Danfoss Solenoid Valves
Danfoss solenoid valve types:
For the sake of clarity we have divided the valves into three main groups. These represent the design and functional characteristics common to most Danfoss solenoid valves:
Main groups:
• Danfoss Direct-operated valves
• Danfoss Servo-operated valves
• Danfoss Assisted lift servo-operated valves
Direct-operated valves ( EV210B and EV310B ) can be opened and closed independently of the differential pressure (within the permissible differential pressure range).
A servo-operated valve (EV220B, EV222B AND EV225B ) uses the differential pressure to create the force necessary to open the valve and keep it open. It can therefore only be opened when a certain differential pressure exists. The speed at which the valve closes is dependent on the differential pressure.
Assisted lift servo-operated valves ( EV250B ) are designed for heating systems and other closed-circuits with low, undefined pressures. These valves are able to operate without differential pressure.
Danfoss solenoid valves are available as separate coils and valves which can be combined freely within the individual product families. This provides greater flexibility and a reduced storage requirement at the same time. No tools are required to assemble coils and valves, and a coil can be replaced without stopping or emptying the system. Solenoid valves are available as assembled units if required.
Danfoss 2-Way Solenoid Valves
Danfoss 2-Way solenoid valves have one inlet and one outlet, and are used to permit and shut off fluid flow. The two types of operations are Normally Closed (NC) and Normally Open (NO). Two types of constructions apply to 2-way solenoid valves, which are direct acting and pilot operated.
With Direct acting constructions, the solenoid is energised, the core directly opens the orifice of a Normally Closed valve or closes the orifice in a Normally Open Valve. The valve will operate at pressures from 0 psi to its rated maximum.
Pilot Operated constructions use line pressure to assist operation. When the coil is de-energised (on a Normally Closed Valve), the pilot orifice is closed and line pressure is applied to the top of the piston or diaphragm through the bleed orifice, closing the valve.
Danfoss' line of 2-way solenoid valves include General Service, Hot Water/ Steam, Potable Water and Food Service, Vacuum, Cryogenic and Liquid C02, Air Operated, Proportional, Intrinsically Safe, Low Power, Isolation / Shielded Core, Long Life / Quiet, Ammonia, Dry Air, Magnetic Latching and Medical / Analytical.
Danfoss 3-Way Solenoid Valves
Danfoss 3/2 solenoid valves or 3 way solenoid valves have three port’s and two orifices, when one orifice is open the other orifice is closed. Three way solenoid valves can be Normally Open (NO), which means when the valve is in its “rest state” i.e. when no power is applied, the valve position is open, and Normally Closed (NC) which means in the “rest state” the valve position is closed. 3/2 way solenoid valves are available in a Universal (U) function, which means depending on the application the solenoid valves can be fitted into a pipeline in either the NO position or the NC position.
3/2 solenoid valves are used to exhaust or divert process media, with the most common use being to exhaust or divert Air. A 3/2 way solenoid valve can be connected to select one or two ports, or to divert flow from one port to another. Danfoss' 3 way solenoid valves utilise a Direct Operated construction.
Danfoss' range of 3/2 solenoid valves are available in either Brass, Stainless steel. Danfoss solenoid valves are available in a wide range of sizes and pressures and voltages, with special materials and voltages available on request.
Danfoss Steam Solenoid Valves
Danfoss steam solenoid valves with teflon diaphragm (EV225B) or brass piston with PTFE disc (EV245B), servo-operated 2/2-way steam valve. The valve body in dezincification resistant brass and EV225B valve seats made in stainless steel ensures a long life even in connection with aggressive steam media.
Applications include:-
• Heating up of water for Laundry Washers and dishwashers
• Steam injection on industrial Flat Ironers
• Steam injection on Dryers
• Injection of steam into Autoclaves and Sterilizers
• Steam handling and distribution in boiler room installations
• High reliable function even in connection with contaminated steam
