2-ходовые картриджные клапаны, функции давления LCT . DB (высокое давление)

Description High-pressure series Size 25 … 50 Component series 3X Maximum operating pressure 700 bar Maximum flow 3500 l/min Features Shaft sealing by default Special control spools for check valve circuit Product description 2-way cartridge valves are elements that have been designed for a compact block design. The cartridge valve type LCT is inserted into a special receiving hole in the control block and closed by a control cover type LFT. The control cover establishes the connection between the spring chamber of the cartridge valve and the pilot control valves. This enables implementation of pressure, directional and throttle functions – also in combination. The main components of 2-way cartridge valves are the cartridge valve (8) and the control cover (2) with different functionality. The cartridge valve (8) consists of a socket (3) with sealing package (4), control spool (5) and closing spring (6). The control cover (2) seals the cartridge valve to the outside. Besides simple control cover functions with external pilot oil supply, version "LFT . DBW2" is also suitable for complex switching functions thanks to its default directional valve connection surface. The connection surface is always closed pressure-tight (1). Suitable switching and proportional servo valves can be connected. The relief pressure is set at the cartridge (7). Due to structural-inherent requirements, some control cover versions feature high-pressure fittings leading to the outside. These are assigned a leakage bore L for indication of leakage at the HP fitting. These ports are not suitable for external pilot oil supply. Function Passively controlled 2-way cartridge valves operate depending on the pressure ratio at working ports A and B. This results in three important pressurized surfaces for the function A 1, A 2, A 3. The area at the valve seat A 1 is defined as 100%. Depending on the version, the annulus area A 2 realized by grading is 0%, 7% or 50% of area A 1. The area A 3 is identical to the sum of areas A 1 + A 2. At pressure function, the area is A 2 = 0. Respectively, the area is A 3 = A 1. For check valve circuits, a 7% control spool with internal pressure feedback is available This way, the set-up of the block becomes less complex as external pressure feedback into the spring chamber via the pilot oil port X is not required (see "Circuit examples") In general, the following applies: The areas A 1 and A 2 are effective in opening direction. The area A 3 and the spring are effective in closing direction. The direction of action of the resulting force from the opening and closing forces determines the working position of the 2-way cartridge valve. Example: Control cover: Type LFT 25 DBW2-3X/1000J3F Cartridge valve: Type LCT 25 DB40D-3X/700F Type code 01 02 03 04 05 06 07 08 LCT DB 40 D 3X / 700 F 01 Cartridge valve LCT 02 Size 25 25 Size 32 32 Size 40 40 Size 50 50 Control spool design (area ratio see "product description") 03 A 1 = 100 %; A 2 = 0 % DB Cracking p