Applications which require different power levels than those available for standard, intermittent or pulse duty cycles. This covers applications at ambient temperature significantly above or below 76°F (25°C), or a desired current drain, below standard value, or a special duty cycle, or other design requirement affecting power.
A device comprised of a coil of wire, a housing and a moveable plunger (armature). When an electrical current is introduced, a magnetic field forms around the coil which draws the plunger in. A Solenoid essentially converts electrical energy into mechanical force.
Sleeving used on standard Solenoids to insulate the lead wires where they exit the Solenoid case is black Vinylite per Mil-I-631B, Type F, subform Ua, Grade C, Class 1, Category 1, and meets UL files E13565 and E-18459. Sleeving on high-temperature coils is Teflon for temperatures up to 200°C continuous, and will meet the requirements
The cylindrical bearing in the base of the solenoid which provides a guide for the shaft. Usually made from phosphor bronze, it can be made of other materials for different applications requiring longer life.
The small diameter portion of the plunger assembly of a push-type Tubular solenoid which protrudes through the base or stationary pole face and provides push capability; usually made from #303 stainless steel.
Standard construction is nominally rated for 1,000,000 cycles. In actual service, cycle life exceeding this figure is constantly being experienced. Periodic cleaning and lubrication will help in extending life. Severe operating conditions—a heavy side load on the plunger, for example, may shorten cycle life. Since many factors other than the solenoid construction itself have this
Under normal in-plant ambient conditions, standard designs should perform satisfactorily over expected life. Unusual conditions of airborne contamination may require protective boots to seal off the plunger cavity. Additional protection of exposed surfaces may be required.
The ambient temperature range, voltage fluctuation, return springs and temperature rise all affect the net available output torque or force of a solenoid. A 1.5 safety factor should be applied to preliminary calculations of torque or force.
Return springs are often used to return the plunger and/or push rod back to its original position. Return springs can be internal or external to the solenoid and custom fit for a customer's unique needs.
Coil resistance tolerances are generally ±5% for heavier gage wires where precision coil windings are used and ±10% for finer gage wire where random winding processes are used. Tolerances are shown for each solenoid in the individual specification charts.
