Emerson MR98 Instalační příručka stáhnout pdf (Strana 2)

MR98 Series

Table 1. MR98SeriesBodySizesandPressureRanges



or where conditions exceed any ratings of the

adjacent piping or piping connections.





(as required by the appropriate code, regulation



exceeding limits.





in personal injury and property damage due to





in a safe location.

Clean out all pipelines before installation of the relief valve or

backpressure regulator and check to be sure the relief valve or

backpressure regulator has not been damaged or has collected

foreign material during shipping. For NPT bodies, apply pipe

compound to the external pipe threads. For anged bodies, use

suitable line gaskets and approved piping and bolting practices.

Install the relief valve or backpressure regulator in any position

desired, unless otherwise specied, but be sure ow through the

body is in the direction indicated by the arrow on the body.















positioned so that water, ice and other foreign

materials cannot enter the spring case through











Maximum inlet pressure depend upon body materials and

temperatures. See Specications section or the maximum inlet

pressure of the valve and the maximum spring case loading

pressures stamped on the nameplate of Types MR98LD,

MR98HD and MR98HHD. The valve should be inspected for

damage after any overpressure condition. 





Startup

The relief valve or backpressure regulator is factory set at

approximately the midpoint of the spring range or the pressure

requested, so an initial adjustment may be required to give

the desired results. With proper installation completed and

relief valves properly adjusted, slowly open the upstream and

downstream shutoff valves (if applicable).



To change the control pressure, remove closing cap or loosen

the jam nut and turn the adjusting screw clockwise to increase

control pressure or counterclockwise to decrease pressure.

Monitor the control pressure with a test gauge during the

adjustment. Replace closing cap or tighten the jam nut to

maintain the desired setting.











attempting disassembly.

TYPE

BODY SIZE 

(1)

 Inch bar psig

MR98L and MR98LD 15, 20 and 25 1/4 NPT, 1/2, 3/4 and 1

0.14 to 0.48 2 to 7

0.41 to 0.97 6 to 14

0.83 to 1.7 12 to 25

1.4 to 2.6 20 to 38

MR98H and MR98HD

15, 20 and 25 1/4 NPT, 1/2, 3/4 and 1

1.0 to 2.4 15 to 35

1.7 to 5.2 25 to 75

4.8 to 9.7 70 to 140

9.0 to 13.8 130 to 200

40 and 50 1-1/2 and 2

0.34 to 2.4 5 to 35

1.4 to 4.5 20 to 65

3.4 to 6.9 50 to 100

5.2 to 11.7 75 to 170

MR98HH and MR98HHD 15, 20 and 25 1/4 NPT, 1/2, 3/4 and 1 10.3 to 25.9 150 to 375

1. All springs may be backed off to 0 bar / 0 psig. However, highest capacities and best performances are obtained by using these springs in their recommended ranges.

Table 2.MaximumColdWorkingPressuresofBodySizeandMaterials

(1)(2)



TYPE

BODY SIZE 









PRESSURE





bar psig bar psig bar psig

MR98L/

MR98LD

All Sizes

Gray Cast Iron 4.14 60 4.14 60 3.44 50

Steel; Stainless Steel; Monel

; Hastelloy

C 10.3 150 10.3 150 8.61 125

MR98H/

MR98HD

All Sizes

Gray Cast Iron 20.7 300 20.7 300 17.2 250

Steel; Stainless Steel; Monel

;

Hastelloy

C; Aluminum-Bronze 20.7 300 20.7 300 20.7 300

MR98HH/

MR98HHD

All Sizes All available materials 27.6 400 27.6 400 20.7 300

1. The pressure/temperature limits in this Installation Guide and any applicable standard limitation should not be exceeded.

2. Temperature, trim material and/or the body end connection may decrease these maximum pressures.

3. Maximum inlet pressure equals set pressure plus build-up.

Monel

is a mark owned by Special Metals Corporation.

Hastelloy

C is a mark owned by Haynes International, Inc.

1 2 3 4

MR98 Series 1

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