Check Valves
CHECK VALVES prevents reversal of direction of flow through a line. They offer quick automatic reactions to flow changes, the pressure of the flowing fluid keeps the valve open & any reversal of flow closes it.
SERVICE RECOMMENDATIONS
• Minimum resistance to flow
• Low velocity services, especially liquids
• Infrequent change of directions in backflow prevention
• Used generally with CHECK VALVES
CAST STEEL CHECK VALVE BOILTED COVER SWING TYPE/LIFT TYPE
LIFT CHECK VALVE
When SWING CHECK VALVES are used in systems in which frequent flow reversals may be encountered the valves may have a tendency to chatter. This can be corrected by equipping the valve with an outside lever & weight. It may be used to add weight to disc quicker closing against backflow preventing water hammer & excessive shock pressure.
The lever & weight can be adjusted so that the disc will open at the slightest pressure, or else to prevent the disc from opening until a desired pressure is attained
SERVICE RECOMMENDATIONS
• Frequent change of direction
• Increased flow resistance
• Prevention of backflow
• Used with Globe & Angel Valves
Dimention & Details
| SR No. | DESCRIPTION | MATERAIL | ||
|---|---|---|---|---|
| Body | ASTM A 216 GR. WCB | ASTM 351 GR CF8/CF8M | ||
| Cover | ASTM A 216 GR. WCB | ASTM 351 GR CF8/CF8M | ||
| Disc | ASTM A 216 GR. WCB + 13% Cr. STEEL Facing | ASTM 351 GR CF8/CF8M | ||
| Seat Ring | AISI 410 | Integral With Body | ||
| Hinge | ASTM A 216 GR. WCB | AISI 304/316 | ||
| Hinge Pin | AISI 410 | AISI 304/316 | ||
| Gasket | Spiral Wound Metallic Gasket | AISI 304/316 | ||
| Bolts/. Nuts | ASTM A 193 GR. B7 / A 194 GR.2H | ASTM A 193 GR. B7 / A 194 GR.2H | ||
ALTERNATE MATERIAL OF CONSTRUCTION :-
WC6, WC9, LCB, LC6 CF3, CF3M, CN7M, CG3M, HESTALLOY C & B, MONEL, TITANIUM
CLASS 150
| SIZE | 25 | 40 | 50 | 65 | 80 | 100 | 150 | 200 | 250 | 300 |
| A | 127 | 165 | 203 | 216 | 241 | 292 | 356 | 495 | 622 | 698 |
| H | 85 | 120 | 152 | 190 | 205 | 228 | 280 | 330 | 356 | 482 |
All the dimensions are in M.M.
CLASS 300
| SIZE | 25 | 40 | 50 | 65 | 80 | 100 | 150 | 200 | 250 | 300 |
| A | 203 | 241 | 267 | 292 | 318 | 356 | 445 | 543 | 622 | 711 |
| H | 150 | 160 | 178 | 216 | 229 | 254 | 317 | 368 | 381 | 495 |
All the dimensions are in M.M.
SPECIFICATIONS
| Design Standard | : BS 1868 / API 6D/ ASME B 16.34 |
| Face to Face | : ASME B 16.10 |
| Flanged Ends | : ASME B 16.5 R/F |
| Buttweld Ends | : ASME B 16.5 |
| Testing | : BS 6755 – I |
| MANUFACTURING RANGE | ||
|---|---|---|
| SIZE | PRESSURE RATING | |
| 25 MM TO 400 MM | 150 # TO 1500 # | |
| INSPECTION & TESTING | |||
|---|---|---|---|
| CLASS | SHELL | SEAT | |
| HYDROSTATIC | HYDROSTATIC | ||
| 150 # | 30 Kg/Cm2 | 22 Kg/Cm2 | |
| 300 # | 77 kg/Cm2 | 55 kg/Cm2 | |
Available on Request
• Stellite facing
• Jacketed Construction
• Sluice Gate Valve
• Valve Under “X-Ray” Quality
• Gear operated
• Motor Operated Valve