MP Filter LMD 211 Series

Description

Highly reliable hydraulic circuits require components capable of ensuring maximum efficiency and minimizing operational interruptions. The MP Filter LMD 211 Series is a highly versatile duplex solution specifically engineered for low- and medium-pressure applications. This component is designed to operate safely with a maximum working pressure of 6 MPa (60 bar) and to handle flow rates up to 200 l/min. The filters connect in-line directly to the system through hydraulic fittings, offering female threaded or flanged connections with diameters up to 1 1/2″.

Operating Principle and Operational Advantages

The main tactical advantage provided by this series lies in the integrated changeover function. This mechanism allows the flow to be diverted and the exhausted filter element to be replaced without requiring system shutdown. To ensure safe operation, a balancing valve is integrated directly into the changeover lever, with the purpose of equalizing pressure inside the filter body before switching from one chamber to the other. The structure includes vent ports to prevent trapped air from entering the circuit and drain ports to remove excess fluid before maintenance operations. In addition, to protect the filter media from critical pressure drops, a bypass valve is included with a standard opening pressure calibrated at 0.35 MPa (3.5 bar). Internal fluid dynamics ensure that flow through the filter element proceeds from the outside to the inside (OUT to IN).

Design Features and Materials

The mechanical robustness of the filter ensures extended service life, validated by fatigue testing up to 1,000,000 cycles with pressure variations from 0 to 60 bar. The filter head is made of aluminum, while the containers (bowls) are manufactured from steel treated with cataphoretic coating. The bypass valve body is made of AISI 304 steel combined with polyamide. Hydraulic sealing is provided by standard NBR seals (series A), with the option of FPM seals (series V) for specific applications; this configuration allows the device to maintain its technical characteristics within an operating temperature range from -25°C to +110°C. The construction layout requires vertical installation.

Filter Element Specifications and Variants

The LMD 211 Series is available in three distinct dimensional sizes (Lengths 1, 2, and 3), with weights ranging from 9.5 kg to 12.8 kg and containment volumes between 4.1 dm³ and 5.3 dm³. The range of compatible filter elements (belonging to the CU 210 Series) covers every purification requirement: inorganic microfiber for absolute filtration (ratings from 3 to 25 microns), microfiber with water absorption capacity, wire mesh (from 25 to 90 microns), and resin-impregnated paper (10 and 25 microns). The differential collapse resistance for standard elements (series N) is rated at 20 bar.

Applications and Clogging Indicators

The installation of duplex filters is essential in hydraulic systems where downtime results in significant economic losses or creates serious operational safety risks. To accurately monitor the progressive clogging of the filter element and plan maintenance without unexpected interruptions, the filter body is designed to accommodate differential clogging indicators of visual, electrical, and electronic types. If periodic oil analysis is required, the system can be equipped with optional sampling ports.

Technical summary table of the main features of the MP Filter LMD 211 Series.