Subsea Swing Check Valve

A valve designed to prevent the backflow of fluids, often used as isolation valve


  • Robust design
  • Automatic shutdown to protect pumps or compressors in case of reverse flow
  • Piggable on application
Subsea Swing Check Valve

ATV manufactures a full range of Swing Check valves for the subsea flowlines, PLEMs, PLETs applications, suitable for pressure ratings up to Class 15000 psi and ANSI Class 2500, and water depths up to 10000 ft (3000 m). 

The swing check valves can be regular port or full port, this latter being the option when the valve shall be piggable having an optimized design of body cavity and flapper.

ATV Swing Check valves can be supplied with clapper lifting device operated by a ROV tool (or by diver in shallow water). Lost motion devices can be supplied to reduce the wear on the shafted seals. Sensors for remote indication of clapper position are also available.

ATV supplies the subsea swing check 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 cobalt-chromium alloys. Materials are sourced from qualified suppliers on the base of specifications that reflect the industry standards (API, ASTM, BS, DIN, NORSOK and others), but do also incorporate additional requisitions resulting from long experience.

ATV designs, manufactures and tests its products in accordance with all the relevant Industry standards and codes (ANSI, API, ASME, DNV, BS, ISO, NACE, PED and others). 

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


Subsea Swing Check Valve - Specifications


APPLICATIONS Upstream applications (PLEM, PLET, etc.), SSIV Subsea pipelines and transmission systems
APPLICABLE STANDARDS API 17D, ISO 13628, ASME VIII, ASME B16.34, ASME B16.10, ASME B16.5, 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” ÷ 11”, Class 3000 psi and 5000 psi, 1 13/16” ÷ 7 1/16” Class 10000 psi, 1 13/16” ÷ 4 1/16” 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
Cast body
Bolted bonnet
Full bore
Welded-in or removable seat
Metal seated
Wear resisting hardfacing on sealing surfaces
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)
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 mechanical gear for pigging operations


Reduced bore
Conduit clapper
Clapper position switches and transmitter
Hydraulic dampener
Lock open lever / clapper position indicator

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.