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S201 and S202 Series

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  1.  Check to see that all appliances are turned off.
  2.  Slowly open the upstream block valve.
  3.  Check inlet and outlet pressure for correct values.
  4.  Check all connections for leaks.
  5.  Light the appliance pilots.

Adjustment

The range of allowable pressure settings is stamped 

on the nameplate.  If the required setting is not within 

this range, substitute the correct spring (as shown 

in Table 3).  If the spring is changed, change the 

nameplate to indicate the new pressure range.

A pressure gauge should always be used to monitor 

downstream pressure while adjustments are being made.
  1.  Remove the closing cap (key 4, Figure 5) or      

       loosen the hex locknut.

  2.  To increase the outlet setting, turn the adjusting  

       screw (key 3, Figure 5) clockwise.  To decrease  

       the outlet setting, turn the adjusting  

       screw counterclockwise.

  3.  Replace the closing cap or tighten the hex locknut.

Shutdown

Installation arrangements may vary, but in any 

installation it is important that the valves be opened 

or closed slowly and that the outlet pressure be 

vented before venting inlet pressure to prevent 

damage caused by reverse pressurization of the 

regulator.  The steps below apply to the typical 

installation as indicated.
  1.  Open the vent valves downstream of the regulator.
  2.  Slowly close the upstream block valve.
  3.  Inlet pressure will automatically be released  

      downstream as the regulator opens in response  

      to the lowered pressure on the diaphragm.

Maintenance

!

WARNING

To avoid personal injury or equipment 

damage, do not attempt any 

maintenance or disassembly without 

first isolating the regulator from system 

pressure and relieving all internal 

pressure as described in “Shutdown”.

Regulators that have been disassembled 

for repair must be tested for proper 

operation before returned to service.  

Only parts manufactured by  Emerson 

Process Management Regulator 

Technologies, Inc. should be used for 

repairing Fisher

® 

regulators.  Relight 

pilot lights according to normal 

startup procedures.
Due to normal wear or damage that 

may occur from external sources, this 

regulator should be inspected and 

maintained periodically.  The frequency 

of inspection and replacement of parts 

depends upon the severity of service 

conditions or the requirement of local, 

state, and federal rules and regulations.

Disassembly to Replace Diaphragm

  1.  Remove the closing cap (key 4, Figure 5) or      

       loosen hex locknut.  Turn the adjusting screw  

       or nut (key 3) counterclockwise to ease 

       spring compression.
  2.  For Types S201, S201H, S202, and S202H units,  

       remove the adjusting screw and spring (key 2).
       For Type S201K remove the adjusting screw,  

       hex locknut, and closing cap (key 4), the upper  

       spring seat (key 6), and spring (key 2).

  3.  Remove hex nuts (key 15) and cap screws 

      (key 14).  Separate the upper spring case (key 1)  

       from the lower casing assembly (key 9).

Note

If disassembling a Type S202 or S202h 

regulator, lift the upper spring case 

straight up in order to avoid hitting the 

stem (key 24).

  4.  Slide the diaphragm and diaphragm head assembly  

       (key 7) away from the body (key 21) to unhook the  

       pusher post (key 8) from the lever (key 10).  Lift off  

      the diaphragm and diaphragm head assembly.
  5.  Unscrew the cap or reset stem (key 24) which  

       fastens the lower spring seat (key 6) to the       

       pusher post to separate the lower spring seat,  

       diaphragm and diaphragm head assembly, and  

       pusher post.  (The relief valve spring (key 25) will  

       also have to be removed from Types S202 and  

       S202H regulators).

Summary of Contents for Fisher S202

Page 1: ...ulator Warning Figure 1 Typical S200 Gas Regulator W1919 Introduction Scope of the Manual This instruction manual provides instructions for installation adjustment maintenance and parts ordering information for Types S201 S201H S201K S202 and S202H gas service regulators Description S201 and S202 Series regulators are typically installed on industrial and commercial applications The Types S202 and...

Page 2: ...Typical start to discharge values are 7 inches w c to 2 psi 17 to 138 mbar above the outlet pressure setting depending on control spring used Available Configurations See Figure 3 Body Size and End Connection Styles 1 1 2 or 2 NPT inlet and outlet and NPS 2 DN 50 CL125 FF flanged Maximum Allowable Inlet Pressures 1 See Table 1 Maximum Emergency Outlet Pressure 1 15 psig 1 0 bar Outlet Pressure Ran...

Page 3: ...utdoor installations point the spring case vent downward to allow condensate to drain see Figure 4 This minimizes the possibility of freezing and of water or other foreign materials from entering the vent and interfering with proper operation Under enclosed conditions or indoors escaping gas may accumulate and be an explosion hazard In these cases the vent should be piped away from the regulator t...

Page 4: ...le 2 Outlet pressure more than 2 psi 0 14 bar light diaphragm head or 3 psi 0 21 bar heavy diaphragm head above the setpoint may damage internal parts such as the diaphragm head and valve disk The maximum emergency casing outlet pressure is 15 psig 1 0 bar Startup caution Pressure gauges should always be used to monitor downstream pressure during startup Procedures used in putting this regulator i...

Page 5: ...pressure and relieving all internal pressure as described in Shutdown Regulators that have been disassembled for repair must be tested for proper operation before returned to service Only parts manufactured by Emerson Process Management Regulator Technologies Inc should be used for repairing Fisher regulators Relight pilot lights according to normal startup procedures Due to normal wear or damage ...

Page 6: ... tear the diaphragm when reassembling 6 Reassemble the spring case unit in the reverse order of the above steps Before tightening the cap screw or stem into the pusher post place the loosely assembled diaphragm and diaphragm head assembly into position in the lower casing being sure that the pusher post is hooked on the lever Rotate the diaphragm so that the diaphragm and lower casing holes are al...

Page 7: ... and S202 Series 7 Figure 5 Type S202 Regulator Assembly 50A9455 parts not shown 46 apply LUB SEA ADH section a a A A VENT 62 61 58 55 60 56 57 59 18 4 5 3 2 6 8 9 7 1 32 14 15 10 25 16 13 21 20 19 12 11 24 ...

Page 8: ... Management Regulator Technologies Inc USA Headquarters McKinney Texas 75069 1872 USA Tel 1 800 558 5853 Outside U S 1 972 548 3574 Asia Pacific Singapore Singapore 128461 Tel 65 6777 8211 Europe Bologna Italy 40013 Tel 39 051 4190611 Gallardon France 28320 Tel 33 0 2 37 33 47 00 TESCOM Emerson Process Management Tescom Corporation USA Headquarters Elk River Minnesota 55330 2445 USA Tel 1 763 241 ...

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