SPECIFICATIONS • INSTALLATION
4. For gases with specific gravities other than 0.64,
multiply the burner cfh by the proper conversion factor:
Type of Gas
5. Use the corrected capacity in cf/h when determining
the gas valve size in Fig. 1.
6. Determine the maximum pressure drop across the
valve and draw a horizontal line at this pressure in Fig. 1.
7. Draw a vertical line in Fig. 1 at the capacity (cf/h)
previously determined. Use the corrected capacity for a gas
with a specific gravity other than 0.64.
IMPORTANT: The V5055 Valve is designed to provide
control of gaseous fuel (natural and LP gas) flow in
applications in which there is minimal exposure to
water. V5055 Valves used in maritime, beverage, food
processing, outdoor and other installations in which
occasional exposure to water is experienced may be
subject to valve stem and spring corrosion. The pres-
ence of corrosion decreases the operating life of the
valve. V5055 Valves used in such installations should
be inspected at least annually and should have the
valve bonnets replaced if corrosion is noted.
A V4055 Valve Actuator with a NEMA 4 rating is also
recommended for such installations. The water-tight
design of the NEMA 4 rated V4055 Actuator prevents
water from entering the V4055 valve stem and spring
chamber through the actuator. Under certain condi-
tions, some water may be retained by the external
upper portion of the valve body. The retained water is
effectively excluded from the valve stem and spring
chamber by a functional seal that is incorporated into
the NEMA 4 rated actuator.
WHEN INSTALLING THIS PRODUCT...
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazardous
2. Check the ratings given in the instructions and on
the product to make sure the product is suitable for your
3. Installer must be a trained, experienced, flame safe-
guard control technician.
4. After installation is complete, check out product
operations as provided in these instructions.
sp gr (average) Multiply cf/h by
8. Use the valve size at the intersection of the horizontal
and vertical lines. If the intersection is between valve sizes,
use the next higher size to the right.
TO SIZE TWO IDENTICAL VALVES PIPED IN
1. Find the cf/h for the type of gas used.
2. Consider both valves as one unit. Determine the total
maximum pressure drop across the unit.
3. Find the pressure drop across the first valve by assum-
ing it to be 45 percent of the total pressure drop.
4. Find the valve size from Fig. 1.
5. The second valve will be the same size as the first
1. Turn off gas supply before starting installation.
2. Disconnect power supply for valve actuator
before beginning installation to prevent electri-
cal shock and equipment damage.
3. Be sure the valve is installed so the arrow on the
valve points in the direction of gas flow. (Gas
pressure helps to close the valve.)
Install the valve in the gas supply line downstream from
the pressure regulator. The valve and actuator may be
mounted in any position that allows sufficient clearance for
installation and for repair or replacement.
1. The valve position indicators should be easily visible
with the valve and actuator in the final position.
2. The final position of the valve and actuator must allow
for damper linkage, if used.
IMPORTANT: Allow room for turning the valve body
(actuator not attached) onto the gas piping. Swing
dimensions, measured from the center of the pipe are:
3/4 through 1-1/2 in. valves: 4 in. (101.6 mm).
2 through 3 in. valves: 5 in. (127.0 mm).
4 in. valves: 7 in. (177.8 mm).
MOUNTING (Figs. 4 through 6)
If flow is not in the direction of the arrow on the
valve body, the valve may not shut off.