GESTRA VK 14, PN 16 VK 16, PN 40 DN 15, 20, 25, 40, 50

Vaposcope® Sight glasses

GESTRA VK 14, PN 16 VK 16, PN 40 DN 15, 20, 25, 40, 50 Vaposcope® Sight glasses
GESTRA VK 14, PN 16 VK 16, PN 40 DN 15, 20, 25, 40, 50 Vaposcope® Sight glasses
GESTRA VK 14, PN 16 VK 16, PN 40 DN 15, 20, 25, 40, 50 Vaposcope® Sight glasses

GESTRA VK 14, PN 16 VK 16, PN 40 DN 15, 20, 25, 40, 50 Vaposcope® Sight glasses

The VK 14 and VK 16 sight glasses are designed for monitoring the flows of fluid in pipes. The sight glass is fitted upstream of the steam trap, allowing users to recognise any loss of steam or banking-up of condensate in steam traps.

Design

VK 14

Straight-through type body with parallel sight glasses made from borosilicate glass for fluids ≤ pH 9 at either end. The equipment has no moving parts.

Optional extras: mica shields

VK 16

Straight-through type body with parallel sight glasses made from borosilicate glass for fluids ≤ pH 10 at either end. The equipment has no moving parts.

Fitted with mica shields as standard.

Fluids

The equipment is designed for the following fluids (in accordance with the EU Pressure Equipment Directive or Pressure Equipment (Safety) Regulations in the UK):

VK 14, VK 16

  • Group 2 fluids

Chemical and corrosive influences must be taken into consideration.

We reserve the right to design connections as welding neck flanges, socket-weld ends or butt-weld ends via transition pieces.

VK 14

  • Flange EN 1092-1 B1, PN 16

VK 16

  • Flange EN 1092-1 B1, PN 40
  • Flange ASME B 5, Class 150 RF
  • Flange ASME B 5, Class 300 RF
  • Screwed socket ISO 228-1, G
  • Screwed socket ASME B 11, NPT
  • Socket-weld end DIN EN 12760 / ASME B 11, Class 3000

VK 14

Component EN ASTM1  / ASME
Body 5.1301 A 126 Class B
Union nut2 1.1181 A 194-2H
Flange3 1.0460 SA 105
Bolts for body4 5.6 –
Sight glass MAXOS® borosilicate glass, DIN 7080
Sight glass gasket Graphite/CrNi

1 ASTM material is comparable to the EN material. Pay attention to differences in chemical and physical properties. For more information, contact the manufacturer.

2  For fastening the sight glass of the DN 15–25, to ISO 8434-1, type N, series S

3  For fastening the sight glass of the DN 40–50

4  Hexagon head bolt M16 x 40, EN 24017, for fastening the sight glass
 

VK 16

Component EN ASTM/ASME
Body 1.0460 SA 105
Insert 1.0619 SA 216 WCB
Flange1 1.0460 SA 105
Bolts for body2 5.6 –
Sight glass MAXOS® borosilicate glass, DIN 7080
Sight glass gasket Graphite/CrNi

1  For fastening the sight glass of the DN 40–50

2  Hexagon head bolt M16 x 40, EN 24017, for fastening the sight glass

GESTRA VK 14, PN 16 VK 16, PN 40 DN 15, 20, 25, 40, 50

Vaposcope® Sight glasses

GESTRA: The Ultimate Solution for Industrial Steam & Fluid Control Systems

High-Performance Steam Flow Sight Glasses for Industrial Applications

The GESTRA VK 14 PN 16 and VK 16 PN 40 Vaposcope® Sight Glasses are premium-quality flow indicators designed to provide clear, reliable visual monitoring of steam, gas, and liquid flow in industrial pipeline systems. Available in DN 15, DN 20, DN 25, DN 40, and DN 50, these Vaposcope® sight glasses deliver outstanding durability, safety, and performance under demanding operating conditions.

GESTRA is a globally recognized manufacturer of steam and condensate management solutions, and the VK 14 and VK 16 Vaposcope® models are industry standards for visual flow indication in steam systems.

Key Advantages:

  • ✔ Clear visual flow indication for steam, gas, and liquids

  • ✔ Designed for high-pressure and high-temperature applications

  • ✔ Long service life with minimal maintenance

  • ✔ Robust industrial construction

  • ✔ Original GESTRA quality and reliability

The GESTRA VK 14 PN 16 is suitable for medium-pressure applications, while the GESTRA VK 16 PN 40 is engineered for high-pressure steam and process systems.

Available Sizes:

  • DN 15

  • DN 20

  • DN 25

  • DN 40

  • DN 50

Both models use the patented Vaposcope® principle, which makes steam flow clearly visible through condensation and turbulence, even at high velocities.

  • Nominal pressure:

    • VK 14: PN 16

    • VK 16: PN 40

  • Nominal diameters: DN 15, 20, 25, 40, 50

  • Application media: Steam, gases, and liquids

  • Connection type: Flanged

  • Housing material: High-strength metal alloy

  • Sight glass: Heat-resistant industrial glass

The GESTRA Vaposcope® sight glasses are widely used in various industries:

  • Steam distribution lines

  • Boiler houses and power plants

  • Chemical and petrochemical industries

  • Food & beverage processing

  • Pharmaceutical and manufacturing plants

They are essential components for system monitoring, troubleshooting, and operational safety.

Choosing original GESTRA VK 14 and VK 16 Vaposcope® Sight Glasses ensures:

  • Accurate visual confirmation of flow conditions

  • Reduced risk of system failure

  • Improved operational safety

  • Compliance with industrial standards

  • Lower total cost of ownership

Feature VK 14 PN 16 VK 16 PN 40
Pressure Rating PN 16 PN 40
Operating Conditions Medium pressure High pressure
Sizes Available DN 15–50 DN 15–50
Application Steam, gas, liquid Steam, gas, liquid

We supply 100% genuine GESTRA products with professional support for industrial customers worldwide.

What We Offer:

  • Original GESTRA Vaposcope® Sight Glasses

  • Competitive pricing for DN 15–50

  • Fast and secure global shipping

  • Technical consultation and after-sales support

We supply 100% genuine GESTRA products with professional support for industrial customers worldwide.

What We Offer:

  • Original GESTRA Vaposcope® Sight Glasses

  • Competitive pricing for DN 15–50

  • Fast and secure global shipping

  • Technical consultation and after-sales support

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