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The Stainless Steel Gearbox range MST
Manual gearboxes series MST are produced on the base of long time gearboxes “M” series production. General designed of “M” and “MST” gearboxes is the same. Gearboxes are the same only material for housing and cover are different . Customer has possibility to specify material of quadrant, input shaft and hand wheel. Gearboxes are marked SLO48. All dimensional and technical parameters are the same for gearboxes type “M and MST”. Dimensional drawings are the same for both product lines.
SMaterial specification:
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Cover
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Stainless steel 316S16
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Gearcase
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Stainless steel 316S16
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Quadrant
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SG iron BS2789 / Bronze BS1400 AB2C
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Worm shaft
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Stainless steel 316S16
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Input shaft
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Stainless steel 316S16
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Indicator cap
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Injection molded plastic
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Dome nuts
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H T steel – PTFE Coated
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Locknuts
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Stainless steel 316S16
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Stop screws washers
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Dowty bounded rubber
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Screws
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Stainless St. A4-70
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Washers
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Stainless steel 316S16
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Bearings
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Sintered steel/cooper
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Thrust Washers
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CH Alloy St. or Oilite brz.
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„O“ rings
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Nitryle rubber
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Sealings
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Three bond TB1133E/Polypropylen
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Dowel
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BS EN ISO8734
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Shaft seals
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Nitryle rubber
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Hand wheel
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Stainless steel 316S16
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Performance specification and dimensions part 1:
| Gearbox size | M07St | M10St | M12St | M14St | M15St | M16St | M20St |
| Maximal output torque on the valve 1. Nm. 5.000 cycles * | 250 | 500 | 1 000 | 1 800 | 3 400 | 4 500 | 6600 |
| Maximal output torque on the valve 2. Nm. 2.500 cycles * | 300 | 600 | 1200 | 2 200 | 4100 | 5400 | 8000 |
| Factor + - 10% | 11.00 | 11.0 | 11,3 | 16,2 | 20,5 | 26,5 | 57,0 |
| Maximal input torque [Nm] 1* | 22,7 | 45.5 | 88.5 | 111.0 | 166,0 | 170,0 | 115,0 |
| Maximal input torque [Nm] 2* | 27,2 | 54.54 | 106,0 | 135.8 | 200,0 | 203,7 | 140,0 |
| Ratio | 40 : 1 | 40 : 1 | 42 : 1 | 60 : 1 | 68 : 1 | 88 : 1 | 183 : 1 |
| Turns to close | 10,0 | 10,0 | 10,5 | 15,0 | 17,0 | 22,0 | 45,8 |
| Base valve flange ISO 5210 | F05, F07 | F07, F10 | F10, F12, F14 | F12, F14, F16 | F16, F20, F25 | F16, F20, F25 | |
| Drive bush type | DB1 | DB1 | DB4 | DB7 | DB15 | DB16 | DB20 |
| Valve stem dia. (max.) to drive bush | 25,0 | 25,0 | 32,0 | 45,0 | 65,0 | 70,0 | 70,0 |
| Valve stem dia. (max.) mm. | 25,0 | 32,0 | 45,0 | 65,0 | 80,0 | 92,0 | 92,0 |
| Valve satem lenghts (max.) mm. | 51,0 | 57,0 | 72,0 | 81,0 | 92,0 | 113,0 | 115,0 |
| Extended input shaft | N/A | 205 | 240 | 260 | 325 | 350 | 328 |
| Hand wheel pin | 4 | 5 | 6 | 6 | 8 | 8 | 6 |
| hand wheel shaft diameter | 14.98 | 14.98 | 19.98 | 19.98 | 29.98 | 29.98 | 19.98 |
| 14.94 | 14.94 | 19.94 | 19.94 | 29.94 | 29.94 | 19.94 | |
| Weight [kg] | 2,6 | 4,2 | 8,2 | 14,5 | 28,0 | 41,2 | 52,0 |
| Recommended hand wheel | SR5 | SR5,SR8 SR10,SR12 | SR10,SR12 SR14, R18 R24 | SR14 R18,R24 | R18,R24, R30, R36 | R18,R24, R30, R36 | R18,R24, R30 |
Performance specification and dimensions part 2:
| Gearbox type | M30St | M40St | M50St | М55St |
| Maximal outpup torque for mode 1 - 2.500working cycles | 10 800 | 20 000 | 41 670 | 63 000 |
| Maximal outpup torque for mode 2 - 1.000working cycles | 13 000 | 24 000 | 50 000 | 68 000 |
| Factor + - 10% | 99.0 | 188,7 | 384,6 | 219.0 |
| Maximal input torque mode 1 | 109,0 | 106,0 | 108,3 | 219,4 |
| Maximal input torque mode 2 | 131,3 | 127,2 | 130,0 | 310,5 |
| Ratio | 309,1:1 | 615 : 1 | 1219,8:1 | 694.6 : 1 |
| Turns to close | 77,3 | 153,7 | 304,9 | 173,7 |
| Base valve flange ISO 5210 | F20, F25, F30 | F25, F30, F35, F40 | F25, F30, F35, F40, F48 | |
| Drive bush type/td> | DB30 | DB40 | DB50 | DB50 |
| Valve stem dia. (max.) to drive bush | 90,0 | 130,0 | 140,0 | 140,0 |
| Valve satem lenghts (max.) mm. | 124,0 | 165,0 | 180,0 | 180,0 |
| Valve satem lenghts (max.) mm. | 144,0 | 203,0 | 250,0 | 250,0 |
| Extended input shaft | 328 | -- | -- | -- |
| Hand wheel pin | 6 | 6 | 6 | 6 |
| hand wheel shaft diameter | 19.98 | 19.98 | 19.98 | 19.98 |
| 19.94 | 19.94 | 19.94 | 19.94 | |
| Weight | 84,0 | 181,5 | 294,3 | 294,3 |
| Recommended hand wheel | R18,R24, R30 | R18, R24, R30 | R18, R24, R30 | R18, R24, R30 |