Oil & Gas
CRS PLUS sources cast and forged valves to API and ASME standards for pipeline, process and utility service — from NPS ½ to 48 and class 150 to 2500 — in carbon steel, stainless, duplex and alloy materials, with control valves, pressure relief valves and actuators on request. Every quotation states the design standard, material and test certification that governs the supply.
Sourced through the qualified supplier base. Listing does not indicate stock held by CRS PLUS — availability, origin and lead time are confirmed per enquiry, and every quotation states the certification that governs the supply.
The default isolation valve for pipeline and process service.
Quarter-turn isolation with tight shut-off; trunnion designs for larger sizes and higher pressures.
Where flow regulation rather than simple isolation is required.
Non-return protection selected on cracking pressure, reverse-flow velocity and installation orientation.
Compact quarter-turn valves for large-bore water, utility and process lines.
Sized and specified against the process datasheet.
Every valve enquiry is defined by the parameters below. Supplying them on the RFQ allows an exact quotation on the first pass.
| Parameter | What it defines | Common values |
|---|---|---|
| Size | Nominal pipe size | NPS ½ to 48 / DN 15 to 1200 |
| Pressure class | Pressure–temperature rating of the body | ASME class 150, 300, 600, 900, 1500, 2500 / PN 16 to 400 |
| Design standard | The construction and testing standard | API 600, 602, 608, 6D, 594, 609, 599, 526; BS 1873, 1868 |
| Face-to-face | Installation length | ASME B16.10 |
| End connection | How the valve joins the pipe | Flanged RF or RTJ to ASME B16.5 / B16.47; butt weld B16.25; socket weld or threaded B16.11 |
| Body material | Pressure-containing casting or forging | ASTM A216 WCB, A352 LCB, A351 CF8/CF8M, A105, A182 F316/F51, A995 4A/5A duplex |
| Trim | Seat, disc and stem materials | API 600 trim numbers 1 to 18; stellite-faced, 13Cr, 316, Monel |
| Testing | Shell, seat and closure tests | API 598; API 6D for pipeline valves |
| Special requirements | Service-specific additions | NACE MR0175 / ISO 15156 sour service; API 607 fire-safe; ISO 15848 fugitive emissions; cryogenic to BS 6364 |
The three most-requested valve types serve different purposes. Selecting the wrong type is the most common error on a first enquiry.
| Property | Gate valve | Globe valve | Ball valve |
|---|---|---|---|
| Primary duty | Isolation, fully open or closed | Throttling and regulation | Isolation, quarter-turn |
| Pressure drop when open | Very low | High | Very low (full bore) |
| Throttling | Not recommended — seat erosion | Designed for it | Not recommended except V-port |
| Operation | Multi-turn | Multi-turn | Quarter-turn |
| Tight shut-off | Good | Good | Excellent |
| Typical standard | API 600 / API 602 | BS 1873 / API 602 | API 6D / API 608 |
No manufacturer-specific figures are published here: CRS PLUS sources from several mills and manufacturers and each issues its own certificate, which governs. These are the documents and tests a quotation and delivery will normally include.
| Document or test | Standard or method |
|---|---|
| Material test certificate for body and bonnet | EN 10204 3.1, with heat number traceability |
| Hydrostatic shell test | API 598 / API 6D |
| Seat leakage test | API 598 / API 6D |
| Low-pressure air seat test | API 598 |
| Non-destructive examination of castings | ASME B16.34 Annex; RT, MT or PT as specified |
| Hardness testing | ASTM E10 / E18; NACE limits where specified |
| Positive material identification | On request for alloy and stainless |
| Fire-safe type test certificate | API 607 / API 6FA where specified |
| Fugitive emissions certificate | ISO 15848-1 where specified |
| Third-party inspection release | EN 10204 3.2 on request |
API 600 covers cast steel gate valves in bolted-bonnet construction, typically NPS 2 and larger, in classes 150 to 2500. API 602 covers compact forged steel gate, globe and check valves in the small sizes, typically NPS ½ to 2, in classes 800 and 1500 and also in flanged classes 150 to 2500. The two standards cover the same duty at different size ranges; the choice follows pipe size.
The ASME class is a pressure–temperature rating: a class 150 carbon steel valve is rated for roughly 19.6 bar at ambient temperature, falling as temperature rises, per the tables in ASME B16.34. PN is the equivalent European nominal pressure designation in bar. Class 150 is broadly comparable to PN 20, class 300 to PN 50, class 600 to PN 100 — but flange dimensions differ between the two systems, so they are not interchangeable without adaptors.
API 6D is the pipeline valve standard, written for transmission and gathering lines, and requires more extensive testing, documentation and design features such as double block-and-bleed and fire-safe design. API 608 covers metal ball valves for general process piping. Pipeline operators specify API 6D; plant and process piping normally accepts API 608 or equivalent.
NACE MR0175 / ISO 15156 defines material requirements for equipment in sour service — hydrogen sulphide-containing environments — to prevent sulphide stress cracking. It restricts hardness, specifies heat treatment and limits certain alloys. Any valve for a well stream, gas processing or sour crude system will normally be specified NACE-compliant, and this should be stated on the enquiry.
A 3.1 certificate is issued by the manufacturer, confirming the material and tests against the order, signed by the manufacturer’s own inspection department independent of production. A 3.2 certificate is additionally validated by an independent third-party inspector or the purchaser’s representative who witnesses the tests. 3.1 is standard for most supply; 3.2 is specified for critical service or where the project requires third-party witness.
Size, pressure class, valve type and design standard, end connection and facing, body and trim materials, operating fluid, pressure and temperature, actuation if required, quantity, and any special requirements — NACE, fire-safe, cryogenic, fugitive emissions or third-party inspection. A line from the project valve datasheet or a tag number with its specification covers all of this.
CRS PLUS sources valves from its qualified supplier base of API-licensed and ISO-certified foundries and valve manufacturers in China, India, Europe and the Gulf. Origin and the certifying body are stated on each quotation. CRS PLUS does not name manufacturers on this page and holds no distribution or agency agreement with any of them.
A structured offer follows within 72 hours.