Detailed Product Description

Fully Welded Undermine or Underground Type Ball Valve with with Stem Extension

DGV fully welded trunnion mounted ball valves are widely used in oil, nature gas pipeline and the industries of liquefied gas, coal gas, etc. as an open/close control valve. The fully welded body design has no bolted bonnet or body joints that can ensure no potential body joint leak for environmental concern. Also forged steel body assures uniform fine grain structure and toughness free from inevitable cast valves defects such as porosity, gas hole. The design of seat seal uses unique two-level soft seal and metal to metal seal to form triple sealing; the design of seat piston is accurately calculated to ensure seal reliability with small open/close torque and easy operation.

Applicable Standard

Design Standard:  API 6D, ASME B16.34, BS 5351, API 608, MSS SP-72

Face to Face:     ASME B16.10, API 6D, EN 558

End Flange:       ASME B16.5, DIN 2501

Buttwelding Ends:  ASME B16.25.

Inspection and Test: API 6D, API 598

Products Range

Size:                        2" ~ 24"(DN50 ~ DN600)

Rating:                    ANSI 150lb ~ 1500lb

Body Materials:      Forged carbon steel, Forged Stainless Steel

Trim:                       A105+ENP, 13Cr, F304, F316

Operation:            Lever, Gear, Electric, Pneumatic, Hydraulic               

Design Features

Full bore or reduced bore design

Forged body and ball, welded body

Double block & bleed

Trunnion mounted ball, Blowout-proof stem

Forged body and ball, welded body

Emergency sealant injection

Cavity pressure self relief

Fire safe design to API 607/API 6FA

Anti-static to BS5351