API 600 Cast Steel Gate Valve: Bolted Bonnet, Class 150–900

Cast Steel Gate & Globe Valves

The API 600 cast steel gate valve, with bolted bonnet, outside screw and yoke (OS&Y) rising stem and flexible or solid wedge, is the basic isolation valve of refineries and petrochemical plants. The standard defines minimum wall thicknesses, stem diameters and trim materials for heavy-duty service.

API 600 / ISO 10434ASME B16.34API 598Class 150–900

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Overview

On API 600 valves in Class 150–900, the bonnet is bolted to the body through a flanged joint; higher classes typically use a pressure seal design, which falls outside API 600 and is built to ASME B16.34. Renewable seat rings, a backseat and the stuffing box components make maintenance easier.

The wedge, seat and stem material combination is specified by the API trim number; the usual refinery choice is Trim 8 (13Cr wedge, Stellite hard-faced seats). Where low emissions are required, a packing arrangement type-tested to API 624 can be specified.

Technical specifications

Key features

• OS&Y rising stem: position visible from outside
• Flexible wedge: resists thermal binding
• Renewable seat rings and backseat
• Clear material definition by API trim number

Face-to-face dimensions (mm)

Flange-to-flange dimensions of cast steel gate valves follow ASME B16.10, so valves of the same size and class are interchangeable between manufacturers.

Values are for raised-face (RF) flanged ends and conform to ASME B16.10. Ring-type joint (RTJ) ends are slightly longer; butt-weld (BW) end-to-end dimensions are listed separately in the standard. Exact dimensions are shown on the general arrangement (GA) drawing supplied with the quotation.

Typical part materials

In all material groups, the standard gasket is spiral-wound SS304/SS316 with graphite filler and the standard packing is flexible graphite (PTFE on request). The stem nut is austenitic ductile iron (A439 D2) or copper alloy, and the handwheel is malleable iron. For sour (H₂S) service, materials and hardness are selected to NACE MR0175 / ISO 15156.

Trim options (API 600)

Trim is the material combination of the internal parts in contact with the fluid: wedge (or disc), seat and stem. Stating the trim number in the inquiry and the order defines the internal materials in a single line:

The table lists the most common trims. For the full API 600 trim table (1–18) or special trims, send us your specification.

Documentation and testing

On industrial projects the documentation package matters as much as the valve. We confirm the certificate and test scope for every line item at quotation stage:

• EN 10204 3.1 material certificates for pressure-retaining and wetted parts, traceable by heat number
• EN 10204 3.2 with third-party inspection, on request
• Pressure test reports to API 598 or EN 12266-1: shell, seat and, where specified, gas tests
• Fire-test certificates (API 607 / ISO 10497) for fire-safe type-tested designs
• PMI reports for alloy and stainless materials
• Dimensional, visual and coating inspection records
• PED 2014/68/EU CE declaration for equipment within its scope
• NACE MR0175 / ISO 15156 compliance statement for sour (H₂S) service

Technical datasheet

• PDFAPI 600 Cast Steel Gate Valve: technical datasheetPDF · English · 2–3 pages

Produits associés

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API 6D Slab Gate Valve

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BS 1873 Cast Steel Globe Valve

Bolted and pressure seal bonnet; flat or plug disc, backseat, Stellite trim.

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