Valve Selection Guide

Practical valve selection support for process piping applications

Step 4 of 5Valve Type & Override

Valve Type Selection

Computed live from your service, function, size and class. You can override the recommendation.

Ball Valve

Recommended

Trunnion Mounted — Reduced Bore

Based on input conditions and engineering logic.

Rule: NPS 3"–12": Trunnion ball valve preferred — lower operating torque than floating ball at higher pressures and sizes.

Recommended
300#Recommended

Based on input conditions and engineering logic — Group 1.1 - Carbon Steel: 300# rated 44.2 barg at 120 deg C (screening factor 0.864; basis ASME B16.5 Table 2-1.1)

ASME B16.5 Caution: Design pressure (40 barg) is within 15% of the Class 300 Group 1.1 - Carbon Steel screening limit (44.2 barg at 120 deg C). Confirm final P-T rating against ASME B16.5 Table 2-1.1.

Recommended
Reduced BoreRecommended

Based on input conditions and engineering logic — cost-optimised default for ball valves.

Recommended
Why this was selected
Ball valve (trunnion mounted) is selected for mid-range sizes (3"–12"). At these sizes and pressures, a trunnion-mounted ball offloads seat loading via fixed trunnion supports, reducing operating torque and improving seat life. Full bore options give negligible pressure drop.

Learning moment

Valve type is driven by function first (isolation, throttling, check, relief), then refined by service, size and class. For ball valves, Reduced Bore is the cost-driven default; specify Full Bore only when an engineering requirement (piggable, ESD/HIPPS, subsea, low-dP) applies.

API 615

API 615 §6.2

API 6D

API 6D §5.2

API 608

API 608

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Engineering Decision Support Tool - Screening / Internal Review Use unless independently validated.

Outputs are generated for engineering screening and decision support only. Final responsibility for standards compliance, engineering judgment, specification verification, and approved project use remains with the user organization and qualified reviewing engineer.