www.swagelok.com
Proportional Safety Relief Valves
PRV Se ries
■
Gas and liquid service
■
Working pressure: 6000 psig (413 bar)
■
Set pressures from 145 to 6000 psig (10.0 to 413 bar)
■
All 316L stainless steel construction
■
1/4 through 1 in. NPT and ISO/BSP parallel thread end connections
■
Certified to PED 2014/68/EU Category IV
2 PRV Series Proportional Safety Relief Valves
Features
■
All 316L stainless steel wetted metal components
■
Five set spring pressure ranges
■
Factory-set, tested, locked, and tagged with the set
pressure
■
CE-marked in accordance with the Pressure Equipment
Directive as a safety valve according to ISO-4126-1
■
Available integral end connections—1/4 and 3/4 in. female
NPT and ISO/BSP parallel thread
■
Available end connection adapters—1/2 in. male and female
NPT and ISO/BSP parallel thread, 3/4 in. male NPT, and
1in. male and female NPT and ISO/BSP parallel thread end
connections
O-ring
seals around poppet
during relief mode.
Poppet
seals bubble-tight against seat
seal for accurate resealing.
Lock wire capability
secures cover to maintain
set pressure adjustment.
Seat seal
provides elastomer-to-metal
seal for positive shutoff.
Set screw
provides easy external
set pressure adjustment.
Spring
adjusts to provide
desired set pressure.
Cover
protects set screw.
Applications
PRV series relief valves are proportional safety relief valves
that open gradually as the pressure increases above the set
pressure.
• Swagelok
®
proportional relief valves should never be
used as safety relief devices in steam applications
such as ASME Boiler and Pressure Vessel Code
Section I, Power Boilers.
Operation
PRV series relief valves OPEN when system pressure reaches
the set pressure, and CLOSE when system pressure falls
below the set pressure.
• For valves not actuated for a period of time, initial
relief pressure may be different than the set
pressure.
Seat ring
contains the seat seal
during pressurization.
Seat
■
316L stainless steel
■
provides positive shutoff for poppet.
PRV Series Proportional Safety Relief Valves 3
Valve Series PRV2 PRV6
Working Pressure, psig (bar) 6000 (413)
Set Pressure, psig (bar)
145 to 5290
(10.0 to 365)
145 to 6000
(10.0 to 413)
Temperature, °F (°C)
Fluorocarbon FKM seal material:
5 to 176 (–15 to 80)
Nitrile seal material:
–4 to 176 (–20 to 80)
Seal Materials Fluorocarbon FKM and nitrile
Flow Coefficient (C
v
) 0.49 4.36
Seat Diameter, in. (mm) 0.20 (5.0) 0.45 (11.5)
Weight, lb (kg) 1.7 (0.77) 5.7 (2.6)
Set Pressure and Resealing Pressure
■
Set pressure is the upstream pressure at which the rst
indication of ow occurs. Set pressure of each valve after
initial relief is repeatable within ± 5 % at room temperature.
■
Resealing pressure is the upstream pressure at which there
is no indication of ow. Resealing pressure is always lower
than set pressure. See table below for details.
■
Blowdown is the difference between the set pressure
and the resealing pressure. It is usually expressed as a
percentage of the set pressure.
Set Pressure
psig (bar)
Minimum Resealing
Pressure as a Percentage
of Set Pressure, %
2900 (200) 95
1450 (100) 90
724 (50.0) 85
362 (25.0) 80
Technical Data
Testing
Every PRV series proportional safety relief valve is tested for
shell, set, and resealing performance.
Cleaning and Packaging
All Swagelok PRV series proportional safety relief valves are
cleaned and packaged in accordance with Standard Cleaning
and Packaging (SC-10), MS-06-62.
4 PRV Series Proportional Safety Relief Valves
Materials of Construction
Wetted components listed in italics.
Component
Material Grade /
ASTM Specification
1 Cover 316L SS / A479, EN10088
2 Set screw A2-70
3 Nut A2
4 Spring housing 316L SS / A479
5 Ball 420 stainless steel
6 Spring guide 316L SS / A479
7 Set spring CR50V4
8 Poppet 316L SS / A479, EN10088
9 Bearing Carbon- and PTFE-filled polyamide
10 Backup ring (PRV2 only) PTFE
11 O-ring
Nitrile, fluorocarbon FKM
12 O-ring
13 Poppet housing
316L SS / A479, EN10088
14 Seat ring
15 Seat seal
Nitrile, fluorocarbon FKM
16 O-ring
17 Seat
316L SS / A479, EN10088
18 Seat housing (PRV6 only)
19 Body
20 Adapters (PRV6 only)
Lubricants
Molybdenum disulfide-based dry
film and paste; silicone-based
PRV6 Series Relief Valve
PRV2 Series Relief Valve
1
2
3
4
5
7
17
19
6
8
10
11
12
13
14
15
16
9
1
2
3
4
5
7
13
6
8
9
14
11
16
20
19
12
18
17
12
15
PRV Series Proportional Safety Relief Valves 5
Flow Data at 70°F (20°C)
Certified Discharge Coefficient
Set Pressure
Range
psig (bar)
Certified Discharge Coefficient (K
dr
)
PRV2 Series PRV4/6/8 Series
Gas Liquid Gas Liquid
145 to 580
(10.0 to 40.0)
0.035 0.032 0.027 0.050
580 to 1160
(40.0 to 80.0)
1160 to 2175
(80.0 to 150)
2175 to 4060
(150 to 280)
0.070 0.032 0.027 0.036
4060 to 5290
(280 to 365)
5290 to 6000
(365 to 413)
— —
0.027 0.036
Set Pressure—0 to 750 psig (0 to 50 bar)
JPN
EURO
USA
050 200150100 250 300
050 200150100 250 300
0
125
250
375
500
625
750
10
30
40
50
0
0
125
250
375
500
625
750
10
30
40
50
0
4000
2000
6000
0
8000
075 225150 300 375
0
75
225150 300 375
450
450
20
20
1.0
3.0
4.0
2.0
5.0
0
Air Flow, Nm
3
/h
Inlet Pressure, bar
Inlet Pressure, psig
Air Flow, std ft
3
/min
Set Pressure—1000 to 3000 psig (70 to 200 bar)
JPN
EURO
USA
0
100
400300200 500 600
0 100 400300200 500 600
0
500
1000
1500
2000
2500
3000
40
120
160
200
0
0
500
1000
1500
2000
2500
3000
40
120
160
200
0
80004000 12 000
0
0 16 000
0 150 450300 600 750
0
150
450300 600 750
900
900
80
80
4.0
12
16
8.0
20
Air Flow, Nm
3
/h
Inlet Pressure, bar
Inlet Pressure, psig
Air Flow, std ft
3
/min
Set Pressure—3000 to 6000 psig (200 to 413 bar)
JPN
EURO
USA
3000
3500
4000
4500
5000
5500
6000
250
300
350
400
0 150 450300 600 750 900
3000
3500
4000
4500
5000
5500
6000
250
300
350
400
0 150 450300 600 750 900
25
30
35
40
0 100
400300200 500 600
0 100 400300200 500 600
3000 90006000 12 0000 15 000
Air Flow, Nm
3
/h
Inlet Pressure, bar
Inlet Pressure, psig
Air Flow, std ft
3
/min
Set Pressure—0 to 2175 psig (0 to 150 bar)
JPN
EURO
USA
0
100
400300200 500 600
0 100 400300200 500 600
0
500
1000
1500
2000
2500
3000
50
100
150
200
0
0
500
1000
1500
2000
2500
3000
50
100
150
200
0
3000 90006000 12 000
5.0
10
15
20
0
0 15 000
0 150 450300 600 750
0
150
450300 600 750
900
900
Air Flow, Nm
3
/h
Inlet Pressure, bar
Inlet Pressure, psig
Air Flow, std ft
3
/min
Set Pressure—2175 to 5290 psig (150 to 365 bar)
JPN
EURO
USA
0
100
400300200 500 600
0 100 400300200 500 600
0
1000
2000
3000
4000
5000
6000
100
200
300
400
0
0
1000
2000
3000
4000
5000
6000
100
200
300
400
0
3000 90006000 12 000
10
20
30
40
0
0 15 000
0 150 450300 600 750
0
150
450300 600 750
900
900
Air Flow, Nm
3
/h
Inlet Pressure, bar
Inlet Pressure, psig
Air Flow, std ft
3
/min
PRV2 Series
Flow rates are based on testing of PRV2 series valves with
1/4in. female NPT end connections.
PRV6 Series
Flow rates are based on testing of PRV6 series valves with
3/4in. female ISO/BSP end connections.
6 PRV Series Proportional Safety Relief Valves
Dimensions
Dimensions are for reference only and are subject to change.
End Connections Dimensions, in. (mm)
Inlet / Outlet Size A B C D Dia
PRV2 Series
Female NPT
1/4 in.
6.13
(156)
1.18
(30.0)
0.91
(23.0)
2.05
(52.0)
Female ISO/BSP parallel thread
PRV6 Series
Male ISO/BSP parallel thread 1/2 in.
9.89
(252)
2.62
(66.5)
2.22
(56.5)
2.91
(74.0)
Female NPT
3/4 in.
8.87
(226)
1.59
(40.5)
1.20
(30.5)
Female ISO/BSP parallel thread
Male ISO/BSP parallel thread
1 in.
9.97
(254)
2.70
(68.5)
2.30
(58.5)
Female ISO/BSP parallel thread
Ordering Information
Build a PRV series relief valve ordering number by combining the designators in the sequence shown below.
5
Body Material
02 = 316L SS
6
Set Pressure Range
0 = 145 to 580 psig (10.0 to 40.0 bar)
1 = 580 to 1160 psig (40.0 to 80.0 bar)
2 = 1160 to 2175 psig (80.0 to 150bar)
3 = 2175 to 4060 psig (150 to 280 bar)
PRV2 series
4 = 4060 to 5290 psig (280 to 365 bar)
PRV6 series
4 = 4060 to 6000 psig (280 to 413 bar)
8
Seat Seal Material
V = Fluorocarbon FKM
N = Nitrile
1
Series
PRV = 6000 psig (413 bar) maximum
inlet pressure
7
Seal Material
V = Fluorocarbon FKM
N = Nitrile
2
Inlet / Outlet
B = ISO/BSP parallel thread
N = NPT
4
End Connection Thread Style
M = Male
F = Female
B
C
0.10 in.
(2.5 mm)
lock wire
hole
D
A
9
Options
Omit designator if option is not
ordered.
Q = Independent 3rd party witness
testing of set pressure
PRV B 2 F - 02 - 0 - V V - Q
2 41 3 5 6 7 8 9
3
End Connection Size
PRV2 series
2 = 1/4 in.
PRV6 series
4 = 1/2 in. adapter, 3/4 in. main body
6 = 3/4 in.
8 = 1 in. adapter, 3/4 in. main body
PRV6 series valve shown
PRV Series Proportional Safety Relief Valves 7
Poppet Seal Kits
Series
Seal
Material
Poppet Seal Kit
Ordering Number
PRV2
Fluorocarbon FKM
Contact your authorized
Swagelok representative
Nitrile
PRV4/6/8
Fluorocarbon FKM PRV4/6/8-02-V V-3K
Nitrile PRV4/6/8-02-NN-3K
PRV4/6/8 poppet seal kits include O-rings, seat seal, poppet,
and installation instructions.
To order poppet seal kits for PRV series relief valves
purchased from RHPS B.V. having S numbers lower than
4600, contact your authorized Swagelok representative. For
Snumbers 4600 and higher, select the kit from the table
above.
End Connection O-Ring Seals
Series
Seal
Material
End Connection O-Ring
Seal Ordering Number
PRV4/6/8
Fluorocarbon FKM FC-90-SL-O-025
Nitrile BN-90-SL-O-025
Order one O-ring for each end connection as needed.
Optional Certification
Optional independent third-party witness testing of set
pressure testing is available upon request. To order, add -Q
to the valve ordering number.
Example: PRVB4F-02-0-VV-Q
Spring Kits
Series
Spring Kit
Basic Ordering Number
PRV2
Contact your authorized
Swagelok representative
PRV4/6/8 SS-13K-PRV6-
PRV4/6/8 spring kits include spring, 302 SS lock wire with
seal, and installation instructions.
To order, add the spring designator for the desired set
pressure range shown below to the basic ordering number.
Example: SS-13K-PRV6-0
Spring Set Pressure Ranges
Set Pressure Range
psig (bar)
Spring
Designator
145 to 580 psig (10.0 to 40.0 bar) 0
580 to 1160 psig (40.0 to 80.0 bar) 1
1160 to 2175 psig (80.0 to 150 bar) 2
2175 to 4060 psig (150 to 280 bar) 3
PRV2 Series: 4060 to 5290 psig (280 to 365 bar)
PRV4/6/8 Series: 4060 to 6000 psig (280 to 413 bar)
4
Options and Accessories
Additional Products.
■
For additional Swagelok relief valves, see the Proportional
Relief Valves catalog, MS-01-141.
■
For Swagelok tube tting products, see the Gaugeable
Tube Fittings and Adapter Fittings catalog, MS-01-140.
■
For Swagelok pressure gauges, see the Ind)ustrial and
Process Pressure Gauges catalog, MS- 02-170.
Safe Product Selection
When selecting a product, the total system design must
be considered to ensure safe, trouble-free performance.
Function, material compatibility, adequate ratings,
proper installation, operation, and maintenance are the
responsibilities of the system designer and user.
Caution: Do not mix or interchange parts with those of
other manufacturers.
Warranty Information
Swagelok products are backed by The Swagelok Limited
Lifetime Warranty. For a copy, visit swagelok.com or contact
your authorized Swagelok representative.
Swagelok—TM Swagelok Company
© 2012–2019 Swagelok Company
MS-02-432, RevF, April 2019