We are engaged in supplying of Varese Proportional Valves & In Cartridge Valves that is of supreme quality where compact hydraulic system & logic control required in high temperature environment and for have duty hydraulic equipment.
Proportional Directional Control Valve
The valve possesses an integrated position control. With the spool position sensor (LVDT), the actual position of the valve spool is continuously recorded and brought into line with the set-point value transmitted in an analogue manner. With this, the hysteresis can be minimized and the dynamic characteristics massively improved in comparison with conventional proportional directional valves.
Thanks to the integrated amplifier electronics, the compact construction and the good protection against environmental influences, the valve is highly suitable both for applications in industry as well as in mobile hydraulics.
The parametrization takes place through a RS 232-interface by means of a menu-controlled parametrization-and diagnostics software.
The exchangeable coil significantly simplifies the logistics, because the solenoid coil can also be retrofitted. The various alternatives make the proportional screw-in cartridge a very flexible system. Different plug-voltage alternatives are available ex stock and are complemented with respect to individual adaptations-with the customary Wandfluh flexibility.
In addition, the performance of the valves has been increased by the improved solenoid coil. Therefore also ambient temperatures of up to 70°C can be accepted without any performance loss. With the improvement of the corrosion protection of the solenoid coil, depending on the version, the valves achieve a salt-spray resistance of over 500h.
Available are valves with the standard cavities M22 and M33 in accordance with ISO 7789. Pressure relief valves are available as direct operated and pilot-operated versions up to volume flows of over 230 l/min and pressures of up to 350 bar. Apart from the optimised proportional throttle for volume flows of up to 63 l/min, the All-In-One valve QSPPM33 (tight seating volume flow controller) with mechanically preset c is in the Wandfluh product range. By the preset Imin the series spread of the valves is reduced to a minimum, in order to guarantee a simplification of the valve commissioning. Typical applications for the qualitatively high-grade proportional screw-in cartridge valves are: - Sensitive adjustment of pressure, resp., volume flow-Speed control of hydro-motors-Cylinder control-and positioning-Individual adjustment of clamping-and tensioning force.
For explosion-hazard zonesatex, iecex and gost ex certified direct operated proportional pressure relief valve as a screw-in cartridge with a thread m22x1,5 for cavity according to iso 7789. Activated with wandfluh-explosion-proof-solenoid. The cartridge body made of steel is zinc coated for corrosion protection.
solenoid coil in acc. With directive 94/9/ec (atex) for explosion-hazard zones. The flameproof enclosures (acc. To en/iec 60079-1/31 and en/iec 61241-1) prevents an explosion in the interior from getting outside. The design prevents a surface temperature capable of igniting.
Type Test Certifications:
ptb 07 atex 1023iecex 010. 0020pocc ch. Ho06. B00365iecex bvs 11. 0018bvs 11 atex e 037 the steel housing is zinc-/nickel-coated. The zinc-/nickel coating serves as an excellent corrosion protection.
The valve limits the pressure in port p (1) and reliefs the volume flow to tank port t (2). The back pressure in t (2) inuences the pressure in p (1). When the operating pressure set by the proportional solenoid is reached, the poppet spool opens and connects the protected line to the tank t (2). These pressure relief valves are built according to the differential spool principle and are therefore very sensitive adjustable over the whole pressure range and also suitable for systems with extremely low minimum pressures.
These valves are suitable for applications in explosion-hazard zones, open cast and also in mines. The valve has its application in hydraulic systems, in which the pressure frequently has to be changed. The facility for remote control and signal processing from process control systems enable elegant, comfortable solutions to problems. Installation of the screw-in cartridge in control blocks as well as in the wanfluh sandwich plates (vertical stacked systems) and arrange valves of the ng4-mini and ng6 types.
Direct operated pressure relief valve as screw-in cartridge with a thread m22x1,5 and cavity according to ISO draft 7789. The valve is available in two different setting versions: key setting "s" and turning knob setting "d". Key adjustment "s" is also available with cover, see data sheet 2. 0-50.
63, 210 and 315 bar. The cartridge body made of steel is galvanized and therefore rust-protected.
When the set operating pressure is reached, the poppet spool opens and connects the protected line with the return line to the tank. By means of the adjusting mechanism, the poppet spool is pressed onto a seat which is screwed into the lower cartridge opening by a helical spring. The poppet spool is opened and closed hydraulically dampened. This makes the operation of this cartridge very stable. Thanks to the poppet/spool principle and the direct operation, these pressure relief valves are rapid acting and free of leakage oil. The reduced diameter of the seat produces a higher pressure drop and a lower flow throughput performance than pilot operated valves of the same size.
3 Way Flow Control Valve with Fixed Pressure Compensator
3-Way flow control valve as screw-in cartridge with thread M22x1.5 for cavity in accordance with ISO 7789. The valve can be supplied in 2 different setting versions: Spanner setting (S) and rotary knob setting (D). Available as standard are 3 nominal flow steps.The two-part cartridge body is made of steel. External parts are zinc coated and as a result rust protected.
The 3-way flow control valve is designed to keep the oil flow to any actuator constant irrespective of the load. Surplus volume flow will be diverted to the tank line thus saving energy and preventing an overheating of the hydraulic system. By turning the knob of the variable restrictor, the volume flow can be adjusted. In case of pressure fluctuations, the through flow cross-section in the pressure balance spool changes in such a manner, that the pressure difference in the measuring orifice is kept constant.
For use in all hydraulic systems where the supply volume flow needs to be kept constant even when the load fluctuates. Installation of the screw-in cartridge in control blocks as well as in the Wandfluh sandwich plates (vertical stacked systems) and flange valves.
Pilot operated 3-way pressure reducing valve of the screw-in cartridge type with thread M22x1,5 for cavity in according to ISO 7789. This valve reduces the inlet pressure to a adjustable outlet pressure. The integrated pressure relief function prevents the reduced pressure from being exceeded as a result of external forces. The valve is available with 2 types adjustments. A cover is also available for key adjustment. There are 3 pressure stages to choose from. The steel cartridge body and adjustment spindle are galvanised. The quality of this product is redirected in the good performance data and design.
The spool, located in the pilot operated main section of the valve, is held in the reset position by a spring. The connection to the consumer is fully open. With the pilot stage which is designed as relief valve, reduced pressure is adjustable. It opens when the set value is reached. As a result, a pilot volume flows through the nozzle in the spool. The resultant pressure difference displaces the spool towards the spring. The volume flow is throttled in the valve inlet and the reduced pressure is controlled. If forces acting on the actuator allow the reduced pressure to exceed the set value, the spool is displaced until the valve inlet closes and the reduced pressure port is being connected to tank. The pressure increase is then limited. Application:
Pressure reducing valves are used to keep the pressure constant in the consumer, irrespective of pressure fluctuations on the supply side. If there are several consumers, the pressure of the individual consumers can be set individually using the pressure reducing valve. The integrated pressure relief facility means that no additional pressure relief valve is needed in the actuator line. Installation of the screw-in cartridge in control blocks as well as in the Wandfluh sandwich plates (vertical stacked systems) and flange valves of the NG4-Mini, NG6 and NG10 types.