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Bulletin 338 June 2021 <br />Relmiabi <br />Features <br />• Low air or nitrogen pressure, 8 to 24 psi (0.6 to 1.7 bar) <br />• Lightweight ductile iron body with compact trim <br />• External reset reduces setup and commissioning time <br />• Does not require priming water <br />• Available fully assembled, with or without control valve <br />Product Description <br />The Reliable Model DDX-LP Dry Pipe Valve System is a <br />hydraulically operated, mechanical latching clapper -type <br />valve designed for use as a primary control valve in a dry pipe <br />system. The pneumatic system pressure when using the Model <br />DDX-LP valve can be set substantially less than conventional <br />differential style dry valves. The following benefits are a direct <br />result of lower pneumatic pressure: <br />• Smaller, less expensive pneumatic sources <br />• Improved water transit times following operation of valve, <br />and in some cases, elimination of quick opening devices <br />• Low pressure makes the use of nitrogen more practical <br />In addition to these benefits, mechanical type dry pipe valves <br />are less susceptible to accidental tripping than conventional <br />differential dry pipe valves. <br />All sizes of the Model DDX-LP valve may be equipped with <br />the Reliable Model B1 Accelerator (P/N 6501200019; ordered <br />separately). The accelerator operates as an exhauster to hasten <br />the operation of the dry pipe valve. Please refer to Reliable <br />Technical Bulletin 323 for further information. <br />Model DDX-LP Dry Pipe Valve System Listings and Approvals <br />Model DDX-LP Low Pressure <br />Dry Pipe Valve System <br />LI <br />Valve Size <br />End Connection* <br />Pressure Rating <br />Listings & Approvals <br />2" (50mm), 2-1/2" (65mm), <br />& 3" (80mm) <br />Groove/Groove <br />250 psi (17,2 bar) <br />cULus, FM, CE, VdS, <br />76mm <br />Groove/Groove <br />250 psi (17,2 bar) <br />cULus, FM, CE, VdS <br />4" (100mm) <br />Groove/Groove <br />300 psi (20,7 bar) <br />cULus, FM, CE, VdS, -PCB <br />Flange/Groove <br />Flange/Flange <br />6" (150mm) <br />Groove/Groove <br />300 psi (20,7 bar) <br />cULus, FM, CE, VdS, LPCB <br />Flange/Groove <br />Flange/Flange <br />165mm <br />Groove/Groove <br />300 psi (20,7 bar) <br />cULus, FM, CE, VdS, LPCB <br />8" (200mm) <br />Groove/Groove <br />250 psi (17,2 bar) <br />cULus, FM, CE, VdS, LPCB <br />Flange/Flange <br />*Note: Grooved ends per ANSI/AWWA C606; flanged ends per ASME B16.5 Class 150 or ISO 7005-2 PN16 (specify). <br />www.reliablesprinkler.com <br />