Specifications, Applications,
Service Instructions & Parts
REFRIGERANT
PRESSURE-RELIEF
VALVE
Bulletin K109i
AUG 2015
For Ammonia and
Halocarbon Gas Service
Safety Relief to Atmosphere
Pressure-Relief Valve
INTRODUCTION
Designed to provide emergency relief from excessive pressure
in refrigerant-containing vessels, they are built in strict
conformance with ASME Boiler and Pressure Vessel Code
requirements for safety relief devices.
Each valve bears the
ASME code symbol of certification (UV).
Their capacities
are rated by the National Board of Boiler and Pressure Vessel
Inspectors. These tamper-resistant valves are accurately set
and sealed by qualified technicians at the factory.
APPLICATIONS
Hansen pressure-relief valves help meet the requirements
of ANSI/ASHRAE 15 Safety Standard for Refrigeration
Systems as well as other worldwide codes. This standard
requires pressure vessels of all refrigeration systems to
be protected by a pressure-relief device or other approved
means to safely relieve pressure in the event of fire or
other abnormal conditions. Once installed, a properly
selected Hansen pressure-relief valve is ready to vent to
atmosphere any temporary excessive overpressure inside
of a vessel. After discharge, these valves will attempt to
reseat to minimize loss of refrigerant. However, once any
relief valve has discharged, it must be replaced as soon
as possible because debris may have settled on the seat
during discharge.
Hansen pressure-relief valves should be connected to the
vapor space
of refrigerant vessels, heat exchangers, oil
pots, oil stills, pilot receivers, and elsewhere as may be
required by various codes.
Where dual pressure-relief valves are required, Hansen
offers the three-way valves and other components necessary
for assembly; see page 4. Rupture disc assemblies are
required when using Hansen pressure-relief valves for
halocarbon applications because the high cost of such
refrigerants demands extreme tightness, see bulletin K209.
Also, see Bulletin K129 for information on the EZ-SRV Relief
Valves. These pressure-relief valves offer a cartridge style
design for ease of replacement without disturbing the piping.
EZ-SRV pressure-relief valves are available in pressure
ratings to 600 psi (matching the H5600 “R” series capacities
through 400 psi). Liquid relief valves are also available in
the EZ-SRV series. EZLQ relief valves are designed and
rated for liquid applications.
KEY FEATURES
INSTALLATION
DATE TAG
STAINLESS STEEL
SEAT INSERT
DUCTILE IRON
BODY FOR ADDED
STRENGTH
ACCURATELY
FACTORY SET
AND SEALED
PREMIUM GRADE
VIRGIN TEFLON
SEAT DISC
STAINLESS STEEL
PISTON
STAINLESS
STEEL SPRING
NEOPRENE O-RING
HELPS SEAL VALVE
FROM MOISTURE
ORDERING INFORMATION
O
N
T
A
C
T
P
N
-
S
N
O
I
T
C
E
N
N
O
C
D
E
D
A
E
R
H
T
BOTTOM INLET (DN)
SIDE OUTLET (DN)
R
0
0
6
5
H
1
/
2
T (15)
P
F
"
3
/
4
T (20)
P
F
"
A
0
0
6
5
H
1
0
6
5
H
1
/
2
T (15)
P
F
"
PT (25)
F
"
1
2
0
6
5
H
3
/
4
T (20)
P
F
"
PT (25)
F
"
1
R
2
0
6
5
H
R
2
3
6
5
H
3
1
6
5
H
T (25)
P
F
1"
1
1
/
4
T (32)
P
F
"
1
1
/
2
T (40)
P
F
"
1
1
/
4
T (32)
P
F
"
R
3
3
6
5
H
4
0
6
5
H
R
4
3
6
5
H
Specify catalog number, inlet/outlet connection size, and
pressure setting. For halocarbon applications, a rupture
disc assembly is required. See Rupture Disc Assembly
section of this bulletin. Standard pressure settings: 150*,
175, 200, 225, 250*, 275, 300*, 325, and 350 psig. (*Stock
pressure settings.) Custom pressure settings available;
may require extra delivery time. The H5600 “R” series
valves have reduced capacities, see page 2. CE marked
valves are available, add the letter “E” suffix to catalog
number (example: H5601/250E).
