Spanning static torque from 8.1 kN.m on the ATD-214H to 110.8 kN.m on the ATD-330H, the ATD air-tube and push-disc clutch is the dry friction element that connects and disconnects the rig drawworks, mud pump and workover drivetrain. Seven covered models run at drum speeds up to 2200 rpm on the small ATD-214H and 1100 rpm on the heavy ATD-330H, with the press disc moving 2 to 6 mm across the range and engagement supplied at 0.7 MPa shop air. Pneumatic actuation gives a soft take-up on high-inertia loads and slips before the drivetrain sees a locked overload, which is why the same series spans a small workover pump clutch and a deep-well drawworks feed.
The series steps from the 8.1 kN.m ATD-214H through the 17.4, 34.7 and 52 kN.m air-tube sizes to the 110.8 kN.m ATD-330H, so a small workover drum and a deep-well drawworks draw from one product family rather than bespoke designs.
Drum speed ratings run from 1100 rpm on the torque-heavy ATD-330H to 2200 rpm on the ATD-214H, matching high-speed pump shafts against slow, high-torque drawworks input shafts without a separate speed-adapter stage.
Engagement is on plant air at 0.7 MPa, and the press disc advances 2 to 3 mm on the smaller models to 5 to 6 mm on the ATD-330H; that travel sets the actuator stroke the rig pneumatic panel is plumbed around.
The friction plates run dry, so there is no oil bath to seal, change or top up. The air tube and disc pack is the only wear group, and the split housing lets it be swapped without dropping the clutch shaft from the skid.
Friction engagement transmits torque until the load exceeds the plate grip, then slips rather than locking the drivetrain solid. On a jammed mud pump or a stalled drawworks drum that protects the engine and transmission ahead of the clutch instead of shearing a coupling.
The air tube, friction lining and press disc are consumables common across the ATD range, so a rig running mixed-model drawworks and pump clutches stocks one lining set and one air-tube family. Control valves and the 0.7 MPa actuator are specified at order time.
| Product | Series of Clutch |
|---|---|
| Product line | Assembly Parts |
| No. | model | (kN.m) Static torque | (rpm) Max. rotary speed | (mm) Press disc moving distance | (MPa) Working pressure |
| 1 | ATD-124H | 17.4 | 1400 | 2~3 | 0.7 |
| 2 | ATD-224H | 34.7 | 1400 | 3~4 | |
| 3 | ATD-324H | 52 | 1400 | 4~5 | |
| 4 | ATD-218H | 16.9 | 1650 | 2~3 | |
| 5 | ATD-318H | 25.4 | 1650 | 3~4 | |
| 6 | ATD-214H | 8.1 | 2200 | 2~3 | |
| 7 | ATD-330H | 110.8 | 1100 | 5~6 |
For a useful technical response, include the target well conditions, operating depth or pressure, expected quantity, destination and any required configuration.
Send an InquiryAvailable configurations can be matched to the equipment model, operating conditions and project requirements.
Buyers evaluating the clutch series usually ask about torque rating and drive integration.
The ATD air-tube and push-disc clutch is the dry friction element that connects and disconnects the rig drawworks, mud pump and workover drivetrain. Engagement on 0.7 MPa shop air brings the high-inertia load up softly, and the friction pack slips before the drivetrain sees a locked overload, which protects the engine and transmission ahead of the clutch instead of shearing a coupling.
Different from traditional mechanical clutches, oilfield pneumatic clutches adopt dry-type non-lubrication design with fast response, no self-engagement risk and stable operation. They feature flexible power transmission, strong overload buffering capacity, no oil pollution and simple daily maintenance, fully adapting to high-frequency and high-load harsh oilfield working conditions.
Model selection is based on supporting equipment type, power grade, working torque and operating frequency. Small-size clutches suit conventional workover rigs and small mud pumps; medium and large-size high-torque clutches are applicable to deep and ultra-deep well drilling rig drawworks and high-power supporting equipment.
Yes. The full-series products adopt full-climate adaptive design with dust-proof, anti-corrosion and wide-temperature resistant performance. Core components resist low-temperature aging and high-temperature thermal decay, ensuring stable pneumatic control and friction transmission at -40℃ ~ +55℃, adapting to all harsh oilfield working environments.
Yes. The configuration is settled against the driven equipment before the order: model across the ATD range (8.1 to 110.8 kN.m static torque), press-disc travel (2 to 6 mm), the 0.7 MPa air supply and control valves, and the split-housing lining set are matched to the drawworks or mud-pump shaft, then written into the quotation and the factory test report.
Commercial terms are confirmed in the quotation for the exact configuration, quantity and destination.
Built to API Spec 7K at the Jingzhou plant under ISO 9001:2015 quality management; each ATD clutch has its air tube held at 0.7 MPa for leakage, press-disc travel measured against the 2 to 6 mm model spec and the friction pack run on a torque bench before dispatch. The certificate scope is listed in the quotation.
Component manuals, dimensional drawings and NDT reports are supplied; the mounting interface dimensions are provided for integration with the client's rig.
Confirmed in the quotation according to configuration, quantity and destination.
Manuals, conventional spare parts and remote technical guidance are included; on-site commissioning and operator training can be arranged on request.
Payment schedule, Incoterms, port and packaging are agreed in the sales contract.
A recommended spare-parts list for the first operating period is provided with the quotation.
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