Direct acting solenoid valve
Principle: power, the Electromagnetic Coil generates an electromagnetic force to the closure member is lifted from the valve seat, the valve opens; when power is off, the electromagnetic force disappears, the spring pressure in the valve closure member, the valve closes.
Features: can work in the vacuum, negative pressure, zero pressure, but the path is generally not more than 25mm.
Step direct acting solenoid valve
Principle: It is the principle of a direct-acting and pilot-operated combination, when there is no pressure inlet and outlet, the power, the electromagnetic force directly to the pilot valve and the main valve closure member followed up, and the valve opens. When the inlet and outlet reaches the starting pressure, the power, the electromagnetic force pilot valve, the main valve chamber under increased pressure, the chamber pressure drops, which use pressure to push up the main valve; power, the pilot valve with a spring force or medium pressure to promote off pieces, moving down, the valve closes.
Features: zero pressure or vacuum, high pressure can also be * action, but power is larger, the requirements must be mounted horizontally.
Pilot solenoid valve
Principle: power, the electromagnetic force open the pilot hole, the upper chamber pressure drops rapidly, around the closure member is formed on the lower high pressure, fluid pressure to promote the closure member is moved upward, the valve opens; when energized, the spring force of the pilot hole is closed, the inlet pressure through the bypass hole quickly shut the valve chamber is formed around the low pressure on the high fluid pressure to promote the closure member is moved downward to close the valve.
Features: high fluid pressure upper limit can be any installation (to be customized) but fluid pressure conditions must be met.
2, solenoid valves from distinguish between different valve structure and materials with the principles on the on the branch is divided into six categories: direct-acting diaphragm structure, step by step direct-acting diaphragm structure, the pilot diaphragm structure, direct-acting piston structure, stepwise linear movement structure, the pilot piston piston arrangement.
3, the solenoid valve according to functional classification: water Electromagnetic Valve, steam solenoid valves, refrigerant solenoid valve, cryogenic solenoid valve, gas valve, fire solenoid valve, solenoid valve ammonia, a gas solenoid valve, liquid solenoid valve, miniature solenoid valves, pulsed electromagnetic valves, hydraulic solenoid valve normally open solenoid valve, oil solenoid valve, DC solenoid valves, high pressure solenoid valve, explosion-proof solenoid valve.
A solenoid valve is an electromechanically operated valve. The valve is controlled by an electric current through a solenoid: in the case of a two-port valve the flow is switched on or off; in the case of a three-port valve, the outflow is switched between the two outlet ports. Multiple solenoid valves can be placed together on a manifold.
Solenoid valves are the most frequently used control elements in fluidics. Their tasks are to shut off, release, dose, distribute or mix fluids. They are found in many application areas. Solenoids offer fast and safe switching, high reliability, long service life, good medium compatibility of the materials used, low control power and compact design.
Besides the plunger-type actuator which is used most frequently, pivoted-armature actuators and rocker actuators are also used.
Solenoid valve designs have many variations and challenges.
Common components of a solenoid valve:
- Solenoid subassembly
- Retaining clip (a.k.a. coil clip)
- Solenoid Valve Timer
- Solenoid Coil (with magnetic return path)
- Core tube (a.k.a. armature tube, plunger tube, solenoid valve tube, sleeve, guide assembly)
- Plugnut (a.k.a. fixed core)
- Shading coil (a.k.a. shading ring)
- Core spring (a.k.a. counter spring)
- Core (a.k.a. plunger, armature)
- Core tube–bonnet seal
- Bonnet (a.k.a. cover)
- Bonnet–diaphram–body seal
- Hanger spring
- Backup washer
- Diaphram
- Bleed hole
- Disk
- Valve body
- Seat
- air valve
- water inlet valve
- control valve
The core or plunger is the magnetic component that moves when the solenoid is energized. The core is coaxial with the solenoid. The core's movement will make or break the seals that control the movement of the fluid. When the coil is not energized, springs will hold the core in its normal position.
The plugnut is also coaxial.
The core tube contains and guides the core. It also retains the plugnut and may seal the fluid. To optimize the movement of the core, the core tube needs to be nonmagnetic. If the core tube were magnetic, then it would offer a shunt path for the field lines. In some designs, the core tube is an enclosed metal shell produced by deep drawing. Such a design simplifies the sealing problems because the fluid cannot escape from the enclosure, but the design also increases the magnetic path resistance because the magnetic path must traverse the thickness of the core tube twice: once near the plugnut and once near the core. In some other designs, the core tube is not closed but rather an open tube that slips over one end of the plugnut. To retain the plugnut, the tube might be crimped to the plugnut. An O-ring seal between the tube and the plugnut will prevent the fluid from escaping.
The solenoid coil consists of many turns of copper wire that surround the core tube and induce the movement of the core. The coil is often encapsulated in epoxy. The coil also has an iron frame that provides a low magnetic path resistance.
Solenoid Valve
Electromagnetic Valve, Pneumatic Component, Pneumatic Solenoid Valve, Air Compressor Valve,Solenoid Valve Timer
NINGBO BRANDO HARDWARE CO.,LTD , https://www.brandopneumatic.com
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