Spirax Sarco DP143 Installation And Maintenance Instructions Manual Download Page 4

IM-P006-07 

CTLS Issue 12

4

1.4 Hazardous liquids or gases in the pipeline

Consider what is in the pipeline or what may have been in the pipeline at some previous time. 

Consider: flammable materials, substances hazardous to health, extremes of temperature.

1.5 Hazardous environment around the product

Consider: explosion risk areas, lack of oxygen (e.g. tanks, pits), dangerous gases, extremes of 

temperature, hot surfaces, fire hazard (e.g. during welding), excessive noise, moving machinery.

1.6 The system

Consider the effect on the complete system of the work proposed. Will any proposed action (e.g. 

closing isolation valves, electrical isolation) put any other part of the system or any personnel 

at risk? 

Dangers might include isolation of vents or protective devices or the rendering ineffective of 

controls or alarms. Ensure isolation valves are turned on and off in a gradual way to avoid system 

shocks.

1.7 Pressure systems

Ensure that any pressure is isolated and safely vented to atmospheric pressure. Consider double 

isolation (double block and bleed) and the locking or labelling of closed valves. Do not assume 

that the system has depressurised even when the pressure gauge indicates zero.

1.8 Temperature

Allow time for temperature to normalise after isolation to avoid danger of burns.

1.9 Tools and consumables

Before starting work ensure that you have suitable tools and/or consumables available. Use only 

genuine Spirax Sarco replacement parts.

1.10 Protective clothing

Consider whether you and/or others in the vicinity require any protective clothing to protect against 

the hazards of, for example, chemicals, high/low temperature, radiation, noise, falling objects, and 

dangers to eyes and face.

1.11 Permits to work

All work must be carried out or be supervised by a suitably competent person.

Installation and operating personnel should be trained in the correct use of the product according 

to the Installation and Maintenance Instructions.

Where a formal 'permit to work' system is in force it must be complied with. Where there is no such 

system, it is recommended that a responsible person should know what work is going on and, 

where necessary, arrange to have an assistant whose primary responsibility is safety.

Post 'warning notices' if necessary.

Summary of Contents for DP143

Page 1: ...ation 3 Installation 4 Commissioning 5 Maintenance 6 Spare parts 7 Fault finding Copyright 2018 Printed in GB 0060026 12 DP143 DP143G DP143H and DP163 DP163G DP163Y Pilot Operated Pressure Reducing Va...

Page 2: ...IM P006 07 CTLS Issue 12 2...

Page 3: ...possible but if this is contemplated Spirax Sarco should be contacted to confirm the suitability of the product for the application being considered ii Check material suitability pressure and tempera...

Page 4: ...ouble block and bleed and the locking or labelling of closed valves Do not assume that the system has depressurised even when the pressure gauge indicates zero 1 8 Temperature Allow time for temperatu...

Page 5: ...ns 1 14 Freezing Provision must be made to protect products which are not self draining against frost damage in environments where they may be exposed to temperatures below freezing point 1 15 Disposa...

Page 6: ...ical Information Sheet 2 1 DP143 DP143G and DP143H 2 1 1 Description The DP143 DP143G and DP143H pilot operated pressure reducing valves have been manufactured using cast steel Available types DP143 S...

Page 7: ...nges Red 0 2 bar g to 17 bar g Grey 16 0 bar g to 24 bar g Body design conditions PN40 Maximum design pressure A D E 40 bar g 40 C A B C 17 3 bar g 40 C Maximum design temperature 350 C 24 bar g Minim...

Page 8: ...DP163G Is a soft seal version available for compressed air and inert industrial gases Note It is not recommended for oxygen service DP163Y Having a lower rate pressure control spring is suitable for s...

Page 9: ...6 0 bar g to 21 bar g Yellow 0 2 bar g to 3 0 bar g DP163Y only Body design conditions PN40 Maximum design pressure A D E 36 4 bar g 20 C A B C 18 9 bar g 20 C Maximum design temperature 250 C 24 bar...

Page 10: ...stallation observe the Safety information in Section 1 3 1 Supply Figure 1 The DP143 and DP163 pilot operated pressure reducing valves are supplied ready for fitting The pressure adjusted spring will...

Page 11: ...ply 3 2 Fitting Figure 2 and Figure 3 The valve should always be fitted in horizontal pipework with the main diaphragm chamber below the line To meet high capacities or widely varying loads or where s...

Page 12: ...sure sensing pipe supplied by others as follows Remove the balance pipe assembly The resulting BSP tapping in the side of the body should be blanked using the plug provided in the linen bag attached t...

Page 13: ...6 3 10 Bypass If it is essential to maintain a constant supply of steam across the valve It may be necessary to install a bypass to ensure continuation of supply when the reducing valve is being servi...

Page 14: ...control valves Line or system isolation valves A either remotely actuated or manual should be installed on the upstream side of the DP reducing valve Where there is downstream control equipment B par...

Page 15: ...slowly turn the adjustment screw in a clockwise direction until the desired downstream pressure reading is obtained 7 Holding the adjustment screw in position with the spanner tighten down the lock n...

Page 16: ...line The parts that may require replacing or refurbishing are listed below Main valve 17 and main valve seat 18 Pilot valve assembly 13 Pilot diaphragms 9 Main diaphragms 23 A detailed procedure for...

Page 17: ...IM P006 07 CTLS Issue 12 17 Fig 7 24 26 17 18 16 19 19A 29 10 3 12 6 1 2 5 8 7 9 31 11 21 15 13 23 30 25 32 28 4 14 20 22 27...

Page 18: ...late 5 5 Undo the 4 x M10 nuts 8 and remove the spring housing 4 bottom spring plate 7 and the diaphragms 9 6 Undo the pipework union nuts and release the 6 mm stainless steel pipework 7 Undo the nuts...

Page 19: ...age 20 16 Refit the 6 mm stainless steel pipework and retighten the union nuts to ensure a steam tight seal 17 Refit the two diaphragms 9 making sure that they are fitted the same way round as they we...

Page 20: ...mm A F spanner 6 Remove the screen 14 for cleaning taking care not to lose the small return spring 13D and ball 13C which can also be cleaned if necessary 7 Refit the ball spring and screen and refit...

Page 21: ...plate and pushrod assembly 25 26 30 4 Thoroughly clean off the lower diaphragm chamber and make sure that the contact surfaces are clean 5 Replace the main diaphragm plate and pushrod assembly and loo...

Page 22: ...se the main diaphragm plate and pushrod assemblyby following steps 2 and 3 in Section 5 8 11 Refit the pushrod assembly and replace the main valve head 17 making sure that it is located onto the main...

Page 23: ...interchangeability Valve size DN15LC DN15 DN20 DN25 DN32 DN40 DN50 DN80 Main diaphragm a a a b b c c d Pilot diaphragm a a a a a a a a Pilot valve seal assembly a a a a a a a a Pilot valve and plunger...

Page 24: ...ket of 3 O Set of spring housing securing studs and nuts set of 4 P Set of pilot valve housing securing studs and nuts set of 4 Q Set of diaphragm chamber securing bolts and nuts DN15 and DN20 set of...

Page 25: ...IM P006 07 CTLS Issue 12 25 T Fig 12 N M B C O D E P G F H Q J P Q V K R R A For interchangeability of spares see page 23...

Page 26: ...as Section 5 5 step 13 7 Valve capacity insufficient for downstream conditions a Check that the upstream pressure is correct If it is low the capacity of the valve will be reduced b Ensure that the ba...

Page 27: ...e valve If the downstream pressure drops excessively during full load condition it is likely that the valve is undersized in which case it should be replaced Once it has been determined that the upstr...

Page 28: ...IM P006 07 CTLS Issue 12 28...

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