Posted on July 16, 2016


Automatic sprinkler model 39

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  1. The region 44 cooperatively defined by the seat body 28 and the clapper diaphragm retaining plate 39,generally between the air valve seat 30 and seal 40 and the water valve seat 32 and seal 42, is maintained at ambient pressure, and water leakage pastwater valve seat 32 and seal 42 is released through drain port 46..

  2. This invention relates to dry pipe automatic fire protection sprinkler systems..

  3. FIG. 22 is a side sectional view of the clapper diaphragm retaining plate of FIG. 20, taken at the line 22—22 of FIG. 21; and..



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  1. Mears, in U.S. Pat. No. 4,128,128, shows a diaphragm actuated sprinkler head in which the diaphragm carries a hollow cylindrical valve which ismovable upwardly against the downward force of a spring 52 and which is actuated upwardly by water pressure available through the branch waterpassageway 42 and control passageway 46, when the pilot valve of the pilot valve assembly 40 is opened by the bimetalic disc 62..

  2. FIG. 20 is a perspective view of a clapper diaphragm retaining plate for the dry pipe valve of FIG. 1;..

  3. Many dry pipe valves are of the differential-type, single clapper construction. These center differential pressure valves are designed with a drysystem seat and a water supply seat concentrically located with their axes at an equal distance from the center of the clapper hinge pin. As seen fromthe following equation, the differential ratio is the relationship of the air seat area divided by the water seat area:DF=(AD/WD)2*L1/L2AD=√{square root over (DF*WD2)}..


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  1. Referring now to FIG. 24, a typical dry pipe fire protection sprinkler system 100 equipped with a differential-type dry pipe valve 10 of the inventionwill now be described. A dry pipe fire protection sprinkler system 100 is typically employed for protection of a warehouse or other structure 102located in a geographical region subject to temperatures below freezing and having unheated areas 104 that must be protected against fire. The system100 is connected to a reliable external source of water, e.g. a city main 106, through a fire main 108, riser 110, and check valve 112..

  2. FIG. 3 is a top view of the dry pipe valve of FIG. 1; and..

  3. The clapperassembly 56 in dry pipe valve 10 is then allowed to return to its closed position by depressing actuator 53 of latch assembly 52 to rotate pivot arm50 and release the clapper assembly. After any open sprinkler has been replaced, the system of piping 116 is recharged, and water flow to the inlet 14of the dry pipe valve 10 is restored..