Gauge, Sight Glass & Drain Valves: Types & Suppliers India
Gauge, Sight Glass & Drain Valves – Complete Guide & Supplier List
In industrial piping, monitoring, draining, and visually inspecting fluids is essential for safety, uptime, and maintenance. This cluster page explains the roles of gauge valves (pressure monitoring & isolation), sight glass valves (visual flow inspection), and drain valves (removal of unwanted fluids), and links to detailed guides on each.
1) Gauge Valves
A gauge valve is installed between a pressure gauge and a pipeline to isolate the instrument for calibration, removal, or surge protection.
Common Types
- 2-way gauge valve – basic isolation
- 3-way gauge valve – isolation + venting
- 5-way manifold – for differential pressure gauges
Typical Applications
- Steam boiler and process lines
- Gas compressor monitoring
- Fire hydrant pressure points
- Pharma & clean-room utilities
Read: Pressure Gauge Valve Types – Water, Steam & Gas Systems
2) Sight Glass Valves
A sight glass valve (sight flow indicator) enables real-time visual monitoring of fluid movement, clarity, and color.
Popular Configurations
- Full view sight glass
- Double window sight glass
- Flapper-type indicator
- Rotor-type indicator
Where It’s Used
- Food & beverage processing
- Chemicals, dyes & inks
- Boiler water lines
- Water treatment plants
Read: Sight Glass Valve – Visual Flow Monitoring & Maintenance Tips
3) Drain Valves
A drain valve removes water, condensate, or unwanted liquids from pipelines, tanks, and equipment. Brass drain valves are popular for their economy and corrosion resistance.
Main Types
- Manual brass drain valves
- Automatic compressor drain valves
- Needle-type precision drain valves
Applications
- Air compressor condensate removal
- Water tank flushing
- Low-pressure boiler blowdown
- RO & utility line drainage
Read: Brass Drain Valve – Sizes, Material & Best Brands
Material Selection Guide
| Valve Type | Common Materials | Why It’s Used |
|---|---|---|
| Gauge Valve | Brass, SS 304/316 | Pressure rating, corrosion protection |
| Sight Glass Valve | Cast iron, SS 304/316, Borosilicate/Mica glass | Strength, hygiene, thermal/chemical resistance |
| Drain Valve | Brass, SS 304 | Durability, economy (brass), corrosion resistance (SS) |
End Connection Types
- Threaded (BSP/NPT): fast install for small lines
- Flanged (ASA/DIN): scalable for large pipelines
- Welded (SW/BW): leak-proof for high pressure
Top Indian Suppliers
Udhhyog
Trusted source for gauge valves, sight glass valves, and drain valves—bulk pricing, quick dispatch, custom options.
+91-9311120784 | Contact Page
Other Brands
- Zoloto Valves
- Sant Valves
- Leader Valves
- L&T Valves
- Kranti Valves
Why Group These Valves Together?
- All are auxiliary valves supporting core pipeline operations
- Critical for safety, maintenance, and real-time monitoring
- Frequently sourced together in plant procurement
- Boosts SEO via silo interlinking to detailed articles
FAQs
- Can I use a brass drain valve for chemical fluids?
- Only for non-aggressive media. Use stainless steel for acids or high-chloride fluids.
- Are sight glass valves pressure-rated?
- Yes—ratings vary by body and glass material. Check the product datasheet.
- Can gauge valves be used for steam lines?
- Yes, when constructed from forged steel or stainless steel and properly rated for steam service.
Need technical help or a bulk price list? Call Udhhyog at +91-9311120784 or visit udhhyog.com.
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