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SRi tandem ball valve is constituted by two balls, like the Double Block and Bleed ball valve, but the face-to-face dimension is in accordance with ASME B16.10.

On site, a SRi tandem ball valve can replace a single ball valve without modification of the pipe meaning two ball valves instead of only one.


ND 2" (DN50) to ND 24" (DN600)


ASME CLASS 150 to 2500
DIN-PN PN 10 to 64


Carbon & low alloy Steels
Stainless steels
Duplex & Super Duplex
Nickel Alloys

Design features

API 6D/6A design & construction
API 6D & ASME B1610 face to face
Antistatic device
Double block and bleed (DBB)
Drain plug
Connection ends upon request
Firesafe design
O-ring seals
Self-Relieving seat
Soft seat insert
Trunnion mounted
Vent plug

On request

Full/reduced/customize bore
Manual or actuated operation

Optional Design features

Automatic bleeding system
By-pass system
Double Piston Effect (DPE)
Double Isolation & Bleed (DIB)
ENP on seat/ball/stem/body
Extended stem
Heating jacket
Lifting lugs /valve support
Locking device
Metal to metal seats
Overlay on seat pocket
Overlay on dynamic seal pockets
Overlay on all wetted parts
Polymeric lip-seals
Single Piston Effect
Stem injection fitting
Seat injection fitting
Transition pups pieces BW ends

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