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SAFETY DEVICES

Part No

Certified

Pressure Range

(PSI)

Valve Capacity Ratings (lbs. Air/min) for Brass

Standard Pressure Setting (PSI)

150

235

300

350

400

450

500

5230

150-450

5.0

7.6

9.6

11.2

12.7

14.3

N/A

5231

150-450

5.0

7.6

9.6

11.2

12.7

14.3

N/A

526E

150-450

5.0

7.6

9.6

11.2

12.7

14.3

N/A

5250A-1/2

200-500

N/A

29.0

36.5

42.4

48.2

54.0

59.9

5250-1/2

200-500

N/A

29.0

36.5

42.4

48.2

54.0

59.9

5252-3/4

200-500

N/A

29.0

36.5

42.4

48.2

54.0

59.9

*5350-1/2

200-500

N/A

29.0

36.5

42.4

48.2

54.0

59.9

*5352-3/4

200-500

N/A

29.0

36.5

42.4

48.2

54.0

59.9

5244-3/4

150-450

33.2

50.5

63.8

73.9

84.1

94.3

N/A

5244-1

150-450

33.2

50.5

63.8

73.9

84.1

94.3

N/A

*5344-3/4

150-450

33.2

50.5

63.8

73.9

84.1

94.3

N/A

*5344-1

150-450

33.2

50.5

63.8

73.9

84.1

94.3

N/A

5246A-1

150-400

70.5

107.2

135.2

156.8

178.4

N/A

N/A

5246A-1-1/4

150-400

70.5

107.2

135.2

156.8

178.4

N/A

N/A

*5345A

150-400

70.5

107.2

135.2

156.8

178.4

N/A

N/A

*5346A-1-1/4

150-400

70.5

107.2

135.2

156.8

178.4

N/A

N/A

Part No

Certified Pressure

Range (PSI)

Valve Capacity Ratings (lbs. Air/min) for Steel (Stainless and Cast)

Standard Pressure Setting (PSI)

150

250

300

5600

150-450

30.9

49.9

59.4

5601

150-450

35.8

57.7

68.7

5602

150-450

35.8

57.7

68.7

5603

150-450

37.5

60.4

71.9

5604

150-450

72.0

116.1

138.1

Determining Minimum Required Discharge Capacity

ASHRAE has a guideline to determine the minimum required discharge

capacity for refrigeration relief valves. Reference ASHRAE 15-2001 Section

9.7.5. Use the following equation and refrigerant factors given to determine

the minimum required capacity.

C = Min. Required Capacity (lbs-air/min)

D = Outside Diameter of Vessel, ft

L = Length of Vessel, ft

f = refrigerant factor, see chart.

C = ƒ * D * L

Refrigerant

ƒ

Refrigerant

ƒ

R-11

1.00

R-401A (MP-39)

1.60

R-12

1.60

R-402A (HP-80)

2.50

R-13, R-13B1

2.00

R-404A (HP-62)

2.50

R-14

2.50

R-406A

1.60

R-22

1.60

R-407C

1.60

R-113

1.00

R-408A

2.00

R-114

1.60

R-409A (FX-56)

1.60

R-115

2.50

R-410A (AZ-20)

2.50

R-123

1.00

R-500

1.60

R-134a

1.60

R-502

2.50

R-142b

1.00

R-600 (n-Butane)

1.00

R-152a

1.00

R-600a (Isobutane)

1.00

R-170 (Ethane)

1.00

R-717 (Ammonia)

0.50

R-290 (Propane)

1.00

R-744 (CO2)

1.00

R-1150 (Ethylene)

1.00

R764

1.00

Installation Notes

1.

The installation location of the Pressure Relief Valve shall be

above the liquid line, where the inlet to the relief valve should

only be exposed to vapor or gas.

2.

The Pressure Relief Valve should not be discharged prior to

installation or when pressure testing the system.

3.

Pressure Relief Valves should be mounted vertically.

4.

Henry Technologies’ Pressure Relief Valves are designed to be

replaced after opening to full discharge. The set pressure after a

discharge will most often be 5-15% lower than the original

setting. This can be due to debris exiting the system through the

valve which had deposited upon the seat disc, and altering the

alignment of the internal parts.

5.

Additional installation notes are shown on the instruction sheet

accompanying the Pressure Relief Valve, instruction sheet

drawing number 5-025-002.

6.

Pressure Relief Valves should not be installed on discharge lines,

as the continuous high temperatures may have adverse affects

on the relief valve's performance.

7. Henry Technologies follows the recommendation provided by the

International Institute of Ammonia Refrigeration (IIAR) in their

Bulletin 109 “IIAR Minimum Safety Criteria For a Safe Ammonia

Refrigeration System” recommends to replace Pressure Relief

Valves on a five year interval. If a Pressure Relief Valve opens to

full discharge it should be replaced immediately.

33

Part No

Certified Pressure

Range (PSI)

Valve Capacity Ratings (lbs. Air/min) for High Pressure Brass

Standard Pressure Setting (PSI)

500

550

600

650

675

5233AX

500-675

36.0

39.5

43.0

46.5

48.2

5234AX

500-675

36.0

39.5

43.0

46.5

48.2

5235AX

500-675

36.0

39.5

43.0

46.5

48.2