Cast steel swing check valve design is in accordance with the Api 600, BS 1868 and the ASME B16.34 standards.
Face to Facet dimension: ASME B16.10 , BS 2080 and ISO 5752.
Flanged End: ASME B16.5 , 26” and larger sizes according to ASME B16.47.
Series A and Series B.
Butt-weld End: ASME B16.25
Shall wall Thickness: BS1868.
Inspection and Test: API 598 , BS EN 12266 , ISO 5208
Casting Steel Material
Visual check for cast steel material includes: surface quality, dimension, chemical properties, mechanical performance,
non-distructive testing to ensure that the comprehensive performance of raw materials comply with the relevant ASTM, BS , EN , JIS standards.
The design provides the whole structure of low flow resistence channel structure, enables the body stiffness and strenght to bear the nominal piping pressure and stress loading., the valve body wall thickness design complies with the API 600 with sufficient margin corrosion resistance for the medium.
Bonnet can be designed with a variety of seal structure of body connection to meet the needs of different operating conditions,
the structure can be equipped to connect with jacketed, flat, spiral wound or metal ring gasket, and self pressure-seal valve bonnet for Class 900/1500/2500.
Seat structure can be designed as per user requirements as a whole alloy steel materials pressed-in sealing structure,
welding sealing or screw connection in assembly. The austenitic stainless steel body material can be provided with integral seat.
Plate components include: plate, hanger, washer, gland or locking nut, locking pin. Swing check valve can be maintened on pipeline directly and its plate design applies often the conventional rigid parallel seal structure.
Seat and other materials
The choice of materials for the Seat and other seal material can be as per API 600 stadards or users design and manufacturing requirements.
Bonnet and body seal structure
Class 150, 300, 600: spiral stainless steel and flexible graphite wound gasket
Class 900 and above: metal ring gasket According to specific operating conditions ( mediaum, mediaum temperature and pressure ), other sealing material can be applied.