API 602, BS5352, MSS SP-118 Forged Steel Check Valves – Flanged, Flangeless, Threaded and Welding Ends
Forged steel check valves of Sangong are available in three bonnet designs.
The first design is the Bolted Bonnet, with male-female joint, spiral wound gasket, made in F304l/graphite. Ring joint gasket is available if required. The second design is in the welded bonnet, with a threaded and seal welded joint. On request a full penetration strength welded joint is available. The third design is the pressure seal bonnet, with a threaded and pressure seal bonnet joint.
The forged check valves are also available in three different design configurations. These are piston check valve type, ball check or swing check types. Besides, construction can be as follows:
1.Full port if required or conventional port, reduce port
2.Inside spring can be equipped if required
3. Disc can change for soft seal disc and ball disc.
4. Socket weld ends conform to ASME B16.11
Screwed ends(NPT) conform to ANSI/ASME B1.20.1
Butt-welded conform to ANSI B16.25
Flanged check valve ends conform to ANSI B16.5
Design and manufacture as per: API 602, BS5352, MSS SP-118
Test and inspection as per: API 598
API 602 – Compact Steel Gate, Globe, Check Valves – Flanged, Threaded, Welding, and Extended-Body Ends. The standard covers threaded-end, socket-welding-end, butt-welding-end, and flanged-end compact carbon steel valves in sizes NPS4 and smaller.
BS 5352 – Specification for steel wedge gate, globe and check valves 50 mm and smaller for the petroleum, petrochemical and allied industries
MSS SP-118 – Compact Steel Globe and Check Valves – Flanged, Flangeless, Threaded and Welding Ends (Chemical and Petroleum Refinery Service)
This MSS Standard Practice covers flanged end, threaded end, socked-welding end, and butt-welding end compact steel globe and check valves. The term “compact” is used to identify the valves covered by this Standard Practice as reduced seat port valves. Valve sizes correspond to nominal pipe sizes listed in ASME B36.10M and B36.19M. Flanged, flangeless, and butt weld end valves are limited to sizes NPS 4 and smaller; threaded and socked welding end valves are limited to sizes NPS 2 1/2 and smaller. Valves covered under this Standard Practice shall meet the requirements of ASME B16.34, “Standard Glass”.
API 598 Valve Inspection and Testing. The standard covers inspection, supplementary examination, and pressure test requirements for both resilient-seated and metal-to-metal seated gate, globe, plug, ball, check, and butterfly valves. Pertains to inspection by the purchaser and to any supplementary examinations the purchaser may require at the valve manufacturer’s plant.