Emerson 98 Data Sheet

Bulletin 71.4:98

November 2009

98 Series Backpressure Regulators

and Relief Valves

W6155

TYPE 98H

W6158

TYPE 98HD

Figure 1. Typical 98 Relief Valves

Introduction

The 98 Series (Figure 1) is used for backpressure or relief applications in liquid, gas, air, and steam service. The Types 98L, 98H, and 98HH are directoperated and spring-loaded. The Types 98LD and

98HD use additional pressure loading to maintain relief differential pressures, backpressures or for remote setpoint adjustment.

The Type 98HM is a direct-operated, spring to close regulator for backpressure or relief applications in liquid, gas, or steam service. The regulator requires no external power to operate and features a sensing line connection for sensing pressure externally from the regulator. A seal washer for the set screw can be included when applications require pressure loading of the spring case (not available on NPS 1-1/2 and 2 bodies (DN 40 and 50)).

Using a Type 98HM as a relief valve does not exclude the installation of an ASME certified full flow valve as specified by local codes and regulations or system design.

Hastelloy® C is a mark owned by Haynes International, Inc.

Monel® is a mark owned by Special Metals Corporation.

W6157

TYPE 98LD

W6156

TYPE 98L

Features

 •  Versatility—Typical applications include

 backpressure on pumps, maintaining differential

 pressure across lubricated seals, steam header

 pressure, fuel and oil lines, air supply systems, pump bypass applications for API general and special purpose lube and seal oil systems, relief applications for flash tanks and accumulators, and other process and industrial uses.

 •  Excellent Fluid Compatibility—Diaphragms come

 in stainless steel, Monel®, Hastelloy® C, or elastomers, and body is available in cast iron and steel as well as

 stainless steel, Hastelloy® C, and Monel®. Corrosion-

 resistant trims are available.

 •  Close, Stable Regulation—Diaphragm is isolated

 from the main flow stream. Slotted valve plug and

 pusher post assembly provides positive guiding for

   improved shutoff.

 •  Compact Design—Small size allows easy

 installation in limited spaces.

D100153X012

www.fisherregulators.com

Bulletin 71.4:98

Specifications

Available Constructions

Type 98L: Direct-operated low-pressure backpressure/relief valve with internal pressure registration and standard adjusting screw for

2 to 38 psig (0,14 to 2,6 bar) set pressure range

Type 98LD: Pressure-loaded low-pressure backpressure/relief valve with internal pressure registration and handwheel adjustment for 2 to 38 psi (0,14 to 2,6 bar) differential set pressure range

Type 98H: Direct-operated high-pressure backpressure/relief valve with internal pressure registration and standard adjusting screw for

5 to 200 psig (0,35 to 13,8 bar) set pressure range

Type 98HD: Pressure-loaded low-pressure

  backpressure/relief valve with internal pressure registration and handwheel adjustment for

5 to 200 psi (0,35 to 13,8 bar) differential set pressure range

Type 98HH: Direct-operated high-pressure

  backpressure/relief valve with internal pressure registration and standard adjusting screw for 150 to 375 psig (10,3 to 25,9 bar) set pressure range

Type 98HHD: Pressure-loaded high-pressure

  backpressure/relief valve with internal pressure registration and handwheel adjustment for 150 to 375 psi (10,3 to 25,9 bar) differential set pressure range

Type 98HM: Direct-operated high-pressure backpressure/relief valve with external pressure registration and standard adjusting screw for 5 to 275 psig (0,35 to 19,0 bar) set pressure range

Body Sizes and End Connection Styles

		BODY MATERIAL
	TYPES		WCC Steel,
		Cast Iron	CF8M Stainless steel,
			Hastelloy® C, Monel®
			1/4 through 1 NPT,
	98L and 98LD	1/4, 1/2, 3/4, 1 NPT	NPS 1/2 through 1 SWE,
			CL150RF, CL300RF,
			PN 16/25/40 RF
			1/4 through 2 NPT,
	98H and 98HD	1/4, 1/2, 3/4, 1,	NPS 1/2 through 2 SWE,
		1-1/2, 2 NPT	CL150 RF, CL300 RF,
			PN 16/25/40 RF
	98HM	- - - -	1/2, 3/4, 1, 1-1/2, 2 NPT
	98HH, 98HHD	1/4, 1/2,	3/4, 1 NPT

Construction Materials

BODY	SPRING CASE
Cast iron, WCC Steel, CF8M	Cast iron, WCC Steel, or
Stainless steel, Monel®, or
Hastelloy® C	CF8M Stainless steel

Trim Materials

See Table 1

Maximum Cold Working Pressures of Body Size

and Material(1)(3)

		BODY	BODY AND	MAXIMUM INLET
	REGULATOR		SPRING CASE	PRESSURE(2)(4)
		SIZE	MATERIALS	PSIG (bar)
			Cast Iron	60 (4,1)
	Type 98L	All Sizes	Steel	125 (8,6)
			Stainless Steel	125 (8,6)
			Cast Iron	60 (4,1)
	Type 98LD	All Sizes	Steel	150 (10,3)
			Stainless Steel	150 (10,3)
			Cast Iron	300 (20,7)
	Type 98H	All Sizes	Steel	300 (20,7)
			Stainless Steel	300 (20,7)
			Cast Iron	300 (20,7)
	Type 98HD	All Sizes	Steel	400 (27,6)
			Stainless Steel	400 (27,6)
	Type 98HH,		Cast Iron	400 (27,6)
		All Sizes	Steel	400 (27,6)
	98HHD
			Stainless Steel	400 (27,6)
	Type 98HM	All Sizes	Steel	300 (20,7)
			Stainless Steel	300 (20,7)

Relief Pressure Ranges

See Table 2

Temperature Capabilities for Elastomer Parts(1)(5)

MATERIAL	TEMPERATURE RANGE
Nitrile (NBR)	-40° to 180°F (-40° to 82°C)
Neoprene (CR)	-40° to 180°F (-40° to 82°C)
Fluorocarbon (FKM)(6)	0° to 300°F (-18° to 149°C)
	Limited to 200°F (93°C) for hot water
Ethylenepropylene (EPDM)(6)	-40° to 275°F (-40° to 135°C)
Perfluoroelastomer (FFKM)(6)	0° to 425°F (-18° to 218°C)
Polytetrafluoroethylene (PTFE)	-40° to 400°F (-40° to 204°C)
Diaphragm protector(6)

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

   2. Loading pressure plus spring setting should not exceed maximum inlet pressure.

    3. Temperature and/or the body end connection may decrease these maximum pressures.   4. Maximum inlet pressure equals set pressure plus build-up.

  5. Pressure and/or the body end connection may decrease these maximum temperatures.

   6. Not for use on steam service.

   7. Not available for Type 98HM.

2

Bulletin 71.4:98

Specifications (continued)

Temperature Capabilities for Metal Parts(1)(5)

MATERIAL	TEMPERATURE RANGE
Cast Iron(7)	-40° to 406°F (-40° to 208°C)
WCC Steel	-20° to 450°F (-29° to 232°C)
CF8M Stainless steel, Monel®, or	-40° to 450°F (-40° to 232°C)
Hastelloy® C

Maximum Spring Case Loading Pressure for Types 98LD and 98HD (Spring Setting Plus Loading Pressure)(1)(2)

Type 98LD Spring Case

Cast Iron: 50 psig (3,4 bar)

Steel or Stainless steel: 125 psig (8,6 bar)

Type 98HD Spring Case

Cast Iron: 235 psig (16,2 bar)

Steel or Stainless steel: 300 psig (20,7 bar)

Type 98HHD Spring Case

Cast Iron: 250 psig (17,2 bar)

Steel or Stainless steel: 250 psig (17,2 bar)

Capacities

Types 98L and 98LD: See Tables 3 through 7 Types 98H and 98HD: See Tables 8 through 12 Type 98HH and 98HHD: See Tables 13 through 17 Type 98HM: See Tables 18 through 21

Shutoff Classification Per ANSI/FCI 70-3-2004

Metal Seats: Class IV

PTFE: Class IV

Elastomer Seats: Class VI

Flow Coefficient

C1: 35

Type 98HM Sensing Line Connection 1/2, 1-1/2, or 2 NPT body: 1/8 NPT 3/4 or 1 NPT body: 1/4 NPT

IEC Sizing Coefficients

	BODY SIZES,	XT	FD	FL	Km
	NPS (DN)
	1/4			0.91	0.83
	1/2 (15)			0.83	0.69
	3/4 and 1	0.78	0.50	0.88	0.77
	(20 and 25)
	1-1/2 and 2			0.92	0.85
	(40 and 50)

Options

•  Handwheel or tee handle for Types 98L, 98H, and 98HH

•  Tapped spring case vent for Types 98L, 98H,

98HH, and 98HM

•  Seal washer to permit spring case pressure loading for Types 98L, 98H, 95HH, and 98HM

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

   2. Loading pressure plus spring setting should not exceed maximum inlet pressure.

  5. Pressure and/or the body end connection may decrease these maximum temperatures.     7. Not available for Type 98HM.

 •  Differential Pressure Capability—Spring-loaded

 PTFE packing and tapped connections permit pressure loading of Types 98LD and 98HD spring cases.

 •  Handwheels—Handwheels (standard on the

 Types 98LD and 98HD and optional on some sizes of the Types 98L and 98H) allow easy pressure setting changes.

 •  Sour Gas Service Capability—Optional

 materials are available for applications handling

 sour gases. These constructions comply with

 the recommendations of NACE International

  Standards MR0175 and MR0103.

Principle of Operation

Relief or backpressure valves respond to changes in upstream pressure. Pressure changes register under the diaphragm (see Figure 2) through a registration

hole in the valve body (through upstream sensing line connection for Type 98HM). When the pressure increases beyond the spring setting, the diaphragm pressure overcomes the spring compression. This causes the valve plug to move away from the orifice. The flow line through the valve is open and excess pressure is vented. When upstream pressure drops back to normal, the valve resumes its closed position.

The chart in Figure 3 illustrates the operation of an NPS 1/2 (DN 15) body used in air service. As the inlet pressure increases, initial flow occurs at the bubble point of 10.5 psig (0,72 bar). Flow increases with further rises in the inlet pressure, reaching

500 SCFH (13,4 Nm3/h) at the relief pressure setting of 12 psig (0,83 bar). Greater capacities are obtained with higher build-ups over the relief pressure setting, as shown in the capacity tables.

When the inlet pressure decreases, flow decreases until the valve reseals to reseat point of 9 psig (0,62 bar).

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Bulletin 71.4:98

REGISTRATION

HOLE

COMP

METAL DIAPHRAGMS

SPRING

					GASKET
				DIAPHRAGM
					FOR TYPE 98H WITH TWO METAL DIAPHRAGMS
				VALVE PLUG	(ALSO TYPICAL OF 98HH AND 98L EXCEPT FOR
					TYPE 98L, 1/4 NPT, 2 TO 7 PSI (0,14 TO 0,48 bar) RANGE)

O-RING SEAT	SPRING	METAL DIAPHRAGMS

ORIFICE

GASKET

INLET PRESSURE

OUTLET PRESSURE

ATMOSPHERIC PRESSURE

A6925

TYPE 98L (1/4 NPT, 2 TO 7 PSI (0,14 TO 0,48 bar) RANGE)

WITH ONE METAL DIAPHRAGM

TYPE 98H (ALSO TYPICAL OF 98L AND 98HH)

HANDWHEEL

METAL DIAPHRAGMS

CONTROL SPRING

SPRING

VALVE PLUG GUIDE

GASKET

FOR TYPE 98HD/LD/HHD WITH TWO METAL DIAPHRAGMS,

ASSEMBLE DIAPHRAGM GASKETS UNDER AND ABOVE

THE METAL DIAPHRAGMS AS SHOWN ABOVE

INLET PRESSURE

OUTLET PRESSURE

LOADING PRESSURE

M1005

TYPE 98HD (ALSO TYPICAL OF 98LD AND 98HHD)

Figure 2. 98 Series Operational Schematic

4

Bulletin 71.4:98

METAL DIAPHRAGMS

SPRING

GASKET

TO UPSTREAM

SENSING LINE

FOR TYPE 98HM WITH TWO METAL DIAPHRAGMS,

ASSEMBLE DIAPHRAGM GASKETS UNDER AND ABOVE

THE METAL DIAPHRAGMS AS SHOWN ABOVE

INLET PRESSURE

OUTLET PRESSURE

ATMOSPHERIC PRESSURE

M1155

TYPE 98HM

Figure 2. 98 Series Operational Schematic (continued)

Once the valve has resealed, leakage will not occur again until the bubble point pressure of 10.5 psig (0,72 bar) is reached.

Table 22 shows typical pressure differences between the relief pressure setting and the bubble point, and between the relief pressure setting and the reseat point. These differences are to be used in conjunction with the capacity tables to determine the total inlet pressure increase required to develop the tabulated flows and to determine the actual inlet pressure reductions required for reseat point.

Capacity Information

Relieving capacities at selected pressures and outlet pressure flows are given in SCFH (60°F and 14.7 psia) of air in Tables 6, 7, 11, 12, 16, 17, 18, and 19. To determine the equivalent capacities for other gases, multiply the table capacities by the following appropriate conversion factors: 1.29 for 0.6 specific gravity natural gas, 0.808 for propane, 0.707 for butane, or 1.018 for nitrogen. For gases of other specific gravities, divide by the square root of the appropriate specific gravity.

Then, if capacity is desired in normal cubic meters per hour at 0°C and 1,01325 bar, multiply SFCH by 0.0168.

Typical relieving capacities in pounds per hour and kilogram per hour of saturated steam are shown in Tables 5, 10, and 15.

Tables 3, 4, 8, 9, 13, 14, 20, and 21 gives relieving capacities in U.S. gallons per minute and in liters per minute of water.

Sizing

Determine Flow Rates for units used as differential relief valves as follows:

Air and Steam Service

When the Capacity Information section do not cover the actual service conditions, it will be necessary to calculate the flow rate available from the relief valve.

Step 1.

From the Capacity Information section determine a flow rate using the closest available data for setpoint

5

Bulletin 71.4:98

and build-up. With this information, calculate a flow coefficient using the following:

Equation 1:

Q

Cg =

3417

520

P SIN

∆P

DEG

GT

)

C1

P1a )

1a

Cg	=  Calculated Flow coefficient
Q	=  Flow rate from tables (SCFH)
P1a	=  Inlet pressure from table (set pressure and
	build-up) converted to absolute pressure

   G =  Specific gravity

   T =  Absolute temperature of gas at inlet degrees Rankine = °F + 460

P1	=  Absolute inlet pressure, psia = psig + 14.7
C1	=  35
∆P	=  P1 - P2, psid

Calculate the Cg coefficient for the setting and build-up nearest to the desired service conditions within the selected spring range. Then use this Cg to calculate the approximate flow available for the actual setpoint and build-up desired. Available Cg will vary based upon setpoint, differential pressure, build-up, and spring range.

Step 2.

Calculate the actual flow rate available using the coefficient from Step 1 and the actual inlet pressure

(setpoint plus build-up) and actual outlet pressure (if not atmospheric).

Equation 2:			CgP1aSIN )
				3417
QSCFH =		520				∆P	)DEG
		GT		C1		P1a

Example 1. Service Conditions:

Setpoint, 115 psi (7,9 bar) Build-up allowed, 10 psi (0,69 bar) Outlet discharges to atmosphere Require 13 200 SCFH (354 Nm3/h) air flow rate

	16 (1,1)
					BUBBLE
					POINT
	14	(0,97)																12 PSIG (0,83 bar) RELIEF
																		SETTING 500 SCFH (13,4 Nm3/h)
(bar)																		FLOW AT RELIEF SETTING
																		NPS 1/2 (DN 15) TYPE 98L
PSIG	12	(0,83)
PRESSURE,
	10.5	(0,72)
	10	(0,69)
								TIGHT
INLET	9	(0,62)						SHUTOFF
	8 (0,55)							POINT
	6	(0,41)
				500 (13,4)														1000 (26,8)				1500 (40,2)
		0
				AIR FLOW, STANDARD CUBIC FEET PER HOUR (Nm3/h)
								and								INCREASING INLET PRESSURE
A1309-1								and								DECREASING INLET PRESSURE

Figure 3. Typical Bubble Point and Reseat Point Performance

From Table 11, select NPS 3/4 or 1 (DN 20 or 25) body, red spring for 100 psi (6,9 bar) setpoint, and

10 psi (0,69 bar) build-up. The Type 98H will flow

13 000 SCFH (348 Nm3/h) air.

Calculate Cg for these table conditions using Equation 1:

P1	= 100 psig (6,9 bar) + 10 psig (0,69 bar)
	build-up = 110 psig or 124.7 psia
	(7,6 bar g or 8,6 bar a)
∆P	=  P1 - P2 = 110 psid (7,6 bar d)
Q	=  13 000 SCFH (348 Nm3/h)
C1	=  35

Answer from Equation 1, Cg = 104*

*Since build-up relates to travel, this coefficient is valid for all pressure settings on the spring used in the calculation whenever the build-up is 10 psi (0,69 bar).

Now, solve for actual flow, Q, from the original service conditions using Equation 2:

P1	=  115 psig (7,9 bar) + 10 psig (0,69 bar)
	build-up = 125 psig or 139.7 psia
	(8,6 bar or 9,6 bar a)
P2	=  0, therefore P = P1 - P2 =
	125 psig (8,6 bar) - 0 = 125 psid (8,6 bar d)
Cg	=  104 (from above)
C1	=  35

6

Bulletin 71.4:98

Answer from Equation 2, Q = 14 500 SCFH

(389 Nm3/h) rated capacity. Since this capacity is greater than the 13 200 SCFH (354 Nm3/h) required, the relief valve may be used or the calculation could be repeated to try for a smaller body size.

Example 2. Service Conditions:

Setpoint, 165 psi (11,4 bar) Build-up allowed, 10 psi (0,69 bar)

Outlet discharges into pressured system of 50 psi (3,4 bar)

Require 3000 SCFH (80,4 Nm3/h) air flow rate

From Table 11, select NPS 3/4 or 1 (DN 20 or 25) body, blue spring. For 150 psi (10,3 bar) setpoint and

10 psi (0,69 bar) build-up, the Type 98H will flow

9000 SCFH (241 Nm3/h) air.

Calculate Cg for these table conditions using Equation 1:

P1 (inlet)	=  150 psig (10,3 bar) + 10 psig
	(0,69 bar) build-up = 160 psig or
	174.7 psia (11,0 bar g or 12,0 bar a)
∆P	=  P1 - P2 = 160 psig (11,0 bar) - 0 =
160 psid (11,0 bar d)
Q	=  9000 SCFH (241 Nm3/h)
C1	=  35

Answer from Equation 1, Cg = 51.5*

*Since build-up relates to travel, this coefficient is valid for all pressure settings on the spring used in the calculation whenever the build-up is 10 psi (0,69 bar).

Now, solve for actual flow, Q, from the original service conditions using Equation 2:

P1	=  165 psig (11,4 bar) + 10 psig (0,69 bar)
	build-up = 175 psig or 189.7 psia
	(12,1 bar g or 13,1 bar a)
∆P	=  P1 - P2 = 170 psig (11,7 bar) - 50 psig
	(3,4 bar) = 120 psid (8,3 bar d)
Cg	=  51.5 (from above)
C1	=  35

Answer from Equation 2, Q = 9500 SCFH (255 Nm3/h) rated capacity. Since this capacity is greater than the 3000 SCFH (80,4 Nm3/h) required, the relief valve may be used or the calculation could be repeated to try for a smaller body size.

Liquid Sizing for Liquids Other than Water

Step 1. 

Determine Cv at build-up conditions of application.

		Cv =	Q
			∆P
Q		=  Flow in GPM from capacity tables
	∆P	=  Pressure drop in psi (setpoint and build-up)
	Cv	=  Valve sizing coefficient

Step 2. 

To determine flow rate for liquids other than water or flow rate for differential relief service:

Q = Cv ∆P/G

G = Specific gravity of fluid

Maximum Allowable Pressure Drop for Liquid Service

Pressure drops in excess of allowable will result in choked flow and possible cavitation damage.

To determine maximum allowable pressure drop for water:

∆P(allow)	=  Km (P1)
∆P	=  Valve differential - PSI
Km	=  Valve recovery coefficient from table
P1	=  Valve inlet pressure psig

To determine maximum allowable pressure drop for fluids other than water, see Fisher® Catalog 10.

7

Bulletin 71.4:98

Table 1. Trim Materials

ELASTOMER SEAT	STANDARD	OPTIONAL
Orifiice	416 Stainless steel	316 Stainless steel
O-ring retainer	416 Stainless steel	316 Stainless steel
Valve plug	416 Stainless steel	316 Stainless steel
Valve plug guide	416 Stainless steel	316 Stainless steel
Pusher post	416 Stainless steel	316 Stainless steel
Diaphragm retaining washer	316 Stainless steel	302 Stainless steel
Diaphragm	Neoprene (CR)	Fluorocarbon (FKM)(3) or Ethyleneproplylene (EPDM);
		PTFE protector available; 302 Stainless steel(2)
O-ring seat	Nitrile (NBR)	Fluorocarbon (FKM), Ethyleneproplylene EPDM, Perfluoroelastomer (FFKM)(1)
METAL SEAT	STANDARD	OPTIONAL
Orifiice	416 Stainless steel, hardened	316 Stainless steel, Hastelloy® C, Monel®
Valve plug	416 Stainless steel, hardened	316 Stainless steel, Hastelloy® C, Monel®
Valve plug guide	416 Stainless steel	316 Stainless steel, Hastelloy® C, Monel®
Pusher post	416 Stainless steel	316 Stainless steel, Hastelloy® C, Monel®
Diaphragm	302 Stainless steel(2)	Neoprene (CR), Fluorocarbon (FKM)(3), PTFE protector available , Hastelloy® C, Monel®
Diaphragm retaining washer	Not used	302 Stainless steel

    1. Available for Type 98HM only.

2. Two metal diaphragms will be used except only for Type 98L, 1/4 NPT, 2 to 7 psi (0,14 to 0,48 bar) range which uses only one metal diaphragm (see Figure 2 for assembly reference). 3. Two diaphragms will be used if elastomer diaphragm is Fluorocarbon (FKM)

Table 2. Spring Ranges for Relief or Differential Relief Pressures

	BODY SIZES,	RELIEF SET PRESSURE RANGE(1), PSIG OR PSI (bar)					SPRING PART NUMBER	SPRING COLOR
	NPS (DN)	Type 98L or 98LD	Type 98H, 98HD, or 98HM		Type 98HH or 98HHD
		2 to 7 (0,14 to 0,48 bar)	15 to 35 (1,0 to 2,4 bar)		- - - -		1E392527022	Yellow
		6 to 14 (0,41 to 0,97 bar)	25 to 75 (1,7 to 5,2 bar)		- - - -		1E392627012	Green
	1/4(2)	12 to 25 (0,83 to 1,7 bar)	70 to 140	(4,8 to 9,7 bar)	- - - -		1E392727142	Red
		20 to 38 (1,4 to 2,6 bar)	130 to 200	(9,0 to 13,8 bar)	- - - -		1L346127142	Blue
		- - - -		- - - -	150 to 375	(10,3 to 25,9)	1N942227142	Light Gray
		2 to 7 (0,14 to 0,48 bar)	15 to 35 (1,0 to 2,4 bar)		-	- - -	1E395627022	Yellow
		6 to 14 (0,41 to 0,97 bar)	25 to 75 (1,7 to 5,2 bar)		-	- - -	1D7455T0012	Green
		12 to 25 (0,83 to 1,7 bar)	70 to 140	(4,8 to 9,7 bar)	-	- - -	1E395727192	Red
	1/2 (15)	20 to 38 (1,4 to 2,6 bar)	130 to 200	(9,0 to 13,8 bar)	-	- - -	1L380027142	Blue
		- - - -	15 to 100(3) (1,0 to 6,9 bar)		-	- - -	14B9943X012	Unpainted
		- - - -	100 to 275(3) (6,9 to 19,0 bar)		-	- - -	14B9942X022	Unpainted
		- - - -		- - - -	150 to 375	(10,3 to 25,9)	1N943427142	Light Gray
		2 to 7 (0,14 to 0,48 bar)	15 to 35 (1,0 to 2,4 bar)		-	- - -	1E398927022	Yellow
		6 to 14 (0,41 to 0,97 bar)	25 to 75 (1,7 to 5,2 bar)		-	- - -	1E399027142	Green
	3/4, 1	12 to 25 (0,83 to 1,7 bar)	70 to 140	(4,8 to 9,7 bar)	- - - -		1E399127162	Red
		20 to 38 (1,4 to 2,6 bar)	130 to 200	(9,0 to 13,8 bar)	- - - -		1L380127082	Blue
	(20, 25)
		- - - -	15 to 100(3) (1,0 to 6,9 bar)		- - - -		14B9944X022	Unpainted
		- - - -	100 to 275(3) (6,9 to 19,0 bar)		- - - -		14B9945X022	Unpainted
		- - - -		- - - -	150 to 375	(10,3 to 25,9)	1N944127182	Black Stripe
		- - - -	5 to 35 (0,34 to 2,4 bar)		-	- - -	1E792327092	Dark Gray
	1-1/2, 2	- - - -	20 to 65 (1,4 to 4,5 bar)		- - - -		1E795327082	Light Blue
	(40, 50)	- - - -	50 to 100	(3,4 to 6,9 bar)	- - - -		1E795427082	Light Gray
		- - - -	80 to 170 (5,5 to 11,7 bar)		- - - -		1P788827082	Black

1. All springs may be backed off to 0 psig (0 bar). However, highest capacities and best performances are obtained by using these springs in their recommended ranges. Psi rather than psig are used for differential relief constructions.

2. Not available for Type 98HM.

3. Only available for Type 98HM. Stainless steel construction.

8

Bulletin 71.4:98

Table 3. Water Relief Capacities in Gallons per Minute (l/min), Types 98L and 98LD with Elastomer Diaphragm

NOMINAL	SPRING			RELIEF	FLOW AT		PRESSURE BUILD-UP OVER RELIEF SETTING, PSIG (bar)
					RELIEF
BODY				PRESSURE
SIZES,	Part Number		Color	SETTING,	SETTING,	2	4	6	8	10	15	20	25	30
NPS (DN)			Code	PSIG (bar)	GPM	(0,14)	(0,28)	(0,41)	(0,55)	(0,69)	(1,0)	(1,4)	(1,7)	(2,1)
					(l/min)
				2	0.7	2.1	2.6	3	3.4	3.8	4.5	5.2	5.7	6.2
	1E392527022		Yellow	(0,14)	(2,7)	(8,0)	(9,8)	(11,4)	(12,9)	(14,4)	(17,0)	(19,7)	(21,6)	(23,5)
				5	0.7	2.9	3.3	3.7	4.1	4.5	5.2	5.8	6.4	6.9
				(0,34)	(2,7)	(11,0)	(12,5)	(14,0)	(15,5)	(17,0)	(19,7)	(22,0)	(24,2)	(26,1)
	1E392627012		Green	10	2.2	3.5	4.5	5	5.3	5.5	5.9	6.5	7.0	7.5
				(0,69)	(8,3)	(13,2)	(17,0)	(18,9)	(20,1)	(20,8)	(22,3)	(24,6)	(26,5)	(28,4)
				15	1.8	3.1	4.3	5	5.5	6	6.4	6.9	7.4	7.8
				(1,0)	(6,8)	(11,7)	(16,3)	(18,9)	(20,8)	(22,7)	(24,2)	(26,1)	(28,0)	(29,5)
1/4	1E392727142		Red	20	1.8	3.3	4.8	5.7	6.1	6.3	6.7	7	7.4	7.8
				(1,4)	(6,8)	(12,5)	(18,2)	(21,6)	(23,1)	(23,8)	(25,4)	(26,5)	(28,0)	(29,5)
				25	1.8	3.5	5.3	6.1	6.5	6.7	7.1	7.5	7.9	8.3
				(1,7)	(6,8)	(13,2)	(20,1)	(23,1)	(24,6)	(25,4)	(26,9)	(28,4)	(29,9)	(31,4)
				25	1.8	3.4	4.7	5.5	6.1	6.6	7.2	7.6	8	8.4
				(1,7)	(6,8)	(12,9)	(17,8)	(20,8)	(23,1)	(25,0)	(27,3)	(28,8)	(30,3)	(31,8)
	1L346127142		Blue	30	1.8	3.8	5.2	6	6.7	7.2	7.6	8	8.4	8.5
				(2,1)	(6,8)	(14,4)	(19,7)	(22,7)	(25,4)	(27,3)	(28,8)	(30,3)	(31,8)	(32,2)
				35	1.8	4.2	5.6	6.5	7	7.4	8	8.4	8.7	9.2
				(2,4)	(6,8)	(15,9)	(21,2)	(24,6)	(26,5)	(28,0)	(30,3)	(31,8)	(32,9)	(34,8)
				2	2.2	5.2	7.5	8.5	9.5	10.2	12.1	13.8	15.3	16.6
	1E395627022		Yellow	(0,14)	(8,3)	(19,7)	(28,4)	(32,2)	(36,0)	(38,6)	(45,8)	(52,2)	(57,9)	(62,8)
				5	2.2	6	8.2	9.2	10.2	11.2	12.9	14.5	15.8	17.1
				(0,34)	(8,3)	(22,7)	(31,0)	(34,8)	(38,6)	(42,4)	(48,8)	(54,9)	(59,8)	(64,7)
	1D7455T0012		Green	10	2.2	6.7	8.5	10	11.5	12.5	14.2	15.6	16.8	18.0
				(0,69)	(8.3)	(25,4)	(32,2)	(37,9)	(43,5)	(47,3)	(53,7)	(59,0)	(63,6)	(68,1)
				15	1.8	4.5	6.7	9.2	11.2	12.6	15	16.2	17.3	18.4
				(1,0)	(6,8)	(17,0)	(25,4)	(34,8)	(42,4)	(47,7)	(56,8)	(61,3)	(65,5)	(69,6)
1/2 (15)	1E395727192		Red	20	1.8	5	7.7	10.5	12.5	13.7	16.2	17.7	18.8	19.9
				(1,4)	(6,8)	(18,9)	(29,1)	(39,7)	(47,3)	(51,9)	(61,3)	(67,0)	(71,2)	(75,3)
				25	1.8	5.5	8.2	11.5	13.2	14.5	16.5	18.2	19.5	20.4
				(1,7)	(6,8)	(20,8)	(31,0)	(43,5)	(50,0)	(54,9)	(62,5)	(68,9)	(73,8)	(77,2)
				25	1.8	4.2	7	9.7	12	13.5	16.2	18.2	19.5	20.5
				(1,7)	(6,8)	(15,9)	(26,5)	(36,7)	(45,4)	(51,1)	(61,3)	(68,9)	(73,8)	(77,6)
	1L380027142		Blue	30	1.8	4.5	7.5	10.2	12.5	14	16.7	18.7	20	21
				(2,1)	(6,8)	(17,0)	(28,4)	(38,6)	(47,3)	(53,0)	(63,2)	(70,8)	(75,7)	(79,5)
				35	1.8	4.7	8	10.7	13	14.7	17.5	19.5	21.5	21.2
				(2,4)	(6,8)	(17,8)	(30,3)	(40,5)	(49,2)	(55,6)	(66,2)	(73,8)	(81,4)	(80,2)
				2	2.2	15	18.5	20	22.5	24	28.6	32.5	36.0	39.2
	1E398927022		Yellow	(0,14)	(8,3)	(56,8)	(70,0)	(75,7)	(85,2)	(90,8)	(108)	(123)	(136)	(148)
				5	2.2	15.5	19	21	23	24.5	28.9	33.5	36.7	39.6
				(0,34)	(8,3)	(58,7)	(71,9)	(79,5)	(87,1)	(92,7)	(109)	(127)	(139)	(150)
	1E399027142		Green	10	2.2	16.5	21.5	24.5	26.5	27.5	29.5	32.3	34.9	37.3
				(0,69)	(8.3)	(62,5)	(81,4)	(92,7)	(100)	(104)	(112)	(122)	(132)	(141)
				15	1.8	14	21	25.5	28	30	32	34.6	36.9	39.2
3/4, 1				(1,0)	(6,8)	(53,0)	(79,5)	(96,5)	(106)	(114)	(121)	(131)	(140)	(148)
	1E399127162		Red	20	1.8	16.5	24	28.5	30.5	32	34	36	38.2	40.2
(20, 25)
				(1,4)	(6,8)	(62,5)	(90,8)	(108)	(115)	(121)	(129)	(136)	(145)	(152)
				25	1.8	17.5	25.5	30.5	33	34	36	38	40	42.0
				(1,7)	(6,8)	(66,2)	(96,5)	(115)	(125)	(129)	(136)	(144)	(151)	(159)
				25	1.8	10	20	25	29	32	36	38	40	42.0
				(1,7)	(6,8)	(37,9)	(75,7)	(94,6)	(110)	(121)	(136)	(144)	(151)	(159)
	1L380127082		Blue	30	1.8	11	24	30	33.5	35.5	38	40	42	44
				(2,1)	(6,8)	(41,6)	(90,8)	(114)	(127)	(134)	(144)	(151)	(159)	(167)
				35	1.8	19.5	30	34.5	36.5	38	40	42	44	51
				(2,4)	(6,8)	(73,8)	(114)	(131)	(138)	(144)	(151)	(159)	(167)	(193)

9

Bulletin 71.4:98

Table 4. Water Relief Capacities in Gallons per Minute (l/min), Types 98L and 98LD with Metal Diaphragm

NOMINAL	SPRING			RELIEF	FLOW AT		PRESSURE BUILD-UP OVER RELIEF SETTING, PSIG (bar)
					RELIEF
BODY				PRESSURE
SIZES,	Part Number		Color	SETTING,	SETTING,	2	4	6	8	10	15	20	25	30
NPS (DN)			Code	PSIG (bar)	GPM	(0,14)	(0,28)	(0,41)	(0,55)	(0,69)	(1,0)	(1,4)	(1,7)	(2,1)
					(l/min)
				2	0.7	1.2	1.8	2.5	3.0	3.3	3.9	4.5	4.9	5.4
	1E392527022		Yellow	(0,14)	(2,7)	(4,5)	(6,8)	(9,5)	(11,4)	(12,5)	(14,8)	(17,0)	(18,5)	(20,4)
				5	0.7	1.3	2.1	3.0	3.5	3.8	4.4	4.9	5.4	5.8
				(0,34)	(2,7)	(4,9)	(8,0)	(11,4)	(13,2)	(14,4)	(16,7)	(18,5)	(20,4)	(22,0)
	1E392627012		Green	10	2.2	3.4	4	4.5	4.8	5.1	5.5	6.0	6.5	7.0
				(0,69)	(8,3)	(12,9)	(15,1)	(17,0)	(18,2)	(19,3)	(20,8)	(22,7)	(24,6)	(26,5)
				15	1.8	3	3.9	4.5	5	5.4	5.8	6.3	6.7	7.1
				(1,0)	(6,8)	(11,4)	(14,8)	(17,0)	(18,9)	(20,4)	(22,0)	(23,8)	(25,4)	(26,9)
1/4	1E392727142		Red	20	1.8	3.1	4	4.6	5.2	5.5	6.3	6.7	7.1	7.5
				(1,4)	(6,8)	(11,7)	(15,1)	(17,4)	(19,7)	(20,8)	(23,8)	(25,4)	(26,9)	(28,4)
				25	1.8	3.3	4.3	5.1	5.7	6.1	6.7	7.1	7.5	7.9
				(1,7)	(6,8)	(12,5)	(16,3)	(19,3)	(21,6)	(23,1)	(25,4)	(26,9)	(28,4)	(29,9)
				25	1.8	2.6	3.7	4.5	5	5.5	6.5	7.1	7.5	7.9
				(1,7)	(6,8)	(9,8)	(14,0)	(17,0)	(18,9)	(20,8)	(24,6)	(26,9)	(28,4)	(29,9)
	1L346127142		Blue	30	1.8	3.1	4.1	4.9	5.5	6	7	7.5	7.9	8.3
				(2,1)	(6,8)	(11,7)	(15,5)	(18,5)	(20,8)	(22,7)	(26,5)	(28,4)	(29,9)	(31,4)
				35	1.8	3.2	4.4	5.3	6	6.5	7.5	7.9	8.3	8.7
				(2,4)	(6,8)	(12,1)	(16,7)	(20,1)	(22,7)	(24,6)	(28,4)	(29,9)	(31,4)	(32,9)
				2	2.2	3.7	6	7.2	8.2	9.2	11.0	12.5	13.8	15.0
	1E395627022		Yellow	(0,14)	(8,3)	(14,0)	(22,7)	(27,3)	(31,0)	(34,8)	(41,6)	(47,3)	(52,2)	(56,8)
				5	2.2	4.7	6.2	8	9.2	10.2	11.8	13.2	14.4	15.6
				(0,34)	(8,3)	(17,8)	(23,5)	(30,3)	(34,8)	(38,6)	(44,7)	(50,0)	(54,5)	(59,0)
	1D7455T0012		Green	10	2.2	3.8	5.5	7.5	9	10.5	13	14.2	15.4	16.4
				(0,69)	(8.3)	(14,4)	(20,8)	(28,4)	(34,1)	(39,7)	(49,2)	(53,7)	(58,3)	(62,1)
				15	1.8	4.2	6.2	7.5	8.7	9.7	11.5	12.4	13.3	14.1
				(1,0)	(6,8)	(15,9)	(23,5)	(28,4)	(32,9)	(36,7)	(43,5)	(46,9)	(50,3)	(53,4)
1/2 (15)	1E395727192		Red	20	1.8	4.7	7	8.5	9.7	10.7	12.7	14	14.8	15.6
				(1,4)	(6,8)	(17,8)	(26,5)	(32,2)	(36,7)	(40,5)	(48,1)	(53,0)	(56,0)	(59,0)
				25	1.8	5	7.5	9.2	10.7	12	14	15	16.2	17.0
				(1,7)	(6,8)	(18,9)	(28,4)	(34,8)	(40,5)	(45,4)	(53,0)	(56,8)	(61,3)	(64,3)
				25	1.8	3.5	5.7	7.5	9.2	10.2	12.7	14.7	16.2	17.0
				(1,7)	(6,8)	(13,2)	(21,6)	(28,4)	(34,8)	(38,6)	(48,1)	(55,6)	(61,3)	(64,3)
	1L380027142		Blue	30	1.8	4	6.5	8.5	10.1	11.2	14	16	17.2	18.2
				(2,1)	(6,8)	(15,1)	(24,6)	(32,2)	(38,2)	(42,4)	(53,0)	(60,6)	(65,1)	(68,9)
				35	1.8	4.5	7.2	9.5	11	12.2	15.5	17.2	18.2	19.2
				(2,4)	(6,8)	(17,0)	(27,3)	(36,0)	(41,6)	(46,2)	(58,7)	(65,1)	(68,9)	(72,7)
				2	2.2	13	16.5	18.5	19.5	20.5	24.4	27.8	30.8	33.5
	1E398927022		Yellow	(0,14)	(8,3)	(49,2)	(62,5)	(70,0)	(73,8)	(77,6)	(93,4)	(105)	(117)	(127)
				5	2.2	14.7	18.2	20	21	22	25.4	28.4	31.1	33.6
				(0,34)	(8,3)	(55,6)	(68,9)	(75,7)	(79,5)	(83,3)	(96,1)	(107)	(118)	(127)
	1E399027142		Green	10	2.2	11.5	17.5	20.2	20.5	24	26.5	29.0	31.4	33.5
				(0,69)	(8.3)	(43,5)	(66,2)	(76,5)	(77,6)	(90,8)	(100)	(110)	(119)	(127)
				15	1.8	5	14	18.5	21	23.5	27.5	29.7	31.7	33.7
3/4, 1				(1,0)	(6,8)	(18,9)	(53,0)	(70,0)	(79,5)	(88,9)	(104)	(112)	(120)	(128)
	1E399127162		Red	20	1.8	5.2	15	20	23.5	26	30	31.5	33.4	35.2
(20, 25)
				(1,4)	(6,8)	(19,7)	(56,8)	(75,7)	(88,9)	(98,4)	(114)	(119)	(126)	(133)
				25	1.8	5.5	18	23.5	26.5	29	32	33.5	35.5	37.2
				(1,7)	(6,8)	(20,8)	(68,1)	(88,9)	(100)	(110)	(121)	(127)	(134)	(141)
				25	1.8	2.5	7.5	12.5	17	20	26	30.5	34.5	37.2
				(1,7)	(6,8)	(9,5)	(28,4)	(47,3)	(64,3)	(75,7)	(98,4)	(115)	(131)	(141)
	1L380127082		Blue	30	1.8	3	9	14	18	22	27.5	32	37.5	39.5
				(2,1)	(6,8)	(11,4)	(34,1)	(53,0)	(68,1)	(83,3)	(104)	(121)	(142)	(150)
				35	1.8	5.2	11.5	16.5	21.5	25	31.5	36	39.5	42
				(2,4)	(6,8)	(19,7)	(43,5)	(62,5)	(81,4)	(94,6)	(119)	(136)	(150)	(159)

10

Bulletin 71.4:98

Table 5. Steam Relief Capacities in Pounds per Hour (kg/h), Types 98L and 98LD with Metal Diaphragm Only

	SPRING				FLOW AT		PRESSURE BUILD-UP OVER RELIEF SETTING, PSIG (bar)
NOMINAL				RELIEF	RELIEF
BODY			Color	PRESSURE	SETTING,	2	4	6	8	10	15	20	25	30
SIZES,	Part Number			SETTING,	POUNDS/
NPS (DN)			Code	PSIG (bar)	HOUR	(0,14)	(0,28)	(0,41)	(0,55)	(0,69)	(1,0)	(1,4)	(1,7)	(2,1)
					(kg/h)
				2	7.5	18	30	41	48	54	64	74.1	84.2	94.3
	1E392527022		Yellow	(0,14)	(3,4)	(8,2)	(13,6)	(18,6)	(21,8)	(24,5)	(29,0)	(33,6)	(33,2)	(42,8)
				5	7.5	18	33	46	54	60	70.1	80.2	90.3	100
				(0,34)	(3,4)	(8,2)	(15,0)	(20,9)	(24,5)	(27,2)	(31,8)	(36,4)	(41,0)	(45,4)
	1E392627012		Green	10	25	39	50	54	59	68	86	96.8	108	119
				(0,69)	(11,3)	(17,7)	(22,7)	(24,5)	(26,8)	(30,8)	(39,0)	(43,9)	(49,0)	(54,0)
				15	25	36	50	54	64	73	91	101	112	122
				(1,0)	(11,3)	(16,3)	(22,7)	(24,5)	(29,0)	(33,1)	(41,3)	(45,8)	(50,8)	(55,3)
1/4	1E392727142		Red	20	25	39	52	59	68	77	95	105	115	124
				(1,4)	(11,3)	(17,7)	(23,6)	(26,8)	(30,8)	(34,9)	(43,1)	(47,6)	(52,2)	(56,2)
				25	25	41	54	64	73	82	105	123	132	142
				(1,7)	(11,3)	(18,6)	(24,5)	(29,0)	(33,1)	(37,2)	(47,6)	(55,8)	(59,9)	(64,4)
				25	25	36	54	64	73	86	109	123	136	147
				(1,7)	(11,3)	(16,3)	(24,5)	(29,0)	(33,1)	(39,0)	(49,4)	(55,8)	(61,7)	(66,7)
	1L346127142		Blue	30	25	39	59	66	77	91	113	127	140	155
				(2,1)	(11,3)	(17,7)	(26,8)	(29,9)	(34,9)	(41,3)	(51,3)	(57,6)	(63,5)	(70,3)
				35	25	41	61	68	82	95	123	140	150	159
				(2,4)	(11,3)	(18,6)	(27,7)	(30,8)	(37,2)	(43,1)	(55,8)	(63,5)	(68,0)	(72,1)
				2	25	59	86	100	114	127	151	175	198	222
	1E395627022		Yellow	(0,14)	(11,3)	(26,8)	(39,0)	(45,4)	(51,7)	(57,6)	(68,5)	(79,4)	(89,8)	(101)
				5	25	73	95	114	127	136	159	182	205	228
				(0,34)	(11,3)	(33,1)	(43,1)	(51,7)	(57,6)	(61,7)	(72,1)	(82,6)	(93,0)	(103)
	1D7455T0012		Green	10	25	77	105	122	136	145	173	195	216	238
				(0,69)	(11,3)	(34,9)	(47,6)	(55,3)	(61,7)	(65,8)	(78,5)	(88,5)	(98,0)	(108)
				15	25	59	95	122	141	155	187	208	229	250
				(1,0)	(11,3)	(26,8)	(43,1)	(55,3)	(64,0)	(70,3)	(84,8)	(94,3)	(104)	(113)
1/2 (15)	1E395727192		Red	20	25	64	100	127	145	168	204	227	248	269
				(1,4)	(11,3)	(29,0)	(45,4)	(57,6)	(65,8)	(76,2)	(92,5)	(103)	(112)	(122)
				25	25	68	109	136	164	182	228	260	286	308
				(1,7)	(11,3)	(30,8)	(49,4)	(61,7)	(74,4)	(82,6)	(103)	(118)	(130)	(140)
				25	25	50	77	100	123	141	190	232	264	284
				(1,7)	(11,3)	(22,7)	(34,9)	(45,4)	(55,8)	(64,0)	(86,2)	(105)	(120)	(129)
	1L380027142		Blue	30	25	52	82	109	136	159	210	250	282	310
				(2,1)	(11,3)	(23,6)	(37,2)	(49,4)	(61,7)	(72,1)	(95,3)	(113)	(128)	(141)
				35	25	55	86	114	145	168	220	264	295	317
				(2,4)	(11,3)	(24,9)	(39,0)	(51,7)	(65,8)	(76,2)	(99,8)	(120)	(134)	(144)
				2	25	122	177	210	236	264	313	363	412	462
	1E398927022		Yellow	(0,14)	(11,3)	(55,3)	(80,3)	(95,3)	(107)	(120)	(142)	(165)	(187)	(210)
				5	25	127	182	218	246	272	318	364	415	465
				(0,34)	(11,3)	(57,6)	(82,6)	(98,9)	(112)	(123)	(144)	(165)	(188)	(211)
	1E399027142		Green	10	25	136	200	240	280	310	370	417	463	509
				(0,69)	(11,3)	(61,7)	(90,7)	(109)	(127)	(141)	(168)	(189)	(210)	(231)
				15	25	100	173	228	272	300	380	423	464	510
3/4, 1				(1,0)	(11,3)	(45,4)	(78,5)	(103)	(123)	(136)	(172)	(192)	(210)	(231)
	1E399127162		Red	20	25	127	210	264	310	246	420	455	497	538
(20, 25)
				(1,4)	(11,3)	(57,6)	(95,3)	(120)	(141)	(112)	(191)	(206)	(225)	(244)
				25	25	136	236	280	328	364	455	500	545	587
				(1,7)	(11,3)	(61,7)	(107)	(127)	(149)	(165)	(206)	(227)	(247)	(266)
				25	25	91	164	228	272	320	420	500	545	587
				(1,7)	(11,3)	(41,3)	(74,4)	(103)	(123)	(145)	(191)	(227)	(247)	(266)
	1L380127082		Blue	30	25	118	190	254	318	354	455	545	590	680
				(2,1)	(11,3)	(53,5)	(86,2)	(115)	(144)	(161)	(206)	(247)	(268)	(308)
				35	25	127	220	280	346	390	500	590	640	730
				(2,4)	(11,3)	(57,6)	(99,8)	(127)	(157)	(177)	(227)	(268)	(290)	(331)

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