Double Interlock Pre-action, Electric Release System PC4-FP-400E-7BM
| Features and Benefits■ Latch open - Closes only upon local reset ■ Factory pre-assembled trim – Out-of box-quality ■ In-line serviceable – Minimal down time ■ In-line Check Valve – intermediate vented chamber- Anti flooding ■ One-piece molded elastomeric moving part – No maintenance required Optional Features ■ Air Maintenance Device (AMD) ■ Water motor alarm ■ Valve Position Single/Double Limit Switches |
Description
The BERMAD Model PC4-FP-400E-7BM Double Interlock Pre-Action, Electric-Electric Release System is suitable for use in systems requiring that water be kept out of the sprinkler piping until an electric detecting device and a sprinkler have both been activated. Electric-Electric double interlock systems include automatic sprinklers attached to a dry sprinkler piping system, along with a supplementary electric detection system wired to a Cross-Zone releasing control panel, and an Electric Supervised System of low air pressure in the sprinkler system piping. The Double Interlock Pre-Action System admits water into the sprinkler piping only when both the detection device and the supervised systems simultaneously signal the control panel to trigger the solenoid valve. An anti-flooding feature is provided by utilizing an in-line check valve, which creates an intermediate vented chamber using a Normally Open drip-check.
Operation
In the SET position, the line pressure supplied to the main valve’s control chamber [1] via the priming line [2] and through an EasyLock Manual Reset [3], is trapped by the Easy Lock internal check valve, by a closed Solenoid Valve [4] and by a closed Manual Emergency Release [5]. The trapped pressure holds the main valve’s diaphragm and plug against the valve seat [6], sealing it bubble tight. The piping system is filled with supervised low air pressure to ensure all automatic sprinklers [F] are sealed. An intermediate vented chamber is created by an in-line swing check valve [7], and a Normally Open drip-check [8]. In the event of FIRE, upon activation of both the electric detection system (E) and the low-air pressure switch [9], that is activated by the air pressure drop in the system piping due to opened sprinkler head (F). The Cross-Zone Releasing control panel [C] triggers the Solenoid Valve to open, water pressure is then released from the main valve’s control chamber. The EasyLock prevents line pressure from entering the control chamber, allowing the pre-action valve to latch open and water to flow into the system piping and to alarm device [10].
Engineer Specifications
■ The pre-action valve shall be a UL-Listed, electrically controlled elastomeric type globe valve with a rolling-diaphragm.
■ The valve shall have an unobstructed flow path, with no stem guide or supporting ribs.
■ Valve actuation shall be accomplished by a fully peripherally supported, one-piece balanced rolling-diaphragm, vulcanized with a rugged radial seal disk. The diaphragm assembly shall be the only moving part.
■ The valve shall have a removable cover for quick in-line service enabling all necessary inspection and servicing.
■ The control trim materials shall consist of St.St. 316 tubing and fittings, and plated brass accessories, including in line swing check valve with resilient seal, local EasyLock Manual Reset, 2-Way Solenoid Pilot Valve, Y strainer, Automatic drip check with manual knob and Manual Emergency Release.
■ The control trim shall be supplied as an assembly, pre-assembled and hydraulically tested at an ISO 9000 and 9001 certified factory.
■ The Double Interlock Pre-action, Electric-Electric Release System shall consist of pressure switch low and shall be wired to a Cross-Zone releasing panel.
