US Patent No: 7,814,983
Number of patents in Portfolio can not be more than 2000
Dry pipe valve for fire protection sprinkler system
Stats
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Oct 19, 2010
Issued date -
Jan 7, 2008
filing date -
11/970,226
serial no -
In Force
status
Importance
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Abstract
A fire protection system comprises a supply pipe having a first fluid pressurized to a first pressure and a network of pipes having a plurality of sprinklers. The network of pipes have a second fluid being pressurized to a second pressure at approximately 5.5 times the first pressure. The system further comprises a dry pipe valve including a body defining a passage extending along a longitudinal axis between an inlet coupled to the supply pipe and an outlet coupled to the network of pipes. The inlet has an inlet diameter of approximately WD inches and a seat disposed in the body has a seating surface with a diameter AD approximately less than two times WD inches. The dry pipe valve further includes a clapper pivotable about an axis orthogonal to the longitudinal axis between a first position occluding the passage when the ratio of the second pressure to the first pressure is at least 5.5 and a second position permitting fluid flow through the passage when the ratio is less than 5.5.
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First Claim
Related Publications
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 4,854,342 Clapper seal for dry pipe valve | 16 | 1988 | |
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| 4,706,706 Check valve and a seal for a check valve | 27 | 1986 | |
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| 7,104,333 Dry pipe valve for fire protection sprinkler system | 3 | 2003 | |
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| 6,840,457 Wet-pipe sprinkler system, method of supplying water and dealing with water leak in the sprinkler system | 5 | 2002 | |
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| 6,848,513 Fire protection valve trim assembly system | 12 | 2003 | |
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| 6,666,277 Low pressure pneumatic and gate actuator | 7 | 2001 | |
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| 4,321,942 Backflow preventer valve | 4 | 1980 | |
| 4,552,221 Dry-head or deluge-type valve for fire-extinguishing systems | 9 | 1983 | |
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 3.5 Year Payment | $1600.00 | $800.00 | $400.00 | Apr 19, 2014 |
| 7.5 Year Payment | $3600.00 | $1800.00 | $900.00 | Apr 19, 2018 |
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Apr 19, 2022 |
| Fee | Large entity fee | small entity fee | micro entity fee |
|---|---|---|---|
| Surcharge - 3.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge - 7.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge - 11.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
| Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |