Coil Options

Coil Options

For All Environments

Coil voltage ratings from 1.5–1150 volts AC and DC, and a variety of construction varieties including molded, high-temperature, potted coil and housing, diode-rectified coil, third-wire ground, and spade-terminal coil.

Diode-Rectified Solenoid Valve Coils for Quiet Operation

Most solenoid valves are powered by AC current, primarily because AC voltages are readily available. An AC solenoid has a faster pull-in time, at a ratio as high as 3:1 compared to DC power. AC- or DC-powered valves have a natural audible “click” at the beginning of each cycle and can sometimes emit a low but audible hum in operation.

Valves destined for quiet environments cannot accept the possibility of a hum or buzz. In an AC valve, anything that prevents proper mating of the plunger pole faces — including dust and dirt — causes noisy operation and, because of the in-rush current and fast cycling, can cause a higher heat rise than would otherwise be experienced.

All of these AC valve conditions have led us to provide many AC valves with diode-rectified coils, allowing the valves to run on DC power for cooler and quieter operation in applications where this is required.

We offer the most basic solenoid valve with a diode-rectified coil to meet specified user criteria, and their use has not caused a significant cost increase where DC operation is necessary. For applications that require it, a 4-diode full-wave bridge is available.

Encapsulated Diode Spade Coil for Series 15 Solenoid Valves

A full-wave bridge is encapsulated into the coil assembly of Series 15 solenoid valves. Each encapsulated coil contains a diode circuit that converts common 50/60 Hz voltage to DC. Running the coil on DC eliminates the in-rush current, thus limiting the excessive heat build-up encountered with frequently cycled valves. The DC coil voltage also allows the use of an elastomeric damper within the valve itself. This damper reduces the audible click that occurs on actuation and increases the life of the valve.

Electrical Connectors

Solenoid valves can be configured with numerous coil options, voltages, orifice sizes, pressure ratings, elastomers, footprints, and more. There are a wide range of attachments and add-ons — such as splice boxes, mounting brackets, and manifolds — to enhance the utility of the solenoid valve.

Solenoid valves are factory-equipped with the required pin connectors and specified leads and lead lengths to allow installation by maintenance personnel without the need for an electrical engineer. Electrical connectors include male or female pins and connectors, custom lead lengths, junction box connectors, and other simple fasteners that can be handled on the floor or in the field. Typical electrical connectors include pin styles, receptacles, housing flag connectors, and two- or three-pin flange connectors.

Time Delay Coils

Check Process Before Media Flow

The Series 30 solenoid valves are available with time-delay coils with a built-in thermistor, employed on many oil burners. The thermistor circuit in the solenoid valve coil delays the pickup of the valve plunger from 2 to 6 seconds. This allows the solenoid to be certain of the process parameters before media flow commences.

An example is the start-up sequence for an oil burner. If there is no flame, oil flow may flood the burner, often requiring an extended period of maintenance before a re-start can be initiated. When the call activates the burner, the solenoid valve's time-delay function allows the pump and fan/motor to reach operating speed before starting fuel flow.

Series 58 Super Sub-Miniature Coils

These coils were specifically designed for small spaces. The sub-miniature coil mounts on our existing Series 58 bodies — i.e., stainless steel screw-in or 10-32 ports — and our standard plastic bodies, manifold mount or 10-32 ports. These valves are ideal for microelectronic production equipment and medical or chemical analytical applications where space is limited. Consult factory for size, pressure ratings, orifice sizes, and power requirements.