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Two-Way Solenoid Valve

This type of two-way solenoid valve has one inlet and one outlet, and is 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 two-way solenoid valve, which is direct acting and internally piloted.

With direct acting constructions, the solenoid is energized; 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.

Internally piloted constructions use line pressure to assist operation. When the coil is de-energized, 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.

The line of two-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.

Two Types of Operations Apply:

Normally Closed (NC): Fluid is shut off when the coil is de-energized, flows through the valve when the coil is energized.

Normally Open (NO): Fluid flows through the valve when the coil is de-energized, shuts off when the coil is energized.

Two Types of Constructions Apply:

Direct Acting: When the solenoid is energized, 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. The force needed to open the valve is proportional to the orifice size and fluid pressure.

As orifice size increases, so does the required force. To open larger orifices without increasing solenoid size, internal pilots are used.

Internally Piloted: These valves use line pressure to assist operation.

When the coil is de-energized, 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. When the coil is energized, the core opens the pilot orifice, relieving pressure from the diaphragm or piston. Line pressure, alone, opens the valve by lifting the diaphragm or piston off the main orifice.

General Service – Air/Inert Gas, Water, Lt. Oil (up to 300 SSU) service at moderate temperatures.
Hot Water / Steam – High temperature fluid applications such as laundries, molding, sterilizing, autoclaves, steam atomization, etc.
Potable Water and Food Service – NSF listed valves designed for use in drinking water systems and food service equipment.
Vacuum – Designed for Low Vacuum (to 29″Hg) to High Vacuum (to 10-6 Torr) applications.
Cryogenic and Liquid CO2 – Designed to control Cryogenic fluids to –320°F(-196°C) and Liquid CO2 to –75°F(-59°C)
Air Operated – Uses auxiliary compressed air or water source to shift valve, rather than a solenoid operator.
Proportional – Uses electrical input signal to control pressure or flow output.
Intrinsically Safe – Designed solely for use in intrinsically safe areas with properly approved and sized current and voltage limiting barriers.
Low Power  – 1.4 W low wattage coil to provide PLC and DCS compatibility for BUS network and traditional wiring, reduced battery drain, reduced wiring cost, reduced temperature rise, energy savings.
Isolation / Shielded Core – Harsh and corrosive fluid control applications.
Long Life / Quiet – Designed for quiet operation and long life, up to 20 million cycles, in dry air or gas applications.
Ammonia - Designed for use with anhydrous and gaseous ammonia.
Dry Air - Designed for use in applications which require air to be free of lubricants.
Magnetic Latching - Ideal for remote applications where continuously powered devices can’t be used, such as irrigation systems.
Medical/Analytical - ASCO Miniature general service, isolation, pinch, and proportional valves are utilized for the precise and reliable control of liquids and gases in medical equipment and analytical instrumentation.

(Edited by Eloise Tsai)

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