Dual Modular Safety Shutoff Valves with Two-stage operation
DMV-ZRD/602 Series
DMV-ZRDLE/602 Series
Description
The Two-Stage Dual Modular Valve (DMVZR) combines two safety shutoff valves in one compact housing, which can be wired independently or in parallel. Valve 2 incorporates two stages, which can be set attwodifferentfiringrates.Bothfiringrates arefieldadjustableandcanmodulatefrom high to low during burner operation.
Valve 1(V1) of the DMV-ZRD and DMVZRDLE series is fast opening and fast closing. Valve 2 (V2) is a two stage valve. V2 of the DMV-ZRD is fast opening, while V2 of the DMV-ZRDLE is slow-opening for smoother light-off. Max. flow adjustment onV2provides variable main flowonboth models.
Internal profiles and compact design optimize flow and provide a low pressure drop. Three body styles reduce inventory. Directly mounting the following accessories creates a compact valve train without additional piping: pressure regulator, high and low gas pressure switches, valve proving system, and vent line adapter.
Application
The DMV-ZR is recommended for industrial and commercial heating applications, where two automatic shutoff valves and modulating between two firing rates during burner operation are required. The DMV-ZR Dual Modular Valve two stage is suitable for dry natural gas, propane, butane, air and inert gases.
A “dry” gas has a dew point lower than +15 °F and its relative humidity is less than 60 %.
DMV-ZR.../602 Two normally closed safety shutoff valves in one housing.V1 and V2 are fast opening, fast closing. Two stage and adjustable max flow with V2.
DMV-ZRDLE.../602 Two normally closed safety shutoff valves in one housing.V1 fast opening, fast closing.V2 is a two stage, slow opening, fast closing valve. Adjustable max. flow and adjustable initial lift with V2.
Malaysia
