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Gauge Isolation Series

Gauge Valves

Single port and multi port gauge valves that isolate, vent and test pressure gauges without shutting down the process — 1/4" to 1" NPT / BSP, rated up to 10000 PSI.

Stainless steel gauge valves for pressure gauge isolation
Up to 10000 PSIWorking pressure*
Product Overview

Single & Multi Port Gauge Valves

A gauge valve sits between the process tapping and the pressure gauge. Its needle-type stem isolates the gauge from line pressure, and a built-in vent / bleed screw releases the trapped pressure so the gauge can be removed, replaced or zero-checked safely while the plant keeps running.

Kalpataru gauge valves are machined from solid bar stock with a back-seated, non-rotating stem tip and an adjustable packing below the threads, so the stem threads never touch the process fluid. Multi port versions add extra outlets for a test gauge, calibrator or second instrument.

  • Isolate & vent in one body
  • Bubble-tight metal stem seat
  • Stem threads isolated from media
  • Blow-out proof stem design
  • PTFE, Grafoil or PEEK packing
  • 100% pressure tested
Request a Quote View Dimensions
Connections1/4" to 1"
EndsNPT, BSP & others on request
Max Working Pressure3000 / 6000 / 10000 PSI
MaterialsSS 304 / 316 / 316L, Brass, Alloys
01
Types

Gauge Valve Types

SP
Single port gauge valve illustration

Single Port Gauge Valve

One process inlet, one gauge outlet and a plugged vent / bleed port. The standard choice for isolating a single pressure gauge or switch on a process line, pump discharge or vessel nozzle. Straight-through body keeps the installation short and easy to support.

1 gauge outletVent / bleedMale × Female
MP
Multi port gauge valve illustration

Multi Port Gauge Valve

Adds two or more outlet ports downstream of the isolating stem. Use them to connect a working gauge and a test gauge side by side, hook up a calibrator without breaking the gauge joint, fit a pressure switch, or run a separate vent line to a safe location.

2–4 outletsTest / calibrationVent port
02
Specifications

Technical Specifications

ProductGauge Valves — Single Port & Multi Port
Process Connection1/4", 3/8", 1/2", 3/4", 1" — NPT / BSP male or female, others on request
Instrument (Gauge) Connection1/4" to 1" NPT / BSP female, 1/2" NPT F most common
Vent / Test Port1/4" NPT / BSP female with plug or bleed screw
End ThreadsNPT (ASME B1.20.1), BSP / BSPP (ISO 228), BSPT (ISO 7) & others on request
Max Working Pressure3000 PSI / 6000 PSI / 10000 PSI (207 / 414 / 690 bar) depending on model and material
StemRising stem with non-rotating tip, metal-to-metal seat, back seating
PackingPTFE (standard), Grafoil for high temperature, PEEK for high pressure
Body MaterialsSS 304, SS 316, SS 316L, Brass, Inconel, Monel, Hastelloy C & others on request
OptionsOxygen service cleaning, NACE MR0175 / ISO 15156 compliant materials, PMI, TPI, Grafoil & PEEK packing
TestingHydrostatic shell & seat test; nitrogen / air seat test on request
CertificatesEN 10204 3.1 material certificate, test certificate, third party inspection on request
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

Brass C36000
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
BrassC36000ASTM B16—
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

Parts, Connection & Pressure Tables

Parts & Materials of Construction (SS 316 Valve)

No.PartStandard MaterialNotes
1BodySS 316 (ASTM A479)Machined from solid bar stock
2BonnetSS 316Threaded into body, locked
3Stem / SpindleSS 316Non-rotating tip, back seated
4Gland PackingPTFEGrafoil or PEEK optional
5Gland NutSS 316Adjustable to take up packing wear
6HandleSS 304T-bar type
7Lock NutSS 304Secures bonnet / handle
8Vent / Bleed ScrewSS 316Releases trapped pressure before gauge removal
9PlugSS 316Blanks unused ports on multi port valves

Common Connection Combinations

TypeProcess InletGauge OutletAdditional Ports
Single Port1/4" NPT Male1/4" NPT Female1/4" NPT F vent, plugged
Single Port1/2" NPT Male1/2" NPT Female1/4" NPT F vent, plugged
Single Port1/2" NPT Female1/2" NPT Female1/4" NPT F vent, plugged
Single Port3/4" or 1" NPT Male1/2" NPT Female1/4" NPT F vent, plugged
Multi Port1/2" NPT Male2 × 1/2" NPT Female1/4" NPT F vent, plugged
Multi Port1/2" NPT Male1/2" NPT Female1/4" NPT F test port + 1/4" NPT F vent
Multi Port1/2" NPT Female3 × 1/2" NPT Female1/4" NPT F vent, plugged
BSP Version1/4" to 1" BSP / BSPT Male or Female1/4" or 1/2" BSP Female1/4" BSP F vent

Pressure–Temperature Rating by Packing (SS 316 Body)

PackingTemperature Range (°C)Max Pressure at 38 °C (PSI)Max Pressure at Upper Limit (PSI)Typical Service
PTFE-54 to 23260003500 at 232 °CGeneral process, water, oil, air, chemicals
PEEK-54 to 315100004000 at 315 °CHigh pressure hydraulics, wellhead, injection
Grafoil-54 to 45460004200 at 454 °CSteam, hot oil, boiler and high temperature lines
Typical industry values for reference only. Actual rating depends on model, body material and end connection; NPT threads and tubing may limit pressure further. Final dimensions and ratings are confirmed on the approved drawing for your order.
06
Applications

Where Our Gauge Valves Are Used

Pressure Gauge Isolation

Gauge Calibration Points

Pressure Switch Hook-ups

Boiler & Steam Lines

Hydraulic Systems

Oil & Gas Wellheads

Pump & Compressor Discharge

Chemical Process Plants

07
Why Kalpataru

Features & Advantages

Safe Gauge Removal

The vent / bleed screw depressurises the gauge side before the gauge is unscrewed, protecting the technician and the instrument.

Blow-out Proof Stem

The stem is retained by the bonnet and back seats when fully open, so it cannot be backed out of the body under pressure.

Non-Rotating Tip

The stem tip closes onto the seat without spinning, reducing seat galling and giving repeatable shut-off over many cycles.

Full Traceability

Heat numbers are marked on bodies and recorded against mill certificates, with PMI and TPI available on request.

08
FAQ

Frequently Asked Questions

What is the difference between a gauge valve and a needle valve?
Both use a needle-type stem for isolation. A gauge valve is a needle valve built specifically for gauge service: it has a gauge outlet, a vent / bleed port to release trapped pressure, and on multi port versions extra outlets for test equipment. A plain needle valve has only an inlet and an outlet.
When should I choose a multi port gauge valve?
Choose a multi port valve when you need to connect a test gauge or calibrator without disturbing the working gauge, when a pressure switch and gauge share one tapping, or when the vent must be piped away to a safe drain. It saves separate tees and fittings in the hook-up.
Which packing should I select?
PTFE is the standard packing for most liquids, gases and chemicals up to about 232 °C. Grafoil is used for steam and other high temperature service. PEEK is chosen for high pressure service, typically in 10000 PSI valves, where PTFE would cold-flow.
Can gauge valves be supplied for sour gas or oxygen service?
Yes. We supply valves with materials selected to NACE MR0175 / ISO 15156 for sour service, and valves specially cleaned and packed for oxygen service. Please state the requirement on your enquiry so the right materials and cleaning are applied.
09
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