Check-Q-meter. Table of contents. Features. Functions. RE 27551/ /10 Replaces: Type FD

Transcription

1 Check-Q-meter RE /0.0 /0 Replaces: 09.9 Type FD Nominal size... Series ax. Operating pressure 0 bar ax. Flow 0 l/min K9/ Table of contents Contents Page Features Functions Ordering details Symbols Functional description, section Circuit examples Technical data Characteristic curves Unit dimensions to 9 Features For installation in manifolds (cartridge valve) With SE flanged ports For sub plate mounting, porting pattern to DIN 0, form D, ISO 8 and CETOP RP H, sub plates to catalogue sheet RE 0 (separate order) Use sub plate version when valve panel mounting Functions Pilot operated check valve, leak-free The check-q-meter controls the returning flow q V in relation to the flow being directed into the opposite side of the actuator q V. With cylinders the area ratio (q V = q V ϕ) has to be taken into account y-pass valve, free-flow in opposite direction Optional built-on secondary pressure relief valve (only for valve with flange connections)

2 /0 osch Rexroth G FD RE /0.0 Ordering details FD V * Nominal size = Nominal size = Nominal size = Nominal size = For manifold mounting (cartridge valve) = K For sub-plate mounting without secondary PRV = P For SE flange connections without secondary PRV = F For SE flange connections with secondary PRV = F Series 0 to 9 (0 to 9: unchanged installation and connection dimensions)) = V = Further details in clear text FK seals, suitable for mineral oil acc. to DIN (HL, HLP) and phosphate ester (HFD-R) 00 = Without orifice 0 = Orifice Ø 0.0 mm (sizes and ) 0 = Orifice Ø 0.0 mm (size ) 0 = Orifice Ø 0.0 mm (size ) (other orifice diameters on request) Pressure range of the secondary pressure relief valve Valve with SE flange connections (only for version F ) 00 = Pressure setting up to 00 bar 00 = Pressure setting up to 00 bar 00 = Pressure setting up to 00 bar Symbols Without secondary pressure relief valve With secondary pressure relief valve T Valve type: FD K /0.. FD K /0.. FD K /0.. FD K /0.. Valve type: FD P /0.. FD F /0.. FD P /0.. FD F /0.. FD P /0.. FD F /0.. FD P /0.. FD F /0.. Valve type: FD F /.0.. FD F /.0.. FD F /.0.. FD F /.0..

3 RE /0.0 FD osch Rexroth G /0 Functional description, section Check-Q-meters are used in hydraulic systems to influence the speeds of hydraulic motors and cylinders independent of the load (prevents running away). In addition there is an isolator function for pipe burst safety. The check-q-meter comprises basically of the housing (), main poppet (), pilot part (), pilot spool (), damping spool () and pilot damping (). Lifting the load With free-flow from to the main spool () is opened. If the load pressure fails (e.g. pipe break between the directional valve and port ) then the main spool () immediately closes. This function is achieved by the connection of the load side () with chamber (8). Lowering the load (circuit examples) The direction of flow is from to. Port is connected to tank via the directional valve. The piston rod side of the cylinder has a flow applied which corresponds to the working conditions. The relationship between the control pressure at port and the load pressure at port = : 0. When the control pressure is reached the pre-opening of the main spool takes place. Via the control spool () the pilot stage () is lifted off its seat and chamber (8) is decompressed via this drilling and port to tank. t the same time the load pressure in port is no longer applied to chamber (8), this is due to the longitudinal movement of the pilot stage () within the main spool. The main poppet () is thereby unloaded. The reverse side of the control spool () at the main poppet (), lies against the collar of the damping spool (). The pressure required at port to open to is now only influenced by the spring in chamber (9). The pressure required to begin opening the connection to is 0 bar; to fully open the connection 0 bar is required. The opening cross-section for flow control increases progressively. It is created by the successive opening of radial drillings in the bush and the main poppet () land. The relationship between the control pressure, cracking pressure and differential pressure determines the flow to the actuator via the connection of to. Thus uncontrolled running away of the actuator is prevented. The controlled lowering procedure is not affected even if there is a pipe burst between the directional valve and port. Guidelines for influencing the opening and closing times of the check-q-meter. Throttling of the opening sequence is via orifice ( ) in the control spool () and both sides of the damping spool (). The orifice () is protected by sieves. The closing movement of the check-q-meter is virtually un-throttled. When being used in conjunction with cylinders the control line to port can be fitted with a throttle check valve (meter-out control) to influence the closing sequence. When being used in conjunction with motors a throttle check valve should not be fitted in the control line to port. In this case it is recommended that the control times of the directional valve are influenced. rr 9 T 8

4 /0 osch Rexroth G FD RE /0.0 Circuit examples Differential cylinder On safety grounds, a closed centre directional valve should always be used! Hydraulic motor So that the holding brake can operate both of the direction all valve ports have to be connected to port T in the deenergized position. If the brake is externally unloaded then it is possible to use a closed centre directional valve in the de-energized condition. Note! Two check-q-meters cannot be used to control two cylinders which are forced mechanically to move together, as synchronisation and the same pressure cannot be guaranteed in each cylinder. ff Therefore, the cylinders have to be equipped with two pilot operated check valves, type SL. The check-q-meter is fitted in a common line. ff In this case, the load pressure must not exceed 00 bar! Y

5 RE /0.0 FD osch Rexroth G /0 Technical data (For applications outside these parameters, please consult us!) ax. operating pressure at port, bar 0 bar 0 Pilot pressure at port: bar min. 0 to 0 (flow control range)) max. 0 Cracking pressure to bar Setting pressure for secondary pressure relief valve bar 00 Flow l/min 80 (size ), 00 (size ), 0 (size ), 0 (size ) rea ratio of the pre-opening poppet seat area = area of pilot spool 0 Hydraulic fluid ineral oil (HL, HLP) according to DIN, phosphate ester (HFD-R) Hydraulic fluid temperature range C 0 to +80 Viscosity range mm /s 0 to 800 Degree of contamination (maximum permissible) ISO 0 (C) class 0/8/ Characteristic curves (measured at ν = mm²/s and ϑ = 0 C) p Pressure differential in bar Pressure differential Δp in relation to flow qv, measured at throttle position: Throttle fully open (p x = 0 bar) to Pressure differential in bar q v Flow in l/min p q v Flow in l/min Size Size Size Size Pressure differential Δp in in relation to flow q v, measured over the check valve to

6 /0 osch Rexroth G FD RE /0.0 Unit dimensions: Valve for assembly into manifolds (cartridge valve) (Dimensions in mm) Ø, G / ØD +0, ØD +0, D y y +0, L0 L Ø 0,0 L 0, 0 ØD H8 ØD +0, R, x ØD x x ØD8 L +0, L L 0, L ±0, L ±0, L8 L9 L Ø D8 L ±0, 0 D9; T R, ØD Control port Name plate Tightening torque T of cartridge valve: for size : Nm size : 0 Nm size : Nm size : 0 Nm ±0, Ports and can be optionally arranged about the circumference. ttention! The valve fixing holes must not be damaged. Pipe threads G acc. to ISO 8/ Type D D D D D D D D8 D9 T L L L L L L FD K / x FD K / x FD K / x FD K /... 9 x Type L L8 L9 L0 L L Valve fixing screws/ Weight tightening torque T in Nm FD K / pieces 0 x 0 DIN kg FD K / pieces 0 x 0 DIN kg FD K / pieces x 80 DIN kg FD K / pieces x 00 DIN kg

7 RE /0.0 FD osch Rexroth G /0 Unit dimensions: For SE flange connections, without secondary pressure relief valve (Dimensions in mm) Ø D; T Ø D Ø ; G / Ø ; G / H H L L Ø D Ø D L L Ø D; T () L L SE flange connection: L Operating pressure 000 PSI (0 bar) Flange mounting screws and blanking flange are included within the scope of supply. Control port easuring port Flange fixing screws lanking flange Optional port Name plate O-ring Pipe thread G acc. to ISO 8/ Type D D D D D H H FD F / FD F / FD F / FD F / Type L L L L L L T T Weight O-ring () FD F / kg x. FD F / kg x. FD F / kg.9 x. FD F / kg. x.

8 8/0 osch Rexroth G FD RE /0.0 Unit dimensions: For SE flange connections, with secondary pressure relief valve (Dimensions in mm) 8 Ø D; T Ø ; Ø D; T Ø D G / D Ø ; G / T H H H L8 L Ø D Ø D L L L Ø D; T () T SE flange connection: Operating pressure 000 PSI (0 bar) Flange mounting screws and blanking flange are included within the scope of supply. L L L L Control port easuring port Flange fixing screws lanking flange Optional port Name plate O-ring Secondary pressure relief valve Pipe thread G acc. to ISO 8/ Type D D D D D D D H H FD F / G / FD F / G / FD F / G /. 90 FD F / G / Type H L L L L L L L L8 T T T Weight O-ring () FD F / kg x. FD F / kg x. FD F / kg.9 x. FD F / kg. x.

9 RE /0.0 FD osch Rexroth G 9/0 Unit dimensions: For sub plate mounting (Dimensions in mm) Ø ; G / H H H Ø L L8 L L Ø ; G / Sub plates to catalogue sheet RE 0 must be ordered separately. Sub plates for: sizes and size size G 0/0 (G /8) G /0 (G /) G /0 (G /) G /0 (G /) G /0 (G ) G /0 (G /) Note! Only use a sub plate mounting valve for panel mounting! Control port easuring port L L L L L Locating pin Ø Not for sizes, and 0,0/00mm R max Required surface finish of mating plugs Four valve fixing holes for sizes, and, six valve fixing holes for size Name plate Pipe thread G acc. to ISO 8/ Type H H H L L L L L L FD P / FD P / FD P / FD P / Type L L8 Valve fixing screws/tightening torque T in Nm Weight O-ring () FD P /... 0 pieces 0 x 00 DIN kg. x. FD P /... 0 pieces 0 x 00 DIN kg. x. FD P / pieces 0 x 0 DIN kg 9.8 x. FD P /... 9 pieces 0 x 0 DIN kg 8 x

10 0/0 osch Rexroth G FD RE /0.0 Notes osch Rexroth G obile pplications Zum Eisengießer 98 Lohr am ain, Germany Phone +9 (0) 9 / 8-0 Fax +9 (0) 9 / 8-8 info.brm-mc@boschrexroth.de This document, as well as the data, specifications and other information set forth in it, are the exclusive property of osch Rexroth G. Without their consent it may not be reproduced or given to third parties. The data specified above only serve to describe the product. No statements concerning a certain condition or suitability for a certain application can be derived from our information. The information given does not release the user from the obligation of own judgment and verification. It must be remembered that our products are subject to a natural process of wear and aging. Subject to change.