Meter out pressure compensator Sandwich plate design Type SCA... /Series X Sizes 6, 5 up to 35 bar up to 35 L/min RE 9 47/.96 RE 9 47/.96 Replaces: 9.87 Sandwich plate design Load compensation in lines A + B, or only A, or only B, used in conjunction with a pilot operated proportional directional valve Leak tight closing in one or both service lines Connection dimensions to DIN 4 3 Form A, ISO 4 and CETOP-RP H K 37/5 Type SCA 6 CZX/.. Description of function, Section This valve is used in conjunction with a proportional directional valve to form a meter out flow control circuit to control both negative and positive loads. Service ports A and B may be locked to support loads. The value and direction of an oil flow can be set at the potentiometer controlling the proportional directional valve. If, for example, the pump is directed to port A, oil flows via valve set (.) to the actuator. Valve set (.) in this case, functions as a non return valve. At the same time, a pilot oil flow is taken from the main oil flow, and passes through the pilot piston (4.) (acting as a pressure compensated flow control), into chamber (5). This pilot flow causes a pressure to build up at the relief valve (3), and an the pilot piston (4.), via orifice (7), on the B side. In addition, the outlet of the pressure relief valve is connected to the T port of the main valve. The unloading poppet (8) thus cuts off the connection to the load pressure. The pressure before the proportional valve is then present in chamber (9) via the pressure take off at the unloading poppet (8). Pressure is also present on both the full bore and the annulus sides of the opening piston (4.) The pressure drop from B to T via the proportional directional valve is thus held constant. This pressure drop in controlled by land (), and is the pressure in chamber () minus the spring (). The force of spring (3) plays no part at this stage. When the pump pressure is directed to port B, valve set (.) operates in exactly the same way in port A. Detail "Z" Type SCA 6 CZX/.. /6
RE 9 47/.96 Simplified symbols (Subscripts: = Component Side, = Mounting Interface Side) Type SCA.. AZX/... Type SCA.. BZX/... Type SCA.. CZX/... PX A B LYT PX A B LYT PX A B LYT Typical circuit (detailed) Operation in lines A and B Load Ordering Code Meter out pressure compensator = SCA Size 6 = 6 Size 5 = 5 Operation in line A Operation in line B Operation in lines A and B = A = B = C Special insulations on request! Valve types which result from the order variations in the grey-shaded areas are available at short notice! SCA Z X * Z = X = M = V = Further details in clear text NBR seals, suitable for mineral oil to DIN 5 54 (HL, HLP) FPM seals, suitable for phosphate ester (HFD-R) Series to 9 ( to 9: installation and connection dimensions remain unchanged) Sandwich plate design /6
Technical Data (For applications outside these parameters, please consult us!) RE 9 47/9.87 Operating Pressure: Ports A, A, B, B, p max 35 bar Warning: When used with single rod cylinders, beware of intensification. Ports T, T separat to tank Ports X, X max. 35 bar Ports Y, Y max. 3 bar Flow: } Size 6 max. 3 L/min Size 5 max. 35 L/min Min. pressure differential: see diagrams Flow resistance: pages 3,4 and 5 Dynamic charact: (measured at a load pressure of 5 bar with prop. valve type 4WRZ 6 5 E ) 5 35 Size Response in % ) (type 4WRZ... + type SCA...) q V min to q V max T u +T g in ms q V max to q V min T u +T g in ms 6 5 to to 7 5 to 75 5 to 75 3 7 ) % input signal = 7 ma Solenoid current T g = setting time T u = signal delay Pilot oil volume from pressure relief valve to tank: for size 6 max.,8 L/min for size 5 max.,5 L/min Pressure/Flow relationship: see diagrams pages 4 and 5 Fluids: Mineral oil to DIN 5 54 (HL, HLP) Phosphate ester (HFD-R) Maximum degree of contamination of the fluid to NAS 638 classes 7 to 9. We therefore recommend a filter with a minimum retention rate of β 75. Fluid temperature range: to + 7 C Viscosity range: 5 to 3 mm /s Installation position: optional Weights: Size 6 6, kg Size 5,3 kg Good settling characteristics are achieved with systems having natural frequencies > 4 Hz. Operation Curves (measured at ν = 4 mm /s and t = 5 C) Pressure difference p min ) in bar Minimum differential pressure p = f (q V ) Start of control Start of control 35 35 Size 6 Size 5 3 3 5 5 5 Flow compensating range Resistance to flow 6 3 Pressure difference p min ) in bar 5 5 5 Flow compensating range Resistance to flow 6 35 ) p min = p M3b p M4 (For test points M3b, M4 see page ) 3/6
RE 9 47/9.87 Operating Curves (measured at ν = 4 mm /s and t = 5 C) Size 6 Resistance in flow: Pressure difference in bar Resistance to flow p = f (q V ) 6 4 8 6 4 3 5 6 7 9 3 Non return valve function (Test point: Ma - Mb or M3a - M3b) ) Resistance to flow at proportional directional valve input land (Test point: M - Ma or M4 - M3a) ) In the one side model, no compensator in A,the resistance to flow in the A line M - Ma (8 bar). In the one side model no compensator in B, the resistance to flow in the B line M3a - M4 (8 bar). Flow/Pressure relationship q V = f ( + command value); command value constant 3 -Test point M3b ) in 87 % = ^ 6 ma ports A and B. 6 % = ^ 56 ma 7 % = ^ 49 ma 6 % = ^ 4 ma The diagram refers to a spool for 5 L/min nominal flow (Valve Type 4WRZ 6 E5..) 5 % = ^ 35 ma 6 3 35 Operating pressure in bar at test point: M3b ) Flow controlling - command value/flow q V = f (command value) 3 6 Meter out pressure compensator Type SCA 6... with proportional directional valve Type 4WRZ 6 E... Type 4WRZ 6 E5... (P A, B T) Curve q V = f (command value) in ports A and B; = 5 bar constant at test point M3b ) 6 Opening point 3 command value in % ) see cicuit page 4/6
Operating Curves (measured at ν = 4 mm /s and t = 5 C) RE 9 47/9.87 Size 5 Resistance to flow p = f (q V ) Resistance to flow: Non return valve function 35 (Test point: Ma - Mb or M3a - M3b) ) 3 5 Resistance to flow at proportional directional valve input land (Test point: M - Ma or M4 - M3a) ) 5 In the one sided model, no compensator in A the 5 resistance to flow in the A line M - Ma (8 bar). 6 35 In the one sided model, no compensator in B the resistance to flow in the B line M3a - M4 (8 bar). Pressure difference in bar 35 6 Flow/Pressure relationship q V = f ( + command value); command value constant % = ^ 7 ma % = ^ 56 ma 7 % = ^ 49 ma 6 % = ^ 4 ma -Test point M3b ) in ports A and B. The diagram refers to a spool for 35 L/min nominal flow (Valve Type 4WRZ 5 E35...) 5 % ^= 35 ma 6 3 35 Operating pressure in bar at test point: M3b ) Flow controlling - input signal/flow q V = f (command value) 35 Meter out pressure compensator Typw SCA 5... with proportional directional valve Type 4WRZ 5 E35... (P A) 6 Curve q V = f (command value) = 5 bar constant at test point M3b ) 6 Opening point 3 command value in % ) see circuit on page 5/6
RE 9 47/.96 Unit dimensions (in mm) Size 6 Nameplate 6 thro' holes for fixing screws 3 R-rings for ports A, B, P, T Size 6 R-ring,53 x,3 x,6 Size 5 R-ring 7,8 x,6 x 3, 4 R-rings for ports X, Y, L Size 6 R-ring x, x, Size 5 R-ring 9 x 3, x 3, 5 Locating pin 6 Drilling for locating pin 7 Valve operational in port A (Type SCA.. AZX/...) 8 Valve operational in port B (Type SCA..BZX/...) 9 Valve operational in port A and B (Type SCA..CZX/...) Pressure relief valve Size 5 Required surface finish of mating piece,/mm R max 4 Mannesmann Rexroth GmbH D-9783 Lohr am Main Jahnstraße 3-5 D-9786 Lohr am Main Telefon 93 5 / 8- Telefax 93 5 / 8- Telex 6 89 48- Mannesmann Rexroth Limited Cromwell Road, St. Neots, Huntingdon, Cambs. PE9 ES Tel: (4) 4764 Fax: (4) 95 6/6 The specified data is for product description purposes only and may not be deemed to be guaranteed unless expressly confirmed in the contract. All rights reserved Subject to revision