4
K109i
AUG 2015
Hansen Technologies Corporation
400 Quadrangle Drive, Suite F
Bolingbrook, Illinois 60440 USA
Tel: 630.325.1565 Fax: 630.325.1572 Toll: 866.4HANSEN
Email: [email protected] Web: www.hantech.com
USA ∙ Asia ∙ Europe ∙ India ∙ Latin America ∙ Middle East
© 2015 Hansen Technologies Corporation
In accordance with ANSI/ASHRAE 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.
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.
THREE-WAY DUAL SHUT-OFF VALVE
(SHOWN BACKSEATED)
DUAL PRESSURE-RELIEF KITS
Hansen’s Dual Pressure-Relief Valve Kit includes one
(1) three-way dual shut-off valve, two (2) pressure-relief
valves, and two (2) nipples; for field assembly, The Dual
Kit is available 1/2" to 1-1/4".
TO ORDER:
Add “D” suffix for Dual Kit to pressure-relief valve catalog
number. Specify inlet/outlet connection size and pressure
setting.
RUPTURE DISC ASSEMBLIES
Hansen rupture disc assemblies (RDAs) are used to indicate
which pressure-relief valve has discharged.
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 more detailed information, including ordering
and ASME capacity requirements, see Hansen Bulletin K209.
CAUTION
Hansen pressure-relief valves and three-way dual shut-
off valves are only for refrigerant gas relief and cannot be
used for liquid relief. 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 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 warranted against defective materials
and workmanship for one year Ex Works our factory. No
labor is included. Terms and conditions of sale apply.
TO ORDER:
Please specify three-way dual shut-off valve catalog number
and connection size.
OUTLET
(OPEN)
OUTLET
(CLOSED)
A
B
C
D
INLET
E
STEM OUT
T
A
C
O
N
N
O
I
T
C
E
N
N
O
C
E (DN)
Z
I
S
(MM)
S
N
O
I
S
N
E
M
I
D
A
B
C
D
E
1
2
0
8
H
1
/
2
T (15)
P
F
"
3.63"
(92)
2.38"
(60)
3.38"
(86)
1.75"
(44)
6.00"
(152)
5.88"
(149)
3.75"
(95)
4.00"
(102)
2.00"
(51)
8.00"
(203)
2
2
0
8
H
3
/
4
T (20)
P
F
"
4
2
0
8
H
PT (25)
F
"
1
1
5
2
0
8
H
1
/
4
T (32)
P
F
"
DUAL PRESSURE-RELIEF VALVES
Material: ASTM A105 Steel
Safe Working Pressure: 600 PSIG (41 Bar)
DUAL KIT
RUPTURE DISC SHOWN
WITH PRESSURE GAUGE
