Underground Ball Valves
Underground ball valves require buried-service design details such as stem extension, external coating, drain/vent extension and above-grade operating access.
Define the operating envelope before selecting the valve construction.
Underground ball valves require buried-service design details such as stem extension, external coating, drain/vent extension and above-grade operating access.
Base valve construction still matters
After the service condition is defined, select the underlying floating, trunnion mounted, top entry, fully welded or DBB design according to size, pressure, maintenance access and isolation duty.
Information to include in the RFQ
Include burial depth, required stem extension, coating system, drain/vent extension and operator or actuator arrangement in the RFQ.
Key design questions for underground ball valves.
Use these points to define the project design envelope and qualification requirements.
Burial Depth
Specify burial depth and the required operating elevation from valve centerline to the above-grade interface.
External Coating
Define the required buried-service coating system, surface preparation and dry film thickness.
Drain / Vent Extensions
Specify whether body drain, cavity vent or sealant injection points must be extended above grade.
Operating Interface
Define the required gear operator, actuator or stem-extension arrangement and above-grade access requirements.
Technical documents for project review.
For technical evaluation, request the applicable product documents and inspection records for the offered valve configuration.
Product Photos
Additional finished-valve, nameplate and component photos are available for the selected valve configuration.
GA Drawing / Datasheet
GA drawings and datasheets are prepared for the selected size, pressure class and valve configuration.
Testing & Inspection Records
Inspection documentation can include pressure testing, dimensional inspection, PMI, NDE/NDT and coating records as required by the project.