DRS

Pneumatic Scotch Yoke Actuator

617,333 Nm Max Torque · 1,000,000 Cycles Seal Life · 98% Torque to Stem · 21 O-Rings, Zero Gaskets · −60 to +125 °C

Industries served

Process Industries,Oil and Gas ,Power,Metal & Mining,Water Management,Paper & Pulp,Cement,Chemicals

Certificates

CEPEDSIL3ATEX

Yoke on ball bearings — not on a sliding surface — Lifetime-lubricated ball bearings with a hardened pin on hardened rollers hold the yoke in alignment through the whole stroke, so the mechanism cannot bind under load, side thrust or thermal movement.
98% of the torque reaches the valve stem — not the friction inside — Air pressure goes into turning the valve, so you size on real output rather than a friction margin, and break torque at year ten still looks like break torque at commissioning.
The piston is guided on its own bush — it never rides on the rod — Phosphor bronze guide bushing on the piston, a separate heavy duty bronze bearing and V-seal carrying the rod: no metal-to-metal contact anywhere in the cylinder.
One million cycles — guaranteed, not estimated — X-profile seals flex to seal, hold grease in their own geometry and run at low friction against a mirror-finished, burnished piston rod.
The spring is held in its own module — not compressed into the end covers — No cover fastener carries stored energy and no careless strip-down releases it. Springs are non-buckling, lifetime lubricated and epoxy coated.
Genuinely modular — reconfigure in the field, not at the factory — Convert double acting to spring return, or fail close to fail open, by swapping modules without disassembling the frame or removing covers. Fewer part numbers held as critical spares.
The piston rod runs on a solid bearing — aligned by design — Better alignment and smooth operation through the full stroke.
Tie rods inside the cylinder — no external corrosion path — Enclosed tie rods for the highest corrosion protection and the best performance, with extreme-duty travel stops and external stroke adjustment.
21 O-rings, zero gaskets — reseal on the same seal — Open a cover for inspection and close it again on what was already there: no scraping off a bonded gasket, no waiting on a gasket set, no leak path from a hurried re-make in the field.
Rod-seal leakage is detected — not discovered — The vent valve has a built-in non-return function for IP67, and a secondary vent picks up leakage in the rod seal area before it becomes a failure.
Everything above the valve — one supplier, one test report — Rotex builds, tubes and tests the complete assembly in-house: positioners, solenoid valves, NAMUR limit switches, air relays and filter regulators, volume boosters, junction boxes, safety air tanks, quick exhaust valves, hydraulic and mechanical overrides, and PST packages with software and diagnostics — with stroke time calculation and Factory Acceptance Testing.

TypePneumatic scotch yoke type quarter turn actuator

DesignSpring return or double acting

Supply mediumAir, natural gas (sweet), nitrogen

Torque range25 Nm - 218765 Nm @ 4 bar, max up to 700000 Nm

Temperature ranges:-60...+125 °C

Protection classIP66M/IP67M (IEC 60529)

MountingISO 5211, VDI/VDE 3845

BrochuresDRS Product Catalogue

Download

CertificationsDRS_ATEX Certificate

Download

CertificationsDRS_PED Certificate

Download

CertificationsDRS_SIL 3 Certficate

Download

CertificationsDRS_TR-CU Certificate

Download

Yoke on ball bearings — not on a sliding surface — Lifetime-lubricated ball bearings with a hardened pin on hardened rollers hold the yoke in alignment through the whole stroke, so the mechanism cannot bind under load, side thrust or thermal movement.
98% of the torque reaches the valve stem — not the friction inside — Air pressure goes into turning the valve, so you size on real output rather than a friction margin, and break torque at year ten still looks like break torque at commissioning.
The piston is guided on its own bush — it never rides on the rod — Phosphor bronze guide bushing on the piston, a separate heavy duty bronze bearing and V-seal carrying the rod: no metal-to-metal contact anywhere in the cylinder.
One million cycles — guaranteed, not estimated — X-profile seals flex to seal, hold grease in their own geometry and run at low friction against a mirror-finished, burnished piston rod.
The spring is held in its own module — not compressed into the end covers — No cover fastener carries stored energy and no careless strip-down releases it. Springs are non-buckling, lifetime lubricated and epoxy coated.
Genuinely modular — reconfigure in the field, not at the factory — Convert double acting to spring return, or fail close to fail open, by swapping modules without disassembling the frame or removing covers. Fewer part numbers held as critical spares.
The piston rod runs on a solid bearing — aligned by design — Better alignment and smooth operation through the full stroke.
Tie rods inside the cylinder — no external corrosion path — Enclosed tie rods for the highest corrosion protection and the best performance, with extreme-duty travel stops and external stroke adjustment.
21 O-rings, zero gaskets — reseal on the same seal — Open a cover for inspection and close it again on what was already there: no scraping off a bonded gasket, no waiting on a gasket set, no leak path from a hurried re-make in the field.
Rod-seal leakage is detected — not discovered — The vent valve has a built-in non-return function for IP67, and a secondary vent picks up leakage in the rod seal area before it becomes a failure.
Everything above the valve — one supplier, one test report — Rotex builds, tubes and tests the complete assembly in-house: positioners, solenoid valves, NAMUR limit switches, air relays and filter regulators, volume boosters, junction boxes, safety air tanks, quick exhaust valves, hydraulic and mechanical overrides, and PST packages with software and diagnostics — with stroke time calculation and Factory Acceptance Testing.

Request a Quote

Submit your application details to receive accurate pricing, lead time, and configuration options

DRS

Pneumatic Scotch Yoke Actuator

617,333 Nm Max Torque · 1,000,000 Cycles Seal Life · 98% Torque to Stem · 21 O-Rings, Zero Gaskets · −60 to +125 °C

Industries served

Process Industries,Oil and Gas ,Power,Metal & Mining,Water Management,Paper & Pulp,Cement,Chemicals

Certificates

CEPEDSIL3ATEX

Yoke on ball bearings — not on a sliding surface — Lifetime-lubricated ball bearings with a hardened pin on hardened rollers hold the yoke in alignment through the whole stroke, so the mechanism cannot bind under load, side thrust or thermal movement.
98% of the torque reaches the valve stem — not the friction inside — Air pressure goes into turning the valve, so you size on real output rather than a friction margin, and break torque at year ten still looks like break torque at commissioning.
The piston is guided on its own bush — it never rides on the rod — Phosphor bronze guide bushing on the piston, a separate heavy duty bronze bearing and V-seal carrying the rod: no metal-to-metal contact anywhere in the cylinder.
One million cycles — guaranteed, not estimated — X-profile seals flex to seal, hold grease in their own geometry and run at low friction against a mirror-finished, burnished piston rod.
The spring is held in its own module — not compressed into the end covers — No cover fastener carries stored energy and no careless strip-down releases it. Springs are non-buckling, lifetime lubricated and epoxy coated.
Genuinely modular — reconfigure in the field, not at the factory — Convert double acting to spring return, or fail close to fail open, by swapping modules without disassembling the frame or removing covers. Fewer part numbers held as critical spares.
The piston rod runs on a solid bearing — aligned by design — Better alignment and smooth operation through the full stroke.
Tie rods inside the cylinder — no external corrosion path — Enclosed tie rods for the highest corrosion protection and the best performance, with extreme-duty travel stops and external stroke adjustment.
21 O-rings, zero gaskets — reseal on the same seal — Open a cover for inspection and close it again on what was already there: no scraping off a bonded gasket, no waiting on a gasket set, no leak path from a hurried re-make in the field.
Rod-seal leakage is detected — not discovered — The vent valve has a built-in non-return function for IP67, and a secondary vent picks up leakage in the rod seal area before it becomes a failure.
Everything above the valve — one supplier, one test report — Rotex builds, tubes and tests the complete assembly in-house: positioners, solenoid valves, NAMUR limit switches, air relays and filter regulators, volume boosters, junction boxes, safety air tanks, quick exhaust valves, hydraulic and mechanical overrides, and PST packages with software and diagnostics — with stroke time calculation and Factory Acceptance Testing.

TypePneumatic scotch yoke type quarter turn actuator

DesignSpring return or double acting

Supply mediumAir, natural gas (sweet), nitrogen

Torque range25 Nm - 218765 Nm @ 4 bar, max up to 700000 Nm

Temperature ranges:-60...+125 °C

Protection classIP66M/IP67M (IEC 60529)

MountingISO 5211, VDI/VDE 3845

BrochuresDRS Product Catalogue

Download

CertificationsDRS_ATEX Certificate

Download

CertificationsDRS_PED Certificate

Download

CertificationsDRS_SIL 3 Certficate

Download

CertificationsDRS_TR-CU Certificate

Download

Yoke on ball bearings — not on a sliding surface — Lifetime-lubricated ball bearings with a hardened pin on hardened rollers hold the yoke in alignment through the whole stroke, so the mechanism cannot bind under load, side thrust or thermal movement.
98% of the torque reaches the valve stem — not the friction inside — Air pressure goes into turning the valve, so you size on real output rather than a friction margin, and break torque at year ten still looks like break torque at commissioning.
The piston is guided on its own bush — it never rides on the rod — Phosphor bronze guide bushing on the piston, a separate heavy duty bronze bearing and V-seal carrying the rod: no metal-to-metal contact anywhere in the cylinder.
One million cycles — guaranteed, not estimated — X-profile seals flex to seal, hold grease in their own geometry and run at low friction against a mirror-finished, burnished piston rod.
The spring is held in its own module — not compressed into the end covers — No cover fastener carries stored energy and no careless strip-down releases it. Springs are non-buckling, lifetime lubricated and epoxy coated.
Genuinely modular — reconfigure in the field, not at the factory — Convert double acting to spring return, or fail close to fail open, by swapping modules without disassembling the frame or removing covers. Fewer part numbers held as critical spares.
The piston rod runs on a solid bearing — aligned by design — Better alignment and smooth operation through the full stroke.
Tie rods inside the cylinder — no external corrosion path — Enclosed tie rods for the highest corrosion protection and the best performance, with extreme-duty travel stops and external stroke adjustment.
21 O-rings, zero gaskets — reseal on the same seal — Open a cover for inspection and close it again on what was already there: no scraping off a bonded gasket, no waiting on a gasket set, no leak path from a hurried re-make in the field.
Rod-seal leakage is detected — not discovered — The vent valve has a built-in non-return function for IP67, and a secondary vent picks up leakage in the rod seal area before it becomes a failure.
Everything above the valve — one supplier, one test report — Rotex builds, tubes and tests the complete assembly in-house: positioners, solenoid valves, NAMUR limit switches, air relays and filter regulators, volume boosters, junction boxes, safety air tanks, quick exhaust valves, hydraulic and mechanical overrides, and PST packages with software and diagnostics — with stroke time calculation and Factory Acceptance Testing.

Request a Quote

Submit your application details to receive accurate pricing, lead time, and configuration options