SSP offers needle and rising plug gauge valves in three port and block and bleed designs. Block and bleed valves are available with packed bonnet or non-packed vent valves. All packed bonnets feature live-loaded packing below the stem threads and non-rotating stems for better cycle life, lower maintenance and leak-tight shut off even in severe service conditions.

Needle Gauge Valves

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  • Temperature Range: -100 to 1200° F (-73 to 648° C)
  • Pressure Range: up to 6000 psig (413 bar)
  • Valve Orifice Sizes: 0.85
  • Cv: 0.250
  • Gauge Valve Types
    • Needle Gauge Valves
    • Rising Plug Gauge Valves
    • Two-Valve Block & Bleed Valves
    • Bleed Valve with Integral Bleed Ports
  • Body Materials: 316 SS, Alloy 400 and Alloy C-276
  • Packing Materials: PTFE, PEEK, Graphite
  • Stem types: Non-rotating vee and Soft seal (PCTFE), regulating and metering
  • End Connection Types: NPT, tube socket weld and pipe socket weld, male pipe,
    Duolok®, Griplok® and Unilok® tube ends
  • End Connection Sizes:
    • Inlet:  1/4, 1/2 and 3/4 in. 
    • Outlet:  1/4 and 1/2 in. 
    • Extended Inlets:  4 and 6 in.


Safer Bonnet Design
In the locked bonnet design, the bonnet is screwed into the valve body to seal on a metal to metal surface. The bonnet is locked in place with a ring, which is secured with a separate screw. This prevents accidental disassembly during packing adjustment, loosening due to vibration, or unscrewing of the bonnet by continuing to rotate the stem after it is fully open. The back-seating lower stem allows inline packing adjustments to be made more safely.

Better Non-Rotating Stem Tip Design
Unlike non-rotating ball stem tips, SSP gauge valves are designed with a non-rotating lower stem that prevents seat damage and reduces wear to the seat and packing. The threaded upper stem and stem pivot are located above the packing to prevent system media from attacking the threads, washing away thread lubricants or clogging, or corroding the non-rotating stem mechanism. This ensures that the stem tip will not rotate even in severe conditions.

Leak-Tight Reliability and Low Maintenance
The tighter your system, the better your data. SSP gauge valves are designed with live loaded packing that provides a dynamic leak-tight stem seal, which compensates for changes in pressure, temperature and packing wear.

Gauge Valve Types

LNG Series are 3-port needle gauge valves with LN Series isolation bonnets and three outlet ports. Non-rotating vee-tip stem provides a durable metal to metal seal.  Soft seal PCTFE steel tips are also available.

LNBB Series are block and bleed valves featuring LN Series bonnets for both isolation and bleed functions to allow safer maintenance of instruments in systems with hazardous media. 

LNBP Series are block and bleed valves featuring an LN Series isolation valve and an integral bleed port to allow maintenance of instruments having non-hazardous media.

LPG Series are rising plug 3-port gauge valves with LN Series isolation bonnets and three outlet ports. They feature a rising plug and soft seat design with a straight-through flow path that allows rodding

Locked Bonnet Gauge Valves Types


Flexible Graphite Packing

PTFE packing is standard for LN Series valves. Flexible graphite packing is available for high-temperature applications.

Body Materials

  • 316 Stainless Steel
  • Alloy 400
  • Alloy C-276

Lagging (Extended Inlet)

LN Series Gauge Valves and Rising Plug Gauge Valves are available with 4 in. lagging.

Tube End Connections

In addition to end connections offered in the Basic Part Number and Dimensions table, SSP can provide Duolok, Griplok and Unilok tube end connections.

Bleed Valves and Plugs

Bleed valves and pipe plugs can be ordered installed or shipped loose with gauge valves.

Special Cleaning

SSP Gauge valves are available cleaned in compliance with ASTM G93 Level C and CGA G-4.1, Cleaning Methods and Cleanliness Levels for Material and Equipment Used in Oxygen-Enriched Environments. To specify, add -XP98 to the part number.
For more information about other types of special cleaning, please contact your local SSP distributor or SSP Customer Service.

Sour Gas

Selecting valves for sour gas applications requires the consideration of several factors including the temperature, pH, partial pressure of H2S, and whether the application is
above or below ground. SSP offers four configurations to meet the requirements in NACE MR0175/ISO 15156-3 and NACE MR0103. To order gas for you application add the designator below to the part number.
Example: LNG6V-8PM-8PF-316-SG2

Designator Body MaterialWetted Parts1Non-Wetted Pressure Containing Parts
DesignatorSG1 Body Material316 SS Wetted Parts1Annealed 316 SS except body2 Non-Wetted Pressure Containing Parts316 SS
DesignatorSG2 Body Material316 SS Wetted Parts1Annealed 316 SS Non-Wetted Pressure Containing Parts316 SS
DesignatorSG3 Body MaterialAlloy 400 Wetted Parts1Alloy 400/UNS S20910 Non-Wetted Pressure Containing Parts316 SS
DesignatorSG4 Body MaterialAlloy 400 Wetted Parts1Alloy 400/UNS S20910 Non-Wetted Pressure Containing PartsAlloy 400

1Springs or other component may require other materials for

2Compression fittings and valve bodies with compression fitting ports are exempt from lower hardness requirements per ANSI/NACE MR0175/ISO 15156 and NACE MR0103.