A recovery mechanism such as springs should be present at the small valve core a to enable the small valve a to recover from the electromagnetic valve core c to its initial state after its loss。
Action description; when the electromagnetic valve is non-electrified, the core e does not move because the small core a is blocked by pipe b. When the electromagnetic valve is electrocuted, the piping b is opened because the small valve a is attracted by the electromagnetic valve iron core c, which moves the compressed air drive valve e。
Depending on the temperature of the flow medium, pressure, etc., such as pressure on the pipe and no pressure on the flow. Emps work differently. I'll introduce you one by one
I: direct electromagnetic valves
There are two types of permanent closed and open. The constant power outages are closed, generating electromagnetic force when the wire is running, allowing the kinetic core to open the valves directly over the spring and the static core, and the medium to open the path; when the wire is out, the electromagnetic power disappears, the kinetic core is repositioned under the spring, the valves are shut down directly and the medium is not functional. The structure is simple, reliable and works in a zero-pressure and micro vacuum. It's the opposite. If an electromagnetic valve is less than the zero six flow diameter。
Rationale:
When the constant closed direct electromagnetic valves are active, the electromagnetic insorption in the electromagnetic wire generates the core of the valves, which opens the sealing of the shut-off pieces away from the open valve; when the power is cut, the electromagnetic power disappears, and by springing the shut-off elements are shut down on the valves. (as opposed to the frequent opening)
Characteristics: normal working at vacuum, negative pressure, zero pressure, but generally not exceeding 25 mm. Up to dn50 may be installed at random, but the electromagnetic head is larger. If our company introduces direct electromagnetic valves produced by herion technology, they can be used in a 1. 33 x 10-4 mpa vacuum。
Ii. Step straight electromagnetic valves
The valve is integrated with a single and secondary valve, and the main valves and the conductor valves are phased so that the main valve is opened directly by electromagnetic force and pressure differentials. When the wire is wired, the electromagnetic force is created to inhale the kinetic core and the static core, the conductor valve is opened and the conductor valve is located on the main valve and the kinetic core is attached to the main valve core, at which point the pressure of the upper cavity of the main valve is discharged through the conductor valve, moving the main valve core upwards and opening the flow of the main valve medium, with the combined effect of the pressure difference and electromagnetic force. When the electromagnetic power disappears when the kinetic core closes the conductor valve with self-heaviness and spring force, when the medium enters the upper cavity of the main valve in the balance hole, raising the upper cavity pressure, and when the main valve is shut down with the effect of spring re-entry and pressure. It is well structured, reliable and reliable at zero pressure. For example: zqdf, zs, 2w, etc。
Principle: it is a combination of direct and lead, and when the entry and export pressure are equal to 0. 05 mpa, the electromagnetic force lifts the lead small valve and the main valve up in turn and opens the valve. When the entrance and export pressure differ by 0. 05 mpa, the electromagnetic force opens the lead small valve, increases the lower cavity pressure of the main valve and decreases the upper cavity pressure, thus pushing the main valve upwards using the pressure differential; when power is cut, the lead valves and the main valves use spring power or medium pressure to drive the closure, move downward and close the valve。
Characteristics: works can also be reliable at zero pressure differentials or vacuums, but with greater power, which requires vertical installation。
Iii. Indirect lead electromagnetic valves
This series of electromagnetic valves is formed by a combination of the lead valve and the main valve core in connection with the channel; the constant closed type is closed when electricity is not available. When the coil is powered, the magnetic forces that are generated combine the kinetic and static cores, open the portal, and flow the medium to the export, when the upper cavity pressure of the main valve core is reduced below the pressure on the side of the import, and the resulting tension overcomes the resistance of the spring and then moves upward to the point of opening the main valve, and the medium flows. When the wire is out of power, the magnetic force disappears and the kinetic core closes the lead entrance by repositioning it under the spring, when the medium flows from the balance hole, increases the upper cavity pressure on the main valve core and moves downwards under the spring force and closes the main valve. The principle of frequentity is the opposite. E. G. Sla, df (over 15 calibre), zcz, etc。
Principle: when electricity is powered, the electromagnetic drive lead valve opens the lead valve, the main valve has a rapid decrease in upper and lower cavity pressure, creates a pressure variance in the upper and lower cavity of the main valve, relies on medium pressure to drive the main valve to move up and the valve to open; when power is cut, the spring power closes the lead valve, and the entry medium pressure creates a pressure difference in the upper cavity of the main valve through the lead hole。
Characteristics: small size, low power but limited range of medium pressure differentials, which must be met。
