Needle Valves · Locked Bonnet Needle Valves
High Pressure Straight Locked Bonnet Needle Valves
High pressure straight locked bonnet needle valves are the severe-service instrumentation execution: the bonnet locks against backscrew loosening, the non-rotating stem keeps the seat geometry true through every operation, and live-loaded packing holds the seal through pressure and thermal cycling. The benchmark page rates the execution to 6,000 psig (413 bar) and -100 to 1200 F (-73 to 648 C), with straight and angle patterns, metal seal stems in V, metering and regulating tips or PCTFE soft tips, bodies in 316 SS, Alloy 400 and Alloy C-276, orifice sizes 0.156 to 0.437 in, and 1/8 to 1/2 in end connections in NPT, socket weld and tube fitting forms.
Part of the Locked Bonnet Needle Valves family
Last updated: 2026-11
Specifications
| pressure class | Up to 6,000 psig (413 bar) |
|---|---|
| temperature range | -100 to 1200 °F (-73 to 648 °C) |
| patterns | Straight, Angle |
| stem options | Metal seal: V, Metering, Regulating, metering tip, Soft seal: PCTFE tip |
| body materials | 316 SS, Alloy 400, Alloy C-276 |
| packing materials | PTFE, Grafoil |
| orifice sizes | 0.156 in, 0.250 in, 0.437 in |
| end connection sizes | 1/8 to 1/2 in (6 to 12 mm tube fittings only) |
| end connections | NPT, Socket Weld, Tube Fitting |
Application & selection guidance
Select this execution for sample, injection, gauge and instrumentation lines in oil and gas, petrochemical and power service where pressures to 6,000 psig, temperatures from -100 to 1200 F, or sour/corrosive media exceed what general-purpose needle valves carry. Pick the stem tip against the duty - V tip for shutoff, metering and regulating tips for flow control, PCTFE soft tip where bubble-tight shutoff on gas matters - and the body alloy against the medium: 316 SS for general corrosion, Alloy 400 for hydrofluoric acid and seawater, Alloy C-276 for oxidizing acids and mixed contaminants.
Frequently asked questions
What does the locked bonnet contribute at high pressure?
The bonnet assembly locks so line vibration and operating torque cannot back the packing off the stem threads - at 6,000 psig a loose bonnet is a leak path, not an inconvenience. Combined with a non-rotating stem (so the seating tip does not lap against the seat on closing) and live-loaded packing, the execution keeps its seals through the pressure and thermal cycles typical of instrumentation service.
How do I choose between the stem tip options?
The benchmark page lists metal seal stems in V, metering, regulating and metering-tip forms plus a PCTFE soft tip. V tips serve general shutoff and coarse throttling, metering and regulating tips give fine flow control for sample and injection duties, and the PCTFE soft tip gives the tightest gas shutoff - at the cost of the pressure/temperature envelope of the soft tip material.
What end connections and orifice sizes does the range cover?
Orifice sizes 0.156, 0.250 and 0.437 in (3.96 to 11.1 mm), end connection sizes 1/8 to 1/2 in on tube fittings (6 to 12 mm), with NPT, socket weld and tube fitting end types. Larger orifices trade control fineness for flow capacity, so match the orifice to the controlled flow rather than defaulting to the largest.
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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