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Scotch yoke part-turn actuators for the largest valves, hydraulic (HRSDA / HRSSA) or electro-hydraulic (EHRSDA / EHRSSA), at up to 200 bar. Double acting from 208 to 112,595 Nm across 20 sizes, and spring return models that close the valve on loss of pressure or power. Symmetric or canted yoke, IP66M / IP67M.
208 – 112,595 Nm
Up to 200 bar
HRSDA · HRSSA
IP66M / IP67M
208 – 112,595 Nm (tables at 100, 130 and 160 bar)
Spring torque from 147 Nm, several spring options per size
Hydraulic up to 200 bar (2,900 psi)
IEC IP66M / IP67M, O-ring sealed
Fully enclosed centre body, ductile iron or stainless steel by size
Symmetric or canted design
Carbon steel, honed and hot chrome plated; chrome plated rods
High-grade bronze or ceramic; bronze sliding blocks
Adjustable -5° to +95°
ISO 5211 direct mounting; NAMUR for accessories
C4 to ISO 12944 (option C5-M)
Stay put, fail last, fail open or fail close (spring or accumulator)
Torque in Nm, open / close. Hydraulic HRSDA or electro-hydraulic EHRSDA.
| Model | 100 bar | 130 bar | 160 bar |
|---|---|---|---|
| HRSDA-A1-032 | 208 / 341 | 270 / 443 | 332 / 546 |
| HRSDA-A1-040 | 372 / 533 | 483 / 693 | 595 / 853 |
| HRSDA-A1-050 | 624 / 833 | 812 / 1,082 | 999 / 1,332 |
| HRSDA-01-040 | 694 / 925 | 902 / 1,202 | 1,110 / 1,480 |
| HRSDA-01-050 | 1,084 / 1,445 | 1,409 / 1,879 | 1,734 / 2,312 |
| HRSDA-02-050 | 1,416 / 1,888 | 1,841 / 2,455 | 2,266 / 3,021 |
| HRSDA-02-060 | 2,072 / 2,998 | 2,694 / 3,897 | 3,316 / 4,796 |
| HRSDA-02-080 | 3,625 / 4,834 | 4,713 / 6,824 | 5,800 / 7,734 |
| HRSDA-02-100 | 5,268 / 7,552 | 6,848 / 9,818 | 8,428 / 12,084 |
| HRSDA-03-060 | 2,438 / 3,526 | 3,169 / 4,584 | 3,901 / 5,642 |
| HRSDA-03-080 | 4,265 / 5,686 | 5,544 / 7,392 | 6,823 / 9,098 |
| HRSDA-03-100 | 6,197 / 8,884 | 8,056 / 11,550 | 9,915 / 14,215 |
| HRSDA-04-100 | 8,055 / 11,548 | 10,472 / 15,013 | 12,888 / 18,478 |
| HRSDA-04-125 | 13,165 / 18,045 | 18,053 / 23,458 | 22,219 / 28,871 |
| HRSDA-04-140 | 16,976 / 22,635 | 22,069 / 29,426 | 27,162 / 36,216 |
| HRSDA-05-140 | 20,902 / 27,869 | 27,172 / 36,230 | 33,443 / 44,590 |
| HRSDA-05-160 | 27,300 / 36,400 | 35,490 / 47,320 | 43,680 / 58,240 |
| HRSDA-05-180 | 34,552 / 46,069 | 44,917 / 59,890 | 55,283 / 73,711 |
| HRSDA-06-180 | 42,751 / 57,001 | 55,576 / 74,101 | 68,401 / 91,202 |
| HRSDA-06-200 | 52,779 / 70,372 | 68,612 / 91,483 | 84,446 / 112,595 |
Each size comes with several spring options. Spring start torque range shown; see the full list for every spring and the oil-side torque at 100, 130 and 160 bar.
| Size | Spring Options | Spring Start Torque |
|---|---|---|
| HRSSA-A1-030 | 3 | 147 – 220 Nm |
| HRSSA-A1-040 | 3 | 256 – 401 Nm |
| HRSSA-A1-050 | 3 | 416 – 503 Nm |
| HRSSA-01-040 | 3 | 495 – 726 Nm |
| HRSSA-01-050 | 3 | 758 – 982 Nm |
| HRSSA-02-050 | 3 | 1,096 – 1,643 Nm |
| HRSSA-02-060 | 3 | 1,622 – 2,154 Nm |
| HRSSA-02-080 | 3 | 2,450 – 3,874 Nm |
| HRSSA-02-100 | 3 | 3,947 – 5,105 Nm |
| HRSSA-03-060 | 3 | 2,054 – 2,695 Nm |
| HRSSA-03-080 | 3 | 2,996 – 4,877 Nm |
| HRSSA-03-100 | 3 | 4,962 – 6,339 Nm |
| HRSSA-04-100 | 3 | 6,135 – 10,390 Nm |
| HRSSA-04-125 | 3 | 11,028 – 13,336 Nm |
| HRSSA-04-140 | 3 | 12,331 – 18,157 Nm |
| HRSSA-05-140 | 4 | 16,485 – 24,311 Nm |
| HRSSA-05-160 | 2 | 25,856 – 30,068 Nm |
| HRSSA-05-180 | 1 | 26,050 – 26,050 Nm |
Torque for the Largest Valves
Up to 112,595 Nm double acting at 160 bar, from a fully enclosed, weather-resistant centre body.
Symmetric or Canted Yoke
Choose the yoke to match the valve torque curve with minimum weight and cost.
Low Friction, No Chatter
Honed, hot chrome plated cylinders, bronze sliding blocks and a dynamic sailing piston seal, even after long idle periods.
Electro-Hydraulic Option
EHRSDA / EHRSSA versions with power pack, accumulator or hand pump; solar-charged power packs for remote sites.
Fail-Safe Choices
Stay put, fail last, fail open or fail close using spring or stored accumulator energy.
Modular & Low Maintenance
Modular double acting, tandem or spring return builds; replaceable bearings and L-plate yoke for long life.
112,595 Nm
Max Torque
200 bar
Max Pressure
20 Sizes
Double Acting
IP66M / IP67M
Protection
C4 / C5-M
ISO 12944 Painting
