Types 98LD and 98HD
2
Type 98LD: Pressure-loaded with handwheel
adjustment. Relief pressure ranges are 2 to
38 psig (0,14 to 2,62 bar).
Type 98HD: Direct-operated with standard
adjusting screw. Relief pressure ranges are 15 to
200 psig (1,03 to 13,8 bar).
Body Sizes and End Connection Styles
TYPE
BODY MATERIAL
Cast Iron
WCC Steel, CF8M Stainless steel,
Hastelloy
®
C, Monel
®
98LD
NPS 1/4, 1/2,
3/4, 1, NPT
NPS 1/4 through 1, NPT; NPS 1/2 through 1,
SWE, CL150 RF, CL300 RF, PN 16/25/40 RF
98HD
NPS 1/4, 1/2,
3/4, 1, 1-1/2,
2, NPT
NPS 1/4 through 2, NPT; NPS 1/2 through 2,
SWE, CL150 RF, CL300 RF, PN 16/25/40 RF
Maximum Cold Working Pressures of Body Size
and Material
(1)(2)
REGULATOR
BODY
SIZE
BODY AND
SPRING CASE
MATERIALS
MAXIMUM INLET
PRESSURE
(3)
,
PSIG (bar)
Type 98LD All Sizes
Cast Iron
Steel
Stainless Steel
60
150
150
(4,1)
(10,3)
(10,3)
Type 98HD All Sizes
Cast Iron
Steel
Stainless Steel
300
300
400
(20,7)
(20,7)
(27,6)
C
1
: 35
BODY SIZE,
NPS (DN)
X
T
F
D
F
L
K
m
1/4
0.78 0.50
0.91 0.83
1/2 (15) 0.83 0.69
3/4 and 1
(20 and 25)
0.88 0.77
1-1/2 and 2
(40 and 50)
0.92 0.85
Relief Pressure Ranges
See Table 1
Metal Seats: Class IV
PTFE: Class IV
Elastomer Seats: Class VI
Maximum Spring Case Loading Pressures, Psig (bar)
(Spring Setting Plus Loading Pressure)
(1)
TYPE
NUMBER
STEEL (WCC)
OR STAINLESS
STEEL BODY, SST /
ALL TRIMS TO
(2)
CAST IRON BODY
All Trims
(3)
Metal Trims
98LD
98HD
125 (8,62)
300 (20,7)
50 (3,4)
250 (17,2)
50 (3,4)
- - - -
50 (3,4)
- - - -
Maximum Temperature Ranges of Diaphragm and
Seat Materials
MATERIAL
Metal (All)
Nitrile (NBR)
Neoprene (CR)
Fluorocarbon (FKM)
Ethylenepropylene (EPDM)
Polytetrauoroethylene (PTFE)
PerFluorocarbon (FKM) (FFKM)
-40° to 450°F (-40° to 232°C)
-20° to 180°F (-29° to 82°C)
-40° to 180°F (-40° to 82°C)
0° to 300°F (-18° to 149°)
-40° to 450°F (-40° to 232°)
-40° to 450°F (-40° to 232°)
-20° to 450°F (-29° to 232°)
Maximum Temperature Ranges of Body Materials
REGULATOR
BODY AND SPRING
CASE MATERIALS
TEMPERATURE RANGE
Type 98LD
Type 98HD
Cast Iron
Steel
Stainless Steel
-40° to 406°F (-40° to 208°C)
-20° to 450°F (-29° to 232°C)
-40° to 450°F (-40° to 232°C)
Pressure Registration
Internal
Approximate Weights
Type 98HD
NPS 1/4 Body: 7 pounds (3 kg)
NPS 1/2 (DN 15) Body: 7 pounds (3 kg)
NPS 3/4 (DN 20) Body: 16 pounds (7 kg)
NPS 1 (DN 25) Body: 16 pounds (7 kg)
NPS 1-1/2 (DN 40) Body: 55 pounds (25 kg)
NPS 2 (DN 50) Body: 55 pounds (25 kg)
Type 98LD
NPS 1/4 Body: 6 pounds (3 kg)
NPS 1/2 (DN 15) Body: 13 pounds (6 kg)
NPS 3/4 (DN 20) Body: 30 pounds (14 kg)
NPS 1 (DN 25) Body: 30 pounds (14 kg)
1. The pressure/temperature limits in this Instructional Manual and any applicable standard or code limitation should not be exceeded.
2. Temperature and/or the body end connection may decrease these maximum pressures.
3. Maximum inlet pressure is equal to set pressure plus build-up.
4. Pressure and/or the body end connection may decrease these maximum temperatures.
5. Fluorocarbon is limited to 200°F (93°C) hot water.
Hastelloy
®
C is a mark owned by Haynes International, Inc.
Monel
®
is a mark owned by Special Metals Corporation
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