A solenoid valve is a combination of two basic functional units. A solenoid (electromagnet) with its plunger (core) & a valve containing an orifice, in which a disk is positioned, either to allow or to prevent the flow of the medium being controlled. In the main, solenoid valves are covered by the following types of operation. Direct Acting Solenoid Valves, Pilot Operated Solenoid Valves & External Pilot Operated Solenoid Valves. This valve is usually of diaphragm or piston operated construction, equipped with a three-way solenoid pilot valve. The pilot valve alternatively applies pressure to or exhausts pressure from the diaphragm or piston for the operation of the main valve.
The simple two-way valves briefly described above form the majority of solenoid valves used in the industry. Other more complex types in use include three-way and four-way valves, manually and electrically reset valves and a wide variety of special valves.
We recognise the importance of safety, reliability and availability in the automation of process valves and have positioned ourselves favourably to be able to offer an extensive scope of supply from stock for all of our Actuated Valves. Incorporating Safe Area IP65, Intrinsically Safe & Explosion Proof designs from the 551 series of Asco Solenoid Valves we can cover all bases of specification.
In a direct acting Asco Solenoid Valve, the solenoid plunger (core) is mechanically connected to the valve disk and directly opens or closes the orifice, depending upon whether the solenoid is energized or de-energized. Operation is independent of line pressure or rate of flow and the valve will operate from zero pressure to its maximum rated pressure.