PRE-ACTION MODEL 68 DE EL-MR
Single or Double-Interlock Pre-Action, Electrically Actuated, Manual Reset Valve, Electrically controlled, single or double-interlock, pre-action valve, actuated by the pipeline pressure. The valve is closed in its normal, set position and opens when a 2w solenoid valve is energized. The electric interlock functionality is controlled through the fire control panel. The valve must be manually reset following automatic actuation. An emergency manual release valve is fitted as standard.
FEATURES & BENEFITS
High pressure (PN25/375psi), high ﬂow systems
Automatic or manual emergency actuation
Industrial & commercial ﬁre suppression
Hazardous, ﬂammable & explosion classiﬁed area ﬁre suppression
Superior design featuring exceptionally low pressure losses at high ﬂow rates
Low lifelong maintenance costs due to straightforward design
Applicable for water, seawater & foam
Out of box fully assembled & tested valves
Factory trimmed for vertical & horizontal installations without modiﬁcation
Extensive valve & trim materials selection and corrosion protection coating
CERTIFICATION & COMPLIANCE
• ANSI FCI 70-2 Class VI seat leakage class
• UL listed under VLFT category
• Fire tested to EN ISO 6182-5:2006 (2”-6” only)
• Lloyd’s Register & ABS approvals
Cold Storage Protected Areas
High Rise Buildings & Offices
Archives, Museums, Libraries & Water Sensitive Depots
The basic control valve  used in this pre-action system is a direct-sealing elastomeric diaphragm, hydraulically operated control valve engineered specifically for fire protection systems.
In the standby position, the pre-action valve is held closed by the upstream water pressure, trapped in the valve’s control chamber. The water pressure enters the control chamber through the priming line ball valve , a Y-type strainer , a check valve  and a DMR (Manual Reset Latching Device) .
Under fire conditions, a fire alarm control panel (F&G panel) energizes the 2/2-way N.C. Solenoid  (or de-energizes the coil of a continuously energized ED 100% normally open solenoid for SIL 3-4 rated systems).
In single-interlock systems the solenoid is energized upon activation of the detection system. In double-interlock systems the solenoid is energized upon activation of the detection system and a drop in supervisory pressure, following bursting of one (or more) of the automatic sprinklers. When this happens, water is drained the pre-action valve’s control chamber through the 2/2-way N.C. Solenoid. The pre-action valve opens instantly and allows water to flow the pipeline and through any open sprinklers over the protected area.
Pressure switches on the pre-action valve’s downstream port  and the check valve’s downstream port  provide electrical indication to the fire alarm control panel of rising water pressure (the valve has opened) and drop in air (or gas) pressure (one or more sprinklers have burst).
Manual emergency actuation is enabled by opening the emergency manual activation valve . The pre-action valve opens instantly and allows water to flow the pipeline and through any open sprinklers over the protected area.
When the valve trips open, the DMR isolates the control chamber the upstream pressure source. Reconnecting the upstream pressure to enable the pre-action valve to close can only be achieved by pressing the DMR’s knob
1) Refer to materials selection guidelines, Engineering Data - Materials: Ductile Iron A-536 65-45-12; Cast Steel A-216 WCB; Cast Steel A-352 LCB; Austenitic
Stainless Steel A-351/CF8M; Super Duplex 2507; Nickel-Aluminum-Bronze B-148 UNS C95800
(2) Consult factory