2-ходовые картриджные клапаны с контролем положения золотника LFA..E79 (крышка управления)

Description Size 25 Component series 6X Maximum operating pressure 420 bar Maximum flow 25000 l/min Size 25 Component series 6X Features Functional product design Modular set-up: • Cartridge valve with various options • Control cover in various variants for realization of selected functions • Hydraulic monitoring of the spool position Power and flow-optimized design: • High flows • Low pressure drops • High switching velocities • Low leakage oil flows Robust design: • High reliability • Long life cycle Other features: • Small installation size, low weight • Easy to service Product description 2-way cartridge valves are elements that have been designed for a compact block design. The power section with connections A and B is installed into the control block in a receiving hole standardized according to ISO 7368 and closed with a cover. In most cases, the cover is also the connection from the control side of the power section to the pilot control valves. By control with respective pilot control valves, the power section can be applied for pressure, directional and throttle functions or a combination of these functions. Particularly efficient solutions are realized by adjustment of the size to various flows of the individual ways of an actuator. The application of power sections of elements for multiple functions is very cost-effective. 2-way cartridge valves generally consist of control cover (1) and installation kit (2). The control cover contains the control bores and optionally a stroke limitation function, a hydraulically controlled directional seat valve or a shuttle valve according to the required overall function. Additionally, electrically operated directional spool or seat valves can be installed at a control cover. The installation kit consists of a bushing (3), ring (4) (only up to NG32), valve poppet (5), optionally with damping nose (6) or without damping nose (7) as well as closing spring (8). The function of 2-way cartridge valves is pressure-dependent. This way, three crucial pressurized areas A 1, A 2, A 3 are realized for the function. The area at valve seat A 1 is observed as 100 %. Depending on the version, the annulus area A 2 realized by grading is 7 % or 50 % of area A 1. The area ratio A 1 : A 2 is respectively either 14.3 : 1 or 2 : 1. The area A3 is identical to the sum of areas A 1 + A 2. Due to the different area ratios A 1 : A 2 and the resulting different annulus areas ( A 2), the area A 3 is one time 107 % and another time 150 % of the area A 1 at the seat, which is observed as 100 %. 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 spool position of the 2-way cartridge valve. The 2-way cartridge valves can be passed from A to B or from B to A. Pressurization of area A 3 by pilot oil discharge from channel B or exte