, /2 Soft start ( soft clutch ) valve

Transcription

1 00, 00 / Soft start ( soft clutch ) valve > > Port size: G > > Ideal for soft starting of the pneumatically operated clutch on presses > > eduction wear and tear > > Noise-reduction > > Compact design > > Simple installation Technical features Medium: Compressed air, filtered μm, lubricated or non-lubricated Suitable oils: Shell Tellus S MA, ExxonMobil Febis K or comparable oil with DVI values < 8 (DIN ISO 87) and ISO viscosity class -6 (DIN 559) Operation: The soft start valve can be used for a soft engagement of the pneumatically operated clutch on presses. It can be directly flanged on port () of the safety valve XS/XSz and with an adapter plate on the XS/XSz 50. It has a interchangeable bypass orifice to adapt to individual operating conditions. Operating pressure:... 8 bar ( psi) Fluid temperature: C ( F) Ambient temperature: C ( F) At temperatures above +5 C (95 F) lubricated air is recommended. Air supply must be dry enough to avoid ice formation at temperatures below + C (+5 F). Materials: Housing: Aluminium Seals:NB and AU Technical data Symbol (A) () (Z) Orifice (mm) Description Operating pressure (bar) min. max. Control pressure (bar) min. max. / valve Weight (kg) Drawing No. Model *) Valve.coil.voltage Valve for 0,6 8 0,6 8 ja, smooth starting from bar 0,6 8 0,6 8 ja, ,6 8 0,6 8 nein, (P) (Z) (P) (A) Valve for 0,6 8 0,6 8 ja, smooth starting up to bar 0,6 8 0,6 8 ja, ,5 8,5 8 nein, (P) *) Standard voltage ( V d.c. and 0 V a.c.), alternative voltages on request All solenoids are supplied without plugs. If connectors are desired, they must be ordered separately, model without notice, the specifications given in this document. (00-56f) 05 Norgren GmbH 0/6 en

2 00, 00 / Soft start ( soft clutch ) valve Solenoid operators Power consumption V d.c. 0 V a.c. (W) (VA) ated current V d.c. 0 V a.c. (m A) (m A) Protection class IP/NEMA Temperature Ambient/Media ( C) 6,9 70 IP 65 (with connector) , 75 IP 65 (with connector) ,9 70 IP 65 (with connector) Electrical connection DIN EN 750-, DIN EN 750-, DIN EN 750- Weight Circuit diagram Model (kg) No. 0, , ,6 00 7, 75 IP 65 (with connector) DIN EN 750-0,5 6 *6) not supplied, see table»accessories«symbol 6 Accessories Adapter plate for flange mounting on XS/XSz The advantages of this control are: Soft application of the clutch disc, thus reducing the noise. Controlled torque transmission reducing clutch wear and tear. Thanks to the pressure control, there is no change in the performance characteristic caused by clutch wear. No need to harmonize clutch volume and volume of pipe lines between clutch and valve. No pipe work thanks to flanged design. Easy to handle Thanks to pressure adjustment, suited for all clutch types. No changes by fluctuations of operating pressure. The solenoid valve M makes a setup operation of the press possible. en without notice, the specifications given in this document. (00-56f) 05 Norgren GmbH 0/6

3 00, 00 / Soft start ( soft clutch ) valve Threshold pressure of clutch from 0... bar Switching diagram and characteristic curve for pressure build-up (Z) (P) XS / XSz Coupling pressure pe M excited M () C D Phase a b t (P) (A) E = Solenoids of pressure safety valve () are excited Sequence valve open esponse pressure of coupling Valve () closed (nozzle D) Threshold pressure of clutch from 0 to bar As shown in Fig. the clutch is vented via the safety valve (). Pressure supply via filter, lubricator and the / control valve (). In this switching condition, however, the clutch is shut off by the safety valve (). As soon as the solenoids of the safety valve () are energized, the clutch is pressurized in the following two stages. a) The closed / directional control causes slow pressure build-up in the clutch via orifice D, to a level where the acceleration phase between flywheel and drive shaft is reached. b) Via line the / directional control valve is switched to the open position initiating a rapid pressure build-up. With the solenoid of the safety valve de-energized, the safety valve exhaust the clutch to the atmosphere and the / directional control valve is switched to closed position. The /-way valve (M) allows the setting operation of the press: after switching the valve Mand the safety valve, the pressure builds directly on port (A) of safety valve (). Therewith the cushioning function of soft start valve is lifted. Threshold pressure of clutch from bar up Switching diagram and characteristic curve for pressure build-up (Z) () XS / XSz Coupling pressure pe M excited M excited M D () C (P) (A) Phase a b c E = Solenoids of pressure safety valve () are excited t Valve () closed (nozzle D) esponse pressure of coupling Sequence valve open Threshold pressure of clutch from bar up As shown in Fig. the clutch is vented via safety valve (). Pressure supply via filter, lubricator and the / directional control valve (). In the switching position shown, however, the clutch is shut off by press safety valve (). As soon as the solenoids of the safety valve () are energized, the clutch is pressurized in three stages: a) Fully open, the / directional control valve causes a quick pressure build-up to the level where engagement pressure of the clutch is reached. At this pressure level, the / directional control valve is open. b) By means of the bypass line D, the further pressure build-up via line can be controlled as the sectional area of this line determines the acceleration period between flywheel and driving shaft. c) At the end of the acceleration phase M is energized, the / directional control valve opens and the pressure in the clutch quickly is raised to the pre-set value to assure the torque transmission from the flywheel to the crank shaft of the press. By de-energizing the solenoid of the safety valve (), the clutch is vented; the / directional control valve () remains in the open position. 0/6 without notice, the specifications given in this document. (00-56f) 05 Norgren GmbH en

4 00, 00 / Soft start ( soft clutch ) valve Drawings ~6 Dimensions in mm Projection/First angle ~ Z G /8 G / Z Z ~95 8,5 97 G / ,5 G G / G ~7 ~6 Z G / G / 8,5 ~95 97 Z Z P G / ,5 M x 6 mm deep G G Draw valve 90 displaced Valve 90 offset mounted en without notice, the specifications given in this document. (00-56f) 05 Norgren GmbH 0/6

5 00, 00 / Soft start ( soft clutch ) valve Adapter plate for mounting on XS/XSz 50 0 Dimensions in mm Projection/First angle M8 60, 0 5 A suitable air treatment unit (dehydration, filtration, lubrication) must be connected upstream of pressure port (P). Lubrication can be omitted if the connected consuming device and all additional equipment is suited for oil-free operation (see page ). Degree of filtration: μm. It is the responsibility of the purchaser and/or installer of the Norgren-Herion safety valves to make sure that the valve and all other components comply with all relevant national regulations and the specifications of the local safety associations. The valve should be checked at intervals depending on the loads to which it is subjected, at least, however, once a year. The relevant tests must be carried out according to the corresponding operation and maintenance instructions of the unit and the local safety regulations. In case of malfunctions the unit has to be tested and/or replaced immediately. All liability is denied for unauthorised modification of the units, installation or usage not in accordance with the manual, the local safety requirements and the principles of DIN EN ISO 89-. Warning These products are intended for use in industrial compressed air systems only. Do not use these products where pressures and temperatures can exceed those listed under»technical features/data«. Before using these products with fluids other than those specified, for non-industrial applications, life-support systems or other applications not within published specifications, consult IMI Precision Engineering, Norgren GmbH Through misuse, age, or malfunction, components used in fluid power systems can fail in various modes. The system designer is warned to consider the failure modes of all component parts used in fluid power systems and to provide adequate safeguards to prevent personal injury or damage to equipment in the event of such failure. System designers must provide a warning to end users in the system instructional manual if protection against a failure mode cannot be adequately provided. System designers and end users are cautioned to review specific warnings found in instruction sheets packed and shipped with these products. 0/6 without notice, the specifications given in this document. (00-56f) 05 Norgren GmbH en