Franklin Expanding Plug Valves.


Where positive, proven isolation is essential, look no further than Franklin’s Duraseal™ Double Block and Bleed Expanding Plug valve.  We are the UK’s only stockist and distributor for this field tested and trusted range of products.  The Franklin Duraseal™ is the choice for applications requiring frequent, verifiable isolation and testing of liquids.  The design of the Franklin Duraseal™ gives a mechanical seal on the upstream and downstream seat of the valve, which means the valve also incorporates a differential thermal relief valve or DTR.

Product Applications


Verifiable shutoff, preventing cross contamination, zero leakage rate make the Duraseal™ the chosen valve in these demanding industries and applications.

Biofuels Product Isolation. Multi-Product Manifolds. Prover Loops.
Custody Transfer Units. Terminals. Tank Farms (Oil Depots).
Aviation Fueling Systems. Offshore platforms. Blending Units.


The short films below give more information about the advantages of the Franklin Duraseal™

D&D International Valves Ltd. Franklin Expanding Plug DBB valve stock range - Click to open
Design: API 6D, ASME B16.34, API 6FA
Body Material: ASTM A216 Gr WCB with 3 mil Chrome plating
Plug Material: ASTM A216 Gr WCB with ENP
Bonnet and Lower plate material: ASTM A350 Gr LF2
Slip Material: Ductile Iron: A536 GR 80-55-06 with FKM-GF slip seal
Size: 4" to 12" Class 150