Titanium Gr2 Instrumentation Valves (UNS R50400 / CP Titanium Grade 2)

Titanium Gr2 instrumentation valves are small-bore isolation, throttling, and block-and-bleed valves machined from UNS R50400, commercially pure (CP) unalloyed titanium (W.Nr. 3.7035, roughly 99% titanium with controlled interstitials). Crestflo builds the whole valve family in this grade: needle, ball, check, 2/3/5-valve manifolds, monoflange, double block-and-bleed, and bleed valves, sized 1/16-inch through 1-inch. You reach for a titanium body and trim when the line carries seawater, brine, wet chlorine, hypochlorite, or chlorine-dioxide liquor, the chloride-driven duty where even high-alloy stainless pits, cracks, or seizes, and where the valve's light weight is a bonus on a topside or marine rack. Titanium is a different metal system, not a stainless: it resists these media through a self-healing titanium-dioxide passive film, which makes it effectively immune to chloride pitting, crevice attack at moderate temperatures, and chloride stress-corrosion cracking. Design follows ASME B16.34, and seat and shell leak testing follows the applicable API 598 / BS EN 12266 practice. Because titanium galls readily, anti-galling measures on the stem and seat (silver plating or a dissimilar hardened mating surface) are a genuine engineering requirement on a titanium valve, not an afterthought. Standard items ship from stock; specials are built to order, with delivery running 6-8 weeks. Request a quote to price your configuration.

Reviewed by the Crestflo Engineering Team

Swagelok®, Parker®, and Hy-Lok® are trademarks of their respective owners; Crestflo is not affiliated, and interchange is dimensional.

Why Specify a Titanium Gr2 Valve Body and Trim

A valve is a harder corrosion problem than a straight run of tube. The media sits trapped in body cavities, dead legs, and the packing bore. It cycles across the seat. It concentrates in crevices under the stem and in thread roots. That is exactly the geometry where chloride pitting, crevice attack, and chloride stress-corrosion cracking start, so a valve in the wrong alloy fails long before the pipe around it does: on a seawater line, a 316 valve pits out in the stem crevices and seat pocket while the tube still looks fine.

Titanium Gr2 solves that problem through a mechanism that is fundamentally different from stainless. Stainless and nickel alloys resist chlorides through a chromium-molybdenum-nitrogen balance; titanium resists them through a tenacious, self-healing titanium-dioxide (TiO₂) passive film that reforms the instant it is scratched. That film is why Grade 2 is effectively immune to chloride pitting, crevice corrosion at moderate temperatures, and chloride stress-corrosion cracking, not merely resistant, but outside the failure modes that govern a stainless valve in seawater. Because titanium does not rely on a stainless alloying balance, a PREN (Pitting Resistance Equivalent Number) does not apply to it; PREN is a stainless/duplex index and is not quoted for titanium. For a valve that sees seawater, chlorinated cooling water, bleach liquor, or chlorine-dioxide, that is the difference between a valve that keeps sealing and one that seizes.

Two other traits earn titanium its place on a valve. First, weight: at a density of about 4.5 g/cm³, titanium is roughly 40% the weight of steel, which matters on aerospace, topside, and weight-sensitive marine installations where a rack of valves adds up. Second, and specific to a valve, galling. Titanium galls readily under high local contact pressure, and a valve has two surfaces where that bites: the stem turning in the bonnet and packing, and the stem tip or ball seating against its seat. Bare titanium-on-titanium at those interfaces can seize and tear, so a titanium valve needs anti-galling measures designed in. More on that below, it is the single most important build detail on a Grade 2 valve.

Be honest about where titanium belongs. It is excellent in seawater, brine, wet chlorine, hypochlorite, chlorine dioxide, and oxidizing acids such as nitric, and it is good in caustic. It is poor in dry chlorine (which can ignite titanium), in hydrofluoric acid (which attacks it aggressively, avoid entirely), and in hot concentrated reducing acids like hydrochloric and sulfuric unless they are dilute, inhibited, or carry an oxidizer. Where the governing threat is a hot reducing acid rather than chlorides, the right valve body is a nickel alloy such as Hastelloy C-276 or Monel, not titanium; where you need chloride resistance together with much higher strength-per-wall in a thin, high-pressure body, super-duplex 2507 is the better call; and where the chloride load is heavy but titanium's reducing-acid limits or cost are a problem, a 6-moly super-austenitic like 254 SMO is the alternative. Match the alloy to the media. The full metallurgical picture, composition ranges, mechanical and physical properties, and corrosion-by-media data, lives on the Titanium Grade 2 alloy grade page. This page stays on the valve.

Also Specified As: Titanium Grade 2 Needle Valve, CP Titanium Ball Valve, UNS R50400 Valve

Buyers and specifiers call these valves several ways, and they all point to the same commercially pure titanium. A requisition might read "Titanium Grade 2 needle valve," "CP titanium ball valve," "UNS R50400 valve," "Ti Gr2 manifold valve," "Grade 2 titanium instrument valve," or just "titanium instrumentation valve," and each one lands here. The formal designations are UNS R50400 (the US number) and Werkstoff 3.7035 (the European one); DIN calls it Ti2 / Ti 40, JIS calls it Class 2, and the common trade name is "50A" (Ti-50A). One caution worth keeping on the PO: Grade 2 is not Grade 5. Grade 5 (Ti-6Al-4V, UNS R56400) is an alloyed, high-strength titanium for structural and aerospace loads, a different metal with lower weldability and corrosion resistance than CP Grade 2.

Scope: these are instrumentation valves, the small-bore kind that isolate and throttle gauge, transmitter, analyzer, impulse, and sample lines. A ball valve here means an instrument ball valve, not a plumbing valve; a needle valve means a flow-metering instrument valve, not a carburetor part; a manifold means a valve manifold, not an exhaust or PEX manifold. "Gr2" is the CP titanium grade designation, not a plumbing or electrical part.

Titanium Gr2 Valve Types: Needle, Ball, Check, Manifold, Monoflange & DBB

Crestflo machines the full instrumentation valve family in Titanium Gr2, so you can standardise an entire hookup, primary isolation through bleed, on a single seawater-grade alloy. Each type links to its own detail page for dimensions and ordering.

Beyond these, Titanium Gr2 is available in gauge/root, metering, toggle, plug, relief, and packless (bellows and diaphragm) patterns, and the grade also covers regulator bodies for chloride service. Spell out the function on the RFQ and the engineering team confirms the build. For the complete family and the specialty patterns, start at the instrumentation valves pillar.

Titanium Gr2 Manifold Valves: 2-, 3- & 5-Valve for DP Transmitters

The manifold is where Titanium Gr2 earns its keep on a seawater, brine, or chlorination DP measurement. A 3-valve manifold gives you two block valves plus an equalise valve to protect the transmitter cell during zeroing; a 5-valve adds two bleed/vent valves for calibration and purging. Crestflo builds these in titanium with non-rotating stem tips to protect the seat, and every manifold gets 100% seat and shell leak testing before it ships. Direct-mount and remote-mount patterns both carry over to the alloy. On a chloride-laden DP tap, the trapped media sitting in the block cavities is exactly what pits a 316 manifold out from the inside; the titanium body keeps that from becoming the failure point, and because titanium is non-magnetic, the manifold is also a natural fit where magnetic permeability on the instrument rack is a concern.

Actuation: Manual and Pneumatic Titanium Gr2 Valves

Most instrumentation titanium valves are hand-operated, bar-stock or forged-body construction, with the handle chosen for the duty: lever and phenolic or metal T-bar handles on ball valves, vernier and locking/lockout handles where throttling repeatability or line-identification matters, and color-coded handles for service marking. Because Titanium Gr2 is non-magnetic, it is a natural fit where stray magnetic fields or permeability are a concern on the instrument rack. Where a line needs remote or automated operation, ball and needle patterns are available with pneumatic actuation. Panel-mount and low-profile builds support instrument-rack and enclosure installations, and the alloy's light weight helps where a bank of valves hangs off a topside or shipboard panel.

Galling & Anti-Galling Measures on a Titanium Valve: Silver Plating & Dissimilar Trim

Titanium galls, and a valve is where that matters most. A compression fitting makes up once or twice; a valve stem turns against the bonnet and packing every time it is operated, and a needle or ball seats against its seat on every cycle. Bare titanium-on-titanium at those interfaces, under the high local contact pressure a stem thread or a metal seat develops, can cold-weld, seize, and tear, which first stiffens the valve and then destroys the seal. This is not a theoretical concern on titanium; it is the design detail that separates a titanium valve that cycles cleanly from one that galls its stem into the bonnet.

Crestflo addresses it two ways, chosen for the pattern and the duty. The first is silver anti-galling plating on the stem and threaded surfaces: a thin, sacrificial, low-shear silver layer that lets the stem make up and back off cleanly without titanium contacting titanium. The second is a dissimilar or hardened mating surface at the seat and tip, pairing the titanium body against a harder, different seat or stem-tip material so the two surfaces that cycle against each other are never the same galling-prone titanium. Soft-seated patterns sidestep the seat-galling problem entirely by seating the titanium against a PTFE, PEEK, or PCTFE seat rather than metal. Note the galling requirement on the RFQ with the valve type and cycle duty, and the engineering team confirms the right anti-galling build.

Seat & Packing Materials for Seawater, Chloride & Wet-Chlorine Service

The titanium body and trim handle the corrosion; the soft-goods set the temperature ceiling and the seat-leakage class. This is the choice that most often gets a titanium valve wrong, picking a packing that can take the chemistry but not the heat, or the reverse. The seat and stem-seal options below pair with a Titanium Gr2 body, and the temperature limits are the standard published limits for each material, capped by the titanium body's own ceiling of roughly 600°F (315°C) for continuous service. Confirm the certified rating for your build on the RFQ.

For seawater and chloride duty the usual pairing is a titanium body and trim with reinforced PTFE, where a bubble-tight soft seat matters, the temperature sits in the moderate band most chloride service lives in, and the soft seat conveniently removes the seat-galling question. The point of titanium is that the metal in contact with the media does not become the weak link; the soft-good choice then tunes the valve to the temperature and the leak class. Note the body ceiling here: Titanium Gr2 is an unalloyed alpha grade that holds useful mechanical strength to roughly 600°F (315°C) for continuous service, a lower ceiling than the nickel alloys, so that figure caps the hottest builds and even the graphite packing cannot be run past it. A metal-to-metal seat on titanium must be built against a dissimilar or hardened mating surface to avoid galling. A line hotter than titanium's band, or one driven by a reducing acid, is a signal to look at a nickel-alloy valve instead. Seat and packing figures follow the applicable standard and are customisable to requirement.

Titanium Gr2 Valve Sizes (1/16″–1″) & End Connections: NPT, BSPP, Tube & Weld

Titanium Gr2 instrumentation valves ship in imperial fractional sizes from 1/16-inch to 1-inch and in a matching metric menu, with the port and end connection configured to the hookup. Tube-fitting (compression) ends land as single or double ferrule and interchange dimensionally with the major brands; threaded ends follow published thread dimensions and can be tailored. Because titanium galls on threaded and stem surfaces, Crestflo applies anti-galling measures such as silver plating on threaded ends and stems on request where repeated make-up or high torque is expected.

Port configuration, bore, and Cv depend on the valve type and size; the engineering team confirms the orifice and flow coefficient for your pattern at quotation. Values per applicable standard; customisable to requirement.

Pressure & Temperature Ratings for Titanium Gr2 Instrumentation Valves

Pressure rating is set by the valve design and its governing standard, not by the alloy. Manifolds are rated up to 10,000 psi and double block-and-bleed valves to 3,000 psi under ASME B16.34; other types carry their own ratings on their detail pages, and higher-pressure requirements are handled on the high-pressure line. One honest note on titanium: Grade 2 yields at 275 MPa (40 ksi), modest next to a super-duplex or nickel alloy, so where a thin-wall, high-pressure body needs strength-per-wall in chloride service, super-duplex 2507 is the better choice than up-rating titanium. The temperature ceiling is the lower of two limits: what the titanium body can take and what the seat and packing material allows. Titanium Gr2 holds useful strength from cryogenic temperatures up to roughly 600°F (315°C) for continuous service, with strength derating as temperature rises; above that band it is not the right material. In most seawater and chloride service the real line temperature sits well under that figure and the soft-good packing sets the practical limit. Confirm the exact certified rating for your build on the RFQ.

Corrosion & Service: Seawater, Wet Chlorine, Oxidizing Acids: and the Honest Limits

What a valve actually sees in service is the whole reason to specify Titanium Gr2 over stainless. This alloy was built for seawater and chloride duty, and that is exactly where it earns its place, but titanium is not universal, and the table below is honest about both sides. These are the grade's published, standard-referenced characteristics, not a per-valve rating; the corrosion allowance and suitability for a specific stream stay the specifier's call.

Where the governing threat is a hot reducing acid rather than chlorides, use a nickel-alloy valve such as Hastelloy C-276; where you need chloride resistance together with much higher strength-per-wall, super-duplex 2507 is the better fit; and where the chloride load is heavy but titanium's reducing-acid or cost limits are a problem, a 6-moly super-austenitic like 254 SMO is the alternative. For the side-by-side with stainless, see titanium vs stainless steel.

Standards, Testing & NACE / ISO 15156 Compliance

A valve's pressure boundary and its seat are qualified against different standards than a fitting is, and titanium valves follow the valve standards, not the compression-fitting standard. Pressure-boundary design follows ASME B16.34. Seat-leakage and pressure testing follow the applicable API 598 / BS EN 12266 regime for the valve type. For sour and chloride service, titanium alloys are addressed as corrosion-resistant alloys within NACE MR0175 / ISO 15156, and Grade 2 is used in such service where the application qualifies; confirm the specific environmental limits, H₂S partial pressure, chloride level, and temperature, against your application before committing. Crestflo holds the standard approvals that apply to instrumentation valves.

Every valve runs through a deep test battery: hydraulic proof, burst, and impulse; pneumatic; flexure-fatigue, rotary-flex, vibration, and thermal-cycling work; plus pull-out and vacuum checks. Hydrostatic shell and seat-leak testing verify the pressure boundary and the shut-off, and helium leak testing is available where a gas-tight, low-fugitive seal must be proven. Positive material identification (PMI) confirms the alloy on every part, which matters on titanium, where a mis-supplied stainless substitute looks similar once machined but has none of the chloride immunity, and pits and cracks in the exact service titanium was chosen to survive. Non-destructive testing is done in-house. Manifolds all get 100% seat and shell leak testing. Destructive testing goes out to ISO/IEC 17025-accredited labs, and third-party inspection is available on request.

Material Traceability & Certification

Every Titanium Gr2 valve carries its own heat/lot number, and each order ships with an EN 10204 MTC 3.1 certificate as standard, with 3.2 available on request. PMI confirms the grade at the part level, every time. That documentation backs the audit trails that offshore, desalination, and chlor-alkali jobs demand. On titanium the specific risk is substitution: a valve quietly supplied as stainless looks identical once finished but pits and cracks in chloride service. Because titanium work-hardens, galls, and machines tougher than standard stainless, Crestflo keeps the work in-house on CNC, VMC, and EDM equipment to hold the tolerances a leak-tight instrumentation valve needs.

Applications for Titanium Gr2 Instrumentation Valves

Titanium Gr2 valves earn their place wherever chlorides and oxidizing media govern, the seawater-grade duty where pitting, crevice attack, and chloride stress-corrosion cracking are the failure modes that defeat stainless, and where titanium's light weight is a bonus:

• Desalination and seawater cooling, SWRO, MSF, and MED plants and seawater cooling-water instrumentation, where raw chloride service defeats standard stainless and titanium is the long-service standard. See the desalination and water industry page.
• Offshore and marine instrumentation, platform and subsea instrument hook-ups, hydraulic control lines, and shipboard systems exposed to seawater and salt spray, where corrosion margin and light weight both count. See the offshore and marine industry page.
• Chlor-alkali and wet chlorine, chlorine, hypochlorite, and chlorine-dioxide dosing and process lines, a defining titanium application, provided the chlorine stays wet.
• Coastal and chemical processing, oxidizing-acid and analytical service, and coastal plant instrumentation where the ambient environment alone is corrosive. See the petrochemical and chemical industry page.
• Aerospace and defense topside, weight-sensitive fluid systems where titanium's strength-to-weight and corrosion resistance both matter.

Pairing Titanium Gr2 Valves With Titanium Gr2 Fittings and Tubing

A valve is one part of the hookup. For a corrosion-matched instrument run, pair these valves with Titanium Gr2 tube fittings and Titanium Gr2 tubing so the whole assembly, body, ferrules, and tube, carries the same chloride immunity and the same traceability. Mixing a titanium valve onto 316 tube and fittings just moves the failure point downstream, to the first crevice the seawater finds.

Drop-In Interchange With Swagelok, Parker & Hy-Lok

Crestflo Titanium Gr2 instrumentation valves are built as dimensional interchange / equivalent valves for the major brands, with performance qualified against ASME B16.34 and the applicable API valve standards, not against marketing language. These are not "compatible" or "intermix" parts. Swagelok®, Parker®, and Hy-Lok® remain trademarks of their respective owners, and Crestflo is not affiliated; the interchange is strictly dimensional. We don't publish a part-number table. Instead, our engineering team prepares an interchange reference per project: request your cross-reference and we'll map your existing valve part numbers to Crestflo Titanium Gr2 equivalents.

Origin & US-Serving Positioning

Crestflo manufactures for the US market. Standard product comes from India; US or European melt is available on request, with full material traceability. Valves are engineered as US drop-in replacements and ship in 6-8 weeks, well under the 20+ weeks typical of the majors. If a project calls for a specific melt origin or TAA/DFARS handling, specify it on the RFQ, and we'll address it straight. We never claim "made in USA."

Why Crestflo for Titanium Gr2 Valves

Crestflo operates as the instrumentation division of an export house with four decades behind it and formal recognition from the Government of India, with a proven Middle-East delivery record. That backing grounds a focused instrumentation brand built on a handful of clear advantages:

• Lead time of 6-8 weeks versus 20+ weeks typical of the majors.
• The full valve family in one alloy, needle, ball, check, manifold, monoflange, and DBB, all in Titanium Gr2.
• Galling solved, not ignored, silver anti-galling plating on stems and threads, or a dissimilar hardened seat/tip mating, designed in for a titanium valve.
• Both imperial and metric sizing, with the seat and packing tuned to your temperature and leak class.
• Heat-number marking plus MTC 3.1/3.2 on every order, PMI-confirmed against substitution, with 100% seat and shell leak testing on manifolds.
• ISO 9001 / 14001 / 45001 & PED certified, cost-competitive after US duties and tariffs.

We Engineer Confidence.

Request a Quote for Titanium Gr2 Valves

Give us the details: valve type, size, port and end connections, seat and packing, anti-galling requirement, and the line conditions (media, pressure, temperature, sour-service requirement). We'll confirm the rating, build it to order, and schedule it.

• Request a quote, the fastest path to pricing and lead time.
• Request your Swagelok®/Parker® valve cross-reference and we'll map your part numbers.

Datasheets and CAD models are available to customers on request. Reach Crestflo's US sales desk at sales@crestflousa.com or +1 346 594 9005 (Houston, TX). Round out the system with Titanium Gr2 tube fittings and Titanium Gr2 tubing, and see where these valves serve in desalination and water and offshore and marine.

Frequently Asked Questions

Related Pages

• Titanium Grade 2 alloy grade & corrosion data
• Titanium Gr2 tube fittings · Titanium Gr2 tubing
• Instrumentation valves pillar · Needle valve · Ball valve · 3-valve manifold
• Titanium vs stainless steel · 254 SMO · Super Duplex 2507 valves · Hastelloy C-276 valves
• ASME B16.34 · NACE MR0175 · Desalination & water industry · Offshore & marine industry