Group: Bucher
Catalog excerpts
Proportional 3/2 Throttle Cartridge, Size 5 Qmax = 30 l/min, pmax = 250 bar Sliding-spool design, direct acting Series MDR32GN…-5… S De-energised closed 1 " 2 S Compact construction for cavity type AM – 3/4-16 UNF S Very good reproducibility S Reliable operation over the whole pressure and flow range (even with high pressure differentials) S With optional manual flow setting S All exposed parts with zinc-nickel plating S High pressure wet-armature solenoids S The slip-on coil can be rotated, and it can be replaced without opening the hydraulic envelope S Various plug-connector systems and voltages are available S Can be fitted in a line-mounting body Series MDR32GN… direct acting proportional 3/2 throttle valves are size 5, high performance screw-in cartridges with a 3/4-16 UNF mounting thread. They are designed on the proven sliding-spool principle. The straightforward de sign delivers an outstanding price/performance ratio. In the initial position (de-energised), port 1 is closed and ports 2 3 are connected with the full flow rating. In control mode, the flow through the connection 1 2 is varied in pro portionally to the control current. Three types are available: Type “A” - standard model, for general use with or without compensator. Type “Z” - special model, only approved for use with compensator (max. p 15 bar). Type “S600” - spe cial model with optimised characteristic - Q = f (I), also only suitable for use with compensator. With this model, the con nection 2 3 is only used for unloading (see Performance Graphs). These cartridges are particularly suitable for pre cise and controlled lifting and lowering movements, but they can also be used for reliable operation in mobile and indu strial applications featuring large pressure differences. All external parts of the cartridge are zinc-nickel plated to DIN 50 979 and are thus suitable for use in the harshest operat ing environments. The slip-on coils can be replaced without opening the hydraulic envelope and can be positioned at any angle through 360°. If you intend to manufacture your own cavities or are designing a line-mounting installation, please refer to the section “Related data sheets”. Technical data General characteristics Description, value, unit proportional 3/2 throttle cartridge sliding-spool design, direct acting Mounting method Tightening torque
Open the catalog to page 1General characteristics Description, value, unit nominal size 5, cavity type AM Mounting attitude unrestricted (preferably vertical, coil down) Ambient temperature range Hydraulic characteristics Description, value, unit Maximum operating pressure Maximum flow rate Nominal flow rate 1 2 Leakage flow rate < 150 cm3/min (with pN 250 bar) with oil viscosity 33 mm2/s (cSt) Flow direction Hydraulic fluid HL and HLP mineral oil to DIN 51 524; for other fluids, please contact BUCHER Hydraulic fluid temperature range Viscosity range Minimum fluid cleanliness Cleanliness class to ISO 4406 : 1999...
Open the catalog to page 2Performance graphs measured with oil viscosity 33 mm2/s (cSt) For general use with / without compensator – type “A” p = f (Q) Pressure drop - Flow rate characteristic P0150.ai Q = f (I; p) Flow rate adjustment characteristic Q [l/min] For use with compensator (max. Dp = 15 bar) – type “Z” p = f (Q) Pressure drop - Flow rate characteristic P0152.ai Q = f (I; p) Flow rate adjustment characteristic Q [l/min] P0154.ai 20 Q = f (p; I) Flow rate adjustment characteristic Q [l/min] 20 Performance graphs measured with compensator model DWDPA-5D-10-F06-2
Open the catalog to page 3With optimised characteristic - Q = f (I), type “S600” – with compensator (max. Dp = 15 bar) p = f (Q) Pressure drop - Flow rate characteristic p [bar] 10 Q = f (I; p) Flow rate adjustment characteristic Q [l/min] Q = f (p; I) Flow rate adjustment characteristic Q [l/min] 20 Performance graphs measured with compensator model DWDPA-5D-10-F06-2 Installation information IMPORTANT! To achieve the proportional 3/2 throttle cartridge's maximum performance rating, fit the solenoid coil as shown (with the plug pins at the bottom). When fitting the cartridges, note the mounting attitude...
Open the catalog to page 4Dimensions & sectional view Without manual flow setting – standard 7 3 If necessary, air can be purged from these proportional throttle cartridges by using the cap nut (Item B). The pro cedure is as follows: Backup ring 1. Slacken and remove the knurled nut. Backup ring 2. Slacken the cap nut approx. 1.5 turns. Seal kit with FKM (Viton) seals no. DS-247-V Caution: Slackening the cap nut allows oil to spray out! 3. Switch the proportional throttle cartridge ON/OFF several times until no more air bubbles escape. 4. Tighten the cap nut. 5. Refit the k
Open the catalog to page 5With manual flow setting – Option “E” Integral air-bleeding If necessary, air can be purged from these proportional throttle cartridges by using the integral air-bleed screw (Item D). The procedure is as follows: C Protective cap D Air-bleed screw Steps: 1. Remove the protective cap. 2. Slacken the air-bleed screw approx. 2 turns. 3. Switch the proportional throttle cartridge ON/OFF several times until no more air bubbles escape. 4. Tighten the air-bleed screw. 5. Fit the protective cap.
Open the catalog to page 6Manual flow setting Optionally, the proportional throttle cartridges can be sup plied with an integral manual flow setting. If a proportional solenoid is faulty, for example, this manual flow setting en ables the required flow rate to be set mechanically. This manual flow setting is not designed for adjusting the flow in a dynamic control mode. Setting the flow rate manually Steps: 1. Remove the protective cap. 2. Slacken the lock nut (13 A/F). 3. Screw in (turn to right) the adjusting spindle (4 A/F) until the required flow rate is set. 4. Tighten the lock nut (13 A/F). Restoring the...
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