Jerguson® Tubular Glass Level Gages

Jerguson Gage & Valve offers a complete line of brass, bronze and stainless steel tubular glass gage valves for economical service.

The standard straight-through flow design features a durable cast aluminum wheel.  Connections of 1/2 or 3/4 inch NPT are available for attaching the valve to the vessel.

Highly durable Pyrex® gage glass is available with outside diameters of 5/8 or 3/4 inch.  Visibility lengths vary as required.  Guard rods are recommended to protect the glass from damage, and for added safety.

Valves for Tubular Glass Gages

These tubular glass gage cocks represent years of experience in the manufacture of gage cocks and offer a variety of types of connections to suit all requirements.  All have steel bodies with stainless steel trim.

Pressure Ratings

Maximum working pressure dependent on length and resultant pressure rating of glass.  See table at bottom of this page.

T 125
  • No. 125 Standard
  • 1/2 & 3/4 inch non-union rigid vessel connection
  • Straight pattern body
  • Plain closing stem
  • Stainless steel ballcheck to shut-off in the event of tube breakage
  • Valves can be used with 4 guard rods
S 136b
  • No. 136 Standard
  • 1/2 or 3/4 inch NPT union gage connection
  • Simplified bonnet
  • Plain closing stem only
  • Valves can be used with heavy duty plastic protector or 4 guard rods
  • Stainless steel ballcheck shut-off flow in event of tube breakage
  • Offset bodies to permit the swabbing of glass by removing plugs from vent and drain
R 56b
  • No. 56 Standard
  • 1/2 or 3/4 inch NPT union gage connection
  • Renewable regrindable stainless steel seat
  • Sleeve construction allows for optional:
    • Quick closing – 90° from full open to tight closing using lever and chain
    • Backseating stem to protect packing
  • Valves can be used with heavy-duty plastic protector or 4 guard rods
  • Stainless steel ballcheck shut-off flow in event of tube breakage
  • Offset bodies to permit the swabbing of glass by removing plugs from vent and drain

 

 

 

Bronze Gage Valves

Series VA Automatic

Model No. VA-991 5/8 inch Diameter Glass, 1/2 inch NPT Vessel Connection

Model No. VA-902 3/4 inch Diameter Glass, 3/4 inch NPT Vessel Connection

These tubular glass gage valves feature bronze body construction.  They come complete with corrosive-resistant ballchecks for automatic closure in the event of glass breakage.  This ensures safety and prevents the loss of fluid.  Maximum working pressure is 400 PSI @ 100°F, or 200 PSI @ 400°F.

Note: Pressure ratings will vary depending upon temperature, glass length and glass type. Refer to table at bottom for complete ratings.

Series VB Non-Automatic

Model No. VB-991 5/8″ Dia. Glass, 1/2″ NPT Vessel Conn.

Model No. VB-902 3/4″ Dia. Glass, 3/4″ NPT Vessel Conn.

These all bronze valves are similar to above models.  However, ballchecks are not standard, thus making operation non-automatic.  A 1/4″ needle drain valve in the lower unit accommodates a breakage condition.  Either a 1/4″ lower arm ball or a petcock is available upon request.  Sizes, packing materials and working pressures are identical to above models.

Series VC Automatic

Model No. VC-991 5/8″ Dia. Glass, 1/2″ NPT Vessel Conn.

Model No. VC-902 3/4″ Dia. Glass, 3/4″ NPT Vessel Conn.

Conforming to ASME power-boiler code requirements, these gage valves feature stainless steel ballchecks in both upper and lower units.  This provides automatic closure in the event of glass breakage and requires the ballcheck in the lower valve to rise vertically to its seat.  A safety handle is also provided for manual operation of the 5/16″ diameter drain valve.  This valve is of the full-flow ball valve design.

The valve body is constructed of rugged, heavy pattern bronze.  Standard packing materials are wear-resistant Teflon©  – PTFE.  Maximum working pressure is rated at 420 PSI @ 100°F, or 250 PSI @ 400°F.

Note: Pressure ratings will vary depending on temperature, glass length, and glass type.  Refer to table at bottom for complete ratings.

Series VE Non-Automatic

Model No. VE-991 5/8″ Dia. Glass, 1/2″ NPT Vessel Conn.

Model No. VE-902 3/4″ Dia. Glass, 3/4″ NPT Vessel Conn.

These gage valves are identical in every respect to above models, except for the non-automatic design.  Ballchecks are not included.

Note: Plastic protector enclosures are not available for the above glass gages.

 

Resources:

Brochure: Bronze Tubular Glass Valves (V-Series)

Liquid Level Valves For Tubular Glass Gages (125, 136, 56 Series)

IOM: Installation, Operation and Maintenance Instruction Tubular Gages

Drawings: 125 Tubular Safety Ballcheck Valve 1/2 inch MNPT X 5/8, 316 Stainless Steel

125 Tubular Safety Ballcheck Valve 1/2 inch MNPT X 5/8, Carbon Steel

125 Tubular Safety Ballcheck Valve 3/4 inch MNPT X 3/4, 316 Stainless Steel

125 Tubular Safety Ballcheck Valve 3/4 inch MNPT X 3/4, Carbon Steel

136 Series Tubular Safety Ballcheck Valve

56 Series Tubular Safety Ballcheck Valve

Tubular Glass Center Fitting