Loop Flushing Valve. Lenntech. Technical Information. Tel Fax

Transcription

1 MAKING MODERN LIVING POSSIBLE Lenntech Tel Fax

2 Revision history Table of revisions Date Change Rev Dec 2014 Danfoss Layout EA Oct 2011 Backpage upate AB Mar 2007 Upate backpage AA July 2003 First eition L0641 Rev EA Dec 2014

3 Contents General information Service Information Application...4 Description...4 Specifications...5 Moel coe... 5 Performance... 5 Mounting...6 Ajustment proceure... 8 Service information L0641 Rev EA Dec

4 General information Application The loop flushing valve, applie in a hyrostatic transmission circuit, maintains high quality of the working flui in the transmission power loop. While many transmissions can operate satisfactorily without a loop flushing valve, the aition of loop flushing improves flui quality an generally extens transmission life. Consier the loop flushing valve when any of these exist: Sustaine operation at low pressure an high spee Operation where continuous pressure excees 1000 hours per year Cyliners in the hyrostatic circuit Flow restricting valves in the power loop Frequent operation of high pressure relief valves Long power loop lines Extraorinary life requirements Danfoss recommens monitoring flui quality uner fiel operating conitions for extene perios of time to etermine loop flushing requirements. For a complete iscussion of loop flushing an flui quality, refer to Danfoss bulletins BLN-9886 Transmission Circuit Recommenations an 520L0463 Hyraulic Fluis an Lubricants,. Description The high pressure ports (1 an 2) of the valve are externally connecte to the work or system auxiliary ports of the main hyrostatic transmission circuit. The valve rain port (4) must be externally connecte to the case rain return line of the transmission preferably at the motor so that flui flushes through the motor case an returns to the reservoir. The shuttle valve exposes the low pressure sie of the circuit to the charge relief valve. When properly set (see Ajustment proceure on page 8) the charge relief valve flushes a esire quantity of working flui from the transmission power loop. The charge pump replaces this flui. You may specify a rain orifice to limit maximum flushing flow in circuits where the low sie pressure is high or varies over a large range. Schematic iagram System press. gauge port 5 X Orifice (optional) Drain port 4 System port 1 X Charge press. gauge port 3 X System port 2 System press. gauge port 6 P E 4 520L0641 Rev EA Dec 2014

5 General information Specifications System pressure Maximum high sie Maximum low sie 480 bar [6961 psi] 70 bar [1015 psi] Charge relief setting Minimum Maximum 15 bar [218 psi] 28 bar [406 psi] Nominal charge relief settings are ±1.4 bar [±20 psi] an are set at a flow of 3.8 ±0.9 l/min [1 ±0.25 US gal/ min] at 49º C [120º F] Moel coe Charge pressure 15 to 28 bar, 1 bar increments Example: 20 = 20 bar [290 psi] Orifice 00 = None 09 = Ø 2.40 mm [ in.] 12 = Ø 3.19 mm [ in.] Performance Valve without orifice Low system pressure (above rain) (psi) Maximum setting 1 2 Ajustment range 3 Flow 4 Minimum setting (l/min) (bar) (US gal/min) P E 520L0641 Rev EA Dec

6 General information Valve with 2.40 mm [ in.] orifice Low system pressure (above rain) (psi) Maximum setting 1 2 (l/min) Flow 3 Ajustment range 4 Minimum setting 5 (bar) (US gal/min) P E Mounting Installation rawing Ajustable charge relief valve 1-1/16 in hex (locknut) 1/2 in hex (ajustment) 9/16 in-18 SAE str. th. O-ring boss system pressure gauge port [2.38] 95.0 [3.74] 87.6 [3.45] 78.2 [3.08] 36.8 [1.45] 21.3 [0.84] 14.0 [0.55] 36 max [1.417] 80.8 [3.18] 8.6 [0.34] 73.7 [2.90] 9/16 in-18 SAE str. th. O-ring boss rain port [0.625] typical 15.2 [0.60] Ø 10.7 [0.42] Mounting holes 9/16 in-18 SAE str. th. O-ring boss charge pressure gauge port 3 9/16 in-18 SAE str. th. O-ring boss system pressure gauge port [1.25] 9/16 in-18 SAE str. th. O-ring boss system port 2 9/16 in-18 SAE str. th. O-ring boss system port [2.39] 13.0 [0.51] P E Thir-angle projection mm [in] Mount the loop flushing valve on any convenient flat surface that provies aequate support aroun the two mounting holes. Ensure the surfaces uner the mounting bolts form a flat plane. Failure to provie a flat mounting surface coul create valve housing istortion when the mounting bolts are torque. Housing istortion may bin internal components an reuce the rive an/or braking capacity of the system L0641 Rev EA Dec 2014

7 General information W Warning The loss of hyrostatic rive line power in any moe of operation may cause a loss of hyrostatic braking capacity. A braking system, reunant to the hyrostatic transmission, must be provie which is aequate to stop an hol the system shoul such a conition evelop. 520L0641 Rev EA Dec

8 Service Information Ajustment proceure For initial setting of the valve package: 1. Plumb an in-line flow meter into the rain line. If a flow meter is not available, use a clean container with a known volume an a stop watch to measure flow rate. 2. Set the brakes or otherwise restrict machine motion. 3. Stroke the transmission pump to buil at least 34 bar [500 psi] ifferential system pressure. 4. Ajust the relief valve in the flushing valve package to obtain the esire rain flow. Typically 7.5 to 11.4 l/min [2 to 3 US gal/min] is sufficient. Rotating the ajusting screw counter-clockwise increases flow an ecreases the effective pressure setting by approximately 5 bar [73 psi] per turn. 5. Torque the locknut 42 to 55 N m [31 to 41 lbf ft]. 6. Verify that pump charge pressure is above recommene minimum. 7. Remove the flow meter from the circuit. Ajustment iagram Relief valve ajustment h 1/2 in Locknut h1-1/16 in t42 to 55 N m [31 to 41 lbf ft] Drain 9/16 in - 18 str. th. O-ring boss port P E Service information Component installation torque Description Wrench size Torque Gauge port plugs 9/16 in hex 27 to 47 N m [20 to 35 lbf ft] Charge relief lock nut 1 1/16 in hex 42 to 55 N m [31 to 41 lbf ft] Orifice plug 3/16 in internal hex 22 to 27 N m [16 to 20 lbf ft] Shuttle spool plugs 11/16 in 36 to 44 N m [27 to 33 lbf ft] Hose/tube fittings 27 to 47 N m [20 to 35 lbf ft] 8 520L0641 Rev EA Dec 2014

9 Service Information Exploe view t42 to 55 N m [31 to 41 lbf ft] h 1-1/16 in t 27 to 47 N m [20 to 35 lbf ft] h 9/16 in 3 9 3A i 11 Enlarge bol type item numbers are recomene parts to be stocke for servicing t 36 to 44 N m [27 to 33 lbf ft] h11/16 in 16 16A 15 1 t 27 to 47 N m [20 to 35 lbf ft] h 9/16 in 2A 2 12 I 3/16 in t 22 to 47 N m [20 to 35 lbf ft] 13 t 27 to 47 N m [20 to 35 lbf ft] h 9/16 in 2 4 2A 4A 3A A 16 t 27 to 47 N m [20 to 35 lbf ft] h 9/16 in 2 2A E E 520L0641 Rev EA Dec

10 Service Information Replacement parts Item Part Number Description Quantity Housing assembly Plug 3 2A O-ring Plug 2 3A O-ring Plug 1 4A O-ring Charge relief valve kit O-ring Orifice plug Ø 2.40 mm [ in] 1 (opt.) Orifice plug Ø 3.19 mm [ in] 1 (opt.) Shuttle spool Spring guie assembly Special plug 2 16A O-ring L0641 Rev EA Dec 2014

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12 Proucts we offer: Bent Axis Motors Close Circuit Axial Piston Pumps an Motors Displays Electrohyraulic Power Steering Electrohyraulics Hyraulic Power Steering Integrate Systems Joysticks an Control Hanles Microcontrollers an Software Open Circuit Axial Piston Pumps Orbital Motors PLUS+1 GUIDE Proportional Valves Sensors Steering Transit Mixer Drives Danfoss Power Solutions is a global manufacturer an supplier of high-quality hyraulic an electronic components. We specialize in proviing state-of-the-art technology an solutions that excel in the harsh operating conitions of the mobile off-highway market. Builing on our extensive applications expertise, we work closely with our customers to ensure exceptional performance for a broa range of off-highway vehicles. We help OEMs aroun the worl spee up system evelopment, reuce costs an bring vehicles to market faster. Danfoss Your Strongest Partner in Mobile Hyraulics. Go to for further prouct information. Wherever off-highway vehicles are at work, so is Danfoss. We offer expert worlwie support for our customers, ensuring the best possible solutions for outstaning performance. An with an extensive network of Global Service Partners, we also provie comprehensive global service for all of our components. Please contact the Danfoss Power Solution representative nearest you. Comatrol Schwarzmüller-Inverter Turolla Valmova Hyro-Gear Daikin-Sauer-Danfoss Local aress: Lenntech info@lenntech.com Tel Fax Danfoss can accept no responsibility for possible errors in catalogues, brochures an other printe material. Danfoss reserves the right to alter its proucts without notice. This also applies to proucts alreay on orer provie that such alterations can be mae without changes being necessary in specifications alreay agree. All traemarks in this material are property of the respective companies. Danfoss an the Danfoss logotype are traemarks of Danfoss A/S. All rights reserve. Danfoss A/S, 2014