German Roetelmann valves Roetelmann models Roetelmann prices

Roetelmann valves are electromagnetically controlled industrial devices. They are basic automation components for fluid control, classified as 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 precision and flexibility. There are many types of solenoid valves, each serving different functions at various positions in the control system; the most common types include check valves, safety valves, directional control valves, and speed control valves.

Roetelmann valve operating principle

The solenoid valve contains a sealed chamber with ports opened at different positions, each connected to different oil lines. A piston is located in the center of the chamber, with two electromagnets on either side. When the coil 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 lines. The oil pressure then pushes the piston in the hydraulic cylinder, which drives the piston rod, and the piston rod actuates the mechanical device. Thus, mechanical motion is controlled by switching the current to the electromagnets on and off.

Roetelmann 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) Inspect the valve sealing surface for wear and repair or replace it as necessary. 5) Check the wear condition of the trapezoidal threads on the valve stem and stem nut, and whether the packing is outdated or failed, and perform necessary replacements. 6) Test the sealing performance of the valve to ensure its integrity. 7) Valves in operation should be in good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 lost, it should be replaced promptly; do not use an adjustable wrench as a substitute. 9) The packing gland must not be skewed or lack pre-tightening clearance. 10) If the valve operates in a harsh environment prone to contamination by rain, snow, dust, or sand, 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 lead seal and cap. 12) The insulation jacket should have no dents or cracks. 13) Avoid striking valves in operation or supporting heavy weights on them.

Roetelmann 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 electromagnetic force that lifts the closing member off the valve seat, opening the valve. When de-energized, the electromagnetic force disappears, and the spring presses the closing member against the valve seat, closing the valve. Features: 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 activates the pilot small valve, causing the pressure in the lower chamber of the main valve to rise and the pressure in the upper chamber to drop, thereby 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. Features: It can operate reliably under zero pressure difference, vacuum, or high pressure conditions, 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 upper chamber through the bypass hole, creating a pressure difference (lower below, higher above) around the closing member, and the fluid pressure pushes the closing member downward, closing the valve. Features: It has a higher upper limit for fluid pressure range and can be installed in any orientation (customization required), but the fluid pressure difference conditions must be met.

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