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Do control pressures have to be applied at all times?

April 26, 2017applied CONTROL pressures times

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Do control pressures have to be applied at all times?

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All DSA series, ZOC16TC, and ZOC17 modules are normally open valves. That is, no control pressure is required to put the module in the Operate mode. Control pressures are required to switch the valves to the other modes of operation. The control pressure used for these modules must be 85 to 105 psi depending on the pressure range of the module.