German DEPA valves DEPA models DEPA prices

DEPA valves are electromagnetically controlled industrial devices. They are basic automation components for fluid control, belonging to the category of actuators, and are not limited to hydraulic or pneumatic applications. They are used in industrial control systems to adjust media direction, flow rate, speed, and other parameters. Solenoid valves can be combined with different circuits to achieve desired control, ensuring both control precision and flexibility. There are many types of solenoid valves, each playing a role at different positions in the control system; the most common types include check valves, safety valves, directional control valves, and speed control valves.

DEPA valve operating principle

The solenoid valve contains a sealed chamber with through-holes at different positions. Each hole connects to different oil pipes. A piston is located in the center of the chamber, with two electromagnets on either side. When the coil of the magnet on one side is energized, the valve body is attracted to that side. By controlling the movement of the valve body, different oil discharge ports are opened or closed. The oil inlet port is normally open, allowing hydraulic oil to enter different discharge pipes. The oil pressure then pushes the piston of the hydraulic cylinder, which drives the piston rod, and the piston rod drives the mechanical device. Thus, mechanical motion is controlled by switching the current to the electromagnets on and off.

DEPA valve routine maintenance

1) Pay attention to the valve storage environment; it should be stored in a dry, ventilated indoor area, with both ends of the flow path blocked. 2) Valves should be inspected regularly, cleaned of dirt, and coated with anti-rust oil on their surfaces. 3) Valves that have been installed and put into service should undergo regular maintenance to ensure normal operation. 4) Check whether the valve sealing surface is worn, and repair or replace it as necessary. 5) Inspect the wear condition of the trapezoidal threads on the valve stem and stem nut, and check whether the packing is outdated or failed, replacing them as necessary. 6) Test the sealing performance of the valve to ensure its integrity. 7) Valves in operation should be in good condition, with all bolts on flanges and supports present, threads undamaged, and no looseness. 8) If the handwheel is missing, it should be replaced promptly; do not use an adjustable wrench as a substitute. 9) The packing gland must not be tilted or lack pre-tightening clearance. 10) If the valve operates in a harsh environment prone to contamination by rain, snow, dust, sand, etc., a protective cover should be installed on the valve stem. 11) The scale on the valve should remain complete, accurate, and clear; check the valve's lead seal and cap. 12) The insulation jacket should have no dents or cracks. 13) For valves in operation, avoid striking them or supporting heavy weights on them.

DEPA valve classification

Solenoid valves are divided into three main categories based on their operating principle: 1) Direct-acting solenoid valve. Principle: When energized, the electromagnetic coil generates an electromagnetic force that lifts the closing member off the valve seat, opening the valve. When de-energized, the electromagnetic force disappears, and a spring presses the closing member against the valve seat, closing the valve. Characteristics: It can operate normally under vacuum, negative pressure, and zero pressure conditions, but the nominal diameter generally does not exceed 25mm. 2) Step-by-step direct-acting solenoid valve. Principle: It combines direct-acting and pilot-operated principles. When there is no pressure difference between the inlet and outlet, energizing the valve causes the electromagnetic force to lift the pilot small valve and the main valve closing member sequentially, opening the valve. When the pressure difference between the inlet and outlet reaches the starting differential pressure, energizing the valve causes the electromagnetic force to act on the pilot small valve. The pressure in the lower chamber of the main valve rises, while the pressure in the upper chamber drops, using the pressure difference to push the main valve open. When de-energized, the pilot valve uses spring force or media pressure to push the closing member downward, closing the valve. Characteristics: It can operate reliably at zero pressure difference, vacuum, or high pressure, but it has higher power consumption and requires horizontal installation. 3) Pilot-operated solenoid valve. Principle: When energized, the electromagnetic force opens the pilot hole, causing the pressure in the upper chamber to drop rapidly. This creates a pressure difference (lower above, higher below) around the closing member, and the fluid pressure pushes the closing member upward, opening the valve. When de-energized, the spring force closes the pilot hole. The inlet pressure rapidly enters the chamber through the bypass hole, creating a pressure difference (higher above, lower below) around the closing member, and the fluid pressure pushes the closing member downward, closing the valve. Characteristics: The upper limit of the fluid pressure range is relatively high. It can be installed in any orientation (customization required), but the fluid pressure difference conditions must be met.

Weidou Intelligent Technology specializes in selling German DEPA valves, DEPA safety valves, DEPA globe valves, DEPA control valves, DEPA solenoid valves, DEPA ball valves, DEPA proportional valves, DEPA diaphragm valves, DEPA butterfly valves, DEPA hydraulic transmission valves, DEPA check valves, DEPA pressure reducing valves, DEPA relief valves, DEPA sequence valves, DEPA balance valves, DEPA throttle valves, and DEPA directional valves. All products are original imports from Germany. Customers are welcome to inquire and place orders.