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Specifications

Specifications for the Type LR128 relief valve or backpressure regulator are shown below. Other information for the main 

valve appears on the nameplate. The control spring range for the pilot is marked on the nameplate of Type MR98H pilot.

Main Valve Body Sizes, End Connection Styles  

and Structural Design Ratings

(1)

See Table 1

Maximum Inlet Pressures

(1)

Type LR128 Main Valve:

 See Table 1

Type MR98H Pilot:

 

See Table 2

Type 112 Restrictor:

 1500 psig / 103 bar

Maximum Outlet Pressure

Type LR128 Main Valve:

 See Table 1

Type MR98H Pilot:

 450 psig / 31.0 bar

Relief Set Pressure/Backpressure Control Ranges

See Table 3

Main Valve Plug Travel

1 in. / DN 25:

 0.37 in. / 9.4 mm

2 in. / DN 50:

 0.68 in. / 17 mm

3 in. / DN 80:

 0.98 in. / 25 mm

4 in. / DN 100:

 1.19 in. / 30 mm

Main Valve Minimum Differential Pressures

(1) 

See Table 6

Main Valve Maximum Differential Pressures

(1) 

See Table 7

Main Valve Internal Inlet Strainer Sizes

1 in. / DN 25:

 12 Mesh (0.0661 in. / 1.68 mm)

(2)

2, 3 and 4 in. / DN 50, 80 and 100:

 10 Mesh 

(0.0787 in. / 2.00 mm)

(2)

Temperature Capabilities

(1)

See Table 10

Pressure Registration

External:

 1/8 NPT

Spring Case Vent

Type Y602-12

Construction Materials

Type LR128 Main Valve

Body:

 WCC Steel, CF8M or CF3M Stainless steel

Bonnet:

 LF2 Steel or 316/316L Stainless steel

Bonnet Bushing:

 416 Hardened Stainless steel

Cage:

 15-5 Stainless steel

Construction Materials (continued)

Type LR128 Main Valve (continued) 

Spring:

 302 Stainless steel or 17-7 Stainless steel

Top Plug:

 17-4 Stainless steel

Bottom Plug:

 416 Stainless steel

Inlet Strainer:

 Stainless steel

Diaphragm:

 Nitrile (NBR) or Fluorocarbon (FKM)

O-Rings:

 Nitrile (NBR) or Fluorocarbon (FKM)

Flanged Locknut:

 17-4 Stainless steel 

Backup Rings:

 Polytetrafluoroethylene (PTFE)

Upper Spring Seat:

 416 Stainless steel

Indicator Protector and Cover:

 Plastic

Indicator Stem:

 303 Stainless steel

Indicator Fitting:

 416 Stainless steel

Travel Indicator Plug:

 416 Stainless steel

Type MR98H Pilot

Body:

 WCC Steel or CF8M Stainless steel

Spring Case:

 WCC Steel or CF8M Stainless steel

Orifice:

 416 Stainless steel

Valve Plug:

 416 Stainless steel

Guide and Pusher Post:

 416 Stainless steel

Gasket:

 Nitrile (NBR) or Fluorocarbon (FKM)

O-rings:

 Nitrile (NBR) or Fluorocarbon (FKM)

Diaphragm:

 Neoprene (CR) or Fluorocarbon (FKM)

Mounting Parts

Pilot Mounting Pipe Nipple:

 Plated steel or 

Stainless steel

Pipe Fittings:

 Plated steel or Stainless steel

Tubing:

 Stainless steel

Type 112 Restrictor

Body:

 15-5 Stainless steel

Groove Valve:

 416 Stainless steel

Retainer:

 416 Stainless steel

Pipe Plug:

 316 Stainless steel 

O-rings:

 Nitrile (NBR) or Fluorocarbon (FKM)

Options

•  Pre-piped Pilot Supply

•  Travel Indicator

1. The pressure/temperature limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded.

2. Nominal sieve opening.

2

Type LR128

Содержание FISHER LR128 Series

Страница 1: ...Regulator Figure 1 Type LR128 Relief Valve or Backpressure Regulator and Type MR98H Pilot TYPE LR128 REGULATOR TYPE MR98H PILOT WARNING Failure to follow these instructions or to properly install and maintain this equipment could result in bursting of the equipment and or chemical contamination causing property damage and personal injury or death Fisher relief valves and backpressure regulators mu...

Страница 2: ...d Stainless steel Cage 15 5 Stainless steel Construction Materials continued Type LR128 Main Valve continued Spring 302 Stainless steel or 17 7 Stainless steel Top Plug 17 4 Stainless steel Bottom Plug 416 Stainless steel Inlet Strainer Stainless steel Diaphragm Nitrile NBR or Fluorocarbon FKM O Rings Nitrile NBR or Fluorocarbon FKM Flanged Locknut 17 4 Stainless steel Backup Rings Polytetrafluoro...

Страница 3: ...gh pressure relief pilot for 25 to 375 psig 1 7 to 25 9 bar set pressures Designed to handle inlet pressures up to 450 psig 31 0 bar Principle of Operation Figure 2 A pressure relief valve is a throttling pressure control device that limits pressure build up it opens to prevent the rise of internal pressure in excess of a specified value Fisher relief valves cannot be used as ASME safety relief va...

Страница 4: ...0 CL150 RF 290 20 0 290 20 0 290 20 0 CL300 RF 750 51 7 450 31 0 450 31 0 CL600 RF 1500 103 PN 16 25 40 RF 580 40 0 CF8M Stainless steel NPT 1 and 2 in only 1440 99 2 450 31 0 450 31 0 CL150 RF 275 19 0 275 19 0 275 19 0 CL300 RF 720 49 6 450 31 0 450 31 0 CL600 RF 1440 99 2 PN 16 25 40 RF 580 40 0 1 The pressure temperature limits in this Instruction Manual and any applicable standard or code lim...

Страница 5: ...ackpressure regulator to be installed indoors or outdoors Type LR128 is designed to withstand the elements The powder paint coating protects against minor impacts abrasions and corrosion When installed outdoors the Type LR128 does not require protective housing However the Type MR98H pilot should be oriented so that the pilot spring case vent is pointed down Otherwise make sure the vent is protect...

Страница 6: ...pply a good grade of pipe compound to the external pipeline threads for a threaded body or use suitable line gaskets for a flanged body Use approved piping procedures when installing the relief valve or backpressure regulator When used in relief valve service the Type LR128 may leak toxic chemical to the environment In toxic or hazardous liquid service leaked chemical may accumulate and cause pers...

Страница 7: ... sure the pilot exhaust is pointed in the correct direction Shutdown 1 Close upstream block valve first and then close the downstream block valve 2 Open downstream and upstream vent valves not shown Pilot Adjustment The factory setting of the regulator can be varied within the pressure range stamped on the nameplate To change the set control pressure loosen the jam nut key 17 Figure 16 and turn th...

Страница 8: ...the restrictor Regular inspection maintenance and cleaning of the strainer is recommended to ensure optimum performance Recommended Type 112 Restrictor Settings and Restrictor Setting Guide Table 4 and Figure 5 This guide can be used to adjust performance according to application conditions The recommended initial setting is 6 for the 1 2 and 3 in sizes and 8 for the 4 in size see Table 4 WARNING ...

Страница 9: ...Remove the diaphragm key 9 and plug key 11 assembly and bonnet O ring key 28 4 Pull out the cage key 7 O ring key 8 and inlet strainer key 23 5 Clean parts and replace if necessary 2 Lightly lubricate and install the cage O ring key 8 3 Apply lubricant lightly to all O rings or the mating part before installing them 4 Install the cage key 7 and lightly lubricate and install the bonnet O ring key 2...

Страница 10: ...NG COLOR SET PRESSURE 1 BUILDUP OVER SET PRESSURE NEEDED TO BEGIN OPENING OF MAIN VALVE 2 BUILDUP OVER SET PRESSURE NEEDED TO FULLY OPEN MAIN VALVE 3 PRESSURE DROP BELOW SET PRESSURE NEEDED TO RESEAT PILOT psig bar psig bar psig bar psig bar 35 to 75 psig 2 4 to 5 2 bar ERAA01910A0 Green 35 2 4 1 0 07 1 0 07 2 0 14 50 3 4 1 0 07 1 0 07 2 0 14 75 5 2 1 0 07 6 0 41 2 0 14 70 to 140 psig 4 8 to 9 7 b...

Страница 11: ...spaces of the restrictor debris clogging the gaps inside the restrictor clogged pilot supply filter strainer BODY SIZE DIAPHRAGM MATERIAL MAXIMUM OPERATING INLET PRESSURE 3 MAXIMUM OPERATING DIFFERENTIAL PRESSURE 3 MAXIMUM EMERGENCY INLET AND DIFFERENTIAL PRESSURE DIAPHRAGM STYLE In DN psig bar psid bar d psid bar d 1 25 17E68 Nitrile NBR Low temperature 450 31 0 400 27 6 450 31 0 130 17E97 Nitril...

Страница 12: ...ey 11 This loosens the entire assembly Note On 1 in DN 25 body remove the socket head screw key 129 and lock washer key 130 from the bottom plug 3 Remove the bottom plug key 11 and the bottom plug O ring key 10 4 Remove the diaphragm key 9 5 Remove the top plug O rings keys 14 and 70 6 Check all components for damage or wear and replace as necessary 7 When reassembling be sure to lubricate all O r...

Страница 13: ...icator stem key 15 4 Use a wrench to remove indicator fitting key 19 5 Lift out travel indicator assembly If replacing travel indicator with travel indicator plug skip to step 9 6 Compress the main spring key 12 Remove the second hex nut key 4 Parts will separate easily when the hex nut is removed 7 Slide the indicator stem key 15 out of the indicator fitting key 19 The main spring key 12 and uppe...

Страница 14: ...ure 15 and tighten to proper torque see Table 11 Due to normal wear and damage that may occur from external sources relief valve parts such as the O rings gaskets diaphragm orifice and valve plug should be inspected periodically and replaced as necessary The frequency of inspection and replacement depends upon the severity of service conditions or the requirements of state and federal laws The fol...

Страница 15: ...ile releasing these pressures Note Accumulated dirt mineral deposit clogged debris or sediment buildup inside the restrictor may cause the unit response to get slower and unit performance to decrease If any of these is suspected immediately inspect and clean the restrictor Perform the following procedure if O rings are leaking or if there is a need to inspect and remove accumulated dirt mineral de...

Страница 16: ...re 20 to 150 F 29 to 66 C 0 to 150 F 18 to 66 C 0 to 250 F 18 to 121 C 1 General Applications Best for low pressure differential and cold temperature service applications Best for abrasive or erosive service applications Best for high temperature applications Heavy Particle Erosion Fair Excellent Good 1 Fluorocarbon FKM is limited to 200 F 93 C in hot water THICKNESS MATERIAL DIAPHRAGM MATERIAL Im...

Страница 17: ...012 PN 16 25 40 RF GE13625X012 CF8M Stainless steel NPT GE11581X022 CL150 RF GE11583X022 CL300 RF GE11607X022 CL600 RF GE11608X022 PN 16 25 40 RF GE13625X022 CF3M Stainless steel CL150 RF GE11583X032 2 50 WCC Steel NPT GE10588X012 SWE GE10682X012 CL150 RF GE10676X012 CL300 RF GE10678X012 CL600 RF GE10679X012 PN 16 25 40 RF GE12898X012 CF8M Stainless steel NPT GE10588X022 CL150 RF GE10676X022 CL300...

Страница 18: ...DN 80 body 48B5961X012 4 in DN 100 body 48B2135X012 8 Cage O ring 1 in DN 25 body Nitrile NBR 14A5713X012 Fluorocarbon FKM 13A2351X012 2 in DN 50 body Nitrile NBR 10B4428X012 Fluorocarbon FKM 10B4428X022 3 in DN 80 body Nitrile NBR 10B4366X012 Fluorocarbon FKM 10B4366X022 4 in DN 100 body Nitrile NBR 10B4373X012 Fluorocarbon FKM 10B4373X022 9 Diaphragm 1 in DN 25 body 17E68 Nitrile NBR low differe...

Страница 19: ...4 in DN 80 and 100 bodies 29B2269X012 23 Inlet Strainer Stainless steel 1 in DN 25 body 20B8004X012 2 in DN 50 body 10B4409X012 3 in DN 80 body 20B4367X012 4 in DN 100 body 20B4374X012 24 Nameplate 25 Flow Arrow 26 Drive Screw Stainless steel 1 in DN 25 body 4 required 1A368228982 2 3 and 4 in DN 50 80 and 100 5 required 1A368228982 28 O ring 1 in DN 25 body Nitrile NBR 19B2838X012 Fluorocarbon FK...

Страница 20: ... CR ERCA00512A0 Fluorocarbon FKM 2 required ERCA00512A1 13 Nameplate 15 Adjusting Screw Use with all other springs GF05553X012 Use with 150 to 375 psig 10 3 to 25 9 bar spring ERAA02340A0 16 Cap Screw 8 required Steel ERCA00100A0 Stainless steel ERCA00100A1 Type MR98H Pilot Figure 16 continued Key Description Part Number 17 Jam Nut Steel ERCA00380A0 Stainless steel ERCA00380A1 18 Drive Screw 4 req...

Страница 21: ...PLY LUBRICANT 1 L1 LITHIUM POLYMER TYPE LUBRICANT MULTI PURPOSE GREASE L2 ANTI SEIZE LUBRICANT 1 Lubricants must be selected such that they meet the temperature requirements 24 3 25 26 21 20 22 15 4 6 18 16 63 12 28 9 1 23 19 17 2 14 L1 L1 L1 L1 L1 L2 L2 5 70 11 129 130 7 8 10 21 Type LR128 ...

Страница 22: ... LUBRICANT SEALANT 1 L1 LITHIUM POLYMER TYPE LUBRICANT MULTI PURPOSE GREASE L2 ANTI SEIZE LUBRICANT S MEDIUM STRENGTH THREADLOCKER 1 Lubricants and sealant must be selected such that they meet the temperature requirements 21 20 22 15 4 6 18 16 63 23 12 28 9 1 19 17 2 14 L1 L1 S S L1 L1 L2 L2 5 70 11 13 7 8 10 22 Type LR128 ...

Страница 23: ...dicator Plug Option 2 3 AND 4 IN DN 50 80 AND 100 BODY SIZES Figure 13 Type LR128 1 in DN 25 Diaphragm Assembly TOP PLUG KEY 5 O RING KEY 14 O RING KEY 70 DIAPHRAGM KEY 9 BOTTOM PLUG KEY 11 O RING KEY 10 LOCK WASHER KEY 130 SOCKET HEAD SCREW KEY 129 48B2142_C B2617_D 48B2142_C 19B2408 24 3 25 26 8 23 19 3 23 Type LR128 ...

Страница 24: ... 4 L2 L2 L2 L1 GF04916 APPLY LUBRICANT SEALANT 1 L1 GENERAL PURPOSE PTFE OR LITHIUM GREASE FOR O RINGS L2 ANTI SEIZE COMPOUND 1 Lubricants and sealants must be selected such that they meet the temperature requirements 2 Apply L2 anti seize compound on key 16 for stainless steel bolts 24 Type LR128 ...

Страница 25: ...e 112 Restrictor 20B4393 E APPLY LUBRICANT SEALANT 1 S THREAD SEALANT L ANTI SEIZE LUBRICANT 1 Lubricant and sealant must be selected such that they meet the temperature requirements 24 21 22 23 14 S L 25 Type LR128 ...

Страница 26: ...Figure 18 Standard Type LR128 with Type MR98H Pilot and Type 112 Restrictor 45 29 TYPE MR98H PILOT TYPE 112 RESTRICTOR ERAA03109 45 29 26 Type LR128 ...

Страница 27: ...ERAA03110 Figure 19 Type LR128 with Type MR98H Pilot and Type 112 Restrictor with Pre piped Pilot Supply TYPE 112 RESTRICTOR 45 61 62 60 29 59 TYPE MR98H PILOT 45 61 62 60 29 59 27 Type LR128 ...

Страница 28: ...tions which are available upon request We reserve the right to modify or improve the designs or specifications of such products at any time without notice Emerson Process Management Regulator Technologies Inc does not assume responsibility for the selection use or maintenance of any product Responsibility for proper selection use and maintenance of any Emerson Process Management Regulator Technolo...

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