Клапан свободной циркуляции Hägglunds VFCCA 1000 Включает клапаны для сред ATEX Bosch Rexroth

Description Valid for: Hägglunds motor CA, CB, CBM Maximum flow 1000 l/min Maximum pressure 350 bar Open and closed loop hydraulic system Features load error Product description General The free-circulation valve with freewheeling function is designed for use with Hägglunds Compact motors CA, CB and CBM. The valve is normally mounted on the motor via an adapter. The valve provides a means of putting the motor safely into free circulation mode. The valve is also suitable for free-wheeling mode by disengaging the pistons and allowing the cylinder block to freely rotate on its bearings. This is achieved by pressurizing the motor case and thus pushing the piston assemblies towards the motor centre. Additional circuitry is required to achieve full free-wheeling mode. Maximum operating pressure is 350 bar and maximum flow 1000 l/min. The valve is available in two configurations: VFCCA 1000 H (Free circulation valve Hydraulic operated) VFCCA 1000 E (Free circulation valve Electric operated 24VDC) Notice! Only one valve is to be used on the Hägglunds CBM. For more than one valve, contact Bosch Rexroth DC-IA/EHD. Function Free circulation The motor is put into free circulation mode by switching the main control poppet’s (510) and (520) in the valve. When the poppet´s are in neutral position they allow flow from P to Am and C to Cm. When the poppet´s are switched, P and C are blocked and Am and Cm are connected to T. The pressure in T connection must be according to the corresponding and needed charge pressure. The charge pressure is dependent of motor speed and motor type. See table “Recommended charge pressure”, Technical data in the Data Sheet for respectively motor CA, CB and CBM. For exchange of oil in the loop the connection on the adapter FAm or FCm has to be used dependent of the direction of rotation. The poppet´s are switched by a hydraulic pilot valve which is controlled either hydraulically or electrically and the poppet´s are spring returned to their blocked position. For electric operation a solenoid operated directional valve is fitted. The pilot pressure from the directional valve is fed by a pair of check valves (540) and (560) which are connected to the C and A motor lines respectively. The directional valve is detent. That means, if one solenoid is operated the valve spool is held in that position until the opposing solenoid is operated. For hydraulic operation the valve is replaced by a block which connects XFW to the main poppets. The main poppet´s will normally be held over by their springs but pressure applied to XFW will cause the main poppets to switch. Connection T3 must be connected to drain line. Shifting is allowed up to a speed of 40 rpm. At speed above 10 rpm the charge pressure level has to be checked. Free-wheeling All compact motors can be operated in free-wheeling mode by retracting the pistons from the cam ring and allow the cylinder block to rotate freely on its bearings. The valve is operated in the same way as with fr