 304 (CF8), S.S. 316 (CF8M)
Seat / Gasket

Linings (Body)


Tempered / Toughened Borosilicate Glass

ASTM A 193 GR. B7 / A 194 GR. 2H; Stainless Steel 304 / 316; Stainless Steel 304L / 316L

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