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