Two Stage Closure
The EP series of valves require two solenoids (sold separately) to control the two state closure of the valve. During full flow, the S1 solenoid valve opens to permit compressed air into the high-flow chamber. During dwell flow, the S1 valve closes and the S2 valve opens. With LCR Electronic Registers, at the end of a preset delivery, S2 will close at a programmed time to dispense an exact volume. Shut off during this dwell flow also reduces the risk of hydraulic shock.
Valve Closed
When no air is supplied to the high-flow or low-flow chambers, piston a–which attaches to shaft b–presses on gasket c due to the action of spring d. When closed, the fluid pressure contributes to the sealing force of the spring.
Full Flow
When the high-flow chamber is supplied with air, shaft b lifts until making contact with head e, lifting piston a to its maximum position.
Reduced (Dwell) Flow
When air is shut off from the high-flow chamber and supplied to the low-flow chamber, piston f lifts until it contacts head g and lifts the piston a by an amount determined by the position of stop nut h. This nut can be adjusted to allow for 0-15% of full flow.
