Subsea Through Conduit Slab Gate Valve

Unmatched robustness in harsh services with high pressures and high temperatures.


  • Robust design
  • High sealing capability
  • Suitable for high pressure, high temperature
Subsea Through Conduit Slab Gate Valve

ATV manufactures a full range of Through Conduit Slab 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 Slab Gate valves provide superior bubble tight sealing capabilities in gas service and unmatched robustness in harsh services with high pressure, high temperatures and solid particles. 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 considers the through conduit slab gate valve  the preferred choice for HIPPS applications, in consideration of the closing pressure assisted feature. 

ATV supplies the through conduit slab gate valves in a wide range of materials and configurations to meet any specific need of the application and customer’s requirements.  ATV slab gate valves are manufactured with hardfaced sealing surfaces with Tungsten Carbide Coating (TCC). 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.  

The through conduit slab gate valves may be manually operated (by ROV or by diver, if feasible) or fitted with linear hydraulic actuators, fail as is or fail safe, 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 (API, ANSI, ASME, DNV, BS, ISO, NACE, PED and others). The slab gate valves can be manufactured to conform to API 6A and API 17D product specification level PSL 4 and pressure tested to either API 6A or API 6DSS requirement.

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


Subsea Through Conduit Slab 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
STANDARD API 6A, API 17D, ASME VIII Division I and II, NACE MR0175 and other diffused Industry standards API 6DSS, ASME VIII Division 1 and 2, ASME B16.34, ASME B16.10, ASME B16.5, NACE MR0175 and other diffused Industry standards
RANGE 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.
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
Rising stem design
Backseat in open and/or close position
Qualification to API 6A Appendix F PR2 and API 17D
Local position indicator


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
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
Linear hydraulic actuator w/ or w/o ROV Override
Electric multiturn


Reverse acting (Fail Safe Close)
Seat skirts
Double Block and Bleed (DBB)
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.