71SO Segmented Overfill Prevention Valve

The OPW 71SO Segmented Overfill Valve is designed with the same reliability, quality materials and shut-off features trusted in the traditional OPW 71SO Overfill Prevention Valve, while also making shipping and storage easier. The segmented design allows for more compact packaging and cost-efficient transport, reduces potential damage during transit and makes storage easier.

The 71SO Segmented Overfill Prevention Valve doesn't require special manholes and is easy to install without breaking concrete. The four 5' segments can be customized to fit 8-12' tank diameters, with an overall length exceeding 223".

Easier, more cost-effective shipping and storage
Easy and economical installation (tube joiners included)
Non-vapor-tight valves currently available; vapor-tight valves coming soon
Compatible up to B100 (non-E85 versions)

Used for gravity filling, the OPW 71SO Segmented Overfill Prevention Valve is a two-stage shut-off valve designed to prevent the overfill of underground storage tanks by providing a positive shut-off of product delivery. 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.

When shut off occurs at 95%, operators typically quit filling the tank, disconnect, and drain the delivery hose. If the delivery is not stopped and the liquid rises to about 98% of the tank's capacity, the bypass valve closes completely. No additional liquid will flow into the tank until the level drops below a reset point.

71SO Overfill Prevention Valves Brochure

Features & Benefits

Segmented Tubes

71SO Segmented Overfill Prevention Valve

Materials

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

Advantages of Overfill Prevention Compared to Overfill Warning Systems:

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.

Features

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. Also, no resets and no overrides to be broken or abused.
No Pressurization of the Tank – Operates directly from liquid level.
Accommodates Inventory Measurement – Will accept a dipstick for gauging.
Retrofits Directly – For both new and existing tanks with 4" fill risers.
Quick Drain Feature – Automatically drains the hose when head pressure is relieved.
No Epoxy Sealants Required – Eliminates curing issues due to hot or cold temperatures and provides greater protection against fugitive emissions and pressure decay.

Listings & Certifications

Ordering Specifications

Replacement Parts

Notes & Warnings

NOTE: The OPW 71SO Segmented Overfill Prevention Valve can be adjusted to shut off at any desired tank capacity. Please contact the Authority Having Jurisdiction (AHJ) and review local, state, and national codes to determine the regulatory requirements governing shut-off capacity in your region, as well as take into account other considerations such as extreme tank tilt. In all cases, the upper tube must protrude into the tank at least 6 1/2" to ensure that the valve can shut off flow into the tank completely before the top of the tank is wetted as per EPA requirements.

IMPORTANT

To prevent product spillage from the Underground Storage Tank (UST), properly maintained delivery equipment and a proper connection at the tight-fill adaptor are essential. Delivery personnel should be managed and trained to inspect delivery elbows and hoses for damaged and missing parts. They should always make certain there is a positive connection between the adaptor and elbow. If delivery equipment is not properly maintained, or the elbow is not securely coupled to the adaptor, a serious spill may result when the OPW 71SO Segmented Overfill Prevention Valve closes, causing a hazard and environmental contamination. NOTE: The Segmented Overfill Prevention Valve is designed for use on tight-fill gravity drop applications only. Do not use for pressure fill applications.

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71SO Overfill Prevention Valves Brochure

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71SO Segmented Overfill Prevention Valve

Features & Benefits

Segmented Tubes

Materials

Advantages of Overfill Prevention Compared to Overfill Warning Systems:

Features