four-way sight glass

ANSI Four-Way Mirror (4-Way Sight Glass)

ANSI four-way mirror (4-way sight glass) for high-pressure pipelines. Borosilicate or quartz, ANSI flanges up to 1500 LB, datasheet & replacement sizes.

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Description

ANSI four-way mirror — also called a four-way sight glass — gives reliable visual inspection at pipe junctions. This US-standard tubular assembly supports high pressures and high temperatures. Choose borosilicate glass for general service or quartz for extreme heat. We supply ANSI-drilled flanges (up to 1500 LB), multiple body materials, and replacement glass to standard DN sizes.

Quick highlights

  • Standard: American / ANSI compatible four-way mirror (US standard options).
  • Pressure: Typical configs up to 160 bar (≈2320 psi), depending on body/flange.
  • Temperature: Borosilicate up to ≈280°C; quartz up to ≈500°C.
  • Connections: ANSI flanges (up to 1500 LB), DIN to PN16/25/40, weld-in or threaded.
  • Options: rotor, flap, viewing lamps, safety seal, heating jacket.

Typical specifications

Typical specifications (example)

Model LMX-974 / Four-Way Mirror (ANSI)
Operating pressure 16 to 40 bar; configurable up to 160 bar per design
Operating temperature Borosilicate glass: ~150° or 280°C ; Quartz glass: up to ~500°C
Materials Housing: carbon steel / SS304 / SS316 / special alloys. Glass: borosilicate (DIN7080), soda-lime (DIN8902), or quartz glass
Connections ANSI flanges (up to 1500 LB), DIN PN16/25/40, weld-in, internal thread
Sizes (DN → L / d1 / d2) DN15   L=130   d1=32   d2=45;

DN20   L=150   d1=32   d2=45;

DN25   L=160   d1=48   d2=63;

DN32   L=180   d1=48   d2=63;

DN40   L=200   d1=65   d2=80;

DN50   L=230   d1=80   d2=100;

DN65   L=290   d1=80   d2=100;

DN80   L=310   d1=100   d2=125;

DN100   L=350   d1=125   d2=150
Certificates (option) EN 10204-2.2, EN 10204-3.1, or customer certificates on request
Need a tailored configuration or full datasheet? Contact us for a quote.

Features & benefits

  • Full junction visibility: Inspect flow and level across a 4-port junction without disassembly.
  • ANSI compatibility: Direct retrofit to ANSI-drilled flanges simplifies replacement.
  • Material & glass options: Match body and glass to media, temperature and pressure.
  • Serviceable: Replaceable glass plates and gaskets reduce downtime.

Downloads

FAQ

1. What glass is best for high temperatures?
Quartz  glass is best for extreme temperatures (up to ~500°C). For most high-temp uses, borosilicate at an appropriate thickness is a cost-effective choice
2. Can you supply ANSI 1500 LB flanges?
Yes. We manufacture ANSI-drilled flanges up to 1500 LB on request — specify the flange class when you order
3. Is the four-way mirror serviceable?
Yes. Glass plates and gaskets are replaceable. We supply spare glass kits and gaskets for on-site maintenance.

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