p^cfj= HYDRAULIC BRAKES AND SERVO-ASSISTED BRAKE SYSTEMS 3 Priority Levels Steering Protection Accumulators' Charge In-line Assembly Flanged Assembly

Transcription

1 3 riority Levels rotection HYDAULC BAKE AND EVO-AED BAKE YEM MAE OY VALVE s' Charge n-line Assembly langed Assembly p^cfj=.p.a. Via Livingstone 6 info@safim.it MODENA - ALY

2 NDEX NODUCON AND GENEAL EAUE MAE OY VALVE 80 L/MN MAE OY VALVE 160 L/MN LANGED MAE OY VALVE

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4 MAE OY VALVE MAE OY VALVE : GENEAL EAUE his hydraulic valve has been designed in order to convey a pump flow to various services on three priority levels, with low pressure drops on the valve. On the highest priority level (1) you will usually find applications whose failure to function causes problems for both vehicle and operator; on the second priority level (2) you will find safety devices that ensure a minimum level of endurance up to a certain extent in the absence of feeding, as well as the services necessary for the vehicle functioning; finally on the third level you will find applications that don't require any priority and whose failure to function doesn t arouse any danger neither to operator nor to the vehicle. n case the pump flow is enough to satisfy the whole hydraulic equipment at the same time, the master priority valve will remain completely open. he valve protects applications at a higher priority level from excess requests, failures or breakdowns that may take place on services belonging to a lower priority level. here are two main kinds of Master riority Valve : he larger one has the main spool diameter of 22 mm, and allows a maximum flow rate of 160 l/min. he smaller one has the main spool diameter of 16 mm, and it's designed for a maximum flow rate of 80 l/min. Hydraulically, the two systems are equivalent. Master riority Valve 80 L/min Master riority Valve 160 L/min

5 MAE OY VALVE MAE OY VALVE OEAON he valve has three-levels priority valve (1), controlling the oil flow to the steering, to an accumulators charging valve and the exceeding flow, so that the steering is on a priority level in respect to other services and the accumulators charging valve is on a priority level in respect to the exceeding flow, but not to the steering. he group may be connected to a closed centre steering system and contains a valve (2) protecting it from overpressures generated by other services. he accumulators charging valve (3) keeps the accumulators pressure value within a certain range, that may be set according to the manufacturer s needs. he accumulators are also charged by means of the pressure coming from other services up to a maximum value, beyond which the valve confines the accumulators, in order to avoid overpressures. OONAL EVCE ALE BAKE VALVE O he valve can be equipped with two additional ports B and L B (output and inlet for L.. signal) to feed a load sensing valve at the same priority level of the accumulator charging valve. his output is not compensated, therefore it receives also the pressure generated from the other applications. B and L B are the typical ports for feeding load sensing trailer brake valves. OLENOD VALVE O AKNG BAKE he group has been designed to allow the assembly of a 3-ways solenoid valve for the parking brake (5). OLENOD VALVE O A UNLOADNG t may be possible to include a 2-ways solenoid valve functioning as a start unloading valve, that may electrically disable the accumulators charge when the engine is being started. EEDNG VALVE O EVO LO EUE AND LOW EUE EVCE his device mainly acts as a pressure limiting valve, but it has the possibility to convey a signal to the master priority valve in order to bring pressure at the minimum requested level. EMEGENCY EENG ACCUMULAO his function consists in a supplementary accumulator, separated from the main one by a check valve and connected with the steering spool. t permits to have a pressurized oil back up to be used in case of failure of the system, making a fully-functional emergency steering.

6 MAE OY VALVE YCAL HYDAULC CCU CLOED CENE CCU (LOAD ENNG) All hydraulic equipment connected to the circuit must be closed centre type with Load ensing signal output. n this system the pump displacement and pressure are dependent on the Load ensing signals coming from the different services. he pump feeds all hydraulic equipments until it reaches its max. displacement and the valve is being kept completely open, thus minimizing any pressure drops and without interfering with the circuit. When the flow demand exceeds the feeding pump flow, the Load ensing signals coming from priority services can pilot the master priority valve in order to reduce, bringing to zero, the flow towards auxiliary circuits. f the L signal comes from main priority services, the master priority valve reduces, bringing to zero, the flow for the second level priority. OEN CENE CCU Hydraulic equipment connected to priority levels 1 and 2 must be closed centre type (Load ensing), whereas the ones that are not connected to priority levels () must be of the open center type (crossing). n this system with fixed displacement pump, the master priority valve continuously ensures a min. pressure difference between pressure entering the valve and the L signal from the priority applications. When a priority application requires oil, it will convey a pressure signal and the master priority valve will reduce the flow towards port, up to reaching the required pressure. f the application is on the first priority level and the passage closure towards port is not enough to generate the pressure necessary for the application, the master priority valve reduces and if necessary closes the passage towards the second priority level services.

7 MAE OY VALVE ELECON OBLE he Master priority valve features are defined by the technical card: unction code for "MAE OY VALVE ". lease find below some guidelines helping you to fill the technical data sheet. Not all combinations are possible; should you have any questions, please don t hesitate to contact us. he final order part number will be given by AM. 1) HOUNG YE 16A Master riority Valve D.16 (max low ate 80 l/min) 22A Master riority Valve D.22 (max low ate 160 l/min) 2) HEADED O hreading type O 6149 hreading type AE J475 3) AEMBLY YE L B n line assembly (tandard Versions) langed assembly on the pump (Connection 1" AE in bottom face) langed on AM 6 Brake ystem (Only for housing 16A type) 4) EAL YE eal type luid emperature NB (tandard) V Viton Contact AM C Low emperature Contact AM 5) OEANG EUE Casting Material Maximum ressure Hydraulic Cast ron H pheroidal Cast ron Contact AM 6) OHE O ' ressure switch on - Without port (tandard)

8 MAE OY VALVE ENG AAMEE MAE) WAY O MANAGNG HE OY LEVEL he master spool determines the various priority levels. MAE ype etting (Bar) M1 M2 L OU emarks 22A ype 22A tandard etting (bar) : tand by pressure tandard: 7-10 M1: low restrictor diameter M1 (mm) or standard diameter D=1.5 mm, write: - M1: low restrictor diameter M2 (mm) or standard diameter D=1.5 mm, write: - L OU (L.. output for pump) Y With L OU (tandard) N Without L OU ) COMENAO O EENG Compensator protecting the steering from overpressures generated by other services. ype etting (Bar) emarks LA ype LA tandard etting (bar) : Compensator setting pressure tandard: : low restrictor diameter 1 (mm) or standard diameter D=1.0 mm, write: - 2: low restrictor diameter 2 (mm) or standard diameter D=1.5 mm, write: - 3: estrictor diameter for dynamic flow 3 (mm) or standard diameter D=0.8 mm, write: - or non dynamic flow write N When pressure is controlled by the steering, the compensator doesn t work. f the feeding is at a higher pressure than the one required by the steering unit, the compensator limits the output pressure to the load sensing signal plus the compensator setting. Attention: he steering unit must be of the Load ensing type with built-in pressure relief valve.

9 MAE OY VALVE VCA) ACCUMULAO CHAGNG VALVE he accumulator charging valve is a load sensing type and is usually connected on a second priority level. VCA ype etting (bar) A1 (flow) pring (AM) emarks ype 23A tandard etting (bar): (*) nitial (CU-N) charging pressure. _ Diameter restrictor A1 (mm): et the flow to accumulators. Diameter 2.5 tandard - inal (CU-O) charging pressure. low (l/min) etting spring of accumulator charging valve: he setting pressure range and the pressure defference between initial and final accumulator charge pressure depends on the setting spring. pring CU-N pressure setting (bar) Jump pressure (bar) A (step 10 bar) * (*) he pressure jump between initial and final charge is being selected among the ones available. he initial charge pressure is being adjusted by means of AM spring; the pressure jump between initial and final charge it depends not only from AM spring, but also on stroke limiting device (fix setting defined by the AM). he accumulators are being charged by the pressure generated by other services as well; the valve closes to protect the accumulators from overcharging at about bar higher than the final charge pressure.

10 MAE OY VALVE VE) OLENOD VALVE O AKNG BAKE Normally open solenoid valve for parking brake. 3 VE ipo NA0 tandard - lugged ype etting (Volt) Connector Manual ort 4 emarks etting (Volt): operating voltage 0 12 Volt 3 27 Volt - lugged Connector: ype of solenoid connector Connector type Description DN DN (tandard) 4 X X Manual override Y With manual override - Without manual override (tandard) ort 4: Check valve and port for parking brake accumulator. 4 With port 4 - Without port 4 2VE) A UNLOADNG VALVE he start unloading valve disables the accumulators charge when the engine is being started. 2 VE ypo NC0 tandard - lugged ype etting (Volt) Connector Manual emarks etting (Volt): operationg voltage 0 12 Volt 3 27 Volt - lugged Connector: ype of solenoid connector Connector type Description DN DN (tandard) Manual override: Y With manual override - Without manual override (tandard) AENON: When the engine is being started, the accumulator charging valve is not active and the service brake is not working. t is therefore necessary that the parking brake is inserted at this stage.

11 MAE OY VALVE B) LOAD ENNG OUU WHOU COMENAO ype B - emarks he output without compensator is suitable for feeding Load ensing applications that work with the pressure generated from other services. his output is on a second priority level in parallel with the accumulator charging valve and is accompanied by a second selecting valve. his output can be used to feed a closed centre type railer Brake Valve.

12 MAE OY VALVE UNCON CODE ECHNCAL CAD

13 MAE OY VALVE 80 L/min cod Compensator / Charging Valve / L CONNECON M18x1.5 O 6149 Load sensing from steering pressure switch M10x1 O 6149 ank M18x1.5 O 6149 ECHNCAL EAUE Working emperature 80 l/min ODE A NUMBE HYDAULC CHEMAC L Charging Valve Cut-in pressure (pag )

14 MAE OY VALVE 80 L/min cod Compensator / Charging Valve - railer Brake / L B L B CONNECON M18x1.5 O 6149 Load sensing from steering M12x1.5 O 6149 pressure switch M10x1 O 6149 ank M18x1.5 O 6149 railer Brake feeding M18x1.5 O 6149 L.. from railer Brake M12x1.5 O 6149 ECHNCAL EAUE Working emperature 80 l/min ODE A NUMBE HYDAULC CHEMAC L Charging Valve Cut-in pressure (pag )

15 MAE OY VALVE 80 L/min cod Compensator / Charging Valve - arking Brake / L X X1 CONNECON M18x1.5 O 6149 Load sensing from steering M12x1.5 O 6149 pressure switch M10x1 O 6149 ank M18x1.5 O 6149 arking Brake arking brake pressure switch M10x1 O 6149 ECHNCAL EAUE Working emperature 80 l/min ODE A NUMBE HYDAULC CHEMAC L / 0-60 Charging valve Cut-in pressure (pag ) 0 olenoid 12V 3 olenoid 27V

16 MAE OY VALVE 80 L/min cod Compensator / Charging Valve - arking Brake - railer Brake / L X X1 B L B CONNECON M18x1.5 O 6149 Load sensing from steering M12x1.5 O 6149 pressure switch M10x1 O 6149 ank M18x1.5 O 6149 arking Brake arking brake pressure switch M10x1 O 6149 eeding for railer Brake M18x1.5 O 6149 L.. from railer Brake M12x1.5 O 6149 ECHNCAL EAUE Working emperature 80 l/min ODE A NUMBE HYDAULC CHEMAC L / 0-70 Charging valve Cut-in pressure (pag ) 0 olenoid 12V 3 olenoid 27V

17 MAE OY VALVE 80 L/min cod Compensator / Charging Valve - arking Brake (educed ressure) / L C C1 CONNECON M18x1.5 O 6149 Load sensing from steering M12x1.5 O 6149 pressure switch M10x1 O 6149 ank M18x1.5 O 6149 arking Brake (educed) arking brake pressure switch M10x1 O 6149 ECHNCAL EAUE Working emperature 80 l/min ODE A NUMBE HYDAULC CHEMAC L / Charging valve Cut-in pressure (pag ) 0 olenoid 12V 3 olenoid 27V

18 MAE OY VALVE 80 L/min cod Compensator / Charging Valve with tart Unloading / L CONNECON M18x1.5 O 6149 Load sensing from steering pressure switch M10x1 O 6149 ank M18x1.5 O 6149 ECHNCAL EAUE Working emperature 80 l/min ODE A NUMBE HYDAULC CHEMAC L / Charging valve Cut-in pressure (pag ) 0 olenoid 12V 3 olenoid 27V

19 MAE OY VALVE 80 L/min cod Compensator with Emergency / Charging Valve / L CONNECON M18x1.5 O 6149 Load sensing from steering pressure switch M10x1 O 6149 ank M18x1.5 O 6149 accumulator ECHNCAL EAUE Working emperature 80 l/min ODE A NUMBE HYDAULC CHEMAC L Charging Valve Cut-in pressure (pag )

20 MAE OY VALVE 160 L/min cod Compensator / Charging Valve / L OU L CONNECON M27x2 O 6149 Load sensing to pump Load sensing from steering pressure switch M10x1 O 6149 M27x2 O 6149 ank 1"1/16-12 AE#12 1"1/16-12 AE#12 ECHNCAL EAUE Working emperature 160 l/min ODE A NUMBE HYDAULC CHEMAC L Charging Valve Cut-in pressure (pag )

21 MAE OY VALVE 160 L/min cod Compensator / Charging Valve - railer Brake / L OU L B L B CONNECON M27x2 O 6149 Load sensing to pump Load sensing from steering pressure switch M10x1 O 6149 M27x2 O 6149 ank railer Brake feeding M18x1.5 O 6149 L.. from railer Brake M12x1.5 O "1/16-12 AE#12 1"1/16-12 AE#12 ECHNCAL EAUE Working emperature 160 l/min ODE A NUMBE HYDAULC CHEMAC L - 60 Charging Valve Cut-in pressure (pag )

22 MAE OY VALVE 160 L/min cod Compensator / Charging Valve - arking Brake / L OU L X X1 CONNECON M27x2 O 6149 Load sensing to pump Load sensing from steering pressure switch M10x1 O 6149 M27x2 O 6149 ank arking Brake arking brake pressure switch M10x1 O "1/16-12 AE#12 1"1/16-12 AE#12 ECHNCAL EAUE Working emperature 160 l/min ODE A NUMBE HYDAULC CHEMAC L / 0-90 Charging valve Cut-in pressure (pag ) 0 olenoid 12V 3 olenoid 27V

23 MAE OY VALVE 160 L/min cod Compensator / Charging Valve - arking Brake - railer Brake / L OU L X X1 B L B CONNECON M27x2 O 6149 Load sensing to pump Load sensing from steering pressure switch M10x1 O 6149 M27x2 O 6149 ank arking Brake arking brake pressure switch M10x1 O 6149 eeding for railer Brake M18x1.5 O 6149 L.. from railer Brake M12x1.5 O "1/16-12 AE#12 1"1/16-12 AE#12 ECHNCAL EAUE Working emperature 160 l/min ODE A NUMBE HYDAULC CHEMAC L / 0-80 Charging valve Cut-in pressure (pag ) 0 olenoid 12V 3 olenoid 27V

24 MAE OY VALVE 160 L/min cod Compensator / Charging Valve - arking Brake (educed ressure) / L OU L C C1 CONNECON M27x2 O 6149 Load sensing to pump Load sensing from steering pressure switch M10x1 O 6149 M27x2 O 6149 ank arking Brake (educed) arking brake pressure switch M10x1 O "1/16-12 AE#12 1"1/16-12 AE#12 ECHNCAL EAUE Working emperature 160 l/min ODE A NUMBE HYDAULC CHEMAC L / Charging valve Cut-in pressure (pag ) 0 olenoid 12V 3 olenoid 27V

25 MAE OY VALVE 160 L/min cod Compensator / Charging Valve with tart Unloading / L OU L CONNECON M27x2 O 6149 Load sensing to pump Load sensing from steering pressure switch M10x1 O 6149 M27x2 O 6149 ank 1"1/16-12 AE#12 1"1/16-12 AE#12 ECHNCAL EAUE Working emperature 160 l/min ODE A NUMBE HYDAULC CHEMAC L / Charging valve Cut-in pressure (pag ) 0 olenoid 12V 3 olenoid 27V

26 MAE OY VALVE 160 L/min cod Compensator with Emergency / Charging Valve / L OU L CONNECON M27x2 O 6149 Load sensing to pump Load sensing from steering pressure switch M10x1 O 6149 M27x2 O 6149 ank accumulator 1"1/16-12 AE#12 1"1/16-12 AE#12 ECHNCAL EAUE Working emperature 160 l/min ODE A NUMBE HYDAULC CHEMAC L Charging Valve Cut-in pressure (pag )

27 LANGED MAE OY VALVE cod Compensator / railer Brake / L OU L B L B L B CONNECON langed AE 1" langed AE 1" Load sensing to pump M12x1.5 O 6149 M18x1.5 O 6149 Load sensing from steering M12x1.5 O 6149 railer Brake feeding langed langed L.. from railer Brake langed langed M27x2 O "1/16-12 AE#12 L.. from exceeding flow M12x1.5 O 6149 railer Brake ank langed langed ank ECHNCAL EAUE Working emperature 140 l/min ODE A NUMBE HYDAULC CHEMAC

28 LANGED MAE OY VALVE cod Compensator / Charging Valve / LOU1 LOU2 L -E CONNECON langed AE 1" langed AE 1" Load sensing to pump M12x1.5 O 6149 Load sensing to pump M12x1.5 O 6149 M18x1.5 O 6149 Load sensing from steering diagnostic M27x2 O "1/16-12 AE#12 ank ECHNCAL EAUE Working emperature 140 l/min ODE A NUMBE HYDAULC CHEMAC Charging Valve Cut-in pressure (pag )