Through Conduit Double Expanding Slab Gate Valve

The authentic Double Block and Bleed Valve, able to grant zero leaks.


  • Double block and bleed valve
  • Robust design
  • Suitable for high pressure, high temperature
Through Conduit Double Expanding Slab Gate Valve

ATV manufactures a full range of Through Conduit Double Expanding Gate valves for on-land applications in the Oil & Gas production, processing and transmission.

Through Conduit Double expanding Gate Valves are double block and bleed valves as they can grant zero leak towards the body cavity with pressure on the upstream and downstream side, even when the valve is fully open. Solid particles cannot penetrate into the body, both when the valve is in the open or in the close position. Furthermore, they provide superior bubble tight sealing capabilities and unmatched robustness in harsh services with high pressure and high temperatures. The full bore through conduit design minimizes the turbolence of the flow and when the valve is open the pressure drop is equivalent to that produced by a pipe with the same diameter and length. Moreover, the valve is perfectly suitable for pigging operations. 

ATV supplies the through conduit double expanding gate valves in a wide range of materials and configurations to meet any specific need of the application and customer's requirements. Optional features are available for seat and stem seals, hardfacings and end connections. Materials are sourced from qualified suppliers on the base of specifications that reflect the industry standards (ASTM, NORSOK, BS, DIN or others), but do also incorporate additional requisitions resulting from long experience.

Through Conduit Slab Gate valves are suitable for manual operation or for power assisted operation. ATV takes full responsibility in selecting the most suitable size for operating conditions. However, ATV welcomes customers supplied items too: in such a case ATV responsibility is limited to the assembling of the actuator on the valve and testing of valve and actuator system. On request, ATV may participate in the actuator selection together with the customer. 

ATV designs, manufactures and tests its products in accordance with all the relevant Industry standards and codes (API, ANSI, ASME, BS, ISO, NACE, PED and others). ATV through conduit double expanding gate valves can be manufactured to conform to API 6A product specification level PSL 3/3G and pressure tested to either API 6A or API 6D requirements.

ATV stresses its willingness to produce engineered valves; therefore, it welcomes requests for special size, class and design requirements. 


Through Conduit Double Expanding Slab Gate Valve - Specifications


APPLICATIONS Upstream applications Pipelines, rigs, platforms, skids, production plants
APPLICABLE STANDARDS API 6A, ASME VIII Division 1 and 2, ASME B16.34, ASME B16.10, ASME B16.5, NACE MR0175 and other diffused Industry standards API 6D, ASME VIII Division 1 and 2, ASME B16.34, ASME B16.10, ASME B16.5, NACE MR0175 and other diffused Industry standards
RANGES 1 13/16” ÷ 9”, Class API 3000 and 5000, 1 13/16” ÷ 7 1/16” Class API 10000, 1 13/16” ÷ 5 1/8” Class API 15000. Any other size upon application. 2” ÷ 60” Class ANSI 600, 2” ÷ 48” Class ANSI 900, 2” ÷ 36” Class ANSI 1500, 2” ÷ 20” Class ANSI 2500. Larger sizes available on request.


Forged body
Cast body
Bolted bonnet
Full bore
Standard acting (Fail Safe Open)
Double Block and Bleed (DBB)
Metal seated
Wear resisting hardfacing on sealing surfaces
Rising stem design
Fire-Safe design
Qualification to API 6A Appendix F PR2
Local position indicator
In-line maintenance


Flanges (to API 6A)
Flanges (to ASME B16.5 up to 24” and B16.47A for 26” and larger)
Compact flanges (to Norsok L005)
Studded flanges
Buttwelded ends (to ANSI 16.25)
Hub ends for clamped connections (as per customer requirement)


Carbon steel with partial or full CRA overlay on the wetted areas
Low alloy carbon steel with partial or full CRA overlay on the wetted areas
Stainless steel
Duplex or Superduplex stainless steel
Nickel Alloy


Gear and Handwheel
Electric Multi-Turn


Reverse acting (Fail Safe Close)
CRA Overlay, full or partial
Seat skirts
Inside screw non rising stem
Yoke extension for underground installation
Remote position indicators (LVDTs and/or limit switches)

Advanced Technology Valve S.p.A.

Headquarters and manufacturing plant:
Via Ombriano 2
I-23823 Colico (LC), Italy
Tel. +39 0341 932111
Fax +39 0341 930785

Our Mission

We provide flow control solutions (valve and actuators) with the highest standards of reliability and performance to the most critical applications of the Oil & Gas upstream and downstream industry, Oil & Gas transmission, Power industry.