Large-Diameter API 600 Gate Valve RFQ Checklist

Check flange series, valve materials, operator clearance and testing documents before ordering a large-diameter API 600 steel gate valve.

11/9/20261 min read

For a large steel gate valve, a mismatch at the piping flange or an operator that cannot clear the platform can delay installation even when the nominal size and pressure class are correct. Give bidders the connection, materials and inspection requirements together so their offers can be compared.

CONFIRM WHICH FLANGE WILL MATE WITH THE PIPE

List the NPS size, pressure class, flange facing and dimensional standard. Where ASME B16.47 applies, explicitly state Series A or Series B and verify the dimensions against the mating flange. If the project already has companion flanges or spools on site, share the flange drawing or measured details. Specify the required face-to-face standard or give the replacement envelope.

DEFINE MATERIALS AND OPERATION

List body, bonnet, wedge, seat or seat-facing materials, stem and bolting. Include project-specific service or traceability requirements in the enquiry. For gear operation, request operating torque, direction and handwheel clearance as applicable. For a motor-operated valve, also state the power supply, control and enclosure requirements. Ask for the estimated weight and lifting arrangement for the installation plan.

AGREE ON THE INSPECTION PACKAGE

Where the purchase order calls for API 598 inspection and testing, specify the applicable edition and any additional project requirements. Ask for a drawing, material certificates when required, test reports and an inspection and test plan with agreed witness or hold points. Record any deviations before approving the order.

Request a large-diameter gate valve quotation from Zhongyue Valve. Send your valve schedule and flange requirements through our contact page.

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