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Instrument Isolation Series

Needle Valves

Fine-control, bubble-tight instrument needle valves from 1/4" to 1" in OD × OD, male × female, female × female and angle patterns — rated up to 10000 PSI in SS 316, SS 304, Brass, Monel, Inconel and Hastelloy.

Stainless steel instrumentation needle valves
Up to 10000 PSIMax working pressure*
Product Overview

Instrumentation Needle Valves

A needle valve closes by driving a finely tapered stem tip into a matching seat through a fine-pitch thread. Many turns of the handle move the tip only a short distance, so the operator can throttle flow precisely and shut off positively against high pressure — ideal for isolating gauges, transmitters and sample points.

Kalpataru needle valves have a bar stock body, a back-seating stem that seals against the bonnet when fully open, and an adjustable gland so packing can be re-tightened in service without removing the valve. The bonnet is locked to the body to prevent accidental dismantling under pressure.

  • Bubble-tight metal seat
  • Fine flow regulation
  • Back-seating stem
  • Adjustable gland packing
  • Locked bonnet design
  • 100% pressure tested
Request a Quote View Dimensions
Connection Size1/4" to 1"
End ConnectionsNPT, BSP, Tube OD & others
Max Working Pressure3000 / 6000 / 10000 PSI
Body MaterialsSS 304 / 316 / 316L, Brass, Alloys
01
Types

Needle Valve Types

Straight Pattern

OD
Needle valve tube x tube (OD x OD)

OD × OD

Double ferrule compression ends on both sides, so the valve installs directly in a tubing run without separate connectors — fewer joints and fewer leak paths.

  • End Conn.TOD × TOD
  • Tube OD1/8" to 1.5" OD (Fractional)
    3 mm to 38 mm OD (Metric)
  • MountingPanel mounting arrangement on request
  • Test PressureUp to 10000 psi
  • Gland PackingStandard PTFE (Grafoil for high temp)
  • MOCSS 316, 304 / Brass / Alloy 400, 600, C276 / CS / PTFE
  • Model No.MOC*-NV-IN*-OUT*
MF
Male x female needle valve illustration

Male × Female

Male inlet screws straight into a process tapping or root valve; the female outlet takes a gauge, transmitter or fitting. The most common gauge isolation arrangement.

NPT / BSP Male × Female
FF
Needle valve female x female

Female × Female

Female threads on both ends for in-line isolation between two male nipples or fittings on impulse, drain and vent lines.

  • End Conn.FPT / MPT
  • Thread1/8" to 2" NPT (Taper); BSPP / BSPT / ISO / Metric on request
  • MountingPanel mounting arrangement on request
  • Test PressureUp to 10000 psi
  • Gland PackingStandard PTFE (Grafoil for high temp)
  • MOCSS 316, 304 / Brass / Alloy 400, 600, C276 / CS / PTFE
  • Model No.MOC*-NV-IN*-OUT*

Angle Pattern & Special Needle Valves

AT
Needle valve angle type

Angle Type

Inlet and outlet at 90° so the valve also acts as an elbow, saving a fitting and space. Flow enters under the seat for smooth throttling and easy cleaning of the port.

  • End Conn.TOD / FPT / MPT
  • Tube OD1/8" to 1.5" OD (Fractional)
    3 mm to 38 mm OD (Metric)
  • Thread1/8" to 2" NPT (Taper); BSPP / BSPT / ISO / Metric on request
  • Test PressureUp to 10000 psi
  • Gland PackingStandard PTFE (Grafoil for high temp)
  • MOCSS 316, 304 / Brass / Alloy 400, 600, C276 / CS
  • Model No.MOC*-NVA-IN*-OUT*
NVD
Needle valve with drain

Needle Valve with Drain

Needle valve with an integral drain / vent plug, so the downstream instrument can be depressurised without breaking a joint.

  • End Conn.TOD / FPT / MPT
  • Tube OD1/8" to 1.5" OD (Fractional)
    3 mm to 38 mm OD (Metric)
  • Thread1/8" to 2" NPT (Taper); BSPP / BSPT / ISO / Metric on request
  • Test PressureUp to 10000 psi
  • Gland PackingStandard PTFE (Grafoil for high temp)
  • MOCSS 316, 304 / Brass / Alloy 400, 600, C276 / CS / PTFE
  • Model No.MOC*-NVD-IN*-OUT*-DRAIN*
NVL
Needle valve lockable

Needle Valve Lockable

Lockable needle valve to attain a constant flow output — once set, the stem is locked so the setting cannot be disturbed.

  • LockingBy Allen screw
  • End Conn.TOD / FPT
  • Tube OD1/8" to 1" OD (Fractional)
    3 mm to 25 mm OD (Metric)
  • Thread (FPT)1/8" to 1" NPT (Taper); BSPP / BSPT / ISO / Metric on request
  • Test PressureUp to 6000 psi
  • PackingPTFE
  • MOCSS 316, 304 / Brass / Alloy 400, 600, C276 / CS
  • Model No.MOC*-NVL-IN*-OUT*
02
Specifications

Technical Specifications

ProductInstrumentation Needle Valve — Straight & Angle Pattern
Process & Instrument Connection1/4", 3/8", 1/2", 3/4", 1" — NPT (ASME B1.20.1), BSP / BSPT, tube OD (compression) & others on request
End ConfigurationsOD × OD, Male × Female, Female × Female, Angle type
Max Working Pressure3000 / 6000 / 10000 PSI (207 / 414 / 690 bar) depending on model and material
PackingPTFE (standard, up to 232 °C), Grafoil (high temperature, up to 538 °C), PEEK on request
BonnetScrewed bonnet with locking pin; back-seating stem
Stem TipHard-seat regulating tip; soft-seat tip on request for gas service
Body MaterialsSS 304, SS 316, SS 316L, Brass, Monel 400, Inconel 600 / 625, Hastelloy C-276 & others on request
OptionsOxygen service cleaning, NACE MR0175 / ISO 15156 materials, panel mounting, colour-coded handles
TestingHydrostatic shell & seat test, pneumatic seat test, PMI, TPI on request
CertificatesEN 10204 3.1 material certificate, test certificate, third party inspection on request

Valve Parts & Materials — Standard SS 316 Construction

No.PartMaterialFunction
1BodySS 316 (ASTM A479) / as orderedPressure-retaining body with integral seat
2BonnetSS 316 (ASTM A479)Guides the stem and houses the packing
3StemSS 316, rolled threadsFine-pitch thread drives the tip onto the seat
4PackingPTFE / Grafoil / PEEKSeals the stem against leakage to atmosphere
5Packing GlandSS 316Transfers load evenly onto the packing
6Gland NutSS 316Adjusts packing compression in service
7Bonnet Lock PinSS 304Prevents accidental bonnet removal
8HandleSS 304 T-barManual operation
9Handle ScrewSS 304Secures handle to stem
10Dust CapPlastic, colour-codedProtects stem threads; identifies valve duty
11Panel Nut (option)SS 304Fixes valve through an instrument panel
Wetted parts follow the body material when Monel, Inconel, Hastelloy or Brass valves are ordered.
03
Materials

Material Grades

Stainless Steel

SS 304 SS 316 SS 316L

Nickel Alloys

Monel 400 Inconel 600 Inconel 625 Hastelloy C-276

Copper Alloys & Others

Brass C36000 Other grades on request
MaterialUNS No.Bar StockForgings
SS 304S30400ASTM A479 / A276ASTM A182 F304
SS 316S31600ASTM A479 / A276ASTM A182 F316
SS 316LS31603ASTM A479 / A276ASTM A182 F316L
Monel 400N04400ASTM B164ASTM B564
Inconel 600N06600ASTM B166ASTM B564
Inconel 625N06625ASTM B446ASTM B564
Hastelloy C-276N10276ASTM B574ASTM B564
BrassC36000 / C37700ASTM B16ASTM B283
04
Material Charts

Chemical & Mechanical Properties

GradeCMnSiPSCrNiMoOthers
SS 3040.082.001.000.0450.03018.0–20.08.0–10.5—N 0.10
SS 3160.082.001.000.0450.03016.0–18.010.0–14.02.0–3.0N 0.10
SS 316L0.0302.001.000.0450.03016.0–18.010.0–14.02.0–3.0N 0.10
Monel 4000.302.000.50—0.024—63.0 min—Cu 28.0–34.0, Fe 2.5
Inconel 6000.151.000.50—0.01514.0–17.072.0 min—Fe 6.0–10.0, Cu 0.50
Inconel 6250.100.500.500.0150.01520.0–23.058.0 min8.0–10.0Nb+Ta 3.15–4.15, Fe 5.0
Hastelloy C-2760.0101.000.080.040.0314.5–16.5Balance15.0–17.0W 3.0–4.5, Fe 4.0–7.0
Brass C36000————————Cu 60.0–63.0, Pb 2.5–3.7, Fe 0.35, Zn Bal.
Values in weight %. Single values are maximum unless stated. Limits as per the applicable ASTM bar stock specification.
GradeTensile Strength (MPa, min)Yield Strength 0.2% (MPa, min)Elongation (%, min)Hardness (max)
SS 30451520540201 HB
SS 31651520540217 HB
SS 316L48517040217 HB
Monel 40048017035—
Inconel 60055024030—
Inconel 62582741430—
Hastelloy C-27669028340—
Brass C36000338–469*124–310*18–53*—
Annealed condition. *Brass values are typical ranges depending on temper and bar diameter.
GradeDensity (g/cm³)Melting Range (°C)Key Characteristic
SS 3048.001400–1450General corrosion resistance, economical
SS 316 / 316L8.001375–1400Molybdenum for chloride & pitting resistance
Monel 4008.801300–1350Sea water, hydrofluoric acid service
Inconel 6008.471354–1413High temperature oxidation resistance
Inconel 6258.441290–1350High strength, crevice corrosion resistance
Hastelloy C-2768.891325–1370Severe oxidising & reducing chemicals
Brass C360008.50885–900Free machining, water & air service
05
Dimensions

Dimension, Flow & Pressure Tables

Orifice Size & Flow Coefficient (Cv)

End SizeOrifice (mm)Orifice (in)Cv (approx.)Standard Rating (PSI)
1/4"4.00.1560.356000
3/8"4.80.1870.506000
1/2"4.8 / 6.40.187 / 0.2500.50 / 0.906000
3/4"6.40.2500.906000
1"8.00.3121.406000
1/4" – 1/2" (10000 PSI)3.20.1250.2010000

Female × Female Straight Pattern — Typical Dimensions

End Size (NPT)End to End L (mm)Height, Open H (mm)Body Width (mm)Handle Length (mm)
1/4"57952560
3/8"641002860
1/2"701083275
3/4"831253890
1"9514045100

Pressure–Temperature Rating by Packing — 6000 PSI SS 316 Valve

TemperaturePTFE Packing (PSI)Grafoil Packing (PSI)
-54 to 38 °C (-65 to 100 °F)60006000
93 °C (200 °F)51605160
149 °C (300 °F)46604660
204 °C (400 °F)42804280
232 °C (450 °F)35004130
316 °C (600 °F)—3760
427 °C (800 °F)—3460
538 °C (1000 °F)—3280
All values are typical and for reference only. PTFE packing is limited to 232 °C; use Grafoil above this temperature. Ratings for Brass and nickel alloy bodies differ. Final dimensions and ratings are confirmed on the approved drawing for your order.
06
Applications

Where Our Needle Valves Are Used

Pressure Gauge Isolation

Transmitter Root Valves

Sampling & Analyser Lines

Oil & Gas Wellheads

Power Plant Steam Service

Hydraulic Systems

Vent & Drain Points

Oxygen & Gas Panels

07
Why Kalpataru

Features & Advantages

Precise Regulation

Fine-pitch stem threads and a tapered tip give smooth, repeatable throttling from fully closed to fully open.

Safe Bonnet Design

Locking pin and back-seating stem keep the bonnet in place and relieve the packing when the valve is fully open.

Packing for Every Duty

PTFE for general service, Grafoil for high-temperature steam and hydrocarbons, PEEK where required.

Tested & Traceable

Every valve is shell and seat tested before dispatch, with heat numbers linked to mill certificates. PMI and TPI on request.

08
FAQ

Frequently Asked Questions

What is the difference between a needle valve and a ball valve?
A ball valve opens or closes with a quarter turn and is best for quick on/off isolation. A needle valve needs several turns and uses a tapered stem, which gives fine flow control and a tight shut-off at high pressure — preferred for gauge and transmitter isolation and sampling.
Which packing should I choose — PTFE or Grafoil?
PTFE is the standard choice for most liquids and gases up to about 232 °C. Grafoil (flexible graphite) is used for steam and high-temperature service up to about 538 °C. PEEK packing is available on request where higher mechanical strength than PTFE is needed.
Can the packing be adjusted without removing the valve?
Yes. If minor stem leakage appears, tighten the gland nut about 1/8 of a turn at a time until it stops. With the stem fully back-seated, the packing is isolated from line pressure for safer adjustment.
Do you supply needle valves for oxygen or sour service?
Yes. Valves can be cleaned and packed for oxygen service, and supplied in materials meeting NACE MR0175 / ISO 15156 for sour gas applications. Please state the requirement at the enquiry stage.
09
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