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PVS ADJUSTABLE PORT VALVES0 pages
CAPACITIES
PVS ADJUSTABLE PORT VALVES
NATURAL GAS
AIR
Q137
NOTES:
1. Capacities based on gas @ 0.60 s.g., air @ 1.0 s.g., and
68°F temperature.
2. Static pressure drop measured across full open valve, i.e.,
pointer at position 10 and adjusting screw turned in fully.
3. Maximum inlet pressure is 15 psig up to 4" valve size and
5 psig for 6" and larger valve size.
4. Maximum temperature is 200°F.
CORRECTION FACTORS
PRESSURE (GAS OR AIR Correction Factor C1)
Pressure
Drop (psig)
1
2
3
4
5
10
15
5
1.15
1.63
1.95
2.20
2.45
Inlet Pressure (psig)
10
1.29
1.80
2.25
2.50
2.75
3.70
15
1.42
1.95
2.45
2.85
3.00
4.05
4.70
TEMPERATURE (GAS OR AIR Correction Factor C2)
Temperature (°F)
Multiplier
68
1.00
100
1.03
150
1.07
200
1.12
Q140
SPECIFIC GRAVITY (GAS Correction Factor C3)
Gas
Specific Gravity
Multiplier
Coke
Oven
.40
1.224
Natural Gas
.59
.60
.61
1.007
1.000
.992
Blast
Furnace
1.02
.767
Propane
1.52
.628
Butane
2.01
.547
EXAMPLE:
Determine the corrected volumetric flow rate in standard cubic feet per hour for a
PVS2A20 (2") adjustable port valve for propane gas at 100°F having an inlet
pressure of 15 psig and a pressure drop of 5 psig.
Using the equation: Q(corrected) = C1 x C2 x C3 x Q(rated)
1. From the standard flow curve for Natural Gas (Q137) at 27.7 "w.c. pressure
drop, determine the rated flow: Q(rated) = 14,000 scfh.
2. From the Pressure correction factor table, determine the pressure correction
factor: C1 = 3.00
3. From the Temperature correction factor table, determine the temperature
correction factor: C2 = 1.03
4. From the Specific Gravity correction factor table, determine the specific gravity
correction factor for Propane: C3 = 0.628
Then, Q(corrected) = (3.00) x (1.03) x (0.628) x (14,000)
= 27,170 scfh of propane gas
In accordance with Hauck’s commitment to Total Quality Improvement, Hauck reserves the right to change the specifications of products without prior notice.
HAUCK MANUFACTURING CO., P.O. Box 90, Lebanon, PA 17042-0090 717-272-3051
Fax: 717-273-9882
2/04
www.hauckburner.com
APV-2
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