Needle Valves · Rising Plug Gauge Valves
High Pressure Rising Plug Gauge Valves
High pressure rising plug gauge valves are the panel-and-instrument execution of the needle family: the plug rises fully out of the flow path on opening, giving straight-through bidirectional flow, high capacity and roddability, while the back-seating stem tip lets packing be adjusted inline under pressure. The benchmark page rates the execution to 6,000 psig (413 bar) and -65 to 400 F (-73 to 204 C), with 0.187 in (Cv 0.85) and 0.250 in (Cv 1.65) orifices, bodies in 316 SS and Alloy 400, PTFE and PEEK packing, Acetal, PFA and PEEK seats, 1/4 to 3/4 in NPT inlets with 2 in extended inlet options and 1/4 to 1/2 in NPT outlets.
Part of the Rising Plug Gauge Valves family
Last updated: 2026-11
Specifications
| temperature range | -65 to 400 °F (-73 to 204 °F) |
|---|---|
| pressure class | up to 6,000 psig (413 bar) |
| orifice options small | 0.187 in orifice (max Cv 0.85) |
| orifice options large | 0.250 in orifice (max Cv 1.65) |
| body materials | 316 SS, Alloy 400 |
| packing materials | PTFE (standard), PEEK |
| seat materials | Acetal, PEEK, PFA |
| inlet connections | 1/4 NPT, 1/2 NPT, 3/4 NPT |
| extended inlets | 2 in extended inlets available |
| outlet connections | 1/4 NPT, 1/2 NPT |
| sour gas option | Sour gas materials to NACE MR0175 / ISO 15156 available (-SG option) |
| flow feature | Bidirectional straight-through flow; rising plug fully exits the bore; back-seating stem tip for inline packing adjustment |
Application & selection guidance
Select this execution for gauge, panel and instrument takeoffs where the valve spends most of its life open and must present minimal pressure drop - the rising plug gives a straight-through path that a conventional needle valve cannot. Specify PFA or PEEK seats against aggressive media, PEEK packing where service temperature excludes PTFE, and 2 in extended inlets for lagged or hot pipework. Sour gas service to NACE MR0175 / ISO 15156 and special cleaning to ASTM G93 Level C are orderable options.
Frequently asked questions
What does the rising plug do that a conventional needle stem does not?
The plug lifts completely out of the bore, leaving a straight-through, bidirectional flow path - high capacity, low pressure drop, and a passage that can be rodded clean. A needle stem always partly obstructs the orifice. The back-seating stem tip additionally isolates the packing while the valve is open, so packing can be adjusted inline under pressure.
Which flow coefficients do the two orifice sizes give?
The benchmark page lists a 0.187 in orifice at a maximum Cv of 0.85 and a 0.250 in orifice at a maximum Cv of 1.65. Size the orifice from the required instrument bleed or gauge flow - the larger orifice doubles capacity but reduces control fineness.
What material options apply at temperature extremes?
The execution is rated -65 to 400 F (-73 to 204 F per the benchmark listing). PTFE packing is standard with PEEK for higher temperature or extrusion resistance; seats come in Acetal, PFA and PEEK, so aggressive media can be matched with a fluoropolymer seat while keeping the 316 SS or Alloy 400 body. Sour gas materials to NACE MR0175 / ISO 15156 and ASTM G93 Level C special cleaning are orderable options.
Ordering & documentation
Documents
Ask for the documentation set you need with the inquiry — typical items for this execution (material certificates, test reports to the listed inspection standard, dimensional drawings) are confirmed and supplied with the quotation.
Quotation
A quotation-ready inquiry states: nominal size and pressure rating, body and seat material preference, end connection, operation, and the service medium with temperature. Typical values on this page are benchmark reference ranges; the binding values are confirmed at quotation.
Sample & supply
Supply terms, order quantities and lead time are agreed per order — state the destination country and required schedule with the inquiry.
Storage & shipping
Store valves with seats and seals protected from UV, ozone and deformation, keep end-face protectors on until installation, and for elastomer- or PTFE-seated executions avoid prolonged outdoor storage — seat compounds age fastest in direct sunlight and freezing conditions.
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