Subsea Through Conduit Double Expanding Gate Valve

The authentic Double Block and Bleed Valve, that grants zero leaks.


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

ATV manufactures a full range of Through Conduit Double Expanding Gate Valves for Offshore & Subsea applications in the Oil & Gas exploration and production, suitable for water depths up to 3000 m (10000 ft).

Through Conduit Double expanding Gate Valves are double block and bleed valves as they can grant zero leak with pressure on the upstream and downstream side towards the body, 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 exanding gate valves in a wide range of materials and configurations to meet any specific need of the application and customer’s requirements.  ATV valves are manufactured with hardfaced sealing surfaces with Tungsten Carbide Coating (TCC). Many 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 (API, ASTM, BS, DIN, NORSOK or others), but do also incorporate additional requisitions resulting from long experience.  

The through conduit double expanding gate valves may be manually operated (by ROV or by diver, if feasible) or fitted with linear hydraulic actuators, with or without ROV override. ATV offers the highest level of performance and reliability being its actuators engineered to grant safe and extended operating life. 

ATV designs, manufactures and tests its products in accordance with all the relevant Industry standards and codes (ANSI, API, ASME, BS, DNV, ISO, NACE, PED and others). The double expanding gate valves can be manufactured to conform up to product specification level PSL 4.

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


Subsea Through Conduit Double Expanding Gate Valve - Specifications


APPLICATIONS Production manifold, flowline, Pipeline End Manifold (PLEM), Pipeline End Termination (PLET), Emergency Shut Down, Subsea Isolation, HIPPS, HPHT Subsea Pipeline, Riser, Pipeline End Manifold (PLEM), Pipeline End Termination (PLET), HIPPS
APPLICABLE STANDARDS API 17D, ISO 13628-4, ASME VIII, NACE MR0175 and other diffused Industry standards API 6DSS, ISO 14723, ASME VIII, ASME B16.34, ASME B16.10, ASME B16.5, NACE MR0175 and other diffused Industry standards
RANGE 2 1/16” ÷ 9”, Class 3000 psi and 5000 psi, 1 13/16” ÷ 7 1/16” Class 10000 psi, 1 13/16” ÷ 5 1/8” Class 15000 psi, 1 13/16” ÷ 3 1/16” Class 20000 psi. Any other size upon request. 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.
WATER DEPTH Up to 3000 m (10000 ft). Greater depth upon application. Up to 3000 m (10000 ft). Greater depth upon application.


Forged body
Bolted bonnet
Full Bore
Standard acting (Fail Safe Open)
Double Block and Bleed (DBB)
Metal seated
Wear resisting hardfacing on sealing surfaces
CRA overlay, full or partial
Rising stem design
Qualification to PR2
Local position indicator


Flanges (to API 17D / ISO 13628-4)
Flanges (to ASME B16.5 up to 24” and B16.47A for 26” and larger)
Compact flanges (to Norsok L005)
Studded flanges
Buttwelded ends
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 and superduplex stainless steel
Nickel Alloy


ROV operated gear


Reverse acting (Fail Safe Close)
Seat skirts
ROV bucket extension
Local position indicator extension
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.