Emerson F-Series User manual

Bettis RGS F-Series Spring-Return Actuators

Installation, Operation and Maintenance Manual

RGS011110-3 Rev. 0

November 2015

Installation, Operation and Maintenance Manual

RGS011110-3 Rev. 0

Table of Contents

November 2015

Table of Contents

Section 1: Overview ��1

Section 2: Installation ��2

2.1 Valve Attachment ........................................................................................ 3

2.2 Accessory Mounting .................................................................................... 3

2.3 Piping and Operation................................................................................... 4

2.4 Travel Adjustment........................................................................................ 7

Section 3: General Troubleshooting ��9

Section 4: Maintenance��10

4.1 Periodic Maintenance Schedule ................................................................. 10

4.2 Lubrication................................................................................................. 10

4.3 Maintenance Kit..........................................................................................12

4.4 Piston Seal Replacement.............................................................................12

4.5 Yoke Seal and Bushing Replacement.......................................................... 16

4.6 Pins and Rollers Replacement .................................................................... 20

Appendix A: ��22

A.1 Force Module ............................................................................................ 22

A.2 Torque Module .......................................................................................... 24

November 2015

Installation, Operation and Maintenance Manual

RGS011110-3 Rev. 0

Section 1: Overview

Overview

Section 1: Overview

NOTE:

All activities must be carried out in order to ensure proper actuator operation. Always

read all instructions before beginning maintenance.

Bettis RGS F-Series actuators are composed of three basic sub-assemblies, two force

modules and a torque module. The force modules contain the pistons which provide

linear motion. The torque module contains the yoke which converts the force modules’

linear motion into torque and operates the valve.

Every actuator assembled by Bettis is tested prior to shipment to our customers.

Order specific documentation may be available upon request.

Installation, Operation and Maintenance Manual

RGS011110-3 Rev. 0

November 2015

Section 2: Installation

Installation

Section 2: Installation

Bettis actuators may be mounted in any position/orientation. If necessary, lift the actuator

with straps placed inside the framework of the body. Never lift the actuator by the cylinders,

tie rods, or travel stops. Lifting the actuator with the valve attached is not generally

recommended.

Figure 1

November 2015

Installation, Operation and Maintenance Manual

RGS011110-3 Rev. 0

Section 2: Installation

Installation

Larger sizes have lifting eyes incorporated into their body section which may be used to

lift the actuator.

Figure 2

2�1 Valve Attachment

NOTE:

Prior to mounting the actuator, verify alignment of coupler and shaft to ensure that the

valve will move to correct position.

Ensure the actuator is in the same position as the valve. It may be necessary to stroke the

actuator to determine the correct mounting orientation. Attach the actuator to the valve

using the proper bracket and coupler, or with a Bettis Universal Mounting Plate (UMP) if

provided. Using all mounting holes indicated on Bettis dimensional drawings, tighten all

fasteners hand tight then torque the fasteners to the corresponding value on the table

below.

Table 1�

Thread Pattern Ft-Lbs Nm

Accessories M5 3.4 4.6

F2200 M12 49 66

F2250/2300 M16 120 162

F2375 M20 235 318

F2488 M24 400 543

F2575 M30 800 1084

2�2 Accessory Mounting

As a standard, Bettis RGS F-Series actuators are provided with female 4mm slotted

accessory mounting geometry. When installing accessories, such as switch boxes or

positioners, tighten accessory mounting bolts hand tight, stroke the actuator three

times to ensure proper alignment then tighten the accessory mounting bolts to the

proper torque. Check the dimensional drawing or associated product bulletin for exact

dimensions.

Installation, Operation and Maintenance Manual

RGS011110-3 Rev. 0

November 2015

Section 2: Installation

Installation

2�3 Piping and Operation

The operation of a Bettis RGS F-Series Spring-Return (SR) actuator is comparable to any

spring-return scotch yoke actuator.

Instrument air, water, and other power gases and fluids may be used to cycle the actuator so

long as construction materials were chosen accordingly and maximum allowable pressure is

not exceeded. Air driven stainless-steel actuators with stainless-steel or composite cylinders

are not harmed by wet air (so long as freezing does not occur). Aluminum and chrome-

plated steel cylinders may be harmed over time by the presence of water.

WARNING: DO NOT EXCEED PRESSURE RATING

Exceeding the stated maximum pressure may result in damage to equipment and danger

to personnel including severe injury or death. Consult the actuator label for operating

limits. If an actuator label is missing, contact Bettis to request a replacement.

WARNING: DO NOT EXCEED TEMPERATURE RATING

Operating outside of the minimum and maximum temperature range may result in damage

to equipment and danger to personnel including severe injury or death. Consult the

actuator label for operating limits. If an actuator label is missing, contact Bettis to request a

replacement. An example of an actuator label is provided below for your reference.

NOTE:

CE marking indicates product conforms to the requirements of applicable directives as

listed on the actuator label.

November 2015

Installation, Operation and Maintenance Manual

RGS011110-3 Rev. 0

Section 2: Installation

Installation

All Bettis actuators are shipped in the fail clockwise (Left-Hand) orientation unless

ordered as fail counter-clockwise (Right-Hand). The orientation may be reversed in the

field by moving all accessories to the opposite side of the shaft and turning the actuator

top–side down.

Spring-Return (Left-Hand): pressure on the end cap ports pushes the pistons inward

and causes counterclockwise rotation. Springs push the pistons outward resulting in a

clockwise rotation.

Spring-Return (Right-Hand): pressure on the end cap ports pushes the pistons

inward and causes clockwise rotation. Springs push the pistons outward resulting in a

counterclockwise rotation.

Figure 3

Fail Clockwise

Fail Counter Clockwise

Installation, Operation and Maintenance Manual

RGS011110-3 Rev. 0

November 2015

Section 2: Installation

Installation

Piping Guidelines:

• Both end cap pressure ports (P1 and P2) must be utilized for proper operation.

• P1 and P2 are typically connected and powered by a single air pathway.

• P5 is a breather port that should be fitted with a filter or strainer.

Figure 4

P5 (2)

November 2015

Installation, Operation and Maintenance Manual

RGS011110-3 Rev. 0

Section 2: Installation

Installation

2�4 Travel Adjustment

The following instructions are for fail clockwise (Left-Hand) orientated actuators.

For non-standard models, clockwise and counterclockwise motion will be the inverse of

what is described below. Check the actuator model and orientation before adjusting the

Travel Stops.

Figure 5

Travel Stop

A-1

Travel Stops

B-1

(x2)

Travel Stops

B-2

(x2)

Travel Stop

A-2

Set Clockwise Rotation (Travel Stops A)

1. Relieve all pressure from the actuator.

2. Loosen the Travel Stop nuts on Travel Stops A-1 and A-2. Be careful not to

misplace the travel stop O-rings.

3. Ensure actuator lockout (if provided) is disengaged.

4. Apply pressure to P1 and P2 to force the pistons fully inward, and away from the

end cap travel stops.

5. Unthread Travel Stop A-2 four to five full turns.*

6. Adjust Travel Stop A-1 until travel is set to the desired position. It will be

necessary to relieve pressure from P1 and P2 between adjustments to

determine final position of travel.

7. Relieve pressure to P1 and P2 and thread Travel Stop A-2 in until it is in firm

contact with the piston.

8. With pressure relieved, tighten both travel stop nuts on Travel Stops A until they

are in contact with the end cap, then tighten an additional 1/4 turn.

*Clockwise rotation of the travel stops will shorten actuator stroke, counter

clockwise rotation will lengthen actuator stroke�

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