Hansen EZ-SRV Series Operating instructions

Specifications, Applications,
Service Instructions & Parts
EZ-SRV™CARTRIDGE
PRESSURE-RELIEF VALVES
Bulletin K129e
JAN 2014
For Ammonia and Halocarbon
Refrigeration Systems
EZ-SRV™
Cartridge Pressure-Relief Valve with EZ-Fitting
INTRODUCTION
Hansen EZ-SRV™ cartridge pressure-relief valves protect
refrigeration pressure vessels and other refrigeration
system components from excessive pressure. If an
abnormally high pressure occurs, the cartridge pressure-
relief valve will open to relieve the excess pressure,
preventing potential damage to equipment and injury
to personnel.
Hansen EZ-SRV™ relief valves are built in strict
conformance with both ASME Boiler and Pressure Vessel
Code requirements and ISO 4126 — Safety Devices for
Protection of Excessive Pressure. Each valve bears the
ASME code symbol of certification (UV). Valve capacities
are rated by the National Board of Boiler and Pressure
Vessel Inspectors (NB).
Refrigeration pressure-relief valves are recommended
for replacement at least every five years. However, if a
relief valve has discharged, it must be replaced as soon
as possible. Valve replacement with the Hansen EZ-SRV™
is fast and easy — saving significant time and expense
compared to traditional relief valves.
The cartridge valve can be replaced more safely than
previously available pressure-relief valves. The Hansen
EZ-Fitting has a ¼˝ NPT connection on the side of
the body. A ¼˝ gauge valve installed with a tell-tale
pressure gauge can indicate overpressure of a valve
and if pressure is present when servicing, the ¼˝ gauge
valve can also be used to safely bleed-off residual
pressure between the three-way manifold valve and
the EZ-SRV™ valve.
KEY FEATURES
ADDITIONAL FEATURES
Cartridge design allows quick and easy replacement.
Matched capacities to existing Hansen H5600
“R” series
Low blowdown (15% or less) for gas service
EZ-Fitting is a permanent fixture, available with
welded or threaded end connections
MPT inlet eliminates need for nipple
EZ-Adapter component available for retrofit of existing
Hansen relief valves
Liquid Rated Relief Valve (EZLQ) available
inch
No.
Serial
Air
Capacity
Pressure
Size
Set
I n l e t
Cat. No.
O u t l e t
HANSEN TECHNOLOGIES
U.S.A.CORPORATION

2
K129e
JAN 2014
NAMEPLATE INFORMATION
The nameplate, located on the side of Hansen EZ-SRV™
cartridge pressure-relief valves, contains important
information about the valve pressure setting, capacity
and date of manufacture. The date code traces the
month and year the valve was built. Example: A valve
with Serial No. 06B 10, indicates that it was built in June
of 2010. See nameplate below for location of data and
photo of EZ-SRV replacement cartridge.
1. CATALOG NUMBER
2. AIR CAPACITY OR LIQUID FLOW RATE
ACCORDING TO THE SET PRESSURE
3. SET PRESSURE
4. INLET SIZE
5. MONTH AND DAY OF MANUFACTURE AND
VALVE NUMBER
6. YEAR OF MANUFACTURE AND CURRENT
REVISION LETTER
1
2
4
6
5
3
APPLICATIONS
Hansen EZ-SRV™ cartridge pressure-relief valves
typically are installed on pressure vessels to protect
from overpressure. Several design codes for refrigeration
systems require that pressure vessels have protection
from excessive pressure. For example, Hansen cartridge
pressure-relief valves comply with the requirements
of ANSI/ASHRAE Standard 15 Safety Standard for
Refrigeration Systems, and ANSI/IIAR 2 Equipment,
Design, and Installation of Closed-Circuit Ammonia
Mechanical Refrigerating Systems. Once installed,
a properly selected Hansen EZ-SRV™ cartridge
pressure-relief valve will vent to atmosphere excessive
overpressure. After discharge, these valves will quickly
reseat to minimize loss of refrigerant. After discharge,
relief valves must be replaced as soon as possible
because debris may have settled on the seat, allowing
the seat to leak out refrigerant. Hansen EZ-SRV™ valves
must be installed in the vapor space above the liquid
level of any vessel or component which contains liquid
and vapor. (Hansen offers the EZLQ, a liquid relief valve
for use with ASME rated pressure vessels and is rated
U.S. GPM.)
MATERIAL SPECIFICATIONS
EZ-Fitting Body: ASME SA105 steel
EZ-SRV™ Cartridge: ASME SA395, ductile iron
Internal Seating Components: stainless steel
Piston: stainless steel
Seat O-rings: neoprene
Spring: stainless steel
Maximum Temperature Rating: 240°F (115°C)
Safe Working Pressure: 600 psig (41 bar)
Setting Range:
Gas Service: 150 to 600 psig (10.4 to 41 bar)
Liquid Service: 50 to 100 psid (3.4 to 6.9 bar)
Reseat Pressure (blowdown):
Gas Service: within 15% below set point
Liquid Service: within 20% below set point
CODE AND STANDARD COMPLIANCE
ASME Boiler and Pressure Vessel Code, Section VIII,
Division 1
ANSI/ASHRAE Standard 15 Safety Standard for
Refrigeration Systems
ANSI/IIAR 2 Equipment, Design, and Installation of
Closed-Circuit Ammonia Mechanical Refrigerating
Systems
ISO 4126, Safety Devices for Protection of Excessive
Pressure
PED (Pressure Equipment Directive) Category IV
EZ-SRV Replacement Cartridge

3K129e
JAN 2014
Value of f** (SI)
0.5 (0.041)
1.6 (0.131)
2.5 (0.203)
1.0 (0.082)
Refrigerant
ammonia (R-717)
† R-22, R-134a
† R-404A, R-410A, R-507A
CO2 (R-744)
PRESSURE-RELIEF VALVE CAPACITY RATINGS
CAT NO AIR
CAPACITY
PRESSURE SETTING, PSIG
(BAR)
150
(10.3)
175
(12.1)
200
(13.8)
225
(15.5)
250
(17. 2)
275
(19)
300
(20.7)
325
(22.4)
350
(24.1)
400
(27.6)
450
(31.0)
500
(34.5)
550
(37.9)
600
(41.4)
EZB
lb/min 10.5 12.2 13.8 15.4 17.0 18.6 20.2 21.8 23.5 26.7 30 33 36 40
scfm 140 162 183 205 226 248 269 290 312 355 398 441 484 526
kg/hr 286 330 373 418 461 506 549 592 636 724 812 900 987 1075
EZC
lb/min 22 25 29 32 36 39 42 46 49 56 62 69 76 83
scfm 292 337 382 427 472 517 561 606 651 741 831 920 1010 110 0
kg/hr 598 689 780 872 963 1055 1146 1238 1329 1512 1695 1878 2061 2244
EZE
lb/min 28 33 37 41 46 50 54 59 63 72 – – – –
scfm 377 435 492 550 608 665 723 781 839 954 – – – –
kg/hr 770 888 1006 1123 1241 1359 1477 1595 1712 1948 – – – –
EZF
lb/min 34 39 44 49 54 60 65 70 75 85 – – – –
scfm 449 518 586 655 724 793 861 930 999 1136 – – – –
kg/hr 916 1056 1196 1336 1477 1617 1757 1897 2038 2317 – – – –
For other refrigerants see ANSI/ASHRAE 15 or contact factory.
** When combustible materials are used within 20 feet (6.1 m) of a pressure vessel, multiply the value of f by 2.5.
† Refer to the Rupture Disc Assemblies section of this bulletin
Example: To determine the minimum required capacity of a relief valve for a vessel containing ammonia that
measures 16 feet (4.9 m) in length and 6 feet (1.8 m) in outside diameter, the equation would be as follows:
0.5 x 6 x 16 = 48 lb/min (0.041 x 4.9 x 1.8 = 0.362 kg/s = 1302 kg/hr).
Step 2: Determine the pressure setting needed. This should be at or below the design pressure of the vessel. The
relief setting should also be at least 25% above the maximum expected operating pressure to avoid “weeping” of
relief valves. The setting may be below (never above) the design pressure of the vessel, but it is sometimes best to
match vessel design pressure and relief setting to minimize the likelihood of a discharge.
Step 3: Refer to the Pressure-Relief Valve Capacity Ratings above and select the valve with the required capacity
(C) in lb/min (kg/hr) at the desired pressure setting.
SELECTION
Step 1: Use the formula below, per ANSI/ASHRAE Standard 15 Safety Standard for Refrigeration Systems, to calculate
the minimum required discharge capacity in pounds of air per minute (or kg/s). When selecting a dual pressure-relief
valve system, each individual valve must have sufficient capacity to protect the vessel.
C=fDL
C = minimum required discharge capacity of the relief device in pounds of air per minute (kg/s).
D = outside diameter of vessel in feet (m).
L = length of vessel in feet (m).
f = factor dependent upon type of refrigerant**

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K129e
JAN 2014
INSTALLATION
Protect pressure-relief valves from dirt and moisture.
Match capacity on valve nameplate to system document
as specified by system designer and based upon
protected vessel size. Mount valve directly at the vapor
space of pressure vessel or on connecting non-valved
vapor piping as close to the vessel as possible. (Model
EZLQ liquid relief valves can be connected where
liquid is to be expected and relieved to a similar or
lower pressure, not to exceed the set pressure of the
relief valve. Generally, the relief valve is piped around
the isolation valve of the protected section or vessel).
EZ-SRV™ Cartridge pressure-relief valves should be
installed upright.
Never expose your face or body to a connected relief
valve exit or piping.
Check that the valve setting and capacity (see Nameplate
Information Section) meets the requirements per
system design in accordance with local and national
regulations. Isolate the valve and related piping from
the refrigeration system and pump out pressure to zero
before attempting to install or replace any pressure-
relief valve. Use appropriate safety equipment. Avoid
residual refrigerant when doing so. A gauge valve and
gauge can be installed in the inlet pressure port for
future use to verify and control any refrigerant which
might remain. See also Gauge Valves and Pressure
Gauges section on page 6.
Remove shipping caps from the EZ-Fitting. Thread or
weld EZ-Fitting into the pressure vessel or three-way
dual shut-off valve at a location in the vapor space
above the liquid refrigerant level. Install the EZ-SRV™
cartridge pressure-relief valve into the EZ-Fitting and
tighten to approximately 75 foot–lbs (102Nm). These
valves are for gas relief only. (For liquid relief, Hansen
offers the EZLQ relief valve specifically designed for
liquid, refer to page 6). Do not install shut-off valves in
line with pressure-relief valves. Install valves in locations
where they will not be damaged by moving equipment
such as lift trucks, etc. Install valves in a manner that
enables them to be replaced.
When a dual pressure-relief system is being put into
service, the three-way valve stem should be positioned
so that only one valve is exposed to pressure. While
the three-way valve can be either frontseated (front
port is closed) or backseated (back port is closed), the
backseated position is recommended because it takes
pressure off the packing and reduces the possibility of
packing leaks.
Vent the relief valve exit to a safe outdoor location in
an approved manner away from people and building
openings. Do not install valves or vent piping in a
refrigerated space unless precautions are taken to
prevent moisture migration into the valve body or the
relief vent line. Avoid trapped ice build-up between
valves and other equipment.
Only apply thread sealing compound to external pipe
threads and use a modest amount to avoid getting
compound inside the valve. Use brackets or hangers
to support the pipe and prevent the valve from being
overly stressed. Do not put undue stress on the valve
by using it to stretch or align pipe.
Pressure test all valves and related piping for leaks.
When testing a dual pressure-relief system, the three-
way valve stem should be in the mid position (only during
testing), ensuring that all valves are properly leak tested.
Do not discharge valves prior to installation or when
pressure testing. Never attempt to reset or change the
valve setting. Always replace cartridge pressure-relief
valves once they have discharged.
Hansen EZ-SRV™ valves come with an installation date
tag to identify the number of years the valve has been
in service. When installing the EZ-SRV™ valve, remove
the knockouts corresponding to the current year and
month. Use a pen to push the knockout partially through
the tag and tear away from other side.
Pressure-relief valves for ammonia refrigeration are
subject to preventative inspection and maintenance or
periodic replacement. Normal replacement is five years
from installation. However, once a valve discharges it
must be replaced as soon as possible. Self-reseating is
not dependable because of the possibility of dirt lodging
on the seat surface allowing the valve to leak or “weep”.
REPLACING EXISTING RELIEF VALVES
EZ-SRV™ cartridge pressure-relief valves have the
same capacity as the Hansen H5600 “R” series relief
valves. The Hansen EZ-Adapter is available to make
the inlet and outlet connection dimensions the same
as the Hansen H5600 series. This minimizes piping
changes to the discharge line connections. The EZ-
Adapter provides the same centerline dimensions as an
H5600 series relief valve installed with a 2˝ long nipple.
½˝ EZ-Adapter, p/n 40-0331. ¾˝ EZ-Adapter, p/n 40-0332.
OUTLET
INLET
OUTLET
OUTLET
INLET
OUTLET

5K129e
JAN 2014
inch:
No.:
Serial
Air
Capaci ty:
Pressure:
Size
Set
I n l e t
Cat. No.:
O u t l e t
HANSEN TECHNOLOGIES
U.S.A.CORPORATION
EZ-FITTING CONNECTIONS (DN)
BT1/BW1 1/2˝ x 3/4˝ (15 x 20)
BT2/BW2 3/4˝ x 1˝ (20 x 25)
BT4/BW4 1˝ x 1-1/4˝ (25 x 32)
BT5/BW5 1-1/4˝ x 1-1/2˝ (32 x 40)

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K129e
JAN 2014
SERVICE AND MAINTENANCE
These tamper-resistant cartridge pressure-relief
valves are accurately factory set and do not require
any field adjustments whatsoever. They are intended
for one time over-pressure operation and should be
replaced immediately after discharging because
setting or seat tightness may be altered. Annually,
EZ-SRV™ cartridge pressure-relief valves shall be
visually inspected for corrosion or accumulation of
scale and for leaks. Removal of the cartridge is not
normally required for inspection. Pressure-relief valves
should be removed and replaced with new valves at
least every five years. Even when simply replacing an
existing valve, a review of requirements per current
local and national code is advisable. Valves must
not be removed unless system has been evacuated
to zero pressure.
CARTRIDGE REPLACEMENT
Hansen EZ-SRV™ cartridge pressure-relief valves can
be replaced safely and easily. First close the three-way
manifold valve to the pressure-relief valve. Slowly bleed
the pressure between the three-way manifold valve
and the pressure-relief valve to zero pressure. Turn
the EZ-SRV™ cartridge two turns to relieve pressure
to the discharge piping. Be sure there is no residual
pressure and slowly remove the EZ-SRV™ cartridge
valve. Clean the interior of the EZ-Fitting especially
where the two o-ring surfaces are located. Make sure
the EZ-SRV™ cartridge valve setting and capacity
(see Nameplate section) match the one being replaced
and the requirements of the system design. Lightly oil
or grease the o-rings on the replacement EZ-SRV™
cartridge valve and screw into the EZ-Fitting. Tighten
to approximately 75 foot-lbs (102 Nm). Wire lugs are
provided for optional tamper evident sealing using
customer provided locking wire and seal. Next, with a
pressure gauge installed on the gauge valve, open the
three-way manifold slightly to reach normal pressure.
Check for leaks at the EZ-Fitting and EZ-SRV™ cartridge
valve joint. Open the three-way valve completely to put
the pressure-relief valve back in service.
Punch out the year and month on the installation date
tag. The five year replacement date will show on the back.
LIQUID RELIEF VALVES
Hansen Technologies offers EZLQ pressure-relief valves
for liquid relief applications. Typical applications include
ASME vessels, oil coolers and other components that can
be isolated by control valves or manual shut-off valves.
Hansen EZLQ liquid relief valves operate on pressure
differential. Set points are low differentials of 50, 75, and
100 psid. The equipment the liquid relief valve is protecting
must be designed for a pressure greater than the sum of
the design operating pressure of the outlet piping plus
the differential pressure of the liquid relief valve.
Sizing the capacity of the liquid relief valve depends on
the liquid properties and the rate (U.S. GPM) of heating of
the liquid. Details on calculating the flow rate are given in
the ANSI/IIAR 2-2008 Appendix G and API Standard 520.
Installation and servicing of liquid relief valves may require
special precautions. Liquid relief valves should be piped
back into the system, not to atmosphere. Appendix M of
Section VIII, Boiler & Pressure Vessel Code has general
information on installation and service of liquid relief valves.
GAUGE VALVES AND PRESSURE GAUGES
Hansen EZ-Fittings have a 1/4˝ inlet pressure port and
come with a factory installed hex head plug. It is strongly
suggested that the port be fitted with an MPTxFPT gauge
valve, such as the Hansen H7771, to facilitate safer and
controlled servicing. The hex head plug should be installed
in the gauge valve outlet to prevent accidental refrigerant
loss. Alternately, the gauge valve can be fitted with a Hansen
HG27 pressure gauge. This compact pressure gauge
features a 2˝ (50 mm) diameter face with an easy-to-read
dial. The black needle indicates current sensed pressure,
and is useful when replacing a valve, determining which
relief valve is active, monitoring vessel pressure, or for
general system troubleshooting. The red tell-tale needle
indicates the highest pressure as seen by the gauge. This
can be useful in identifying which relief valve has discharged
or has experienced an abnormally high pressure. The
tell-tale needle can be easily reset for monitoring purposes.
Catalog Number: HG27 Pressure Gauge
Connection: 1/4˝ MPT
Safe Working Pressure: 600 psig (41 bar)
Scale Range: 0 psig to 600 psig and 0 to 4000 kPa
Ambient Temperature Range: +32ºF to +125°F
(0°C to +52°C). Contact Hansen for application below
+32°F (0°C) ambient temperature.
Suitable for ammonia and other Hansen approved
refrigerants.
2.00" (50 MM)
RED TELL-TALE
BLACK
ADJUSTMENT
SCREW
1/4" NPT
3.00"
(75 MM)
NEEDLE
NEEDLE
DIA FACE
600
500
300
200
100
0
400
0
psi
k a
20 0
1000 3000
4000
kPa
inch:
No.:
Serial
Air
Capacity:
Pressure:
Size
Set
I n l e t
Cat. No.:
O u t l e t
HANSEN TECHNOLOGIES
U.S.A.CORPORATION
1/4" INLET
PRESSURE PORT
WIRE LUGS
O-RINGS
EZ-FITTING
GAUGE
VALVE
H771
OPTIONAL
PRESSURE
GAUGE
HG27
OPTIONAL
INSTALLATION
DATE TAG
RELIEF
VALVE
PRESSURE-
CARTRIDGE
EZ-SRV
600
500
300
200
100
0
400
0
psi
k a
20 0
1000 3000
4000

7K129e
JAN 2014
CAT NO CONNECTION
SIZE (DN)
DIMENSIONS (MM)
A B C D E
H8021 ½˝ FPT (15) 3.63˝
(92)
2.38˝
(60)
3.38˝
(86)
1.75˝
(44)
6.00˝
(152)
H8022 ¾˝ FPT (20)
H8024 1˝ FPT (25) 5.88˝
(149)
3.75˝
(95)
4.00˝
(102)
2.00˝
(51)
8.00˝
(203)
H8025 1¼˝ FPT (32)
To Order: Specify catalog number and connection
size. For SW add S suffix, for BW add W suffix.
Examples: H8021S, H8025W
Material: ASTM A105 Steel
Safe Working Pressure: 600 PSIG (41 Bar)
RUPTURE DISC ASSEMBLIES
Hansen Rupture Disc Assemblies (RDAs) indicate when
a pressure-relief valve has discharged. A pressure-relief
valve will reseat after discharging, however a rupture
disc remains open after bursting. An installed pressure
gauge or switch (required by code) provides a visual
or electronic indication that the rupture disc has burst.
Rupture disc assemblies provide a hermetic seal to help
eliminate any possibility of minute losses of refrigerant
via pressure-relief valve seat materials. Rupture disc
assemblies are required when using Hansen pressure-
relief valves in halocarbon applications because the high
cost of such refrigerants demands extreme tightness. For
detailed information on Hansen rupture discs, including
ordering and ASME capacity requirements, see Hansen
Bulletin K209.
CAT NO CONNECTION SIZE
(MPT X MPT)
PRESSURE SETTING
PSIG
RDA1 ½˝ x ½˝ 150, 250, 300, 350, 400
RDA2 ¾˝ x ¾˝ 150, 250, 300, 350, 400
RDA4 1˝ x 1˝ 150, 250, 300, 350
RDA5 1¼˝ x 1¼˝ 150, 250, 300, 350
RUPTURE DISC ACCESSORIES
HPS Pressure Switch, 1/8˝ NPT
HG25 Pressure Gauge, 1/8˝ NPT
40-0333 ½˝ Plated Coupling
40-0334 ¾˝ Plated Coupling
To Order: Specify catalog number, pressure setting, and
pressure gauge (HG25) or switch (HPS). Use a rupture
disc assembly with the same or lower pressure setting
as the pressure relief valve. Rupture discs require use
with plated coupling.
EZ-SRV shown with Three-Way Shut-off Valve
and optional Rupture Discs, Gauge Valves
and Pressure Gauges
THREE-WAY DUAL SHUT-OFF VALVES
(SHOWN BACKSEATED)
OUTLET
(OPEN)
OUTLET
(CLOSED)
A
B
C
D
INLET
E
STEM OUT
DUAL PRESSURE-RELIEF VALVES
In accordance with ANSI/ASHRAE Standard 15 Safety
Standard for Refrigeration Systems, pressure vessels
having 10 cubic feet or more of internal gross volume,
shall be fitted with dual pressure-relief valves. This is
typically accomplished using a pair of pressure-relief
valves interconnected via a three-way dual shut-off
valve. Even on smaller vessels this arrangement is
often preferred because one valve remains operational,
while the other is being replaced; thereby eliminating
the need to remove refrigerant from the vessel. Hansen
can provide any or all the necessary components, in
addition to the actual relief valves, as follows:
THREE-WAY DUAL SHUT-OFF VALVES
These rugged, forged steel bodied valves facilitate the
parallel installation of pressure-relief valves. Because
three-way valves will not isolate both pressure-relief
valves simultaneously, they are considered the only
acceptable type of shut-off valve for use with refrigerant
relief piping. Their durable metal-to-metal seating and
patented non-leak packing plus o-ring stem seal design
combine for long, trouble-free service. Inlet and outlet
connections are threaded female NPT all the same size.
SW and BW connections are also available (see below).
Shown below is a three-way dual shut-off valve in the
stem out position (backseated). The valve stem should
be positioned so that only one pressure-relief valve is
activated. While the valve can be either frontseated
(front port is closed) or backseated (back port is closed),
the backseated position (shown) is recommended for
normal use because it takes pressure off the packing
and reduces the possibility of packing leaks.

8
K129e
JAN 2014
Hansen Technologies Corporation
400 Quadrangle Drive, Suite F
Bolingbrook, Illinois 60440 USA
Tel: [phone] Fax: [phone] Toll: 866.4HANSEN
Email: [email protected] Web: www.hantech.com
USA ∙ Asia ∙ Europe ∙ India ∙ LatinAmerica ∙ MiddleEast
© 2012 Hansen Technologies Corporation
CAUTION
These instructions and related safety precautions must
be read and completely understood before selecting,
using, or servicing these valves. Only knowledgeable,
trained refrigeration mechanics should install, operate,
or service valves. Stated temperature and pressure
limits should not be exceeded. Valves should not be
removed unless system has been evacuated to zero
pressure. See also safety precautions in current List
Price Bulletin and Safety Precautions Sheet supplied
with product. Escaping refrigerant might cause personal
injury, particularly to eyes and lungs.
WARRANTY
Hansen valves are guaranteed against defective materials
and workmanship for one year F.O.B. our factory. No
consequential damage or field labor is included.
ORDERING INFORMATION – EZ-SRV™REFRIGERANT GAS SERVICE RELIEF VALVES
CATALOG NUMBER
(EZ-SRV + EZ-FITTING) CONNECTION SIZE (DN) EQUIVALENT
H5600 “R”
SERIES VALVE
REPLACEMENT
CARTRIDGE
VALVE ONLY
THREADED (MPT) WELDED (BW) BOTTOM INLET SIDE OUTLET
EZB-BT1 EZB-BW1 ½˝ (15 mm) ¾˝ (20 mm) H5600R EZB
EZB-BT2 EZB-BW2 ¾˝ (20 mm) 1˝ (25 mm) H5602R
EZC-BT2 EZC-BW2 ¾˝ (20 mm) 1˝ (25 mm) H5632R EZC
EZE- BT4 EZE-BW4 1˝ (25 mm) 1¼˝ (32 mm) H5633R EZE
EZF-BT5 EZF-BW5 1¼˝ (32 mm) 1½˝ (40 mm) H5634R EZF
Standard pressure settings are: 150*, 175, 200, 225, 250*, 275, 300*, 325, 350, 400, 450, 500, 550, and 600 psig. (*Stock pressure
settings.) Custom pressure settings (including bar and kPa) and ODS connections are available; contact factory. May require extra
delivery time.
To Order: Specify Catalog Number, Pressure Setting, Optional H7771 Gauge Valve and HG27 Pressure Gauge,
EZ-Adapter if needed, and accessories. ½˝ EZ-Adapter, p/n 40-0331; ¾˝ EZ-Adapter, p/n 40-0332. For halocarbon
applications, a rupture disc assembly is required. Refer to page 7 and to Hansen Bulletin K209. CE marked valves
are available, add the letter “E” suffix to catalog number (example: EZC/300E-BT2).
To Order Dual Kits or Dual Union Kits: Add “D” suffix for Dual Kit or “DU” suffix for Dual Union Kit to EZ-SRV™
pressure-relief valve catalog number. Specify inlet/outlet connection size and pressure setting. These kits are not
available as SW or BW; order items separately.
Examples: Dual Kit: EZB-BT1D, set at 250 psig; Dual Union Kit: EZC-BT2DU set at 300 psig.
ORDERING INFORMATION – EZ-SRV™REFRIGERANT LIQUID RELIEF VALVES
CATALOG NUMBER
(EZ-SRV + EZ-FITTING) CONNECTION SIZE (DN) CAPACIT Y
GPM – WATER
REPLACEMENT
CARTRIDGE
VALVE ONLY
THREADED (MPT) WELDED (BW) BOTTOM INLET SIDE OUTLET
EZLQ-BT1 EZLQ-BW1 ½˝ (15 mm) ¾˝ (20 mm) 13 GPM@50 psid
16 GPM@75 psid
18 GPM@100 psid
EZLQ
EZLQ-BT2 EZLQ-BW2 ¾˝ (20 mm) 1˝ (25 mm)
Custom pressure settings and ODS connections are available; contact factory.
To Order: Specify catalog number and pressure setting: 50, 75, or 100 psid.
DUAL/DUAL UNION PRESSURE-RELIEF KITS
Hansen’s EZ-SRV™ Dual Pressure-Relief Valve Kit
includes: one (1) three-way dual shut-off valve and two
(2) EZ-SRV™ pressure-relief valves with EZ-Fittings;
available ½˝ to 1¼˝ inlet sizes. The EZ-SRV™ Dual Union
Pressure-Relief Valve Kit consists of: one (1) three-way
dual shut-off valve, two (2) EZ-SRV™ pressure-relief
valves with EZ-Fittings and two (2) unions for a single
outlet; available ½˝ and ¾˝ inlet sizes. Unions at the
outlets of both pressure-relief valves facilitate field fitting
and service testing. Both kits require field assembly.
Assembled kits are shown below.
DUAL RELIEF KIT DUAL UNION RELIEF KIT