While not a valve in the traditional sense, check valves serve an important application namely to prevent flow in one direction while allowing it in the other. A check valve is self-actuated and designed to prevent fluid from flowing back into the system (prevent reverse flow). Real-life applications include preventing back flow into an injection line or into a pump. The fluid flow opens the valve by forcing a disk or ball in one direction. When the flow stops, the disk or ball is seated and closes the valve. They can be installed in horizontal or vertical upward flow piping.

Part Name Carbon Steel Alloy Steel Stainless Steel Aluminium Bronze
Materials Specification
Body A 216 WCB / WCC A 352 LCB /LCC A 217 WC6/WC9/C5/C12 A 351 CF8/CF8M/CF3/CF3M/CF8C Aluminium Bronze B 148 955 / 95
Bonnet A 216 WCB / WCC A 352 LCB /LCC A 217 WC6/WC9/C5/C12 A 351 CF8/CF8M/CF3/CF3M/CF8C Aluminium Bronze B 148 955 / 95
Seat Ring A 216 WCB / WCC+13% Cr. A 351 C F8 A 217 WC6/WC9/C5/C12+13% Cr/A 217 CA 15 A 351 CF8/CF8M/CF3/CF3M/CF8C Intigral B 148 955 / 95
Plug A 216 WCB+13% Cr. A 351 C F8 A 217 WC6/WC9/C5/C12+13% Cr. A 351 CF8/CF8M/CF3/CF3M/CF8C Aluminium Bronze B 148 955 / 95
Spindle A 276 TP 410 A 276 TP 304 A 276 TP 410 A 276 TP 304/316/304L/316L/321 Aluminium Bronze B 148 955 / 95
Gland Flange A 105 / CS A 105 / CSA352/LCB/LCC A 105/CS/217WC6/WC9/C5/C12 A105³/CS³ /A351 CF8/CF8M/CF3 Aluminium Bronze B 148 955 / 95
Back Seat A 276 TP 410 A 276 TP 304 A 276 TP 410 A276 TP 304 / 316 / 304L /316 L /321 Aluminium Bronze B 148 955 / 95
Gland A 276 TP 410 A 276 TP 304 A 276 TP 410 A276 TP 304 / 316 / 304L /316 L /321 Aluminium Bronze B 148 955 / 95
Joint Sutd A 193 B7 A 320 L7 A 193 B16 A 193 B7³ / B8M B7/8/8M A193
Joint Stud Nuts A 194 2H A 194 7 A194 7 A 194 2H³ /B8M B7/8/8M -A194
Gland Stud A 193 B7 A 320 L7 A 193 B16 A 193 B7³ / B8M B7/8/8M A193
Gland Stud nuts A 194 2H A 194 7 A194 7 A 194 2H³ /B8M B7/8/8M A194
Gasket Spiral Wounded SS 316 / 316L / 304 / 304L / 321 / A-20 with grafoil filler & PTFE filler Spiral Wounded SS 316 / 316L / 304 / 304L / 321 / A-20 with grafoil filler & PTFE filler Spiral Wounded SS 316 / 316L / 304 / 304L / 321 / A-20 with grafoil filler & PTFE filler Spiral Wounded SS 316 / 316L / 304 / 304L / 321 / A-20 with grafoil filler & PTFE filler Spiral Wounded SS 316 / 316L / 304 / 304L / 321 / A-20 with grafoil filler & PTFE filler ASTM/ A351
Stem Packing Braided Graphite and Die Formed Graphite ring / PTFE V-Ring Braided Graphite and Die Formed Graphite ring / PTFE V-Ring Braided Graphite and Die Formed Graphite ring / PTFE V-Ring Braided Graphite and Die Formed Graphite ring / PTFE V-Ring Braided Graphite and Die Formed Graphite ring / PTFE V-Ring ASTM A351
Yoke Sleeve SG Iron / A439 Gr.D2 / Bronze SG Iron / A439 Gr.D2 / Bronze SG Iron / A439 Gr.D2 / Bronze SG Iron / A439 Gr.D2 / Bronze SG Iron / A439 Gr.D2 / Bronze ASTMA439/bronze
Hand wheel Malleable Iron /SG Iron Malleable Iron/ SG Iron Malleable Iron/SG Iron Malleable Iron/SG Iron Maleable Iron /SG Iron standard
Features and Benefits

 Counter Weight arrangement
 Hydraulic Cylinder Arrangement
 IBR Certified
 NACE MR 0175 & MR 1030
 Lift type check valves will be supplied for the sizes for NPS < 2″ Rest of the sizes are un swing type design.

Design Features

Design and manufaturing

 BS 1868

Inspection and Testing.

 API 598, BSEN 12266 Part – 1 & 2

End Flanges Dimenstion

 ASME B 16.5(for NPS < 24″)Series A & B(for NPS > 24), MSS SP-44(for NPS > 24)

BW End Dimension :

 ASME B 16.25

Face to Face & End to End Dimension

 ASME 16.10, BS 2080

Gasket Design

 ASME B 16.20

Dick Design

 Gravitational Acceleration

Tolerance

 Face to Face : ± 2.0mm for NPS ≤ 10″& ± 3.0mm for NPS > 10″