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Overfill Prevention Valves

The Model 71 Overfill Prevention Valve provides a mechanical method of automatic fuel oil shut-off to prevent overfilling of underground storage tanks during a gravity filled delivery.

The Model 61F-Stop Overfil Prevention Valve provides a mechanical method of positive fuel oil shut-off to prevent overfilling of above ground storage tanks during a pressurized fill (pump -in fill) delivery. 

Overfill Prevention Valve - Model 71
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Overfill Prevention Valve - Model 71

Application

The Model 71 is for use on underground diesel or No. 2 fuel oil storage tanks where the tank is gravity filled (i.e.not applicable to “pumped-in fill” applications). The Overfill Prevention Valve includes upper and lower drop tube sections. The upper section is flared, rests on the top of a 4" fill pipe, and is secured in place by the tight fill adaptor. The lower drop tube section extends into the tank and is cut off at either 6 inches from the tank bottom, or at the dimension required by local codes. The Overfill Prevention Valve is installed between the drop tube sections. The valve can be installed from outside the tank without excavation (installation is as easy as changing drop tubes).

The Model 61F-Stop  provides a mechanical method of positive fuel oil shut-off to prevent overfilling of above ground storage tanks during a pressurized fill (pump-in fill) delivery.  "The Stopper" threads into the fill opening and is an integral part of the fill tube.  The Preferred 61F-Stop is fully adjustable to allow for easy installation in a new or existing aboveground tanks of various heights and storage capacities. 

Features

  • Provides A Mechanical Method Of Automatic Fuel Oil Shut Off
  • Cast Aluminum Body
  • Easy Installation

Overview

Model 71

The Model 71 provides a mechanical method of automatic fuel oil shut-off to prevent overfilling of underground storage tanks during a gravity filled delivery.  It is designed to satisfy EPA regulations covering overfill protection, “a device that will automatically shut off the flow of oil into the tank when the tank is no more than 95% full.”*  It is recommended for installation in conjunction with a Preferred Fil-A-Larm System, which provides a pre-alert audible/visual alarm and shut-off notification to the fill operator, prior to the actuation of the Model 71.

The Model 71 is for use on underground Diesel or No. 2 fuel oil storage tanks when the tank is gravity filled (i.e. not  applicable to “pumped-in fill” applications).  The Overfill Prevention Valve includes upper and lower drop tube sections.  The upper section is flared, rests on the top of a 4" fill pipe, and is secured in place by the tight fill adaptor.  The lower drop tube section extends into the tank and is cut off at either 6 inches from the tank bottom, or at the dimension required by local codes.  The Overfill Prevention Valve is installed between the drop tube sections.  The valve can be installed from outside the tank without excavation (installation is as easy as changing drop tubes).

Valve Body: Cast Aluminum

Float:  Nitrile Rubber, Closed Cell Foam

Valve: Aluminum

Seals: Viton

Upper and Lower Drop Tubes: Aluminum

Caution: On existing tanks, the drop tube may be held in the tank coupling below the riser pipe.  On these installations, the existing drop tube must be removed to accommodate valve operation.

Operation: The Overfill Prevention Valve is a float operated, two stage shut-off valve system.  It is installed as an integral part of a 4" drop tube assembly.  When the fuel oil level increases to approximately 95% of tank capacity (Level “A”), the main valve closes.  A small bypass valve remains open to permit delivery hose draining at a rate of approximately 2-5 GPM.  If the oil level reaches Level “B” (5 inches above Level “A”), the bypass valve closes to prevent accidental or intentional overfilling.
 
Caution: Model 71 Overfill Prevention Valve is for use with “gravity fill” systems only, and is not intended for “pumped-in fill” applications.  It is for diesel or No. 2 fuel oil only.

Model 61F-Stop

Operation: The Model 61F-Stop for use with above ground storage tanks is a single-action stopper, complete shut-off valve.  When the liquid level rises to the specified tank capacity, the valve mechanism is released and automatically stops the flow of the product.  Any excess product left between the valve and the fuel delivery coupler is drained into the tank through internal drain vents.  The drain vents on the 61F-Stop act as an Anti-Syphon device, by introducing air/vapor into the fill line and thereby preventing the tank from being exposed to a syphon condition, resulting from a broken or leaking fill pipe.  Minimum flow of 25 GPM is required for valve to function properly. 

Valve Body: Cast Aluminum

Float: Closed-cell Buna-N

Poppet: Cast Aluminum, hard coated

Cam: Stainless steel

Follower: Brass

Shaft: CRS zinc plated

Bearing: Sintered Bronze

Caution: Model 61F-Stop Overfill Prevention Valve is for use with above ground "pumped in" storage tanks.

Specification

Provide and install, in the tank fill pipe, a  Model 71 Overfill Prevention Valve or Model 61F-Stop Overfill Prevention Valve.  The unit shall have a float operated two stage valve system.  The main valve shall shut-off at approximately 95% of the tank capacity leaving a small bypass valve open to permit hose drain down.  At 5" above main valve shut-off, the bypass valve will close completely to shut off all flow.