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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).

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