K Range Actuator | Valve Actuators India

K Range

High Torque Electric Valve Actuators

Redefining Flow Control

Rotork is the global market leader in valve automation and flow control. Our products and services are helping organisations around the world to improve efficiency, assure safety and protect the environment.

We strive always for technical excellence, innovation and the highest quality standards in everything we do. As a result, our people and products remain at the forefront of flow control technology.

Uncompromising reliability is a feature of our entire product range, from our flagship electric actuator range through to our pneumatic, hydraulic and electro-hydraulic actuators, as well as instruments, gearboxes and valve accessories.

Rotork is committed to providing first class support to each client throughout the whole life of their plant, from initial site surveys to installation, maintenance, audits and repair. From our network of national and international offices, our engineers work around the clock to maintain our position of trust.

Rotork. Redefining flow control.

K Range Actuator

With the K Range high torque actuator, Rotork is now able to offer all the proven design advantages of its established ranges at higher torque values than have previously been possible. Available in three models, K4000, K5500 and K7000, these actuators offer torque ratings of up to 7000 Nm and thrust ratings of up to 1115 kN.

Standard K Range high torque features include:

• Double-sealing against the environment, protecting electrical integrity at all times

• Standard wiring diagrams for any valve type

• Thrust or non-thrust mounting flange dimensions to International (ISO) valve standards

• Advanced counter switch mechanism featuring combined torque position limit switches at each end of travel

• Integral starter and control circuit option (Rotork Syncropak)

• Three base options for each size of actuator

• Watertight enclosures

K Range High Torque Features

Syncroset

Syncroset actuators incorporate the motor and limit and torque switches only. This minimizes the electrical equipment at the valve location and is therefore particularly suitable for locations where access is difficult or where excessive vibration may be experienced. However the reversing starter must be separately specified, purchased, installed and tested by the customer and the valve control system is therefore incomplete until wired in the field.

Features

1. Low ratio worm / wormwheel gear combined with final spur reduction gear offering a combined drive efficiency above that of conventional worm reduction designs. The gearcase is oil filled for normal operation in a temperature range of -30 to +70 oC.

2. Separate thrust bases providing increased stem acceptance and thrust if required. Base and flange dimensions to ISO standards.

3. Very advanced all metal counter switch mechanism featuring combined torque and position switch with torque switch latch which prevents valve hammering throughout travel with non-self-locking gears. Switch mechanism is quickly and easily set using only a conventional screwdriver. As with other Rotork designs, the reaction force on the wormshaft, in direct proportion to the output torque is used to trip the 'Open' and 'Close' adjustable torque switches.

4. Built-in squirrel cage motor with winding thermostat, specially designed for valve operation and combining low inertia with high torque. Class F insulation as standard.

5. Hammerblow backlash feature permitting motor to gain full speed before unsticking tight stem nuts, etc.

6. Hand/auto selector lever insures positive engagement of handwheel drive. Power drive automatically restored by motor start unless lever padlocked to prevent it. Generously proportioned wormdrive handwheel provided as standard operating through hammerblow mechanism. The side handwheel ratio is 90:1 giving a mechanical advantage of 33:1.

7. High output speeds at high torque enable large valves to be operated quickly and permit favorable top mounted actuator configuration.

Syncropak or Syncroset?

Any motorised valve requires a reversing contactor starter to switch the three phase motor in response to control signals. This may be separately installed or incorporated in the actuator. Rotork Syncroset actuators require separate starter facilities. Rotork Syncropak actuators contain their own starter and control equipment in a factory sealed and tested package.

Syncropak

Rotork Syncropak actuators incorporate the starter and local controls with considerable economy in site wiring as shown. This arrangement also enables the essential elements of the valve control system to be factory wired and tested and sealed by Rotork Quality Control. Because Syncropak incorporates everything required for operation from a three phase supply, it can be tested on local control by the valvemaker and site contractor with undivided contractual responsibility by Rotork for reliable operation. Syncropak options increase economy and add system reliability by providing a high degree of fault monitoring. Interposing relays enable light current cable to be used for distant remote control and indication. See publication RCIE - 34 for details.

Note: 'K' Range high torque actuators are manufactured with the same wiring diagram options as the Rotork 'K' Range product. In addition, the 'K' Range high torque counter switch mechanism can accept both extra end position and mid position switches.

Enclosure Options

Enclosure options

All 'K' Range high torque actuators are o-ring sealed from the environment and the exclusive Rotork 'double-sealed' feature means that the terminal compartment is separately sealed from the rest of the enclosure to insure that the actuator is permanently protected even during long periods of on-site wiring when the terminal cover is removed.

`O' ring

`O' ring

Drive Options

Drive Options

Three basic output drive column assemblies are available as standard on all sizes of ‘K’ Range high torque actuators.

Dimensions shown below are to International (ISO) dimensions.

F35E

The F35E is the basic torque only form. The center column is terminated with a Type 'E' bore diameter and keyway suitable for attachment to valve makers' gearbox, etc.

F40A

The F40A is a larger version of the F35AL separate base which provides enlarged stem acceptance and maximum thrust rating.

The F35AL is a separate thrust base which is added to the standard gearcase and which contains its own sealed thrust bearing and aluminum bronze drive bush. This feature maintains the maximum rising stem acceptance available through the actuator center column which in this form is simply fitted with a pair of male dogs which engage with the drive bush.

* Note: Optional Flange Type 3 & Type 4 with the following dimensions can be offered

Type 3 : 8 x M24 x 216 spigot dia x 356 PCD x 415 OD

Type 4 : 8 x M30 x 230 spigot dia x 406 PCD x 476 OD

K Range Performance Summary

Performance Data

Stall torque is 1.2-1.6 of rated torque. Limit switch turns range for all sizes is 5-1250 output turns.

Note: For other power supply options refer to Rotork.

Redefining Flow Control

Actuator Motors

Motors:

Rotork actuator motors are 3-phase, minimum class 'F' insulated, and high torque low inertia motors of 15 minutes rating. The motors are spigot mounted and o-ring sealed to provide complete environmental protection during long periods of inactivity when condensation build up can otherwise cause deterioration. Valves have a limited travel and impose a varying load throughout the stroke and consequently the valve actuator motor cannot run continuously and conventional "FULL LOAD" ratings are not relevant.

Hence our motors are short time rated, as the high inertia of continuously rated motors will inevitably damage the valves which are basically for "STOP DEAD" applications.

Motor is integral with actuator and hence as standard protected IP68 – IS/IEC-60529 enclosure.

The following performance characteristics are standard for our motors:

1) A high stalling torque in comparison with that required to operate and seat valve will be available at high speed for unseating in with a lost motion hammer blow effect which is achieved by allowing the motor to reach full speed before the drive is taken up.

2) A relatively high starting torque to enable the valve to be inched.

Number of starts

60 starts / hour.

Protection

Thermostat embedded in stator winding.

Bearing

Deep groove sealed ball bearing lubricated for life available.

Fan Cooling

The design of Rotork motors are such that it renders fan cooling unnecessary to achieve the 15 min rating.

Wiring Diagram

MOTOR THERMOSTAT

Redefining Flow Control

Dimensional Drawings

Bases: Note that F35E bases are integral within the above dimensions. F35AL and F40A are external bases which bolt to Face A.

Dimensional Drawings

Bases: Note that F35E bases are integral within the above dimensions. F35AL and F40A are external bases which bolt to Face A.