Pressure Tech SS-231 Series Operating And Service Manual Download Page 3


 

1. Description 

 
The  SS-231  is  a  versatile  non-venting  (NV),  piston  sensed 

medium-flow

  forward  reducing 

pressure regulator for gas and liquid applications.  
 
The  SS-231  as  standard  is  a  non-venting  regulator,  which  features  a  balanced  main  valve 
design  as  standard  which  minimises  load  on the  seat  and provides  stable pressure  control 
under decaying inlet conditions. Additionally, servicing is simplified with easy access to the 
seat cartridge from the base of the regulator. 
 
Operating  at  depths  of  up  to  3,000  metres  (10,000ft),  the  SS231  features  a  (NV)  1:1  ratio 
sensor  assembly,  as  standard  for  sub-sea  applications  and  incorporates,  the  option  of  the 
following top works assemblies, dependant of the functionality requirements: 

-

 

SR

’ 

- Spring Loaded with Reference to External Sea Water Pressure. 

(*Ref. 6.1.4 for 

Reference Port detail, circled in red)

 

-

 

SS

’ –

 Spring Loaded with Sealed Chamber to remain completely unaffected by the 

external sea water environment conditions. (

Without Reference port

 

Pressure Equipment Directive (PED) 2014/68/EC Declaration 
This equipment is designed and manufactured in accordance with Sound Engineering Practice 
(SEP) Article 4, Paragraph 3 of the directive 2014/68/EC. As such, CE marking must not be 
applied. The equipment is marked under section 3.3 of Essential Safety Requirements of the 
directive. 
 

2. Installation 

 
Before  system  start-up,  it  is  recommended  that  all  lines  should  be  free  from  any  form  of 
contaminations, as those can affect regulator performance and functionality. all systems be 
pressure tested, leak tested and purged with an inert gas such as nitrogen. 

 

Prior to placing into service ensure that the regulator is in the fully closed position, with the 
adjusting mechanism turned completely anti-clockwise. 
 
For  pre-set  regulators  the  supply  pressure  should  be  increased  gradually  and  also  to  be 
mindful that downstream pressure will be present. 
 
Check  the  model  number  reference  to  ensure  that  the  pressure  range  complies  with  the 
installation requirements.  
 
Visually  inspect  the  regulator  for  any  signs  of  damage  or  contamination.  If  any  foreign 
materials are present and cannot be removed from the regulator,  or if the threads on the 
regulator appear to be damaged, please contact the office immediately to arrange for the 
regulator to be returned for service. 
 
The Inlet and Outlet ports are clearly marked. Select the correct size and type of connection 
fittings  for  these  ports  which  are  indicated  in  the  regulators  part  number.  Both  British 

Summary of Contents for SS-231 Series

Page 1: ...1 THE SS 231 SERIES Operating and Service Manual Series includes all variants of SS 231 Issue A March 2020...

Page 2: ...ocation Usage 5 6 Servicing and Maintenance 5 6 1 Servicing the SS 231 Balanced Design 6 6 1 1 Accessing the Main Valve Assembly MVA 6 6 1 2 Accessing the Sensor Assembly SA 7 6 1 3 Adjusting the Set...

Page 3: ...cle 4 Paragraph 3 of the directive 2014 68 EC As such CE marking must not be applied The equipment is marked under section 3 3 of Essential Safety Requirements of the directive 2 Installation Before s...

Page 4: ...the first thread Any gauge ports on the regulator will be 1 4 NPT unless otherwise stated If any gauge port is not required ensure that the port is plugged prior to installation The media supplied to...

Page 5: ...ssures of the regulator which are indicated on the regulator label 4 Special Conditions for Safe Use The SS 231 series are pressure regulators and should not be used as an isolation valve When adjusti...

Page 6: ...the bottom nut 20 using a 30mm socket or open ended spanner NOTE Soft vice jaws must be used when securing the body within the vice against flats as without may cause damage to sealing surface for BSP...

Page 7: ...ctly and effectively installed it may be required to perform the appropriate seat leak test as per ANSI FCI 70 2 6 1 2 Accessing the Sensor Assembly SA To access the Sensor Assembly i Secure the regul...

Page 8: ...8 NOTE It is not necessary to remove the air deflector If it is required to replace or reassemble the part install finger tight and then tighten to 12Nm using a 20mm socket...

Page 9: ...ork assembly 1 14 16 17 IMPORTANT Ensure that the O ring 11 is correctly located into the O ring groove at base of the bonnet before placing on to the regulator body 26 xiii Position Bonnet 25 careful...

Page 10: ...m of the regulator v With the Regulator Body 26 secured in a vice apply the Maximum Working Pressure MWP to the Inlet of the regulator vi Using a slotted screwdriver turn the Adjusting Screw 13 clockw...

Page 11: ...D 9 1 OR BS028 O RING STD 10 1 OR BS4518 0091 16 O RING STD 11 1 OR BS4518 0291 16 O RING STD 12 1 PT 101 001 20MM SENSOR 13 1 PT 101T 002 ADJUSTING SCREW 14 1 PT BP 301 003 SPRING REST 15 1 PT BP 301...

Page 12: ...psi Nominal Operating Temperature 20 C to 80 C Materials Body Trim HT Brass 316 SS Seat PTFE PCTFE PEEK Flow Capacity Cv 1 0 Leakage Gas Liquid Bubble tight Zero drops of water at max inlet 8 Warrant...

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