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FL Series

14

Figure 6. PRX Series Pilot Assembly

TYPE PRX/120 OR PRX/125

TYPE PRX/120-AP OR PRX/125-AP

TYPE PRX/120 OR PRX/125

TYPE PRX/120-AP OR PRX/125-AP

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Summary of Contents for FL

Page 1: ...tion tight shutoff and long life The regulator utilizes a main valve actuator a Type PRX pressure reducing pilot and a Type SA 2 pilot supply pressure regulator The Type PRX pilot uses inlet pressure reduced by a Type SA 2 supply pressure regulator as loading pressure to operate the main valve actuator The outlet pressure is sensed through a control line on the main valve actuator and also on the ...

Page 2: ...o opposes the pilot control spring When outlet pressure drops below the setting of the pilot control spring pilot control spring force on the pilot diaphragm thus opens the pilot valve plug providing additional loading pressure to the actuator diaphragm This diaphragm loading pressure opens the main valve plug supplying the required flow to the downstream system Any excess loading pressure on the ...

Page 3: ...n If the working regulator fails the monitoring regulator assumes control and holds the outlet pressure at its outlet pressure setting Figure 2 Type FL Operational Schematic E0827 INLET PRESSURE OUTLET PRESSURE LOADING PRESSURE PILOT SUPPLY PRESSURE ATMOSPHERIC PRESSURE Working Monitoring Regulators figure 3 In a working monitoring system the upstream regulator requires two pilots and it is always...

Page 4: ...lified personnel when installing maintain ing or operating this regulator Inspect the regulator and the pipeline to be certain both are free of foreign materials 2 Install the regulator so that the flow arrow cast on the main valve matches the flow direction of process fluid through the regulator 3 Apply pipe compound to the male pipeline threads before installing a regulator with screwed end conn...

Page 5: ...tallation Figure 3 Installation Drawings A 4 x A 6 x A TYPE PRX 120 OR PRX 120 AP TYPE SA 2 B L S A A 4 x A 6 x A TYPE PRX 120 OR PRX 120 AP TYPE PRX 120 OR PRX 120 AP TYPE SA 2 B L S A B L S A A 4 x A 6 x A TYPE PRX 120 OR PRX 120 AP TYPE PRX 125 OR PRX 125 AP TYPE PRX 120 OR PRX 120 AP TYPE SA 2 TYPE SA 2 B L S A B L S A B L S A E0825 ...

Page 6: ...l spring Turning the adjusting screw clockwise into the spring case increases the spring compression and pressure setting Turning the adjust ing screw counterclockwise decreases the spring compression and pressure setting Pilot Adjustment To adjust a standard Type PRX pilot loosen the locknut and turn the adjusting screw Then tighten the locknut to maintain the adjustment position Startup 1 Open t...

Page 7: ...e while at the same time adjusting the pilot setting if necessary 4 Completely open the downstream block valve 5 Slowly close the bypass valve if any Working Monitor Regulator Installation All Type FL working monitor regulators are bench set at the factory according to the service conditions specified on the customer s order Examine the unit on arrival to make sure no damage has occurred in shipme...

Page 8: ...l desired intermediate pressure is reached 3 Adjust the second stage working regulator to the desired distribution pressure by following instructions for that particular regulator 4 Adjust the setting of the monitoring pilot to establish the desired emergency distribution pressure which is to be maintained in the event of failure of the second stage working regulator The steps followed may vary wi...

Page 9: ... screw key 25 and pad retainer key 21 replace pad if necessary 4 Reinstall the pad Main Valve Diaphragm Maintenance 1 Place main valve with inlet side up 2 Remove the travel indicator assembly by removing the indicator cover key 40 and indicator bushing key 38 Check O ring key 37 replace if necessary Remove the indicator support key 36 Check O ring key 35 replace if necessary Lift out indicator st...

Page 10: ...Set the lower diaphragm plate key 15 into the body key 16 8 Lightly lubricate the rims of the diaphragm key 14 and place it in the body key 16 on top of the lower diaphragm plate key 15 9 Set the upper diaphragm plate key 13 on top of the diaphragm key 14 10 Place washer key 11 and stem nut key 26 on the stem key 19 and tighten using a wrench to hold the stem 11 Set the spring carrier key 6 Damper...

Page 11: ...Type number when contacting your Fisher Sales Office or Sales Representative for technical information When ordering parts also be sure to include the complete 11 character part kit number Parts List FL Main Valve figure 4 Key Description Part Kit includes key number 2 3 4 10 18 20 26 28 35 38 46 and 47 See Table 1 Inlet Flange 2 Anti Friction Ring 3 O Ring 4 Body O Ring 5 Screw 6 Spring 7 Fitting...

Page 12: ...FL Series 12 Figure 4 FL Assembly ...

Page 13: ...bly SRS Main Valve figure 5 Key Description 23 Gasket 24 Flange Spacer 200 Body 201 Retainer 202 Stud 203 Atenuator Plate 204 Spring Pin 205 Flange 206 Nut 207 Atenuator Plate 208 Atenuator Plate 209 Spacer 210 Spring Cage 211 Spring ...

Page 14: ...FL Series 14 Figure 6 PRX Series Pilot Assembly TYPE PRX 120 OR PRX 125 TYPE PRX 120 AP OR PRX 125 AP TYPE PRX 120 OR PRX 125 TYPE PRX 120 AP OR PRX 125 AP ...

Page 15: ...wer Cover O Ring 19 Orifice 20 Nut 21 Lower Cover 22 Pad Holder 23 Stem 24 Nameplate 26 Upper Diaphragm Nut 27 Damper Adjusting Screw 28 1 Restrictor Damper O Ring 29 Plate 30 Ring Nut 31 Damper Restrictor Screw 32 Restrictor Adjusting Screw with Hole 33 Plug 34 Plug Type SA 2 Pilot Supply Filter Regulator figure 7 Description Part Number Elastomer Parts Kits includes keys Nitrile GD89995X012 Fluo...

Page 16: ...s orimplied regardingtheproductsorservicesdescribedhereinortheiruseorapplicability Wereservetherighttomodifyorimprovethedesignsorspecificationsofsuchproductsatanytimewithoutnotice Fisher does not assume responsibility for the selection use or maintenance of any product Responsibility for proper selection use and maintenance of any Fisher product remains solely with the purchaser For information co...

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