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™ car tridge
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
