The 61ƒSTOP-1000 is an overfill prevention valve for
use with an aboveground storage tank (AST) where prod-
uct is pumped from a transport vehicle into the AST.
The valve is designed to stop the flow of product when
the tank is filled to a pre-determined level.
WARNING: THE 61ƒSTOP IS DESIGNED FOR
TIGHT-FILL APPLICATIONS AND MUST ONLY
BE USED WITH APPROPRIATE CONNECTIONS.
FAILURE TO PROPERLY CONNECT THE
DELIVERY HOSE OR DISCONNECTING A
LIQUID-FILLED LINE WILL RESULT IN AN
EXTREMELY HAZARDOUS SPILL WHICH MAY
RESULT IN PERSONAL INJURY, PROPERTY
DAMAGE, FIRE, EXPLOSION OR WATER AND
SOIL CONTAMINATION.
INSTALLATION
The 61ƒSTOP-1000 is packaged with a 2" diameter,
4" long pipe nipple that is loosely threaded in the inlet
of the valve. A collar for attaching the assembly to a
4" riser is loosely assembled over the 4" long nipple.
A special adapter with a crossbar is loosely threaded on
the inlet end of the nipple. This nipple may be used on
single wall tanks if dimension “B” (see illustration) is
between 3" and 6". If “B” dimension is 5"- 6", push
nipple down until the adaptor meets the collar.
However, the ullage will be affected by the length
of dimension “B”.
For “B” dimensions greater than 6", a different
2" diameter nipple length will need to be determined.
See illustration for determining dimension “C”.
Instructions for installations where the
4" long nipple is adequate, simply proceed
with the following steps:
1. Remove the special adapter from the inlet
of the nipple.
2. Remove the collar and nipple from the inlet
of the valve.
CAUTION!
CARE MUST BE TAKEN TO PREVENT
DAMAGE TO THE FLOAT AND LINKAGE.
3. Apply a gasoline-resistant sealant to the outlet end
of the nipple and install it into the inlet of the valve.
4. Apply a gasoline-resistant sealant to the inlet end
of the nipple and thread the adapter in place.
5. Tighten the three (3) set screws in the collar.
6. Stand the valve upright, lift the float and release
it to make sure it works freely.
OPW
®
H-12676-M
February, 2000
Installation
Instructions
OPW 61ƒSTOP-1000 & -100M “THE STOPPER”
7. Apply a gasoline-resistant sealant to the threads of
the 4" fitting in the top of the tank. Slide the valve
assembly through the fitting.
8. Thread the collar onto the fitting. The valve is now
ready for operation.
Instructions for installations where a longer, 2"
diameter nipple (dimension “C”) must be used, i.e., a
nipple length greater than 4". See Illustration for
determining length of nipple.
If dimension “B” is greater than 6", proceed
with the following steps:
1. Determine dimension “C” (length of 2" diameter
nipple) by adding dimension “A” and “B” and
subtracting 8": A+B - 8"= C.
Note: “A” dimension
must be a minimum of 7".
2. Cut and thread the new nipple which corresponds
to dimension “C”.
3. Remove adapter from the inlet of the existing
nipple and slide the collar off the nipple.
4. Remove the existing nipple from the valve.
5. Apply a gasoline-resistant sealant to one end of the
new nipple and thread it into the inlet of the valve.
6. Apply a liberal amount of grease to the o-ring in the
collar and slide the collar onto the nipple with the
4" threaded end toward the valve for a distance of
1
1
⁄
4
". Tighten the 3 set screws.
7. Apply a gasoline-resistant sealant to the inlet end of
the nipple and thread the adapter in place.
8. Stand the assembly upright, lift the float and
release it to make sure it works freely.
9. Apply a gasoline-resistant sealant to the threads of
the 4" fitting in the top of the tank and slide the
valve assembly through the fitting.
10. Thread the collar onto the fitting. The valve is
now ready for operation.
Note: OPW recommends using a drop tube, such
as the OPW 61FT Series with all 61ƒSTOPs.
OPERATING PROCEDURES
CAUTION: READ THESE INSTRUCTIONS
CAREFULLY AND COMPLETELY BEFORE
OPERATING THIS DEVICE.
The 61ƒSTOP-1000 “The Stopper” is provided
a special adaptor which requires the appropriate
attachment for connection to achieve a tight fit.
CAUTION!
OPERATIONS PROCEDURES CONTINUED
ON NEXT PAGE.
