Back-pressure diaphragm valve (KTSM), hereafter referred to as the valve, is designed to provide fluid circulation through coil tubing (CT) if the equipment located below the valve does not allow the fluid to circulate, and ensures emergency depressurization inside CT.
The valves are manufactured with 45 and 54 mm nominal diameters.
Basic parameters and dimensions:
| Parameter | Значение | |
| KTSM – 45 | KTSM – 54 | |
| Working pressure, MPa, not greater than | 30 | |
| Shear pressure of pins, MPa, not greater than | 15 | |
| Valve length, L, mm, not greater than | 295 | 330 |
| Case full diameter, D, mm | 45 | 54 |
| Bore diameter, d, mm, not less than | 12 | 15 |
| Diaphragm fracture pressure, MPa, not greater than: – inner choke No 1, o11 mm – inner choke No 2, o10.5 mm |
24–26
27–30 |
|
| Fluid temperature, °С, not greater than | 100 | |
| Weight, kg, not greater than | 2.5 | 3.5 |
| Working fluid | Drilling fluid, oil, water | |
| Connecting thread dimensions as per GOST 24705-81, 8724-81, 9150-81 | М 30 ? 2 | М 42 ? 2 |