Emerson Bettis RPX Series User manual

DOC.IOM.BRX.EN Rev. 2

May 2021

Installation, Operation and Maintenance Manual

Bettis RPX-Series

Rack and Pinion Pneumatic Actuators

Installation, Operation and Maintenance Manual

May 2021 DOC.IOM.BRX.EN Rev. 2

Notes

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Installation, Operation and Maintenance Manual

DOC.IOM.BRX.EN Rev. 2 May 2021

Table of Contents

Section 1: Introduction

1.1 General Pneumatic System Recommendations .............................................. 1

1.1.1 Operating Media ................................................................................. 2

Section 2: Construction

2.1 Construction ................................................................................................. 3

2.2 Storage ......................................................................................................... 3

Section 3: Standard Installation

3.1 Buttery Valve Application ............................................................................ 4

3.2 Ball Valve Application .................................................................................... 4

3.3 All Quarter Turn Valve Types .......................................................................... 5

3.4 Non-standard Installation - Double-Acting and Spring-Return Actuators ....... 6

Section 4: Disassembly Procedure

4.1 Double-Acting Actuators ............................................................................... 7

4.2 Single-Acting Actuators ................................................................................ 8

Section 5: Assembly Procedure

5.1 Assembly Double-Acting Actuators ............................................................... 9

5.2 Assembly Spring-Return .............................................................................. 11

5.2.1 FAIL - CLOSE - Clockwise to CLOSE ..................................................... 11

5.2.2 FAIL - OPEN - Counterclockwise to OPEN ........................................... 11

5.2.3 End Cap Bolt Torque Values .............................................................. 12

5.3 Spring Allocation ......................................................................................... 13

5.4 Setting of Internal Travel Stops .................................................................... 14

5.4.1 Double-Acting Actuator ................................................................... 14

5.4.2 Spring-Return Actuator FAIL - CLOSE ................................................. 15

5.4.3 Spring-Return Actuator FAIL - OPEN .................................................. 16

Section 6: Maintenance

6.1 Maintenance ............................................................................................... 17

6.2 Troubleshooting .......................................................................................... 17

6.3 Pneumatic Air Connection ........................................................................... 17

Section 7: Parts and Materials

Parts and Materials ................................................................................................ 18

Installation, Operation and Maintenance Manual

May 2021 DOC.IOM.BRX.EN Rev. 2

Notes

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Installation, Operation and Maintenance Manual

DOC.IOM.BRX.EN Rev. 2 May 2021

Section 1: Introduction

Introduction

Section 1: Introduction

This Section explains:

• General pneumatic system recommendations

1.1 General Pneumatic System Recommendations

All Bettis RPX Pneumatic Actuators are factory lubricated with Castrol LMM grease,

and unless the operating environment is extremely harsh, do not require relubrication.

For applications where the environmental temperature ranges from -40 °C to +65 °C

(-40 °F to +149 °F), a low temperature version is available with L-NBR O-ring seals and

Cassida Grease LTS 1 grease or Castrol Opti temp TT 1 + TT 1 EP.

For applications where the environmental temperature ranges from -52 °C to +65 °C

(-62 °F to +149 °F), an extreme low temperature version is available with L-NBR O-ring

seals and MolyKote®33 Extreme Low temperature grease.

For applications where the environmental temperature ranges from -15 °C to +150 °C

(+5 °F / +302 °F), a high temperature version is available with FKM O-ring seals and Castrol

Premium Heavy Duty grease.

To maintain maximum efciency with this actuator, we advise that the following basic

system recommendations are followed:

1. For maximum cycle life, the air quality of compressed air should be 2.4.1 as per

ISO 8573-1 standard.

2. Where pipelines are subjected to extremes of temperature, the system should

be tted with suitable air drying equipment.

3. When working at low temperatures, it is important that the compressed air has

been dried to a dew point of less than the ambient temperature. If this is not the

case, water will be condensed from the compressed air and freeze causing damage

to the seals inside the actuator, which could result in actuator failure.

4. Air control lines should be tted in accordance with a “Recommended Piping

Practice” and should not have loops, which may trap condensate.

5. All air connection pipe ends should be thoroughly cleaned and deburred after

cutting, to ensure that the pipeline is clear of debris.

6. If pipelines are hydraulically tested, then the lines should be “blown down” with

pressurized air to clear all traces of water, prior to connecting lines to the actuator.

7. Where pipe tting sealants are used, they should be applied to the male threads

only, to avoid excess compound being forced into the actuator control lines.

8. Where air lter equipment is used, the air lters should be situated in positions

that allow easy access to maintain and/or drain.

9. Where pneumatic valve positioners or pneumatic controllers are tted to the

valve actuator assemblies, oil mist lubricated air should not be used unless

the manufacturer states specically that the controllers are compatible with

lubricated air.

Installation, Operation and Maintenance Manual

May 2021 DOC.IOM.BRX.EN Rev. 2

Section 1: Introduction

Introduction

1.1.1 Operating Media

1. Use clean, dry or lubricated air or inert gas.

2. Maximum Operating Pressure (MOP) = 8.3 barg / 120 psig.

MOP is the pressure required to produce the maximum rated torque at the break

position for all actuators. Pressure should not exceed MOP during valve rotation.

MOP should be the maximum pressure regulator setting.

!WARNING

Do not exceed specications. It can be assured that the housing will not rupture or burst

when applying 10 bar / 145 psi of pressure but the cycle function cannot be guaranteed as

it totally depends on the time span to which actuator is subjected at 10 bar / 145 psi and

the frequency at which these pressure peaks occurs. Every time this peak occurs will, for

sure, have a signicantly negative effect on the life expectancy of the actuator.

!WARNING

For safety reasons, do not “air assist” Single-Acting Pneumatic Actuators.

Installation, Operation and Maintenance Manual

DOC.IOM.BRX.EN Rev. 2 May 2021

Section 2: Construction

Construction

Section 2: Construction

This Section explains:

• General construction principles and storage recommendations

2.1 Construction

Bettis RPX Actuators are designed to be mounted to quarter turn valves either directly

or using the correct mounting brackets/adapter and sizing products.

All models are of the opposed piston type. Each piston incorporates an integral rack

which engages with a one piece pinion drive shaft. The drive shaft is Zinc + Nickel plated

for maximum protection. The actuator body is of extruded aluminium, and tted with

“engineered polymer” bearings at the drive shaft locations. Bearing and piston seals are

dynamic “O-ring” type.

The drilling pattern and drive of the actuator valve ange complies to EN ISO 5211.

The drive is by means of a double square (star-drive) and most actuator size have 2 ISO

drilling patterns.

The top mounting interface and solenoid mounting interface complies to the

VDE/VDI 3845 (NAMUR) standard.

Adjustable travel stops are provided for each end of travel to ensure that the actuator

will open and close the valve precisely.

2.2 Storage

All actuators leave the factory tested and in excellent working condition and nish. In order

to maintain these characteristics until the actuator is installed in the plant, it is necessary

to observe the following rules and take appropriate measures during the storage period.

1. Make sure that the transport plugs remain tted in the air connections. These

plastic plugs close the air inlets, but do not have a waterproof function, as they

are a means of protection against the entry of foreign matter during transport.

For long term and specically outdoor storage, these plastic plugs need to be

replaced with plugs providing a complete weatherproof protection.

2. If the actuators are supplied separately from the valves, they must be placed onto a

wooden pallet in order to prevent damaging the valve coupling. For long term out-

door storage it is advised to coat the coupling parts with protective oil or grease.

3. In case of long term storage, it is advised to keep the actuators in a dry place or to

provide some means of weather protection.

Installation, Operation and Maintenance Manual

May 2021 DOC.IOM.BRX.EN Rev. 2

Standard Installation

Section 3: Standard Installation

This Section explains how to install the Bettis RPX actuators in most comon applications like:

• "In-line" installation on quarter turn valves.

• "Transverse" (a.k.a. across line) installation on quarter turn valves.

The RPX Actuator can be used for buttery valves, ball valves and all quarter turn devices,

in Double-Acting or Spring-Return conguration. Single-Acting Actuators are supplied

as FAIL - CLOSE (CW) as standard. Reverse acting (FAIL - OPEN; CCW) must be specied at

the time of order. Alternatively, it is possible to change an actuator from FAIL - CLOSE to

FAIL - OPEN by a trained and certied mechanical engineer using the assembly/disassembly

instructions as described in this document.

These installation instructions assume that the actuator is installed with the cylinder axis

parallel to the axis of the valve bore ("In-line" mounting). Please ensure that you have an

actuator with the correct drive, and that the valve and actuator are in the following positions:

1. Double-Acting units and Spring-Return units in FAIL - CLOSE position: valve closed,

actuator fully clockwise.

2. Double-Acting units and Spring-Return units in FAIL - OPEN position: valve open,

actuator fully counterclockwise.

3.1 ButteryValveApplication

Mounting to buttery valves:

1. Screw the actuator mounting studs tightly into the actuator base.

2. Install the correct shaft adapter if required.

3. Mount the actuator onto the valve top ange and secure using a lock washer

and nut on each mounting stud.

3.2 BallValveApplication

Mounting to ball and high performance buttery valves using a bracket:

1. Screw the actuator mounting studs tightly into the actuator base and secure

the mounting bracket to the underside of the actuator using four nuts and

washers as shown in Figure 1.

2. Install the appropriate coupling onto the valve stem. The coupling should

be lightly tapped or pressed onto the valve stem. The use of a lubricant

is recommended.

3. Mount the actuator and bracket onto the valve top ange using the

appropriate bolts.

Installation, Operation and Maintenance Manual

DOC.IOM.BRX.EN Rev. 2 May 2021

Standard Installation

Section 3: Standard Installation

3.3 AllQuarter-TurnValveTypes

1. Before installing the valve/actuator assembly in a piping system, the disc

travel should be veried and adjusted if necessary using the travel stop screws

(see Section 5.4, Setting of internal travel stops).

2. When installing the valve/actuator assembly into the pipeline, ensure that the

specic instructions relating to the valve installation are followed.

NOTE:

Some valves may require to be tted into the pipeline prior to mounting the actuator.

Rubber lined buttery valves are an example of this.

3. For valves which need to be installed in the pipeline prior to tting the actuator,

ensure that the valve is operated into its failsafe position before mounting the

actuator onto the valve.

Figure 1 Actuator Mounting

Typical Butterfly valve mounting Typical Ball valve mounting

Pneumatic

actuator

Stud

Lockwasher

Valve

Adaptor

(if required)

Nut

Pneumatic

actuator

Stud

Lockwasher

Nut

Lockwasher

Bracket

(if required)

Bolt

Coupling

(if required)

Nut

Ball valve

Pneumatic

actuator Pneumatic

actuator

Adaptor

(if required)

Bracket

(if required)

Coupling

(if required)

Bolt

Lockwasher

Nut

Stud

Valve Ball valve

TypicalButteryValveMounting TypicalBallValveMounting

Installation, Operation and Maintenance Manual

May 2021 DOC.IOM.BRX.EN Rev. 2

Section 3: Standard Installation

Standard Installation

3.4 Non-standard Installation - Double-Acting and

Spring-Return Actuators

In circumstances where the actuator is required to be installed in the transverse position

i.e. at right angles to the valve bore ("across line" mounting), the actuator must be rotated

through 90°. This is achieved in the following manner.

All quarter turn valve types:

1. Remove the actuator from the valve or the bracket by removing the 4 xing bolts/

nuts, and withdraw it vertically from the valve.

2. Reposition the shaft insert 90° for Double-D connections. Bored-keyed and star

drives do not require this action.

3. Rotate the actuator 90°.

4. Ret the actuator to the top of the valve or to the bracket. Pay attention to the

output drive of the actuator to be in line with the valve shaft and/or shaft insert.

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