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71SO Overfill Prevention Valve

The CARB-certified OPW 71SO vapor-tight Overfill Prevention Valve is designed to prevent the overfill of underground storage tanks by providing a positive shut-off of product delivery. The shut-off valve is an integral part of the drop tube used for gravity filling. The OPW 71SO allows easy installation (without breaking concrete) and requires no special manholes.

The OPW 71SO is a vapor-tight two-stage shut-off valve. When the liquid level rises to about 95% of tank capacity, the valve mechanism is released, closing automatically with the flow. This reduces the flow rate to approximately 5 gpm through a bypass valve. The operator may then stop the filling process and disconnect and drain the delivery hose. As long as the liquid exceeds the 95% level, the valve will close automatically each time delivery is attempted.

If the delivery is not stopped and the liquid rises to about 98% of tank capacity, the bypass valve closes completely. No additional liquid can flow into the tank until the level drops below a reset point. 

Raising the Standard in Overfill Prevention

From the company that brought you the industry standard OPW 61SO, OPW raises the standard with the introduction of the New 71SO Overfill Prevention Valve – breakthrough innovation that takes overfill prevention to a whole new level of overfill perfection.

The new 71SO is a two-stage, positive shut-off valve, providing completely automatic operation with no pre-checks to perform, no resets, and no overrides to be broken or abused. The valve closes when the tank level rises to 95% capacity and provides a special bypass valve so the tank can be filled to a maximum capacity of 98%. The 71SO is available for direct-bury and remote applications.

  • Eliminates curing issues due to hot or cold temperatures
  • Easier, quicker, installation
  • Higher quality, more reliable installation
  • Lower costs
  • Greater protection against fugitive emissions and pressure decay
  • Fastest flow rate in the industry

  • Completely Automatic Operation – does not rely on the alertness or speed of response of the delivery attendant for certainty of overfill prevention.
  • Keeps the Top of UST “Dry,” per EPA Requirements – eliminating possible leaks at loose bung fittings and the need for double containment on vent lines.
  • Does Not Rely on Pressure in the UST to Stop Flow – allowing faster fill times and reducing spill risk.
  • Speeds Delivery Operations – product flows unimpeded into the tank until the hose “kick” that accompanies the valve shut-off provides a clear signal that the liquid has reached the shut-off level.
  • Simple and Inexpensive Installation – in both two-point and coaxial fill applications, no additional excavation, manholes or vent piping are required.
  • Simple, Easy and Quick Installation – No excavation or special manholes required.
  • Economical – Costs a fraction of expensive, complicated and difficult-to-install valves.
  • Furnished Complete – Supplied with new upper and lower drop tubes, mounting hardware and thorough instructions for quick job site time.
  • Completely Automatic Operation – No pre-checks to perform, no resets, and no overrides to be broken or abused.
  • No Pressurization of the Tank – Operates directly from liquid level.
  • Will Accept a Dipstick for Gauging.
  • Retrofits Directly – For both new and existing tanks with 4" fill risers.
  • Quick Drain Feature – Automatically drains hose when head pressure is relieved.
  • No Epoxy Sealants Required!

Materials
Valve Body: Cast aluminium
Float: Nitrile rubber, closed cell foam
Valve: Aluminium 
Seals: Viton®
Upper & lower drop tube: Aluminium  
Plastic parts: Acetal
Hardware: Stainless steel

Product No. Description

Bury Depth

Tank Diameter

Upper Tube

Lower Tube Length

Overall Length.

Max. Riser Length

Max. Nominal Tank Dia.

Max. Actual Tank Dia.

Weight

ft.

m

ft.

m

in.

m

in.

m

in.

m

in.

m

in.

m

in.

m

lbs.

kg

71SO-400C Vapor-Tight Overfill Valve, 5 Ft. Bury, 8 Foot Tank

5

1.5

8

2.4

60

1.5

83

2.1

154 ¾

3.9

53 ½

1.4

96

2.4

107

2.7

16

7

71SO-410C Vapor-Tight Overfill Valve, 10 Ft. Bury, 10 Foot Tank

10

3.0

10

3.0

120

3.1

102

2.6

234 ¾

5.9

113 ½

2.9

120

3.1

126

3.2

25

11

71SO-420C Vapor-Tight Overfill Valve, 10 Ft. Bury, 12 Foot Tank

10

3.0

12

3.6

120

3.1

126

3.2

258 ¾

6.5

113 ½

2.9

144

3.7

150

3.8

26

12

71SO-4000 Non Vapor-tight Overfill Valve, 5 ft. Bury, 8 ft. Tank

5

1.5

8

2.4

60

1.5

83

2.1

155 ¾

3.9

53 ½

1.4

96

2.4

107

2.7

16

7

71SO-4010 Non Vapor-Tight Overfill Valve, 10 Ft. Bury, 10 ft. Tank

10

3.0

10

3.0

120

3.1

102

2.6

234 ¾

5.9

113 ½

2.9

120

3.1

126

3.2

25

11

71SOM-412C E85 Vapor-tight Overfill Valve

10

3.0

10

3.0

120

3.1

102

2.6

234 ¾

5.9

113 ½

2.9

120

3.1

126

3.2

38

17.3

71SO-TOOLCT 71SO Installation Tool

2.5

1

61JSK-4RMT Jack Screw Kit for Vapor-Tight Remote Applications

1.5

0.7

61JSK-4410 Jack Screw Kit for Composite Base Spill Buckets

1

0.5

61JSK-44CB Jack Screw Kit for Cast Iron Base Spill Buckets

1

0.5

71JSK-4RMT E85 Jack Screw for Remote-Fill Applications

1

0.5

71JSK-44MA E85 Jack Screw for Direct-Fill Applications

1.5

0.7

61JSK-4410 AND 61JSK-44CB Instruction Sheet Order Number: H15289M

 

Product No. Description

A- Upper Tube Length 

B- Lower Tube Length

C- Overall Length

Max. Riser Length

Max. Nominal Tank Dia.

Max. Actual Tank Dia.

Weight

in.

m

in.

m

in.

m

in.

m

in.

m

in.

m

lbs.

kg

71SO-400CT Testable Vapor-Tight Overfill Valve, 5 Ft. Bury, 8 Foot Tank 

60

1.5

83

2.1

154 ¾

3.9

53 ½

1.4

96

2.4

107

2.7

16

7

71SO-410CT Testable Vapor-Tight Overfill Valve, 10 Ft. Bury, 10 Foot Tank  

120

3.1

102

2.6

234 ¾

5.9

113 ½

2.9

120

3.1

126

3.2

25

11

71SO-420CT Testable Vapor-Tight Overfill Valve, 10 Ft. Bury, 12 Foot Tank

120

3.1

126

3.2

258 ¾

6.5

113 ½

2.9

144

3.7

150

3.8

26

12

 

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