8407 BROADWAY SECURE SPACE STORAGE 2026-01-02

TFP102O Page 5 of 20 Valve Accelerator (2-1/2, 3, 4, and 6 inch sizes) as detailed in Technical Data Sheet TFP1112. The VIZOR or the ACC-1 is used to reduce the time to valve actuation following the operation of one or more automatic sprinklers. In some cases the use of a quick opening device such as the VIZOR or the ACC-1 may be required to meet the requirements of the National Fire Protection Association to meet water delivery times. Operation The TYCO Model DPV-1 Dry Pipe Valve is a differential type valve that utilizes a substantially lower system (air or nitrogen) pressure than the supply (water) pressure, to maintain the set position shown in Figure 3A. The differ- ential nature of the DPV-1 is based on the area difference between the air seat and the water seat in combination with the ratio of the radial difference from the Hinge Pin to the center of the Water Seat and the Hinge Pin to the center of the Air Seat. The difference is such that 1 psi (0,07 bar) of system air pressure can hold approximately 5.5 psi (0,38 bar) of water supply pressure. Table B establishes the minimum required system air pressure that includes a safety factor to help prevent false operations that occur due to water supply fluctuations. The Intermediate Chamber of the DPV-1 is formed by the area between the Air Seat and Water Seat as shown in Figure 313. The Intermediate Chamber normally remains at atmospheric pressure through the Alarm Port connection and the valve trim to the normally open Automatic Drain Valve (Fig. 4, 5, or6). Having the Intermediate Chamber, Figure 313, open to atmo- sphere is critical to the DPV-1 Valve remaining set, otherwise the full resulting pressure of the system air pressure on top of the Clapper Assembly cannot be realized. For example, and assuming a water supply pressure of 100 psi (6,9 bar), if the system air pressure is 25 psi (1,7 bar) and there was 15 psi (1,0 bar) pressure trapped in the Intermediate Chamber, the resulting pressure across the top of the Clapper would only be 10 psi (0,7 bar). This pressure would be insufficient to hold the Clapper Assembly closed against a water supply pressure of 100 psi (6,9 bar). It is for this reason that the plunger of the Automatic Drain Valve must be depressed during several of the resetting steps, as well as during inspections, making certain that the Automatic Drain Valve is open. When one or more automatic sprin- klers operate in response to a fire, air pressure within the system piping is relieved through the open sprin- klers. When the air pressure is suffi- ciently reduced, the water pressure overcomes the differential holding the Clapper Assembly closed and the Clapper Assembly swings clear of the water seat, as shown in Figure 3C, This action permits water flow into the system piping and subsequently to be discharged from any open sprinklers. Also, with the Clapper Assembly open, the intermediate chamber is pres- surized and water flows through the alarm port (Ref. Figure 313) at the rear of the DPV-1 Valve to actuate system water flow alarms. The flow from the alarm port is also sufficient to close the otherwise normally open Automatic Drain Valve in the valve trim. After a valve actuation and upon sub- sequent closing of a system main control valve to stop water flow, the Clapper Assembly will latch open as shown in Figure 3D. Latching open of Continued on page 16 Maximum Water Supply Pressure, psi System Air Pressure Range, psi 20 10 60 15 - 23 80 20 - 28 100 25 - 33 120 30 - 38 145 35 - 43 165 40-48 185 45 - 53 205 50-58 225 55 - 63 250 60 - 68 TABLE B SYSTEM AIR PRESSURE REQUIREMENTS • 11 11 111 111 111 111 1111 1 T.T..7777E ....1RR1'.777E 7T.T.77,07MEon', h. iiii%iiiiiiiiiNEWAN 1 1 %iiiiiiiiiiiiiiiiN 1 = = — 1 ::::::::::::::::: �. • FANO. I7mom 4E227777 :EE22777 • oonnnoom wmonm.moo..•moo. 1 1 mmmmm11111mmmm111 rJIMINnoun N mommmmL1111mmmml onnnnonn rumm�numonrinmool 1 mmmmm11111mmmml SIIIIIIIm11G1111mm2-r" 111mmmml - .......nno. m .... uonnnoo. -.-.mom .n.. - n-...moor----. 1 1 iiiiiiiiiiim �,iiir • iiii oiiiiii1,1000ii • 1 nnnnm • non rnn �nnnnlmnn 1 1. , I I .. Te' �� . E7ee7777777Eee777 1 1 1 -.-.moon F. room . 1 momm.moor-moon mmmm-.m rmmmmmm..rrmmmm.no _I see___ sees 11� e e e 1 e _ e e — —Moon — — 11 ANNNNNNo 1 727777€7E2277P,:::::EEEE;Ts,;777777E7227777777E22777 1 1 . ii000,0111M i iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii mmmmr.11111mmm111111111r111111m1111111mmmmm11111mmmml 1 OMEN 111100F nnnnnnnnnnonnnnom ....e7...... rNN 777777 EE777�777777E7227777777E22777 -.,-......room-.....nnnlnm-.....n........n..... -000"No ... oo.ovnnmm�nnonnn000nnoo. 1 1 Lmmm.mrllmmmmm..L.1111111111mmmmr.Irmmmmmm..rlmmoon Ommmmllr.Ilmmmm11rn11111111111m1111111mmmmm11111mmmml 1 mmmmm11911mmmmlr91111111111111m1111111mmmmm11111mmmml 11 11 11 11 11 111 111 111 .1 1 .11 11 • • 01 FA