Double Eccentric Semi ball Valve

Double eccentric semi-ball valve

Double eccentric semi ball valve

Double eccentric semi ball valve is made up of eccentric body, eccentric ball and seat. Stem, while turning, can automatically centers in the common orbit. The ball and the seat are completely separated, diminishing the damage of the seat. 

Such valve is widely used for industries of steel, aluminum, paper making, gas, oil, etc.

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Product information

Product Features

1. The structure, based on eccentric principal, transmits to reach tighten, regulation, closure. The sealing is metal seal ring with hard faced.

2. The semi-ball is made of double metal, with alloy welded on the primary material, and the seat with special welding treatment. The seal surface can meet customer’s various request

3. O leakage.

4. Seat can be replaced.

Material standards

NOPartsStandardStainless steelWeak acidLow temperature
1Bottom stemASTM A182 F6aASTM A182 F304ASTM A182 F6aASTM A350 LF2/ENP
2BodyASTM A216 WCBASTM A351 CF8MASTM A216 WCBASTM A352 LCB
3BallASTM A216 WCBASTM A182 F304ASTM A216 WCBASTM A352 LCB
4Seat ringASTM A105ASTM A182 F304ASTM A105/ENPASTM A350 LF2
5Top stemASTM A182 F6aASTM A182 F304ASTM A182 F6aASTM A350 LF2/ENP
6YokeASTM A216 WCBASTM A351 CF8MASTM A216 WCBASTM A350 LCB

Technical requirements

Pressure test

PN(MPa)Max. applied pressure(MPa)Pressure Test(MPa)
Shell testmax. applied pressureLow pressure seal
1.61.62.41.760.6
2.52.53.752.75
4.04.06.04.4

Pressure test

ClassMax. applied pressure(MPa)Pressure Test(MPa)
Shell testmax. applied pressureLow pressure seal
1502.03.02.20.6
3005.07.55.5

Technical requirements

Design standardDesign standardAPI 608
End connectionANSI B16.5
Structure lengthANSI B16.10
Test and inspectAPI 608
Applied conditionsApplied mediumNatural gas, liquefied petroleum gas
Applied temperature-196℃~550℃
OperationWorm gear, Pneumatics, Electric, Pneumatic-hydraulic
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