Emerson ET124 Series Instruction Manual Download Page 8

VCIMD-16109 © 2021 Emerson Electric Co. All rights reserved. 11/21  

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Emerson Electric Co. does not assume responsibility for the selection, use 

or maintenance of any product. Responsibility for proper selection, use 

and maintenance of any Emerson Electric Co. product remains solely with 

the purchaser.

Parts Ordering

When corresponding with your local Sales Office 

about this equipment, always reference the equipment 

regulator size, service and serial number.
When ordering replacement parts, reference the key 

number of each needed part as found in the following 

parts list and indicate the part number. 

Parts List

Type E Main Valve

See Instruction Manual VCIMD-14961-EN

Type E2 Main Valve

See Instruction Manual VCIMD-14935-EN

T124 and T134 Series Pilot

See Instruction Manual VCIMD-14980-EN

ET124 and ET134 Series 

Emerson Automation Solutions

Americas 

McKinney, Texas 75070 USA 

T   +1 800 558 5853 

+1 972 548 3574

Europe 

Bologna 40013, Italy 

T  +39 051 419 0611

Asia Pacific

 

Singapore 128461, Singapore 

T  +65 6777 8211

Middle East and Africa 

Dubai, United Arab Emirates 

T  +971 4 811 8100

SpenceValve.com

SIOI85B

Summary of Contents for ET124 Series

Page 1: ...jury Only a qualified person shall install or service the ET124 and ET134 Series regulators Introduction Scope of the Manual This manual provides instructions for the installation troubleshooting maintenance valve setting and parts ordering for ET124 and ET134 Series regulators Refer to the following documents for the complete details VCIMD 14980 for Types T124 and T134 temperature and pressure pi...

Page 2: ...r Cast Iron 250 psi 17 2 bar 1 The pressure temperature limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded Principle of Operation The regulator is operated by its initial steam pressure The main valve is normally closed being held so by initial pressure on the disk and by an internal main spring The pilot is opened by compressing the pressure li...

Page 3: ...ipe to the underside of the pilot diaphragm As the pressure on this diaphragm approaches a balance with the thrust of the pressure limit spring the pilot throttles This in turn allows the main valve to assume a position where just enough steam flows to maintain the set maximum delivery pressure As the temperature of the heated medium rises vapor pressure is generated in the thermostat bulb and tra...

Page 4: ...g wheel until 1 2 in 12 7 mm of thread is exposed Back off pressure adjusting screw to remove all compression from pressure limit spring See Figure 3 Planning the Installation 1 Locate the regulator in a horizontal pipe 2 Prevent water hammer and erratic operation by providing a trap ahead of the regulator 3 Avoid damaging the effects of scale and dirt in pipe lines by using a strainer to protect ...

Page 5: ...ulator from the pressure system and release all pressure from the pilot and main valve before performing maintenance operations 2 Crack open outlet stop valve Crack open inlet stop valve blow down strainer then slowly open inlet valve wide open 3 Turn up pressure adjustment slowly When steam begins to flow open outlet stop valve gradually 4 Continue delivery pressure adjustment until heater output...

Page 6: ...8 Leak in the thermostat bulb may allow heated fluid pressure if sufficiently high to back up into thermal system to hold the pilot closed Complete dismantling at regular intervals for inspection and repair is not recommended Under normal conditions if kept relatively free of dirt a regulator will function year after year with minimum maintenance attention These service points are suggested 1 Afte...

Page 7: ...that called for by the medium flowing through the heater a Arrange to drain condensate by gravity or lift it with a pump 4 Sticky check valve in return line Dismantling Main Valve 1 Remove the pilot and its connection to the main valve 2 Remove the top flange of the valve 3 Connect a source of air water steam pressure which can be adjusted by hand to the underside of the diaphragm as shown in Figu...

Page 8: ...n Electric Co does not assume responsibility for the selection use or maintenance of any product Responsibility for proper selection use and maintenance of any Emerson Electric Co product remains solely with the purchaser Parts Ordering When corresponding with your local Sales Office about this equipment always reference the equipment regulator size service and serial number When ordering replacem...

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