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Quarter turn rack & pinion design

RKPD



Double acting type

An heavy duty quarter-turn oil hydraulic actuator, rack and pinion design, double acting execution.

  • Double Acting (Fail Set) type for butterfly and ball valves
  • Quarter turn design with Rack & Pinion concept
  • Parity area both in open and close directions for balanced torques
  • Internal devices for oil pollution prevention
  • Mechanical end stop to restore the perfect sealing
  • Possible close regulation from -3° up to + 0° (from 87° up to 90°)
  • Direct assembling by means of ISO 5211 and DIN 3337 interfaces
  • Shaft and Pinion in one piece fully in AISI 316
  • Shaft extension in AISI 316 available over the feed back unit box also when is directly installed on the top of the actuator
  • Available to be used with mineral oil (viscosity from 15 up to 450 Cst according to the arctic or tropical area). Any specific oil have to be agreed with our technical department
  • 2 Quick connectors for portable or local hand pump
  • Emergency mechanical operation is always possible by wrench
Description Values
Design pressure 150 bar
Max working pressure 150 bar
Test pressure 225 bar
Calculated burst pressure (**) = 5 x max working pressure 750 bar
Max. working temperature (*) °C
Min. working temperature (*) °C
Rotation angle 90 °
Extra stroke + / - 5 °
Valve top mounting interface ISO 5211
Valve shaft connection DIN 3337
Actuators selection single rack Nr. 8 sizes
Torques selection single rack 230–500–930–1365–2160–2870–4360–5770 Nm
Actuators selection double rack Nr. 4 sized
Torques selection double rack 8730–11610–17570–22950 Nm
(*) Temperature range according to tropical or artic area for oil type, actuator materials selection and top mounting dimensioning
(**) Not standard, for some sizes available on request
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