DN15-PN40-NPT c/w Nipples SS Needle Valve
DN15-PN40-NPT c/w Nipples SS Needle Valve - Image 2
DN15-PN40-NPT c/w Nipples SS Needle Valve - Image 3
DN15-PN40-NPT c/w Nipples SS Needle Valve - Image 4

DN15-PN40-NPT c/w Nipples SS Needle Valve

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Description

Stainless Steel Needle Valve – Technical Data Sheet

Size: DN15 | Pressure: PN40 | Connection: NPT with Nipples

Item Specification
Product Name Needle Valve, Integral Bonnet, Non‑rotating Stem
Nominal Size DN15 (1/2″)
Pressure Rating PN40 (4.0 MPa / 40 bar / 580 psi)
Connection Type Female NPT (both ends) c/w Nipples – two stainless steel male NPT nipples included (threaded both ends)
Nipple Specification 1/2″ NPT male × 1/2″ NPT male, length ~50–80 mm (as specified)
Body Material Stainless Steel (SS304 / SS316)
Stem Tip Metal‑to‑metal (sharp needle) or soft tip (PTFE/PEEK) optional
Packing PTFE or Grafoil (graphite)
Handle Type Phenolic knob or metal T‑handle
Temperature Range -29°C ~ +200°C (PTFE packing) / -29°C ~ +400°C (graphite packing)
Applicable Media Water, oil, gas, steam, chemicals, instrumentation fluids

1. Main Parts & Materials (All Stainless Steel)

Component Material (Standard) Optional Material
Body SS316 (forged) SS304, Monel, Hastelloy
Stem SS316 (rolled threads) SS316 with Stellite tip, Monel
Stem Tip Integral 316 (sharp angle) PTFE, PEEK, Vespel
Packing PTFE (chest) Flexible graphite, Grafoil
Packing Nut SS304 / SS316 –
Handle Phenolic black knob SS T‑handle, lockable handle
Nipples (included) SS316 seamless tube, NPT male both ends SS304, length custom
Gland / Bonnet SS316 (integral or threaded) –

2. Dimensions & Weight (Reference – Valve Body Only, without Nipples)

Dimension mm (approx.) inch (approx.)
End Connection (valve) 1/2″ NPT female –
Overall Length (valve body) 65 – 80 2.56 – 3.15
Height (handle up) ~110 – 130 –
Hex flats (body) 22 mm (AF) 7/8″
Panel mounting (optional) 35 mm centre distance –
Weight (valve only) ~0.3 – 0.5 kg ~0.7 – 1.1 lbs
Weight (with 2 nipples) ~0.6 – 0.9 kg –

Note: Nipple length is typically 50 mm (2″) each unless specified otherwise.

3. Design Features

  1. Non‑rotating Stem – Prevents galling and extends seat/packing life; stem moves axially without rotation.

  2. Metal‑to‑Metal Seating (Standard) – Sharp needle tip provides fine flow control and positive shut‑off (bubble‑tight).

  3. PTFE Packing – Low friction, good chemical resistance, suitable up to 200°C. Graphite packing available for high temperature.

  4. Integral Bonnet Construction – Reduces potential leak paths; robust for high‑pressure applications.

  5. Included Nipples – Valve is supplied with two stainless steel male NPT nipples for easy connection to piping or tubing.

  6. Fine Flow Regulation – Needle profile allows precise, repeatable flow adjustment from fully closed to fully open.

4. Performance Characteristics

Parameter Value
Cv (full open) ~0.8 – 1.2 (depending on orifice)
Orifice diameter 6 mm (typical for DN15 needle valve)
Maximum working pressure 4.0 MPa (PN40) at ambient temperature
Temperature derating Reduce pressure by 1% per °C above 200°C (for PTFE packing)
Leakage rate Zero detectable leakage (metal seat) per API 598

5. Applications

  • Instrumentation panels (pressure gauges, transmitters, switches)

  • Chemical injection lines

  • Sample points

  • Bleed and vent ports

  • High‑pressure hydraulic and pneumatic systems

  • Steam tracing lines (with graphite packing)

6. Testing & Compliance

Test Standard / Requirement
Hydrostatic shell test 1.5 × PN40 (6.0 MPa) – no leakage
Seat test (high pressure) 1.1 × PN40 (4.4 MPa) – zero leakage
Low pressure seat test 0.6 MPa – zero leakage (bubble‑tight)
Material traceability EN 10204 3.1 (optional)
Marking Body marked: DN15, PN40, SS, flow direction arrow (if applicable)

7. Nipples Specification (Included)

Parameter Value
Thread type NPT male (ASME B1.20.1)
Size 1/2″ NPT both ends
Material SS316 seamless tube
Length 50 mm standard (custom available)
Hex flat 22 mm (AF)
Wall thickness Sch 40 or Sch 80 (as specified)

Nipples are pre‑wrapped with PTFE tape or supplied without tape per customer request.

8. Ordering Information

Please specify:

  • Valve size: DN15 (1/2″)

  • Pressure: PN40

  • Connection: Female NPT + 2 matching male NPT nipples

  • Body material: SS316 / SS304

  • Stem tip: Metal / Soft (PTFE)

  • Packing: PTFE / Graphite

  • Handle: Knob / T‑handle

  • Nipple length: ___ mm

  • Special: Panel mounting, NACE MR0175, low‑emission packing, etc.

Notes:

  • “c/w Nipples” means the valve is supplied complete with two nipples, ready for installation.

  • For high‑temperature steam (>200°C), select graphite packing and metal stem tip.

  • Needle valves are not intended for full on/off isolation in high‑cycle applications; they are designed for flow regulation and shut‑off.

  • Confirm pressure‑temperature limits with the manufacturer for specific media.