Franklin Valve is a privately held company located in Houston Texas that manufactures the DuraSeal Double Block and Bleed Plug Valve, the DuraSeal 4-Way Diverter Valve, and the DuraGate Symmetrical Expanding Gate Valve all three to order per customer specification. We place the highest value on product quality and customer service and are committed to positioning Franklin’s DuraSeal as the premier DBB valve on the market.

All of Franklin valves are proudly manufactured and tested in the U.S.A with parts sourced globally. Franklin Valve manufactures, repairs, and provides maintenance services on reduced and full bore DBB designs.

DBB Stock Offerings

Reduced Port / Full Bore

Released in 2016 the Franklin DuraSeal 4-Way Diverter Valve incorporates proven performance features and characteristics: ASME B16.34, Multi-Turn Actuation, In-Line Maintenance, and Automatic Pressure Gauge.

Reduced Port
2-36” Class 150
2-24” Class 300
2-20” Class 600
2-8” Class 900
Full Bore
2-24” Class 150
2-18” Class 300
2-12”, 16” Class 600


4-Way Stock Offerings

4”, 12”, 16” Class 150
2-12”, 16” Class 300
3-10” Class 600

Released in 2020 Franklin introduces an innovative technology into the market with the Duragate™ Symmetrical Expanding Gate Valve. The new Duragate’s™ patented design solves several inherent issues with current industry offerings. Franklin now proudly offers the first truly bidirectional flow S.E.G. for extended service in demanding sectors. Design incorporated proven performance features and characteristics: API 6D, API 6FA, DBB/DIB-1, True Bi-Directional Design, and In-Line Serviceable Seats.

DuraGate Stock Offerings

16-36” Class 150
12-36 Class 300

Bottom line is our service ability is what sets Franklin apart from General TwinSeal and other DBB manufacturers; same product, better service. The DuraSeal DBB plug valve meets the requirements under the ‘Buy American Act’; is API 6D monogrammed, API 6FA (firesafe), API 591 (destructive), API 622 (emissions), PED/CE certified in an ISO 9001 approved facility. Franklin Valve is globally distributed, represented and accepted with a number of high-profile end users and Original Equipment Manufacturers. Franklin Valve is positioned for continued growth and market share expansion. Let us be a part of your strategic growth as well.


Proudly Representing:



Contact Information

North American Machine Works
789 Ashland Ave
Folcroft, PA  19032

Phone:  610-461-5500
Fax:  610-461-5572


Additional Links

Site Map

Privacy Policy