Bettis Q-Series Switch Adjustment and Feedback Mechanism replacement Manuals & Guides

Repair Instruction Manual

DOC.SAFM.Q4.E Rev. 0

Q-Series

Switch Adjustment and Feedback Mechanism replacement

March 2018

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Repair Instruction Manual

DOC.SAFM.Q4.E Rev. 0

Table of Contents

March 2018

Contents

1 Before you start ....................................................................................................4

Scope ...................................................................................................................................................... 4

General safety messages ......................................................................................................................... 4

Required tools ......................................................................................................................................... 5

2 Disassembly procedure .........................................................................................6

3 Reassembly procedure ..........................................................................................9

4 Adjusting the switch points .................................................................................11

3Table of Contents

March 2018

Repair Instruction Manual

DOC.SAFM.Q4.E Rev. 0

1 Before you start

1.1 Scope

This repair manual is intended to give instructions to replace the switch adjustment screws and/or the
feedback mechanism of the Q-Seires Control modules.

1. Repair of the switch adjustment screws may be neccesary in case too much force was applied on the screw
heads and the screw heads were damaged as such.

2. Repair of the feedback mechanism may be neccesary in case too much force was applied on the threads of
the mechanism and threads were damaged as such.

Figure 1 Scope of the manual

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1.2 General safety messages

!

WARNING

Avoid personal injury or property damage from sudden release of process pressure or bursting of parts.
Before performing any maintenance procedures on the QC range of Control Modules:

- Always wear protective clothing, gloves, and eye wear when performing any maintenance procedures to
avoid personal injury or property damage.

- Do not remove the actuator from the valve while the valve is still pressurized.

- Disconnect any operating lines providing air pressure, electric power, or a control signal to the actuator.
Be sure the actuator cannot suddenly open or close the valve.

- Use bypass valves or completely shut off the process to isolate the control valve from process pressure.
Relieve process pressure from both sides of the valve.

- Use lock-out procedures to be sure that the above measures stay in effect while you work on the equipment.

- Check with your process or safety engineer for any additional measures that must be taken to protect
against process media.

- Vent the pneumatic actuator loading pressure and relieve any actuator spring pre-compression so the
actuator is not applying force to the valve stem; this will allow for the safe removal of the stem connector.

- Donotremoveorreplacewhilecircuitislivewhenaammableorcombustibleatmosphereispresent.

- Substitution of electronics cartridge, switch cartridge, pilot valve cartridge, pneumatic cartridge, enclosure
and seals must be with parts from Emerson else the suitability for Division 1 or 2 will be impaired. Always use
proper component replacement techniques, as presented in this manual. Improper techniques or component
selectionmayinvalidatetheapprovalsandtheproductspecications,asindicatedinapplicableControl
module Installation Guides and may also impair operations and the intended function of the device.

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