Operating Pressure.
The working pressure range for a standard ATI Scotch Yoke Power Cylinder is as follows:
HYDRAULIC:
– MINIMUM: 500 psig (34.5 bar)
– STANDARD MAXIMUM (SMAWP): 1,500 psig (103.4 bar)
PNEUMATIC:
– MINIMUM: 50 psig (3.45 bar)
– STANDARD MAXIMUM (SMAWP): 150 psig (10.24 bar)
The minimum pressure may be lower than 500 psig and 50 psig, for hydraulic and pneumatic cylinders, respectively, due to backpressure in control circuits. For use with Higher or Lower pressures consult with ATI Representative.
NOTE: The maximum pressure is in reference to just the power modules. When assembled onto the body module the maximum pressure for the system may decrease. Please reference DS1002 Scotch Yoke Torque Table Data for maximum pressures for specific actuator models.
Temperature Limits
Operating Temperature
| System |
Operating Temperature* |
| standard |
-40℉ to +212℉ (-40℃ to +100℃) |
*For temperatures outside standard consult with an ATI Representative.
Duty Cycle & Cycle Speed
The Product is capable of intermittent duty and continuous duty when operated within recommended temperature limits with properly filtered fluid. The stroke speed is controlled by the control circuit for fluid supply and typically varies between 5 seconds to 60 seconds.
For required speeds outside the range, please consult with an ATI Representative
Fluid Type
The Product is designed and constructed of heavy-duty materials for operation in systems using petroleum-based fluids for hydraulic power. Pneumatic operation is designed for filtered nitrogen and compressed air.
For use with other fluid types please consult with an ATI Representative.
Service Life
ATI Scotch Yoke Systems can be operated with petroleum-based hydraulic fluids or filtered pneumatic fluid for up to 5 years without maintenance. In harsh environments and safety-critical applications, more frequent maintenance intervals and a proper fluid monitoring program should be considered to ensure reliable Product performance.
With regular maintenance and monitoring of the fluid, the service life for this actuator will extend well beyond 5 years.
Lubrication
For normal duty, the actuator is self-lubricated for the life of the Product.
The hydraulic fluid should be filtered and monitored for cleanliness to a contamination threshold of 20/18/15 per ISO 4406 (NAS 9). Lower contamination thresholds are recommended to maximize service life.
Lifting Point Load Ratings
Use lifting straps or chains rated for a minimum of 2000 lbs.
Pressure Connections
Per assembly drawing:
Hydraulic and Pneumatic connections will be located on the outside and inside end caps of the power module. The size of the connection will vary based on the Scotch Yoke Model size and can be viewed in data sheet DS1001 Scotch Yoke M-Series Dimensional Data.
Torque Ratings for each SYM model.
| Model |
Torque Capacity (in*lbf) |
| SYM1 |
80,000 |
| SYM2 |
190,000 |
| SYM3 |
375,000 |
| SYM4 |
750,000 |
| SYM5 |
1,250,000 |
Torque Rating is based on a springless Double-Acting actuator. For specific spring return torque capacities please refer to DS1002 SYM Torque Table Data or consult with an ATI Representative.
Warranty
Complete warranty terms and conditions are included in the product manual.
ATI Scotch Yoke Systems, if handled, installed, used, and maintained according to this manual, are guaranteed to be without defects in material and workmanship. The warranty period is two (2) years after the date of factory shipment. Refer to the Product nameplate for the serial number to confirm the date of shipment. The warranty does not cover accessory components installed by others or materials that are installed inappropriately, used inappropriately, or modified or repaired without approval by ATI.
NON-WARRANTY CLAUSE: Contents of this publication are periodically checked for compliance with the associated Products, and corrections are made as necessary for subsequent publications. ATI also modifies the Product in this publication (within the limits of Optional Certifications) to meet special requirements for specific customer orders. Therefore, ATI cannot exclude the possibility of discrepancies between this publication and the Product and special documentation that is prepared for a particular shipment, and ATI does not accept liability for discrepancies between information in this publication and the Product.
