Buying Guide

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Revised 7/20/2018
RATED
BOILER
HP
@ 75%
BOILER
CAPACITY
(LBS/HR)
OPERATING PRESSURE (PSIG)
10 50 75 100 125 150 175 200 225 250
100 2588 3" 2½" 2½" 2½" 2½" 2½" n/a
125 3234 4" 3" 2½" 2½" 2½" 2½" n/a n/a
150 3881 4" 3" 3" 2½" 2½" 2½" n/a n/a n/a n/a
200 5175 4" 4" 3" 3" 3" 3" n/a n/a n/a n/a
250 6469 4" 4" 4" 3" 3" 3" n/a n/a n/a n/a
300 7763 6" 4" 4" 4" 4" 3" n/a n/a n/a n/a
350 9056 6" 4" 4" 4" 4" 4" 4" n/a n/a n/a
400 10350 6" 4" 4" 4" 4" 4" 4" 4" 4" 4"
500 12938 6" 6" 4" 4" 4" 4" 4" 4" 4" 4"
600 15525 8" 6" 6" 4" 4" 4" 4" 4" 4" 4"
700 18113 8" 6" 6" 6" 6" 4" 4" 4" 4" 4"
750 19406 8" 6" 6" 6" 6" 6" 4" 4" 4" 4"
800 20700 6" 6" 6" 6" 6" 6" 6" 4" 4"
900 23288 8" 6" 6" 6" 6" 6" 6" 6" 6"
1000 25875 8" 8" 6" 6" 6" 6" 6" 6" 6"
1100 28463 8" 8" 8" 6" 6" 6" 6" 6" 6"
1200 31050 8" 8" 8" 8" 6" 6" 6" 6" 6"
1300 33638 8" 8" 8" 8" 6" 6" 6" 6" 6"
1400 36225 8" 8" 8" 8" 8" 6" 6" 6" 6"
1500 38813 8" 8" 8" 8" 8" 6" 6" 6"
1600 41400 8" 8" 8" 8" 8" 8" 6" 6"
1800 46575 8" 8" 8" 8" 8" 8" 8"
2000 51750 8" 8"
8" 8" 8" 8"
F-869 Automatic Stop Check Valve Sizing Guide
This chart assumes that the boiler will always run between 50% and 100% of maximum capacity (lbs/hr) and average an output of 75% of boiler capacity.
RATED
BOILER
HP
@ 50%
BOILER
CAPACITY
(LBS/HR)
OPERATING PRESSURE (PSIG)
10 50 75 100 125 150 175 200 225 250
100 1725 2½"
125 2156 3" 2½" 2½"
150 2588 3" 2½" 2½" 2½" 2½"
200 3450 4" 3" 3" 2½" 2½" 2½" n/a
250 4313 4" 3" 3" 3" 3" 2½" n/a n/a n/a n/a
300 5175 4" 4" 4" 3" 3" 3" n/a n/a n/a n/a
350 6038 4" 4" 4" 4" 3" 3" n/a n/a n/a n/a
400 6900 6" 4" 4" 4" 4" 3" n/a n/a n/a n/a
500 8625 6" 4" 4" 4" 4" 4" 4" n/a n/a n/a
600 10350 6" 4" 4" 4" 4" 4" 4" 4" 4" 4"
700 12075 6" 6" 4" 4" 4" 4" 4" 4" 4" 4"
750 12938 6" 6" 6" 4" 4"
4" 4" 4" 4" 4"
800 13800 8" 6" 6" 4" 4" 4" 4" 4" 4" 4"
900 15525 8" 6" 6" 6" 4" 4" 4" 4" 4" 4"
1000 17250 8" 6" 6" 6" 6" 4" 4" 4" 4" 4"
1100 18975 6" 6" 6" 6" 6" 4" 4" 4" 4"
1200 20700 6" 6" 6" 6" 6" 6" 6" 4" 4"
1300 22425 8" 6" 6" 6" 6" 6" 6" 6" 6"
1400 24150 8" 8" 6" 6" 6" 6" 6" 6" 6"
1500 25875 8" 8" 6" 6" 6" 6" 6" 6" 6"
1600 27600 8" 8" 8" 6" 6" 6" 6" 6" 6"
1800 31050 8" 8" 8" 8" 6" 6" 6" 6" 6"
2000 34500 8" 8" 8" 8" 8" 8" 6" 6" 6"
This chart assumes that the boiler will always run between 25% & 100% of maximum capacity (lbs/hr) and average an output of 50% of boiler capacity.
NOTES: 1. Automatic Stop Check Valve sizing must be sized only to the boiler steam demand, not the boiler nozzle outlet piping size.
2. Specific operating conditions may require slightly different Automatic Stop Check Valve sizing requirements for any given boiler system.
3. Automatic Stop Check Valve sizing is based on a target of 2 PSI pressure drop across the valve for optimum flow.
4. Please contact NIBCO Technical Services for guidance if operating conditions differ from conditions stated in #2 above.
5. This chart is to be used to assist in sizing Automatic Stop Check Valves, NIBCO assumes no liability for incorrect sizing.