User Guide

V4943/V8943B,C,N; V4944/V8944B,C,L,N REGULATING DIAPHRAGM GAS VALVES
65-0214—5 6
Fig. 7. Capacity vs. pressure drop of LP Gas
curves for 1-1/4 in. valve.
Fig. 8. Capacity vs. pressure drop of LP Gas
curves for 1-1/2 in. valve.
Fig. 9. Capacity vs. pressure drop of LP Gas
curves for 2 in. valve.
To size two identical valves piped in series:
1. Find the cf/h for the type of gas used.
2. Consider both valves as one unit. Determine the
maximum pressure drop across the one unit.
3. Find the pressure drop across the first valve by
assuming it to be 45 percent of the total pressure drop.
4. Find the valve size from Fig. 2–9.
5. The second valve will be the same size as the first valve.
INSTALLATION
WARNING
Explosion hazard.
Can cause serious injury, death or equipment
damage.
Installation and service by trained professionals only.
Exceeding the pressure rating or use of unspecified
fuel can lead to improper operation of the valve and
can create an explosion hazard. Property damage,
severe bodily injury or death can result.
When installed in the Commonwealth of
Massachusetts, the installation and servicing of this
product must be done by a licensed gas fitter or
plumber.
Consult specifications before installing valve.
When Installing this Product...
1. Read these instructions carefully. Failure to follow them
could damage the product or cause a hazardous
condition.
2. Check the ratings given in the instructions and on the
product to make sure the product is suitable for your
application.
M23381
1.25 INCH V4/8944C/L REGULATION AREA
0.1
1
10
100
100 1000 10000
FLOW LP GAS (CFH)
PRESSURE DROP (IN. WC)
ANY PO
PO < 5.5 IN.
M23382
1.5 INCH V4/8944C/L REGULATION AREA
0.1
1
10
100
100 1000 10000
FLOW LP GAS (CFH)
PRESSURE DROP (IN. WC)
ANY PO
PO < 8 IN.
M23383
2 INCH V4/8944C/L REGULATION AREA
0.1
1
10
100
100 1000 10000
FLOW LP GAS (CFH)
PRESSURE DROP (IN. WC)
ANY PO
PO < 8 IN.