Series 740 Safety Relief Valves

Series 740 thru 743
#	Description	740	741	742	743
1	Nozzle	B16 Brass	SA479-316 SS	SA479-316 SS	SA479-316 SS
2	Lock Screw	B16 Brass	B16 Brass	SA479-316 SS	SA479-316 SS
3	Lower Ring	SA351-CF8M	SA351-CF8M	SA351-CF8M	SA351-CF8M
4	Disc Holder	B16 Brass	B16 Brass	SA479-316 SS	SA479-316 SS
5	Disc Holder Shaft	B16 Brass	B16 Brass	SA479-316 SS	SA479-316 SS
6	Disc Guide	B16 Brass	B16 Brass	SA479-316 SS	SA479-316 SS
7	Bonnet	B16 Brass	B16 Brass	SA108-1117/SA216	SA351-CF8M
8	Hood Seal	PTFE	PTFE	PTFE	PTFE
9	Seal Wire	Steel / Lead	Steel / Lead	Steel / Lead	Stainless / Lead
10	Hood	B16 Brass	B16 Brass	SA108-1018	SA479-316 SS
11	Pressure Screw	B16 Brass	B16 Brass	SA479-316 SS	SA479-316 SS
12	Lock Nut	B16 Brass	B16 Brass	SA479-316 SS	SA479-316 SS
13	Spring Plate	B16 Brass	B16 Brass	SA479-316 SS	SA479-316 SS
14	Spring	302/17-7 SS	302/17-7 SS	302/17-7 SS	302/17-7 SS
15	Spring Post	B16 Brass	B16 Brass	SA479-316 SS	SA479-316 SS
16	Spring Pin	18-8 SS	18-8 SS	18-8 SS	18-8 SS
17	Guide Seals (2)	PTFE	PTFE	PTFE	PTFE
18	Disc	SA479-316 SS	SA479-316 SS	SA479-316 SS	SA479-316 SS
19	Body	B584-C84400	B584-C84400	SA216-WCB	SA351-CF8M
20	Nozzle Seal	PTFE	PTFE	PTFE	PTFE
21	Nameplate	Stainless	Stainless	Stainless	Stainless
22	Lock Screw Seal	PTFE	PTFE	PTFE	PTFE

Series 741 thru 743 Lap Joint Flange Option
#	Description	741	742	743
1	Lap Joint Nozzle	SA479-316 SS	SA479-316 SS	SA479-316 SS
29	Outlet Fitting	SA479-316 SS	SA479-316 SS	SA479-316 SS
30	Lap Joint Flange	316 Stainless	CS A-105	316 Stainless
31	Lap Joint Flange	316 Stainless	CS A-105	316 Stainless

Sizes

Series 740 thru 743 Threaded Sizes
Orifice	Flow Area In2 (mm2)		Inlet	Outlet	DN	Size I.D.	Dimensions – In. (mm)								Weight Lb (Kg)
Orifice	Flow Area In2 (mm2)		Inlet	Outlet	DN	Size I.D.	A Closed Cap		A Lift Lever		B		C		Weight Lb (Kg)
D	.125	(80.6)	1/2”	3/4”	15	C	7˗3/8"	(187)	8˗1/8"	(206)	2˗3/8"	(60)	1˗5/8"	(41)	2 (0.9)
D	.125	(80.6)	1/2”	1”	15	D	7˗3/8"	(187)	8˗1/8"	(206)	2˗3/8"	(60)	1˗5/8"	(41)	2 (0.9)
D	.125	(80.6)	3/4”	3/4”	20	E	7˗3/8"	(187)	8˗1/8"	(206)	2˗3/8"	(60)	1˗5/8"	(41)	2 (0.9)
D	.125	(80.6)	3/4”	1”	20	F	7˗3/8"	(187)	8˗1/8"	(206)	2˗3/8"	(60)	1˗5/8"	(41)	2 (0.9)
D	.125	(80.6)	1”	1”	25	G	7˗3/8"	(187)	8˗1/8"	(206)	2˗3/8"	(60)	1˗5/8"	(41)	2 (0.9)
E¹	.217	(140.0)	1/2”	1”	15	A	8˗1/8"	(206)	9"	(229)	2˗5/8"	(67)	2"	(51)	3 (1.4)
E¹	.217	(140.0)	1/2”	1-1/4”	15	B	8˗1/8"	(206)	9"	(229)	2˗5/8"	(67)	2"	(51)	3 (1.4)
E	.217	(140.0)	3/4”	1”	20	C	8˗1/8"	(206)	9"	(229)	2˗5/8"	(67)	2"	(51)	3 (1.4)
E	.217	(140.0)	3/4”	1-1/4”	20	D	8˗1/8"	(206)	9"	(229)	2˗5/8"	(67)	2"	(51)	3 (1.4)
E	.217	(140.0)	1”	1”	25	G	8˗1/8"	(206)	9"	(229)	2˗5/8"	(67)	2"	(51)	3 (1.4)
E	.217	(140.0)	1”	1-1/4”	25	F	8˗1/8"	(206)	9"	(229)	2˗5/8"	(67)	2"	(51)	3 (1.4)
E	.217	(140.0)	1-1/4”	1-1/4”	32	H	8˗1/8"	(206)	9"	(235)	2˗5/8"	(73)	2"	(51)	3 (1.4)
F	.353	(227.7)	1”	1-1/2”	25	F	9˗1/4"	(235)	9˗5/8"	(244)	2˗7/8"	(73)	2˗1/4"	(57)	5 (2.3)
F	.353	(227.7)	1-1/4”	1-1/2”	32	H	9˗1/4"	(235)	9˗5/8"	(244)	2˗7/8"	(73)	2˗1/4"	(57)	5 (2.3)
F	.353	(227.7)	1-1/2”	1-1/2”	40	G	9˗1/4"	(235)	9˗5/8"	(244)	2˗7/8"	(73)	2˗1/4"	(57)	5 (2.3)
G	.554	(357.4)	1-1/4”	2”	32	G	10˗1/4"	(260)	10˗5/8"	(270)	3˗3/8"	(86)	2˗5/8"	(67)	9 (4.1)
G	.554	(357.4)	1-1/2”	2”	40	H	10˗1/4"	(260)	10˗5/8"	(270)	3˗3/8"	(86)	2˗5/8"	(67)	9 (4.1)
G	.554	(357.4)	2”	2”	50	F	10˗1/4"	(260)	10˗5/8"	(270)	3˗3/8"	(86)	2˗5/8"	(67)	9 (4.1)
H	.923	(595.5)	1-1/2”	2”	40	F	11˗3/4"	(298)	12˗1/4"	(308)	3˗1/2"	(89)	2˗7/8"	(73)	16 (7.3)
H	.923	(595.5)	2”	2”	50	G	11˗3/4"	(298)	12˗1/4"	(308)	3˗1/2"	(89)	2˗7/8"	(73)	16 (7.3)
H	.923	(595.5)	1-1/2”	2-1/2”	40	H	11˗3/4"	(298)	12˗1/4"	(308)	3˗1/2"	(89)	2˗7/8"	(73)	16 (7.3)
H	.923	(595.5)	2”	2-1/2”	50	J	11˗3/4"	(298)	12˗1/4"	(308)	3˗1/2"	(89)	2˗7/8"	(73)	16 (7.3)
H	.923	(595.5)	2-1/2”	2-1/2”	65	K	12"	(305)	12˗1/2"	(318)	3˗3/4"	(95)	2˗7/8"	(73)	16 (7.3)
J	1.418	(914.8)	2”	3”	50	J	14˗1/4"	(362)	14˗1/2"	(368)	4"	(102)	3˗1/4"	(83)	18 (8.2)
J	1.418	(914.8)	2-1/2”	3”	65	K	14˗1/4"	(362)	14˗1/2"	(368)	4"	(102)	3˗1/4"	(83)	18 (8.2)
J	1.418	(914.8)	3”	3”	80	L	14˗1/4"	(362)	14˗1/2"	(368)	4"	(102)	3˗1/4"	(83)	18 (8.2)

¹ - 1/2" Inlet for "E" orifice is ASME/CE Air/Gas and Steam Only

Series 741 thru 743 Lap Joint Flange Sizes
Orifice	Flow Area In2 (mm2)		Inlet	Outlet	DN	Size I.D.	Dimensions – In. (mm)
							Overall Height (A)				Center to Face
							Closed Cap		Lift Lever		Inlet (B)		Outlet (C)
D	.125	(80.6)	1/2”	3/4”	15	C	9˗5/8"	(244)	10˗1/4"	(260)	4˗5/8"	(117)	4˗1/4"	(108)
D	.125	(80.6)	1/2”	1”	15	D	9-5/8"	(244)	10-1/4"	(260)	4-5/8"	(117)	4˗1/4"	(108)
D	.125	(80.6)	3/4”	3/4”	20	E	9˗5/8"	(244)	10˗1/4"	(260)	4˗5/8"	(117)	4˗1/4"	(108)
D	.125	(80.6)	3/4"	1”	20	F	9-5/8"	(244)	10-1/4"	(260)	4-5/8"	(117)	4˗1/4"	(108)
D	.125	(80.6)	1”	1”	25	G	11˗1/2"	(292)	12˗1/8"	(308)	6˗1/2"	(165)	4˗1/4"	(108)
E¹	.217	(140.0)	1/2”	1”	15	A	10˗1/4"	(260)	10˗7/8"	(276)	4˗5/8"	(117)	4˗1/4"	(108)
E¹	.217	(140.0)	1/2”	1-1/4”	15	B	10˗1/4"	(260)	10˗7/8"	(276)	4˗5/8"	(117)	4˗1/4"	(108)
E	.217	(140.0)	3/4”	1”	20	C	10˗1/4"	(260)	10˗7/8"	(276)	4˗5/8"	(117)	4˗1/4"	(108)
E	.217	(140.0)	3/4”	1-1/4”	20	D	10˗1/4"	(260)	10˗7/8"	(276)	4˗5/8"	(117)	4˗1/4"	(108)
E	.217	(140.0)	1"	1”	25	G	10˗1/4"	(260)	10˗7/8"	(276)	4˗5/8"	(117)	4˗1/4"	(108)
E	.217	(140.0)	1"	1-1/4”	25	F	10˗1/4"	(260)	10˗7/8"	(276)	4˗5/8"	(117)	4˗1/4"	(108)
E	.217	(140.0)	1-1/4"	1-1/4”	32	H	10˗1/4"	(260)	10˗7/8"	(276)	4˗5/8"	(117)	4˗1/4"	(108)
F	.353	(227.7)	1”	1-1/2”	25	F	11"	(279)	11˗5/8"	(295)	4˗5/8"	(117)	4˗5/8"	(117)
F	.353	(227.7)	1-1/4”	1-1/2”	32	H	11"	(279)	11-5/8"	(295)	4-5/8"	(117)	4˗5/8"	(117)
F	.353	(227.7)	1-1/2”	1-1/2”	40	G	11"	(279)	11-5/8"	(295)	4˗5/8"	(117)	4˗5/8"	(117)
G	.554	(357.4)	1-1/4”	2”	32	G	12˗3/8"	(314)	13"	(330)	5˗5/8"	(143)	4˗3/4"	(121)
G	.554	(357.4)	1-1/2"	2”	40	H	12-3/8"	(356)	13"	(368)	5-5/8"	(181)	4-3/4"	(121)
G	.554	(357.4)	2”	2”	50	F	14"	(356)	14˗1/2"	(368)	7˗1/8"	(181)	6˗1/2"	(165)
H	.923	(595.5)	1-1/2”	2”	40	F	14"	(356)	14˗5/8"	(371)	5˗7/8"	(149)	5˗3/8"	(137)
H	.923	(595.5)	2”	2”	50	G	14"	(356)	14˗5/8"	(371)	5˗7/8"	(149)	5˗3/8"	(137)
H	.923	(595.5)	1-1/2”	2-1/2”	40	H	14"	(356)	14˗5/8"	(371)	5˗7/8"	(149)	5˗3/8"	(137)
H	.923	(595.5)	2”	2-1/2”	50	J	14"	(356)	14˗5/8"	(371)	5˗7/8"	(149)	5˗3/8"	(137)
H	.923	(595.5)	2-1/2”	2-1/2”	65	K	14"	(356)	14˗5/8"	(371)	5˗7/8"	(149)	5˗3/8"	(137)
J	1.418	(914.8)	2”	3”	50	J	16˗5/8"	(422)	17˗1/8"	(435)	6˗1/2"	(165)	6"	(152)
J	1.418	(914.8)	2-1/2”	3”	65	K	16-5/8"	(422)	17˗1/8"	(435)	6-1/2"	(165)	6"	(165)
J	1.418	(914.8)	2”	3”	80	J	16˗5/8"	(422)	17˗1/8"	(435)	6˗1/2"	(165)	6"	(152)

¹ - 1/2" Inlet for "E" orifice is ASME/CE Air/Gas and Steam Only

Pressure - Temperature

Series	Inlet Sizes	Metals¹	Min. Temp °F (°C)		Max. Temp^4,5 °F (°C)		Max Pressure^2,3 psig (barg)		Services	Certifications
740	1/2” to 3”	Brass/Bronze	-320°	-(196°)	406°	(208°)	350	(24.1)	Air / Gas / Steam / Liquid	ASME VIII, CE, CRN
741	1/2” to 3”	Stainless/Bronze	-320°	-(196°)	425°	(218°)	1500	(103.4)	Air / Gas / Steam / Liquid	ASME VIII, CE, CRN
742	1/2” to 3”	Stainless/Carbon	-20°	-(29°)	800°	(218°)	1500	(103.4)	Air / Gas / Steam / Liquid	ASME VIII, CE, CRN
743	1/2” to 3”	Stainless	-320°	-(196°)	800°	(218°)	1500	(103.4)	Air / Gas / Steam / Liquid	ASME VIII, CE, CRN
744	1/2” to 3”	Monel/Bronze	-320°	-(29°)	800°	(218°)	1500	(103.4)	Air / Gas / Steam / Liquid	ASME VIII, CE, CRN
745	1/2” to 3”	Monel/Carbon	-320°	-(196°)	800°	(218°)	1500	(103.4)	Air / Gas / Steam / Liquid	ASME VIII, CE, CRN
746	1/2” to 3”	Monel/Stainless	-320°	-(29°)	800°	(218°)	1500	(103.4)	Air / Gas / Steam / Liquid	ASME VIII, CE, CRN
747	1/2” to 3”	No-Lead/No-Lead	-320°	-(196°)	406°	(218°)	350	(103.4)	Air / Gas / Steam / Liquid	Non-Code
748	1/2” to 3”	Stainless/No-Lead	-320°	-(29°)	425°	(218°)	1500	(103.4)	Air / Gas / Steam / Liquid	Non-Code

¹ Other metal options available, contact Aquatrol.
² Maximum set pressure for steam service is 300 psig (20.7 barg)
³ Maximum set pressure for steam on Series 740 is 250 psig (17.2 barg)
⁴ Maximum temperatures depend upon seating material.
⁵ For temps over 425°F (218°C) contact Aquatrol. (Inconel spring used temperatures above 650°F)

Seating

O-Ring Seating
#	Description	740	741	742	743
1	Nozzle	B16 Brass	SA479-316 SS	SA479-316 SS	SA479-316 SS
3	Lower Ring	SA351-CF8M	SA351-CF8M	SA351-CF8M	SA351-CF8M
4	Disc Holder	B16 Brass	B16 Brass	SA479-316 SS	SA479-316 SS
6	Disc Holder Shaft	B16 Brass	B16 Brass	SA479-316 SS	SA479-316 SS
25	O-Ring Disc	SA479-316 SS	SA479-316 SS	SA479-316 SS	SA479-316 SS
26	Screw	18-8 SS	18-8 SS	18-8 SS	18-8 SS
27	Disc Insert	SA479-316 SS	SA479-316 SS	SA479-316 SS	SA479-316 SS
28	O-Ring	Various	Various	Various	Various

PTFE Seating
#	Description	740	741	742	743
1	Nozzle	B16 Brass	SA479-316 SS	SA479-316 SS	SA479-316 SS
3	Lower Ring	SA351-CF8M	SA351-CF8M	SA351-CF8M	SA351-CF8M
4	Disc Holder	B16 Brass	B16 Brass	SA479-316 SS	SA479-316 SS
6	Disc Holder Shaft	B16 Brass	B16 Brass	SA479-316 SS	SA479-316 SS
24	Disc	PTFE	PTFE	PTFE	PTFE

Seating Materials
Material	Names	Min Temp °F (°C)		Max Temp °F (°C)		Use for:
FKM	Viton-A	-13°	-(25°)	446°	(230°)	Acetone, Air, Alcohol, Benzine, Butane, Ethylene, Ethylene Glycol, Ethyl Alcohol, Gasoline, Isobutyl Alcohol, Kerosene, Lube Oil, Natural Gas, Naphtha, Nitrogen, Propane, Water, Xylene
Nitrile	Buna-N	-40°	-(40°)	250°	(121°)	Air, Butane, Carbon Dioxide, Diesel Oil, Ethyl Chloride, Ethyl Ether, Fuel Oil, Gasoline, Helium, Hydrogen Sulphide, Kerosene, Natural Gas, Nitrogen, Oxygen (Gas), Propane
EPDM		-40°	-(40°)	303°	(151°)	Steam, Water, Hot Water, Acetone, Beer, Brake Fluid, Hydrogen Gas, Sulfur Dioxide, Acids, Alkalies
FFKM	Markez®	5°	-(15°)	500°	(260°)	Aromatic Hydrocarbons, Chlorinated Hydrocarbons, Polar Solvents (ketones, esters, ethers), Inorganic and Organic Acids, Water, and Steam (Steam service up to 380°F (193°C) saturated)
FFKM	Kalrez®	-10°	-(23°)	550°	(288°)
PTFE		-320°	-(196°)	450°	(232°)	Cryogenic Service including Argon, Carbon Dioxide, Helium, Hydrogen, Nitrogen, Oxygen, Steam
PCTFE	Kel-F®	-320°	-(196°)	245°	(118°)	Cryogenic Service including Argon, Carbon Dioxide, Helium, Hydrogen, Nitrogen, Oxygen, Steam
Silicone		-75°	-(60°)	400°	(204°)	Air, Helium, Nitrogen, Oxygen (Gas)
Note: For more information on o-ring materials, visit: Marco Rubber O-Ring Comparison Apple Rubber Selection Guide

Ordering

Series 740 thru 748 - Threaded Inlet – Part Numbers

740

125

Series

Description

Orifice/Size ID

Connection

Seating

Cap

Service

Options

Set

740

Brass/Bronze

DC-

1/2” x 3/4”

NPT MxF

M-

Metal

Lift lever

K-

ASME VIII-Air/gas

None

Ex.125

741

316 SS/Bronze

DD-

1/2” x 1”

NPT FxF

P-

PTFE

Closed cap

L-

ASME VIII-Steam

Chrome
Plating

742

316 SS/Carbon

DE-

3/4” x 3/4”

BSPT MxF

B-

Buna

Packed lift lever

J-

ASME VIII-Liquid

743

316 Stainless

DF-

3/4” x 1”

BSPT FxF

V-

Viton

Lift Lever with
Anti-Vibe Spring

P-

CE - Air/gas

O2 Cleaned

744

Monel/Bronze

DG-

1” x 1”

BSPP MxF

E-

EPDM

E-

CE - Steam

API Seating

745

Monel/Carbon

EA²-

1/2” x 1”

BSPP FxF

K-

Kalrez

Closed Cap
with Test Gag

D-

CE - Liquid

O2 Clean /
API Seating

746

Monel/316 SS

EB²-

1/2” x 1-1/4”

Z-

Markez

N-

Non-code Air/Gas

747¹

No-Lead/No-Lead

EC-

3/4” x 1”

C-

PCTFE

Packed Lever
with Test Gag

T-

Non-code Steam

O2 Clean /
Chrome

748¹

316 SS/No-Lead

ED-

3/4” x 1-1/4”

S-

Silicone

U-

Non-code Liquid

EG-

1” x 1”

A-

Open Lever
with Test Gag

O2 / API / Chrome

EF-

1” x 1-1/4”

Note:
This chart is
for threaded
inlets only.

EH-

1-1/4” x 1-1/4”

API / Chrome

FF-

1” x 1-1/2”

High-Temp

FH-

1-1/4” x 1-1/2”

FG-

1-1/2” x 1-1/2”

GG-

1-1/4” x 2”

GH-

1-1/2” x 2”

GF-

2” x 2”

HF-

1-1/2” x 2”

HG-

2” x 2”

HH-

1-1/2” x 2-1/2”

1 - No-Lead is non-code and
available for D,E,F Orifice
non-code Only
² - 1/2" Inlet for "E" orifice is
ASME/CE Air/Gas, Steam Only
³ - BSPP Outlet is available for
740 and 741 Series Only

HJ-

2” x 2-1/2”

HK-

2-1/2” x 2-1/2”

JJ-

2” x 3”

JK-

2-1/2” x 3”

JL-

3” x 3”

Series 740 thru 743 and 748 - Tri-Clamp Inlet – Part Numbers

743

125

Series

Description

Orifice/Size ID

Connection

Seating

Cap

Service

Options

Set

741

316 SS/Bronze

DE-

3/4” x 3/4”

Tri-Clamp x NPT

M-

Metal

Lift lever

K-

ASME VIII - Air/gas

None

Ex.125

742

316 SS/Carbon

DF-

3/4” x 1”

P-

PTFE

Closed cap

L-

ASME VIII - Steam

Chrome
Plating

743

316 Stainless

DH-

1” x 3/4”

Tri-clamp x BSPT

B-

Buna

Packed lift lever

J-

ASME VIII - Liquid

748¹

316 SS/Carbon

DG-

1” x 1”

V-

Viton

Lift Lever with
Anti-Vibe Spring

P-

CE - Air/gas

O2 Cleaned

EC-

3/4” x 1”

E-

EPDM

E-

CE - Steam

API Seating

ED-

3/4" x 1-1/4"

K-

Kalrez

Closed Cap
with Test Gag

D-

CE - Liquid

O2 Clean /
API Seating

Note:
This chart is
for Tri-Clamp
inlets only

EG-

1” x 1”

Z-

Markez

N-

Non-code Air/gas

EF-

1” x 1-1/4”

C-

PCTFE

Packed Lever
with Test Gag

T-

Non-code Steam

O2 Clean /
Chrome

EJ-

1-1/2” x 1”

S-

Silicone

U-

Non-code Liquid

EK-

1-1/2” x 1-1/4”

A-

Open Lever
with Test Gag

O2 / API / Chrome

FF-

1” x 1-1/2”

FG-

1-1/2” x 1-1/2”

API / Chrome

GH-

1-1/2” x 2”

High-Temp

GF-

2” x 2”

HF-

1-1/2” x 2”

HG-

2” x 2”

HH-

1-1/2” x 2-1/2”

HJ-

2” x 2-1/2”

HK-

2-1/2” x 2-1/2”

JJ-

2” x 3”

¹ - No-Lead is non-code and
available for D,E,F Orifice,
non-code Only

JK-

2-1/2” x 3”

JL-

3” x 3”

Series 741 and 746 and 748 – Lap Joint Flange – Part Numbers

742

125

Series

Descr.

Orifice/Size ID

Connection

Seating

Cap

Service

Options

Face Finish

Set

741

316 SS/ Bronze

DC-

1/2” x 3/4”

A-

150# x 150#

M-

Metal

Lift lever

K-

ASME VIII-Air/gas

None

A-

Serrated x
Serrated

Ex.125

742

316 SS/Carbon

DD-

1/2” x 1”

B-

300# x 150#

P-

PTFE

Closed cap

L-

ASME VIII-Steam

Chrome Plating

743

316 S.S.

DE-

3/4” x 1”

C-

600# x 150#

B-

Buna

Packed lift lever

J-

ASME VIII-Liquid

B-

Flat x
Serrated

744

Monel/Bronze

DF-

3/4” x 1”

D-

900# x 150#

V-

Viton

Lift Lever with
Anti-Vibe Spring

P-

CE - Air/gas

O2 Cleaned

745

Monel/Carbon

DG-

1” x 1”

E-

150# x FNPT

E-

EPDM

E-

CE - Steam

API Seating

C-

Smooth x
Smooth

746

Monel/316 SS

EA²-

1/2” x 1”

F-

300# x FNPT

K-

Kalrez

Closed Cap
with Test Gag

D-

CE - Liquid

O2 Clean /
API Seating

748¹

316 SS/No-Lead

EB²-

1/2” x 1-1/4”

G-

600# x FNPT

Z-

Markez

N-

Non-code Air/gas

D-

Serrated x
Flat

EC-

3/4" x 1"

H-

900# x FNPT

C-

PCTFE

Packed Lever
with Test Gag

T-

Non-code Steam

O2 Clean /
Chrome

ED-

3/4" x 1-1/4"

J-

300# x 300#

S-

Silicone

U-

Non-code Liquid

Note:
This chart is
for flanged
inlets only

EG-

1” x 1”

K-

600# x 600#

A-

Open Lever
with Test Gag

O2 / API /
Chrome

EF-

1” x 1-1/4”

L-

900# x 900#

EH-

1-1/4” x 1-1/4”

M-

150# x FBSPT

API / Chrome

FF-

1” x 1-1/2”

N-

300# x FBSPT

High-Temp

FH-

1-1/4” x 1-1/2”

P-

600# x FBSPT

FG-

1-1/2” x 1-1/2”

R-

900# x FBSPT

GG-

1-1/4” x 2”

S-

600# x 300#

GH-

1-1/2” x 2”

T-

900# x 300#

GF-

2” x 2”

HF-

1-1/2” x 2”

HG-

2” x 2”

HH-

1-1/2” x 2-1/2”

HJ-

2” x 2-1/2”

HK-

2-1/2” x 2-1/2”

¹ - No-Lead is non-code and
available for D,E,F Orifice,
non-code only
² - 1/2" Inlet for "E" orifice is
ASME/CE Air/Gas, Steam Only

JJ-

2” x 3”

JK-

2-1/2” x 3”

JL-

3” x 3”

Capacities

LIQUID

Series 740 thru 748 Capacities Liquid GPM – ASME Section VIII							Series 740 thru 748 Capacities Liquid LPM – ASME Section VIII
Set psig	Orifice area in^2 Flow Coefficient = .791						Set barg	Orifice area mm^2 Flow Coefficient = .791
	“D”	“E”	“F”	“G”	“H”	“J”		“D”	“E”	“F”	“G”	“H”	“J”
	.126	.217	.353	.554	.923	1.418		81.3	140.0	227.7	357.4	595.5	914.8
5	11	18	30	47	78	121	0.2	35	60	98	153	255	392
10	14	24	38	60	100	154	0.5	46	79	129	202	336	517
15	16	28	45	71	118	181	1	60	103	168	264	439	675
20	18	31	51	80	133	204	2	81	140	227	357	594	913
25	20	35	56	88	147	226	3	99	171	278	436	726	1116
30	22	37	61	96	159	245	4	115	197	321	503	839	1289
35	23	40	66	103	172	264	5	128	220	359	563	938	1441
40	25	43	70	110	184	283	6	140	242	393	617	1027	1578
45	27	46	75	117	195	300	7	151	261	424	666	1110	1705
50	28	48	79	123	206	316	8	162	279	454	712	1186	1822
55	29	51	83	130	216	332	9	172	296	481	755	1258	1933
60	31	53	86	135	225	346	10	181	312	507	796	1326	2038
65	32	55	90	141	235	360	11	190	327	532	835	1391	2137
70	33	57	93	146	243	374	12	198	342	556	872	1453	2232
75	34	59	96	151	252	387	13	206	356	578	908	1512	2323
80	36	61	100	156	260	400	14	214	369	600	942	1569	2411
85	37	63	103	161	268	412	15	222	382	621	975	1624	2496
90	38	65	106	166	276	424	16	229	394	642	1007	1678	2577
95	39	67	108	170	284	436	17	236	407	661	1038	1729	2657
100	40	68	111	175	291	447	18	243	418	681	1068	1779	2734
125	44	76	124	195	325	500	19	250	430	699	1097	1828	2809
150	49	84	136	214	356	547	20	256	441	717	1126	1876	2882
175	53	90	147	231	385	591	22	269	462	752	1181	1967	3022
200	56	97	157	247	411	632	24	280	483	786	1233	2055	3157
225	60	103	167	262	436	671	26	292	503	818	1284	2139	3286
250	63	108	176	276	460	707	30	314	540	879	1379	2297	3529
300	69	118	193	302	504	774	35	339	583	949	1489	2481	3812
350	74	128	208	327	544	836	40	362	624	1014	1592	2653	4075
400	79	137	223	349	582	894	41.38	368	634	1032	1619	2698	4145
450	84	145	236	370	617	948	45	384	661	1076	1689
500	89	153	249	391	651	1000	48.27	398	685	1114	1749
550	93	160	261	410	682	1048	51.72	412	709	1154
600	97	168	273	428	713	1095	60	443	764
650	101	174	284	445			70	479	825
700	105	181	294	462			80	512	882
750	109	187	305				90	543	935
800	112	193					103.42	582	1003
850	116	199
900	119	205
950	122	211
1000	126	216
1100	132	227
1200	138	237
1300	143	247
1400	149	256
1500	154	265
Set pressures not limited to this chart. Specify when ordering. Capacities are at 3 psig or 10% (whichever is greater) over set pressure. Set pressures below 15 psig (1.03 barg) are NON-Code. Maximum back-pressure is 10% of set pressure or 50 psig (3.45 barg) whichever is less. Lifting Device as required by the ASME, ASME Section VIII: UG136(3) Each pressure relief valve on air, water at the valve inlet that exceeds 140°F (60°C), excluding over-pressure or relief events, or steam service shall have a substantial lifting device which when activated will release the seating force on the disc when the pressure relief valve is subjected to a pressure of at least 75% of the set pressure of the valve.

AIR / GAS

Series 740 thru 748 Capacities Air SCFM – ASME Section VIII							Series 740 thru 748 Capacities Air Nm3/hr – ASME Section VIII
Set psig	Orifice area in^2 Flow Coefficient = .878						Set barg	Orifice area mm^2 Flow Coefficient = .878
	“D”	“E”	“F”	“G”	“H”	“J”		“D”	“E”	“F”	“G”	“H”	“J”
	.126	.217	.353	.554	.923	1.418		81.3	140.0	227.7	357.4	595.5	914.8
5	46	79	129	202	337	518	0.2	71	122	199	312	520	799
10	56	97	157	247	411	632	0.5	86	148	241	378	630	967
15	66	114	186	292	486	746	1	111	191	311	488	813	1248
20	76	132	214	336	560	860	2	161	277	451	707	1179	1811
25	87	149	243	381	634	975	3	215	371	604	948	1579	2425
30	97	167	271	425	709	1089	4	270	466	758	1189	1981	3044
35	108	186	302	474	790	1214	5	325	560	912	1431	2384	3662
40	119	205	333	523	872	1340	6	380	655	1066	1672	2786	4280
45	130	224	365	572	954	1465	7	435	750	1220	1914	3189	4899
50	141	243	396	621	1035	1591	8	490	844	1373	2156	3591	5517
55	152	263	427	671	1117	1716	9	545	939	1527	2397	3994	6136
60	164	282	458	720	1199	1842	10	600	1034	1681	2639	4396	6754
65	175	301	490	769	1281	1967	11	655	1128	1835	2880	4799	7373
70	186	320	521	818	1362	2093	12	710	1223	1989	3122	5201	7991
75	197	339	552	867	1444	2218	13	765	1318	2143	3364	5604	8609
80	208	359	583	916	1526	2344	14	820	1412	2297	3605	6007	9228
85	219	378	615	965	1607	2469	15	875	1507	2451	3847	6409	9846
90	231	397	646	1014	1689	2595	16	930	1601	2605	4088	6812	10465
95	242	416	677	1063	1771	2720	17	985	1696	2759	4330	7214	11083
100	253	436	708	1112	1852	2846	18	1040	1791	2913	4572	7617	11702
125	309	532	865	1357	2261	3474	19	1095	1885	3067	4813	8019	12320
150	364	628	1021	1602	2670	4101	20	1150	1980	3221	5055	8422	12938
175	420	724	1177	1847	3078	4729	22	1260	2169	3529	5538	9227	14175
200	476	820	1333	2093	3487	5356	24	1369	2359	3837	6021	10032	15412
225	532	916	1490	2338	3895	5984	26	1479	2548	4145	6505	10837	16649
250	587	1012	1646	2583	4304	6612	30	1699	2926	4760	7471	12447	19123
300	699	1204	1958	3073	5121	7867	35	1974	3400	5530	8679	14460	22215
350	811	1396	2271	3564	5938	9122	40	2249	3873	6300	9887	16473	25307
400	922	1588	2583	4054	6755	10377	41.38	2325	4003	6512	10221	17028	26160
450	1034	1780	2896	4545	7572	11632	45	2523	4346	7070	11095
500	1145	1972	3208	5035	8389	12888	48.27	2703	4655	7573	11885
550	1257	2164	3521	5526	9206	14143	51.72	2893	4982	8104
600	1368	2356	3833	6016	10023	15398	60	3348	5766
650	1480	2549	4146	6506			70	3897	6712
700	1591	2741	4458	6997			80	4447	7658
750	1703	2933	4771				90	4996	8605
800	1814	3125					103.42	5734	9875
850	1926	3317
900	2037	3509
950	2149	3701
1000	2261	3893
1100	2484	4277
1200	2707	4661
1300	2930	5046
1400	3153	5430
1500	3376	5814
Set pressures not limited to this chart. Specify when ordering. Capacities are at 3 psig or 10% (whichever is greater) over set pressure. Set pressures below 15 psig (1.03 barg) are NON-Code. Maximum back-pressure is 10% of set pressure or 50 psig (3.45 barg) whichever is less. Lifting Device as required by the ASME, ASME Section VIII: UG136(3) Each pressure relief valve on air, water at the valve inlet that exceeds 140°F (60°C), excluding over-pressure or relief events, or steam service shall have a substantial lifting device which when activated will release the seating force on the disc when the pressure relief valve is subjected to a pressure of at least 75% of the set pressure of the valve.

STEAM

Series 740 thru 748 Capacities Steam Lbs/hr – ASME Section VIII							Series 740 thru 748 Capacities Steam Kg/hr – ASME Section VIII
Set psig	Orifice area in^2 Flow Coefficient = .878						Set barg	Orifice area mm^2 Flow Coefficient = .878
	“D”	“E”	“F”	“G”	“H”	“J”		“D”	“E”	“F”	“G”	“H��	“J”
	.126	.217	.353	.554	.923	1.418		81.3	140.0	227.7	357.4	595.5	914.8
5	129	223	362	569	947	1455	0.2	53	92	149	234	390	599
10	158	272	442	694	1156	1776	0.5	64	111	181	284	472	726
15	186	321	522	819	1365	2097	1	83	143	233	366	610	936
20	215	370	602	944	1573	2417	2	121	208	338	531	884	1358
25	243	419	682	1070	1782	2738	3	162	278	453	711	1184	1819
30	272	468	761	1195	1991	3058	4	203	349	568	892	1486	2283
35	303	522	849	1333	2220	3411	5	244	420	684	1073	1788	2747
40	334	576	937	1470	2450	3764	6	285	491	799	1254	2090	3211
45	366	630	1025	1608	2679	4116	7	327	562	915	1436	2392	3675
50	397	684	1113	1746	2909	4469	8	368	633	1030	1617	2694	4139
55	428	738	1200	1884	3138	4822	9	409	704	1146	1798	2996	4603
60	460	792	1288	2022	3368	5174	10	450	775	1261	1979	3298	5066
65	491	846	1376	2159	3598	5527	11	491	846	1377	2161	3600	5530
70	522	900	1464	2297	3827	5880	12	533	917	1492	2342	3902	5994
75	554	954	1551	2435	4057	6232	13	574	988	1608	2523	4204	6458
80	585	1008	1639	2573	4286	6585	14	615	1059	1723	2704	4506	6922
85	616	1062	1727	2710	4516	6938	15	656	1130	1839	2886	4808	7386
90	648	1116	1815	2848	4745	7290	16	698	1201	1954	3067	5110	7850
95	679	1170	1903	2986	4975	7643	17	739	1272	2070	3248	5411	8314
100	710	1224	1990	3124	5204	7995	18	780	1343	2185	3429	5713	8777
125	867	1493	2429	3813	6352	9759	19	821	1414	2301	3611	6015	9241
150	1024	1763	2868	4502	7500	11522	20	862	1485	2416	3792	6317	9705
175	1180	2033	3307	5190	8648	13285	20.7	891	1535	2497	3919	6529	10030
200	1337	2303	3746	5879	9795	15048
225	1494	2573	4185	6568	10943	16812
250	1651	2843	4624	7257	12091	18575
275	1807	3112	5063	7946	13238	20338
300	1964	3382	5502	8635	14386	22101
Set pressures not limited to this chart. Specify when ordering. Capacities are at 3 psig or 10% (whichever is greater) over set pressure. Set pressures below 15 psig (1.03 barg) are NON-Code. Maximum back-pressure is 10% of set pressure or 50 psig (3.45 barg) whichever is less. Series 740 maximum set pressure on steam is 250 psig (17.2 barg) Lifting Device as required by the ASME, ASME Section VIII: UG136(3) Each pressure relief valve on air, water at the valve inlet that exceeds 140°F (60°C), excluding over-pressure or relief events, or steam service shall have a substantial lifting device which when activated will release the seating force on the disc when the pressure relief valve is subjected to a pressure of at least 75% of the set pressure of the valve.

Safety Valve - Relief Valve - Safety Relief Valve 800.323.0688

800.323.0688

Series 740 Safety Relief Valves