PRE-ACTION MODEL 68 DE EL PORV-DN-MR
Double-Interlock Pre-Action, Manual Reset, Electro-Pneumatic Release System ,Electrically and pneumatically, pilot controlled, double-interlock, pre-action valve, actuated by the pipeline pressure. The valve is closed inits normal, set position and opens when the pressure drops in a gas pressurized supervisory pilot line, sensed by the relay valve, and the solenoid valve is energized. 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
• Fire tested to EN ISO 6182-5:2006 (2”-6” only)
• UL listed under VLFT category
• 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) .
The pre-action valve opens automatically when both conditions below occur simultaneously:
1. 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).
2. The pressure in the dry (pneumatically-pressurized) automatic sprinkler line drops, following bursting of one (or more) of the automatic sprinklers sensed by the relay valve .
When both conditions occur, water is drained the pre-action valve’s control chamber through the 2/2-way N.C. solenoid. The valve opens instantly allowing water to flow the pipeline, through any open sprinklers and over the protected area. Pressure switches on the 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 the 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