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Dry pipe valves controlling systems having a capacity of more than 500 gallons shall be provided with a quick opening device. The quick opening device shall be located as close as possible to the dry pipe valve while providing protection to the restriction orifice and other operating parts against submergence in water resulting from system drainage or priming. A soft disc globe or angle valve shall be installed in the connection between the dry pipe valve and the quick opening device. A check valve shall be provided also in the connection between quick opening device and the intermediate chamber of the dry pipe valve to prevent the escape of water if the dry valve should trip with the quick opening device disconnected. If the quick opening device requires a pressure feedback from the intermediate chamber, a valve type that will clearly indicate whether it is opened or closed shall be permitted in place of the check valve.
(Prior code § 91-32; Amend Coun. J. 10-30-96, p. 31216, § 1)