The principle and function of FESTO solenoid valve, solenoid valve manual

The casing of FESTO solenoid valve can withstand flammable inclusions that penetrate through any joint or structural gap in the casing and remain inside without damage. And it will not cause ignition of the sexual environment formed by one or more gases or vapors. Components that can generate sparks, arcs, and hazardous temperatures are placed in fire-resistant enclosures. The explosion-proof shell isolates the interior of the equipment from the surrounding environment.

The explosion-proof casing of FESTO solenoid valve has gaps. Due to the respiration and gas permeation of electrical equipment, there may be combustible gas impurities inside. This series of solenoid valves can be widely used in scientific research departments such as textiles, printing, chemicals, plastics, rubber, pharmaceuticals, food, building materials, machinery, electrical appliances, surface treatment, as well as in daily living facilities such as bathrooms, canteens, air conditioners, and others.

FESTO solenoid valve operating frequency: When a high operating frequency is required, the structure is a pilot solenoid valve with a DC power supply.

FESTO solenoid valve working system: divided into long-term working system, repetitive short-term working system, and short-term working system; Long term working system can also be configured, which allows the coil to work with electricity for a long time; For long-term opening and short-term closing of valves, normally open solenoid valves should be selected. In the case of short-term work systems and large-scale use, special orders can be placed to reduce power consumption.

Explosion proof solenoid valves have a long working life.

All stainless steel explosion-proof solenoid valve FESTO solenoid valve normally closed: When the coil is energized, the pilot valve core is sucked in, the pilot hole opens, the pressure in the upper chamber of the valve is released, the piston is pushed by the pressure of the lower chamber medium, and the solenoid valve opens. When the coil is powered off, the pilot valve core resets under the action of the spring, the pilot hole closes, and the upper chamber of the valve is pushed by the piston hole and the reset spring, causing the solenoid valve to close.

Normally open: When the coil is energized, the pilot valve core is reset by the spring, the pilot hole is closed, the upper valve chamber is pressurized by the piston hole and the reset spring thrust, and the solenoid valve is closed. When the coil is powered off, the pilot valve core is reset by the spring, the pilot hole opens, the pressure in the upper chamber of the valve is released, the piston is pushed by the pressure of the lower chamber medium, and the solenoid valve opens.

Attention: If the outlet pressure is greater than the inlet pressure, the medium will conduct in the opposite direction. Check valves can be installed.

The function of explosion-proof solenoid valve

The electromagnetic coil housing of the explosion-proof solenoid valve not only has the explosion-proof function of withstanding gas pressure, but also has the isolation function for gas energy transmission, with high safety performance. It is a series of special solenoid valves designed specifically for transporting flammable and explosive media or for use in explosive hazardous environments. Different explosion-proof levels of solenoid valves should be selected for different environments and fluids.

Principles and characteristics of different types of explosion-proof solenoid valves for FESTO solenoid valves

1. When the FESTO solenoid valve is powered on, the electromagnetic coil generates electromagnetic force to lift the closing member from the valve seat, and the valve opens; When the power is cut off, the electromagnetic force disappears, and the spring presses the closing member against the valve seat, causing the valve to close.

Features: It can work normally under vacuum, negative pressure, and zero pressure, but the diameter is generally less than 25mm.

2. Distributed direct acting explosion-proof solenoid valve

Principle: It is a principle that combines direct action with pilot action. When there is no pressure difference between the import and export, after connecting the power supply, the electromagnetic force directly lifts the closed parts of the pilot valve and the main valve upwards in sequence, and the valve opens. When the inlet and outlet reach the starting pressure difference, after connecting the power supply, the electromagnetic force will guide the small valve, causing the lower chamber pressure of the main valve to increase and the upper chamber pressure to decrease, pushing the main valve higher by the pressure difference; The pilot valve uses spring force or medium pressure to push the closing component and move downwards to close the valve.

Features: It can also operate under zero pressure difference or vacuum high pressure, but with high power and requires horizontal installation.

3. When the FESTO solenoid valve is powered on, the electromagnetic force opens the pilot hole, and the pressure in the upper chamber rapidly decreases, forming an up and down pressure difference around the closed part. The fluid pressure pushes the closure upwards, causing the valve to open. When the power is cut off, the spring force closes the pilot hole, and the inlet pressure passes through the bypass hole. The chamber quickly generates a decreasing pressure difference around the valve closure, and the fluid pressure pushes the valve closure downwards to close the valve.

Features: High upper limit of fluid pressure range, can be installed (customized) freely, but must meet the fluid pressure difference conditions.

Direct acting zero pressure starting solenoid valve

The potential of stainless steel explosion-proof solenoid valve products:

1. The solenoid valve core is made of stainless steel, with a piston type structure and strong resistance to action fatigue.

2. The design principle of piston rings is more scientific. Usually made of special materials that are not trapped by impurities in the medium. The action sealing function is high and durable.

3. The metal piston has no direct friction with the metal valve chamber and will not get stuck. The installation direction of the valve body is strictly controlled.

4. Special coil, the coil is not easy to burn.

5. Rubber seals and reasonable configuration enhance sealing function.

6. After a long-term shutdown of the equipment, restarting it again will result in equally sensitive actions.

7. The interface size is usually based on the country, and customers can customize special interfaces.

8. The service life of conventional products is over 1 million times.

9. A solenoid valve with a shell type sealed piston ring and a fully combined sealed piston ring.

10. Explosion proof and cost-effective, suitable for working in sexual environments.

Main features of FESTO solenoid valve

Corrosion resistance: Most components are made of stainless steel or cast stainless steel, which has good corrosion resistance.

High temperature resistance: All electromagnetic components and seals are made of special high-temperature resistant electrical materials and rubber seals, and corresponding insulation measures are taken.

Wear resistance: Reasonable material selection, clever use of fluid lubrication between valve cup and guide sleeve to reduce wear.

Stability: The explosion-proof solenoid valve has a simple and compact structure, integrating the points of direct acting and pilot operated indirect solenoid valves, and can work stably under low or zero pressure difference conditions.