Instrument Needle Valves
Instrument needle valves give manual flow adjustment and shut-off in small-bore process, sampling, gauge and analyser lines. A stem with a tapered or regulating tip is driven into the seat by a fine-pitch thread, so flow can be adjusted gradually as well as isolated. TSI sources instrument needle valves against your specification (body material, bonnet design, stem tip and packing, end connections, pressure, flow capacity and documentation) through qualified manufacturers and stockists.
Technical values shown are representative ranges across comparable manufacturer series and must not be interpreted as the combined rating of a single valve configuration. Maximum pressure, maximum temperature and flow capacity are not simultaneous ratings. Exact ratings are confirmed against the selected manufacturer, size, material, packing and end connections.
Pressure class is not fixed by bonnet type. Standard severe-service union, screwed and locked-bonnet designs are typically rated up to 6,000 psig; selected union, forged and locked-bonnet designs are also made for 10,000 psig and are listed in family C.
Images on this page are representative illustrations of each product type, not photographs of supplied items.
| Code | Type | Max. pressure at 100°F | Temperature | Size | Body material | Cv |
|---|---|---|---|---|---|---|
| TSI-11-001 | Integral bonnet, straight | 6,000 psig (414 bar) | -65°F to 450°F | 1/8 in. to 3/4 in. | 316 SS; brass, Alloy 400 on selected series | 0.09 to 0.73 |
| TSI-11-002 | Integral bonnet, angle | 5,000 psig (345 bar); 6,000 on selected series | -65°F to 450°F | 1/8 in. to 3/4 in. | 316 SS; Alloy 400, brass, steel (lower rating) | 0.09 to 1.8 |
| TSI-11-003 | Integral bonnet, panel-mounting | 5,000 psig (345 bar) | -65°F to 450°F; PEEK to 600°F | 1/8 in. to 3/4 in. | 316 SS; brass, Alloy 400 | Confirmed per model |
| TSI-11-004 | Union bonnet, straight | 6,000 psig (414 bar) | -65°F to 450°F; graphite to 1,200°F | 1/8 in. to 1 in. | 316 SS; Alloy 400, C-276, titanium on request | 0.35 to 2.4 |
| TSI-11-005 | Union bonnet, angle | 6,000 psig (414 bar) | -65°F to 450°F; graphite to 1,200°F | 1/4 in. to 1 in. (selected) | 316 SS; Alloy 400, C-276, titanium on request | 0.35 to 2.4 |
| TSI-11-006 | Screwed bonnet, straight | 6,000 psig (414 bar) | -65°F to 450°F; graphite to 1,200°F | 1/8 in. to 1 in. | 316 SS, C-276, Alloy 400, titanium, brass | 0.35 upward |
| TSI-11-007 | Locked bonnet, straight | 6,000 psig (414 bar) | -100°F to 1,200°F by packing (PTFE 450°F) | 1/8 in. to 1 in. | 316 SS, Alloy 400, C-276 | 0.34 to 2.18 |
| TSI-11-008 | High pressure, straight | 10,000 psig (689 bar) | -65°F to 450°F; graphite to 1,200°F at lower pressure | 1/8 in. to 3/4 in. (mostly 1/4 to 1/2) | 316 SS; carbon steel on selected ranges | 0.3 to 1.8 |
| TSI-11-009 | High pressure, angle (selected) | 10,000 psig (689 bar), confirmed per model | -65°F to 450°F; graphite to 1,200°F at lower pressure | 1/8 in. to 3/4 in. (mostly 1/4 to 1/2) | 316 SS; carbon steel on selected ranges | 0.3 to 1.8 |
Family ranges for comparison only, not simultaneous ratings. Exact pressure, temperature and flow are confirmed against the selected model, size, material and end connections.
Instrument Needle Valves — Technical Catalogue
Download the TSI-11 catalogue covering nine illustrated needle valve designs, including bonnet configurations, connections, materials, pressure guidance and dimensional reference views. Images are representative; final ratings and dimensions are confirmed for the selected manufacturer and order configuration.
A. Integral-Bonnet Needle Valves
The bonnet is an integral part of the body, with no separate bonnet joint. Compact and economical for general instrumentation, gauge and sampling isolation and flow adjustment.
| Working pressure | Up to 6,000 psig (414 bar) in 316 stainless steel at 100°F (38°C), depending on series; common series are rated 3,000, 5,000 or 6,000 psig. Soft-seat versions and non-stainless body materials may be rated lower. Exact rating is confirmed by manufacturer and configuration. |
|---|---|
| Temperature | -65°F to 450°F (-54°C to 232°C) with PTFE or PFA packing. PEEK packing raises the upper limit to between 500°F and 600°F (260°C to 316°C), by manufacturer. Soft-seat (PCTFE) tip limits vary by design (published maxima in the reviewed ranges are 200°F (93°C) and 350°F (177°C)); UHMWPE packing to 250°F (121°C) |
| Size | 1/8 in. to 3/4 in., by range |
| Body material | 316 stainless steel; brass and Alloy 400 in some ranges; other alloys on request |
| Stem tip and packing | Vee, regulating or soft-seat (PCTFE) stem tips; PTFE or PFA packing, with PEEK or UHMWPE optional by range |
| Flow coefficient (Cv) | Approximately 0.09 to 1.9, by orifice size (approximately 0.08 in. to 0.39 in., or 2 mm to 10 mm). End connections can restrict flow below the valve Cv |
| Patterns | Straight and angle; panel-mounting versions in many ranges |
| End connections | Compression tube fittings, female and male NPT, ISO/BSP tapered threads, by range |
Representative image — the item supplied is sourced to the approved drawing and specification, confirmed at order.
TSI-11-001Needle Valve, Integral Bonnet, Straight Pattern
One-piece body with the bonnet machined into it, so there is no separate bonnet joint to loosen. A compact valve for isolation, venting and fine adjustment in gauge, sampling and impulse lines.
| Size | Tube ends 1/8 in. to 3/4 in. (reference: 1/4 in. tube x 1/4 in. tube); NPT and ISO/BSP taper threads; tube x thread combinations |
|---|---|
| Pressure | Up to 6,000 psig (414 bar) at 100°F (38°C) in 316 stainless steel on the 6,000 psig series; 5,000 and 3,000 psig series also exist. Soft-seat tips and connections can lower the rating |
| Temperature | -65°F to 450°F (-54°C to 232°C) with vee tip and PTFE or PFA packing; soft-seat (PCTFE) tip to 200°F (93°C) on the reviewed ranges; PEEK packing to 500-600°F on selected series |
| Body material | 316 stainless steel; brass and Alloy 400 on selected series, at lower pressure |
| Orifice / Cv | Approx. 0.08 in. to 0.25 in. (2 mm to 6.4 mm); Cv approx. 0.09 to 0.73 on the 6,000 psig range |
| Tip / packing | Vee, regulating or soft-seat tip; chevron PTFE or PFA packing |
| Handle | Bar (T) handle |
Representative image — the item supplied is sourced to the approved drawing and specification, confirmed at order.
TSI-11-002Needle Valve, Integral Bonnet, Angle Pattern
Integral-bonnet valve with the outlet at 90 degrees to the inlet, for lines that turn or where a straight valve will not fit. Same one-piece body and packing as the straight pattern.
| Size | Tube ends 1/8 in. to 3/4 in. (reference: 1/8 in. tube x 1/8 in. tube); female and male NPT; ISO/BSP taper threads |
|---|---|
| Pressure | Up to 5,000 psig (345 bar) at 100°F in 316 stainless steel on the reference series; 6,000 psig on selected series; Alloy 400, brass and steel versions are rated lower |
| Temperature | -65°F to 450°F with PFA packing; UHMWPE packing to 250°F; PEEK packing to 600°F; PCTFE soft-seat tip to 200°F |
| Body material | 316 stainless steel; Alloy 400, brass or steel on selected series |
| Orifice / Cv | 0.080 in. (2.0 mm), Cv 0.09 on the 1/8 in. valve; up to 0.375 in. (9.5 mm), Cv 1.8 across the range |
| Tip / packing | Regulating (reference), vee or soft-seat tip; PFA, UHMWPE or PEEK packing |
| Handle | Round black phenolic handle standard; stainless steel or aluminium bar handle optional |
Representative image — the item supplied is sourced to the approved drawing and specification, confirmed at order.
TSI-11-003Needle Valve, Integral Bonnet, Panel-Mounting
Integral-bonnet valve supplied with a panel nut: the bonnet passes through a cut-out and the handle operates from the front of an instrument panel or enclosure.
| Size | Tube and pipe ends 1/8 in. to 3/4 in.; tube fittings, male and female NPT, ISO/BSP threads |
|---|---|
| Panel | Panel thickness typically 1/8 in. to 1/4 in. (3.2 mm to 6.4 mm); cut-out size from the confirmed model drawing |
| Pressure | Up to 5,000 psig (345 bar) at 100°F in 316 stainless steel on the common panel-mount ranges; lower for brass and Alloy 400 |
| Temperature | -65°F to 450°F with PTFE packing; up to 600°F with PEEK packing |
| Body material | 316 stainless steel; brass and Alloy 400 |
| Tip / packing | Vee (standard), regulating or soft-seat (PCTFE) tip |
| Handle | Round or bar handle, by series |
B. Union, Screwed and Locked-Bonnet Needle Valves
Severe-service designs with a separate bonnet, larger orifices and, on selected designs, packing located below the stem threads and a non-rotating stem. Union, screwed and locked bonnets are different constructions: a union bonnet is joined to the body by a union nut, a screwed bonnet is threaded into the body, and a locked bonnet is threaded and then retained by a separate locking device.
| Working pressure | Up to 6,000 psig (414 bar) in 316 stainless steel at 100°F (38°C), depending on series, for standard severe-service designs (10,000 psig designs are listed in family C). Alloy 400 is rated lower (about 5,000 psig / 345 bar) and titanium about 3,500 psig (241 bar) on selected ranges. Exact rating is confirmed by manufacturer and configuration. |
|---|---|
| Temperature | -65°F to 450°F (-54°C to 232°C) with PTFE packing. Flexible graphite packing raises the upper limit to 1,200°F (649°C) on selected configurations, with the pressure rating reduced at temperature; PEEK packing 500°F to 600°F (260°C to 316°C), by manufacturer. Soft-seat (PCTFE) tip limits vary by design (published maxima in the reviewed ranges are 200°F (93°C) and 350°F (177°C)) |
| Size | 1/8 in. to 1 in., by range |
| Body material | 316 stainless steel; Alloy 400, Alloy C-276 and titanium in some ranges, sourced on request |
| Stem tip and packing | Vee, regulating or soft-seat stem tips; ball-tip option on selected ranges; PTFE, PEEK or flexible graphite packing |
| Flow coefficient (Cv) | Approximately 0.3 to 3.6, by orifice size (approximately 0.16 in. to 0.44 in., or 4 mm to 11 mm); larger on some designs |
| Patterns | Straight and angle, by range |
| End connections | Compression tube fittings, female and male NPT, ISO/BSP tapered threads, by range |
Representative image — the item supplied is sourced to the approved drawing and specification, confirmed at order.
TSI-11-004Needle Valve, Union Bonnet, Straight Pattern
Severe-service valve with a separate bonnet joined to the body by a union nut. The bonnet resists loosening under vibration and pressure pulsation, and the valve can be repacked without removing it from the line. Many designs add a non-rotating stem, back-seating and packing below the stem threads.
| Size | Tube ends 1/8 in. to 1 in. (reference: 1/2 in. tube x 1/2 in. tube); NPT and ISO/BSP taper threads |
|---|---|
| Pressure | Up to 6,000 psig (414 bar) at 100°F in 316 stainless steel; Alloy 400 about 5,000 psig and titanium about 3,500 psig on selected ranges |
| Temperature | -65°F to 450°F with PTFE packing; PEEK to 600°F; flexible graphite to 1,200°F (649°C) on selected configurations, with pressure reduced at temperature |
| Body material | 316 stainless steel; Alloy 400, Alloy C-276 and titanium on selected ranges, sourced on request |
| Orifice / Cv | Approx. 0.16 in. to 0.44 in. (4 mm to 11 mm); Cv approx. 0.35 to 2.4 (0.86 on a 1/2 in. tube valve with a 6.4 mm orifice) |
| Tip / packing | Regulating, vee or soft-seat tip; ball tip on selected ranges; PTFE, PEEK or graphite packing |
| Test / options | Factory nitrogen leak test and hydrostatic shell test at 1.5 x working pressure on the reviewed range; sour-gas configuration to ANSI/NACE MR0175 / ISO 15156 on selected models |
Representative image — the item supplied is sourced to the approved drawing and specification, confirmed at order.
TSI-11-005Needle Valve, Union Bonnet, Angle Pattern
Union-bonnet severe-service valve with the outlet at 90 degrees to the inlet. Angle patterns are made on selected sizes of each range; the rating and flow data of the angle configuration are confirmed per model.
| Size | Tube ends 1/4 in. to 1 in. on selected sizes; NPT and ISO/BSP taper threads |
|---|---|
| Pressure | Up to 6,000 psig (414 bar) at 100°F in 316 stainless steel; Alloy 400 about 5,000 psig and titanium about 3,500 psig on selected ranges |
| Temperature | -65°F to 450°F with PTFE packing; PEEK to 600°F; flexible graphite to 1,200°F (649°C) on selected configurations, with pressure reduced at temperature |
| Body material | 316 stainless steel; Alloy 400, Alloy C-276 and titanium on selected ranges, sourced on request |
| Orifice / Cv | Approx. 0.16 in. to 0.44 in. (4 mm to 11 mm); Cv approx. 0.35 to 2.4 (0.86 on a 1/2 in. tube valve with a 6.4 mm orifice) |
| Tip / packing | Regulating, vee or soft-seat tip; ball tip on selected ranges; PTFE, PEEK or graphite packing |
| Test / options | Factory nitrogen leak test and hydrostatic shell test at 1.5 x working pressure on the reviewed range; sour-gas configuration to ANSI/NACE MR0175 / ISO 15156 on selected models |
Representative image — the item supplied is sourced to the approved drawing and specification, confirmed at order.
TSI-11-006Needle Valve, Screwed Bonnet, Straight Pattern
The bonnet is threaded directly into the body and the packing is adjusted from outside. Bar-stock screwed-bonnet valves accept a wide range of tips, packings and welded or threaded ends, including special alloys.
| Size | 1/8 in. to 1 in.; tube, NPT and ISO/BSP threads, with tube or pipe weld ends on selected ranges; the rating falls as connection size increases |
|---|---|
| Pressure | Up to 6,000 psig (414 bar) at 100°F in 316 stainless steel and Alloy C-276; Alloy 400 about 5,000 psig; titanium about 3,500 psig; brass about 3,000 psig |
| Temperature | -65°F to 450°F with PTFE packing; PEEK to 500°F; flexible graphite to 1,200°F on selected ranges |
| Body material | 316 stainless steel, Alloy C-276, Alloy 400, titanium and brass on the reference range; further alloys sourced on request |
| Orifice / Cv | Approx. 0.16 in. to 0.71 in. (4 mm to 18 mm); Cv from approx. 0.35 upward, by size |
| Tip / packing | Taper, regulating, ball or soft-seat tip; PTFE, PEEK or graphite packing |
Representative image — the item supplied is sourced to the approved drawing and specification, confirmed at order.
TSI-11-007Needle Valve, Locked Bonnet, Straight Pattern
A threaded bonnet retained by a separate locking device, so it cannot unscrew under vibration, thermal cycling or frequent operation. Used on process, steam and test lines where bonnet loosening is a safety concern.
| Size | 1/8 in. to 1 in. and 6 mm to 12 mm; NPT and ISO/BSP threads, tube ends, tube or pipe socket weld (reference: 1/4 in. female NPT x 1/4 in. female NPT) |
|---|---|
| Pressure | Up to 6,000 psig (414 bar) at 100°F (38°C) |
| Temperature | -100°F to 1,200°F depending on packing and tip: PTFE to 450°F, PEEK to 600°F, soft-seat (PCTFE) tip to 200°F |
| Body material | 316 stainless steel, Alloy 400 or Alloy C-276 body and stem; further alloys sourced on request |
| Orifice / Cv | Approx. 0.16 in. to 0.44 in. (4 mm to 11 mm); catalogue Cv approx. 0.34 to 2.18. Threaded ends can reduce this: 0.78 is published for a 1/4 in. female NPT valve with a 0.25 in. orifice |
| Tip / packing | Vee, metering, regulating or soft-seat tip; PTFE, graphite or PEEK packing |
| Handle | Stainless steel T-bar handle (reference) |
C. High-Pressure Needle Valves
For pressures above the standard severe-service range, up to 10,000 psig on selected documented models. Heavier bodies with back-seated, non-rotating stems on many designs. Straight pattern in most ranges; angle on selected ranges.
| Working pressure | Up to 10,000 psig (689 bar) in 316 stainless steel at 100°F (38°C), on selected documented models. The rating falls with temperature and depends on material, end connection and tube; the rating at operating temperature is confirmed by manufacturer and configuration. |
|---|---|
| Temperature | -65°F to 450°F (-54°C to 232°C) with PTFE packing. Flexible graphite packing raises the upper limit on selected configurations, with a much lower pressure rating at high temperature. Carbon steel versions: -20°F to 350°F (-29°C to 177°C) |
| Size | 1/8 in. to 3/4 in.; most ranges 1/4 in. to 1/2 in. |
| Body material | 316 stainless steel; carbon steel on selected ranges; other alloys on request |
| Stem tip and packing | Non-rotating vee or regulating stem tips; PTFE or flexible graphite packing |
| Flow coefficient (Cv) | Approximately 0.3 to 1.8, by orifice size (approximately 0.16 in. to 0.39 in., or 4 mm to 10 mm) |
| Patterns | Straight; angle on selected ranges, with the rating of an angle configuration confirmed per model |
| End connections | Compression tube fittings, female and male NPT, ISO/BSP tapered threads, by range |
Representative image — the item supplied is sourced to the approved drawing and specification, confirmed at order.
TSI-11-008High-Pressure Needle Valve, Selected 10,000 psig Designs, Straight Pattern
Heavier body for pressures above the standard severe-service range, typically with a non-rotating, back-seated stem. Selected designs are documented to 10,000 psig; the rating at temperature depends on material, connection and tube.
| Size | 1/8 in. to 3/4 in.; most ranges 1/4 in. to 1/2 in., NPT or tube ends |
|---|---|
| Pressure | Up to 10,000 psig (689 bar) at 100°F (38°C) in 316 stainless steel on selected documented models. The rating falls with temperature, so the rating at operating temperature is confirmed per model |
| Temperature | -65°F to 450°F with PTFE packing; flexible graphite to 1,200°F on selected configurations at much lower pressure; carbon steel versions -20°F to 350°F |
| Body material | 316 stainless steel; carbon steel on selected ranges; other alloys on request |
| Orifice / Cv | Approx. 0.16 in. to 0.39 in. (4 mm to 10 mm); Cv approx. 0.3 to 1.8 |
| Tip / packing | Non-rotating vee or regulating tip; PTFE or graphite packing |
Representative image — the item supplied is sourced to the approved drawing and specification, confirmed at order.
TSI-11-009High-Pressure Needle Valve, Selected 10,000 psig Designs, Angle Pattern
Angle pattern on selected 10,000 psig designs, for lines that turn. The rating of an angle configuration is confirmed per model, as it can differ from the straight pattern.
| Size | 1/8 in. to 3/4 in.; most ranges 1/4 in. to 1/2 in., NPT or tube ends |
|---|---|
| Pressure | Up to 10,000 psig (689 bar) at 100°F (38°C) in 316 stainless steel on selected documented models. The rating falls with temperature, so the rating at operating temperature is confirmed per model |
| Temperature | -65°F to 450°F with PTFE packing; flexible graphite to 1,200°F on selected configurations at much lower pressure; carbon steel versions -20°F to 350°F |
| Body material | 316 stainless steel; carbon steel on selected ranges; other alloys on request |
| Orifice / Cv | Approx. 0.16 in. to 0.39 in. (4 mm to 10 mm); Cv approx. 0.3 to 1.8 |
| Tip / packing | Non-rotating vee or regulating tip; PTFE or graphite packing |
Needle valves above 10,000 psig are a separate medium- and high-pressure product group and are not shown here.
D. Special Service and Options
Specified in your enquiry and available through sourcing on request. Availability depends on the manufacturer, range and model.
- Sour-gas service: a requirement confirmed against the ordered model, material and documentation (ANSI/NACE MR0175 / ISO 15156).
- Special cleaning for oxygen-enriched service (ASTM G93 Level C) where offered for the selected model.
- Low fugitive emissions: API 624 type-test certification on selected ranges; certificate availability is confirmed for the ordered configuration.
- Stem tip options: vee, regulating and soft-seat (PCTFE); ball tip on selected ranges.
- Higher-temperature packing: PEEK or flexible graphite, by range.
- Pneumatic actuation on selected severe-service ranges.
- Panel-mounting versions.
- Alternative body materials (Alloy 400, Alloy C-276, titanium) and other special alloys, sourced on request.
These are requirements to state in your enquiry, not options that are available together on one valve.
- Needle valves suit manual flow adjustment and isolation. They are not a substitute for a control valve in an automatic loop.
- Working pressure is the lowest applicable rating of the body, stem seal, tip, packing, end connection and tube, reduced for temperature. The maximum series pressure is not the working pressure of the installed valve.
- Stem tip sets the duty: vee tips for shut-off and general use, regulating tips for finer flow adjustment, soft-seat tips for sealing against a polymer seat. A maximum Cv does not describe adjustment quality; Cv versus turns is published for some series and requested per model.
- Packing sets the temperature range: PTFE or PFA to 450°F (232°C), PEEK 500°F to 600°F (260°C to 316°C), flexible graphite up to 1,200°F (649°C) on selected configurations. Graphite limits differ by series, size and alloy. Check tip and packing limits separately.
- Published Cv values are for the valve itself. End connections, especially small-bore tube ends, can restrict flow below the published Cv.
- NPT and ISO/BSP tapered threads are not interchangeable. State the thread standard and the end sex (male or female) for the inlet and outlet.
- Sour service needs material selection to ANSI/NACE MR0175 / ISO 15156, assessed against the actual conditions. State it in the enquiry.
- Oxygen-enriched service needs special cleaning. State it in the enquiry.
Send, for each item: duty (isolation or manual regulation) and required shut-off performance; working and design pressure, minimum and maximum design temperature, and process fluid (including chlorides, H2S, CO2 or oxygen where present); body material and grade, with wetted parts if different; bonnet type; stem tip and packing; pattern (straight, angle, panel-mounting); inlet and outlet connection (thread standard and sex, or tube outside diameter and wall thickness); required Cv and allowable pressure drop if critical; special requirements (sour service, cleaning, low emissions); documentation required (for example EN 10204 3.1 material certificates, traceability, test records, general arrangement drawing); quantity.
Small instrument valves of this type fall within the scope of MSS SP-99-2023 (steel and alloy instrument valves of NPS 2 and smaller, up to 15,000 psi at 100°F). The standard does not certify any individual product. Designs are generally manufacturer-proprietary, so dimensions and ratings are confirmed per supplier; MSS SP-99 refers code applications to MSS SP-105. Tapered NPT threads are to ASME B1.20.1 and ISO/BSP tapered threads to ISO 7-1 / EN 10226-1.