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NTGD Sight Glass
Your Trusted Sight Glass Expert

ISO 9001 Certified Manufacturer | Premium Quality Sight Glasses Since 2000 | Global Industrial Solutions

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About NTGD Sight Glass

NTGD Sight Glass is an ISO 9001 certified manufacturer based in Wenzhou City, Zhejiang Province, China. Since 2000, we have specialized in designing and manufacturing a wide variety of sight glasses for industrial applications across the globe.

We are committed to delivering proven quality and trustworthy service. Our product line includes flange sight glasses, float ball sight glasses, turbine type sight glasses, boiler sight glasses, tank sight glasses, and 3-way sight glasses, all manufactured to meet international standards such as ASTM, AISI, DIN, and BS.

20+
Years of Experience
50,000m²
Manufacturing Facility
NTGD Factory

Our Mission & Values

Top Quality

We never compromise on quality. Every product undergoes strict quality control and final pressure testing.

Fast Delivery

Efficient logistics and production ensure timely delivery to meet your project deadlines.

Customer Satisfaction

We strive to provide reliable, affordable solutions and exceptional after-sales support.

Continuous Improvement

We invest in technology and innovation to remain a leading sight glass manufacturer.

Our Complete Sight Glass Range

Engineered for Safety, Precision, and Durability in Industrial Applications

Flange Sight Glass Float Ball Sight Glass Sight Glass Valve Turbine Type Sight Glass Tank Sight Glass 3-Way Sight Glass

Featured Sight Glass Products

Float Ball Sight Glass

Float Ball Sight Glass

Ideal for visual monitoring of liquid levels with a floating indicator for enhanced visibility and accuracy.

  • High-pressure resistant
  • Stainless steel construction
  • Easy installation and maintenance
Flange Sight Glass

Flange Sight Glass

Robust design with flanged connections for secure installation in pipelines and tanks.

  • Complies with ASTM, DIN standards
  • Carbon and stainless steel options
  • Suitable for high-temperature systems
Toughened Glass Sight Glass

Toughened Mirror Sight Glass

Features heat-treated glass for superior strength and resistance to thermal shock.

  • Enhanced durability
  • Resistant to scratches and impacts
  • Ideal for harsh industrial environments
Sight Glass Valve

Sight Glass Valve

Combines a valve and sight glass for controlled flow observation and isolation.

  • Integrated shut-off function
  • Leak-proof sealing
  • Suitable for steam and liquid systems
Turbine Type Sight Glass

Turbine Type Sight Glass

Used to monitor fluid flow rate with a rotating turbine visible through the glass.

  • Visual flow indication
  • Corrosion-resistant materials
  • Low maintenance design
Tank Sight Glass

Tank Sight Glass

Designed for level monitoring in storage tanks and pressure vessels.

  • Graduated scale for precise readings
  • Available in various sizes
  • Secure mounting options
3 Way Sight Glass

3-Way Sight Glass

Allows for isolation, draining, and flushing while maintaining visual access.

  • Multi-functional operation
  • Compact and efficient design
  • Ideal for maintenance and cleaning
Boiler Sight Glass

Boiler Sight Glass

Specifically engineered for steam boilers to monitor water levels under high pressure.

  • High-pressure and high-temperature rated
  • Safety-compliant design
  • Long service life
View All Products

Why Choose NTGD?

Uncompromised Quality & Precision

At NTGD, we never compromise on quality. Our manufacturing process includes strict raw material inspection, in-process quality assurance, and final pressure testing for every unit.

We are equipped with advanced machining equipment and a comprehensive quality assurance system to ensure consistent, top-tier performance across all our sight glasses.

ISO 9001, ISO 14001, ISO 45001 Certified
Compliant with ASTM, AISI, DIN, BS Standards
Manufacturing Facility Quality Testing

Industries We Serve

Power Generation

Cement Industry

Food & Beverage

Chemical Processing

Dry Cleaning

Frequently Asked Questions

What is a sight glass?

A sight glass is a level sensor used to visually monitor the liquid level in tanks, boilers, or pressurized systems. It allows operators to observe fluid levels safely and accurately.

How does a sight glass work?

A sight glass operates on the principle of communicating vessels. The liquid level in the sight glass corresponds directly to the level in the connected tank or vessel, rising and falling in sync.

What materials are used in NTGD sight glasses?

We offer sight glasses in carbon steel and stainless steel, with toughened glass or mirror options for enhanced durability and visibility.

Are your products certified?

Yes, NTGD is ISO 9001, ISO 14001, and ISO 45001 certified, ensuring our products meet international quality, environmental, and safety standards.

Get in Touch

Have questions or need a quote? Our experts are ready to assist you with selecting the right sight glass solution for your application.

Phone

+86 138 6845 0646

Email

[email protected]

Location

NTGD Industrial Zone, Wenzhou City, Zhejiang Province, China

Visit Official Website to Contact
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