Product Description

The Glass-Trac Type 3 Offset Gauge Valve has the Outside Screw & Yoke design which prevents excessively hot and corrosive fluids from contracting stem threads, causing possible malfunction. The stem backs directly off the regrindable valve seat using the positive, non-rotating stem principle. The valve is offset for ease in gauge cleaning and comes in both screwed (S) and a union (U) gauge as standard. On special order, tubular (T) gauge or other type connection can be supplied. Type 3 valves are used with Reflex and Transparent Gauges in working pressures up to 4000 psi.

The standard tank connection for Type 3 OS&Y Offset Gauge valves is a ¾” NPT solid shank, with optional ½” and 1” NPT sizes. Ends beveled for welding also are available. Valve materials include forged carbon steel and 316 stainless steel. A molded Teflon packing ring is standard at no extra cost in valves for services up to 450º F. For temperatures to 700º F, valves have wire-graphite packing. The Type 3 valve has stainless steel safety ball checks to shut off the flow automatically in case of gauge glass breakage.

Product Features

  • Heavy Duty Outside Screw & Yolk
  • 4000 psig CWP 6000 psig Test
  • ½”, ¾” (Std.) or 1” NPT or IPS Solid Shank Tank
  • Connection or Flanged Tank Connection
  • ½” NPT Female Gauge Connection
  • ½” NPT Female Drain Connection

Low Emissions Valve

The type 3A valve can be supplied with a package
that has been certified to the demanding API 624
Low Emissions Type Testing of Rising Stem Valves
Equipped with Graphite Packing for Fugitive Emissions

  • Certified to API 624 Low Emissions
    Standard, 1st Edition
  • Teadit Style 2236 Emissions Packing
    certified to API 622
  • USA forged valve body

Product Specifications

Type 3A gage valves are available in four basic gage
connection configurations:

  • Type 3A-S – With a rigid, ½” or ¾”, NPT or SW
    connection to the Level Gage
  • Type 3A-U – With a metal-to-metal union
    connection to the Level Gage
  • Type 3A-G – With a gasketed union connection to
    the level gage
  • Type 3A-T – Tubular gage connection to the level

Pressure & Temperature Rating

Teflon PackingWire-Graphite Packing
4000 psi100º F2950 psi500º F
3730 psi200º F2700 psi600º F
3470 psi300º F2430 psi700º F
3200 psi400º F


Compatible Products


100-00 Glass-Trac Liquid Level Gauges and Valves Catalog
Brochures, Product Line Brochure
120-53 3S/3U Valves
Technical Documents
130-01 Installation and Operating Instructions
Technical Documents
Vessel Connection Pipe Schedules on Questtec Valves
Technical Documents