Keystone Electronics Model 791 overview
Avid Model 791 Series 3-Way and 4-Way Solenoid Valves.The Model 791 Solenoid valve, four-way version, is a four-way, two-position solenoid operated, spring retu...
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Manufactured byKeystone Electronics
Product groupModules
DescriptionAvid Model 791 Series 3-Way and 4-Way Solenoid Valves.The Model 791 Solenoid valve, four-way version, is a four-way, two-position solenoid operated, spring return valve. Its flexible lip seal design allows for positive shifting of air flow and constant cleaning of the spool with each shift, enabling the valve to stroke millions of trouble-free cycles.Directional ControlWhen the solenoid operator is energized, the solenoid coil creates a magnetic field surrounding the plunger assembly and plunger. The plunger is lifted off its seat by this magnetic force and supply air provides an internal pilopressure that is directed to the pilot piston that shifts the spool and compresses the main spring. This shifting of the spool directs the flow of supply air from inlet port 1 to cylinder port 4 while cylinder port 2 is connected to exhaust port 3.When the solenoid coil is de-energized, a spring on the plunger will return the plunger to its seat, blocking internal pilot air, and open a vent port. This vent port will allow the air on the spool’s pilot piston to excape, and the main spring will return the spool to its normal position. In this position, the spool directs flow of supply air from inlet port 1 to cynlinder port 2 while cylinder port 4 is connected to exhaust port 5.
SpecificationsBody - Aluminum Coil Housing - NEMA 4-Steel or Epoxy Molded (DIN) enclosure; NEMA 4, 7, and 9, IP65/CSA UL listed explosion proof CRS construction Electrical Connection - 1/2” NPT conduit entry standard, DIN connection available Air Connections - Supply: 1/4” NPT (Port 1) Exhaust: 1/8” NPT (Ports 3 and 5) Keystone mounting 1/4” NPT (NAMUR and inline) Flow: Three Way - 0.055 Cv Four Way Keystone Mounting - 0.7 Cv Four Way Inline - NAMUR 1.8Cv NBR Seals
Key FeaturesNEMA 4 or NEMA 4, 7, and 9 Explosion Proof ratings available. 5/2, 5/3 or 3/2 functions available. Flexible Lip seal ensures reliability and long service life. Class F coil is standard for NEMA 4 units. Class H coil is standard for NEMA 7 units. Manual override capability simulates solenoid coil operation. Continuous duty. Air supply filtered, lubricated or non-lubricated. High flow rates. Direct mounting to all Tyco Rack and Pinion actuators with stainless steel fasteners. Remote mounting via sub-base.
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