Eaton Dual Self-Level Valve. January 1997 NEW. Model FAZ Dual Self-Level Valve

Transcription

1 an ual Self-Level Valve January 1997 NW Model Z ual Self-Level Valve

2 an 20 GPM ual Self-Level Valve Specifications Standard eatures ast Iron ody ored Internal Passages Spools are precision Ground and Induction Hardened onnects In Open enter, losed enter and Load Sensing Systems an be used with Parallel or Series ircuit Valves xternally djustable low ivision ssembly Order Number Z ircuit esign: ual Self-Level Valve Inlet low Rate: 76 l/min. [20 GPM] Rated Pressure: 240 bar [3500 PSI] Maximum Pressure: 275 bar [4000 PSI] Port unctions: Port: oom Head nd - oom Raise Port: ontrol Valve - oom Raise Port: oom ylilnder Rod nd - oom Lower Port: ontrol Valve - oom Lower Port: ucket Head nd/ontrol Valve - ucket ump Port: ucket Rod nd/ontrol Valve - ucket url low ivider Settings: Raise - Port = 60% Port = 40% Lower - Port = 30% Port = 70% Pressure rop: Port -14 bar [200 psi] at 30 l/min [8 gal/min] with adjustment orfice R closed Port -14 bar [200 psi] at 57 l/min [15 gal/min] with adjustment orfice L closed Relief Valve Setting: Port Setting = 52 bar [750 psi] maximum at 38 l/min [10 gal/min] Port Setting = none (plugged) imensions 66. [2.60] 31.8 [1.25] 16.8 [.66] 3.8 [.15] 6X WORK PORT 7/8-14 UN 2 S O RING PORT [5.62] [4.13] 76.2 [3.00] 38.1 [1.50] R L [7.75] [6.62] [6.25] 2x133.4 [5.25] 38.1 [1.50] 95.6 [3.75] [.13] 61 [2.40] 88.9 [3.50] [4.50] 124 [4.88] [7.26] 25.4 [1.00] 50.8 [2.00] 19.1 [.75] X THRU [ ] 4X [4.00] 23.9 [.94] X [1.24] 65 [2.56] 85.6 [3.37]

3 ual Self-Level Valve Key eatures: Increases operar productivity Repeatable aumatic self-leveling in both directions raise and lower ompact package ewer hydraulic connections than other methods of dual self-level control Low internal leakage In-line design for flexibility and aftermarket add-on applications Specifically designed for skid steer loaders, agricultural tracr loaders and small wheel loaders xceptional value pplications: Skid Steer Loaders gricultural Tracr Loaders Small Wheel Loaders Production Options: low divider setting for application cusmization Relief valve setting Solenoid bypass valving ual Self-Level Valve Operation The ual Self-Level valve is designed be used in open center, closed center and load sensing systems. In addition, it may be used with parallel or series circuit valves. When connected a parallel circuit valve, the system is capable of self-leveling or operating boom and bucket individually. When the self-level valve is installed in a system that used a series circuit valve, the boom spool must be upstream from the bucket spool for the leveling valve function properly. Loader control valve metering and timing are important in maintaining good boom and bucket control in both conventional and self-leveling systems. avitation of the boom cylinder is possible, in the boom lower mode, if inlet workport metering lags behind workport return metering. If this is allowed, the bucket will hesitate during its next cycle while the rod end of the boom cylinder fills with oil. an produces control valves with precise metering that enhances the dual self-level valve operation. In addition, an offers boom/bucket design assistance optimize attachment leveling using an valves. Let us assist you in solving your application problem. 3

4 ual Self-Level Valve Self-Leveling Raise With the bucket spool in neutral and the boom spool in the raise position, flow from the control valve enters port of the dual level valve and out port of the dual level valve the head port of the boom cylinder. s the boom cylinder extends, flow from the rod port is directed port of the dual level valve. low entering port is able pass through the adjustable orifice in the flow divider spool. The proportion of the flow split is determined by the size of the adjustable orifice. Part of the flow is directed out port the head port of the bucket cylinder. The remaining flow passes through port back the control valve tank. The bucket cylinder will extend when pressure at port shifts the unload spool allow flow from the rod end of the bucket cylinder flow in port, across the unload spool and out port tank. oom ontrol Valve oom Spool ucket Spool ucket Pressure ree Oil 4

5 ual Self-Level Valve Raise with ucket xtended This flow chart shows that the boom will continue raise when the bucket cylinder is fully extended. Oil exiting the boom cylinder that normally flows out port the bucket cylinder is allowed flow through the unload spool integral relief, out port tank. The relief valve opens at relatively low pressure with little effect on boom lift capacity. The same relief feature allows the operar dump the bucket while raising the boom without stalling the boom cylinder. oom ontrol Valve oom Spool ucket Spool ucket Pressure ree Oil 5

6 ual Self-Level Valve Self-Leveling oom Lowering With the bucket spool in neutral and the boom spool in the lower position, flow from the control valve enters port of the dual level valve and out port of the dual level valve the rod end port of the boom cylinder. s the boom cylinder retracts, flow from the head port is directed port of the dual level valve. low entering port is able pass through the adjustable orifice in the flow divider spool. The proportion of the flow split is determined by the size of the adjustable orifice. Part of the flow is directed out port the rod end port of the bucket cylinder. The remaining flow passes through port back the control valve tank. The bucket cylinder will retract when pressure at port shifts the unload spool allow flow from the head end of the bucket cylinder flow in port, across the unload spool and out port tank. oom ontrol Valve oom Spool ucket Spool ucket Pressure ree Oil 6

7 ual Self-Level Valve oom Lowering with ucket ully Retracted This flow chart shows that the boom will continue lower when the bucket cylinder is fully retracted if the optional cartridge relief valve is installed. Oil exiting the boom cylinder head end that normally flows out port the bucket cylinder is allowed flow through the lower relief valve cartridge, out port tank. (The relief valve is set open at a pressure above the pressure required curl the bucket and below the pressure that can be generated from the base end of the boom cylinder. The boom cylinder base can generate pressure from an external load and from a percentage of the master relief valve setting based on the cylinder ratio.) The pressure drop through the valve in this mode will depend on the relief setting and the bucket load. The same relief feature allows the operar curl the bucket while lowering the boom without stalling the boom cylinder. oom ontrol Valve oom Spool ucket Spool ucket Pressure ree Oil 7

8 ual Self-Level Valve ucket url Only With the bucket spool shifted the curl position, oil flow is directed the rod port of the bucket cylinder and in port of the level valve where flow is blocked by an unload spool and check valve. xhaust oil from the head end of the bucket cylinder is directed back tank through the control valve while flow in port is blocked by an unload spool and check valve. oom ontrol Valve oom Spool ucket Spool ucket Pressure ree Oil 8

9 ual Self-Level Valve ucket ump Only With the bucket spool shifted the dump, oil flow is directed the head port of the bucket cylinder and in port of the level valve where flow is blocked by an unload spool and check valve. xhaust oil from the rod end of the bucket cylinder is directed back tank through the control valve while flow in port is blocked by an unload spool and check valve. oom ontrol Valve oom Spool ucket Spool ucket Pressure ree Oil 9

10 ual Self-Level Valve Raise oom with Self-Level eactivated With the solenoid bypass valve plumbed in the position shown, the operar has the option of deactivating the self level raise function. With the solenoid valve energized exhaust oil from the rod end of the boom cylinder enters port of the level valve, passes through the solenoid valve and flows tank out port. The bucket cylinder will not move during this operation. If the solenoid valve is not energized then self leveling is resred. To oom Lower Port To oom Raise Port (Opt. ypass Valve) oom ucket OPTION 1 eactivates Self-Level Raise To ucket url Port To ucket ump Port Solenoid Valve oom ontrol Valve oom Spool ucket Spool ucket 10 Pressure ree Oil

11 ual Self-Level Valve Lower oom with Self-Level eactivated With the solenoid bypass valve plumbed in the position shown, the operar has the option of deactivating the self level lower function. With the solenoid valve energized exhaust oil from the head end of the boom cylinder enters port of the level valve, passes through the solenoid valve and flows tank out port. The bucket cylinder will not move during this operation. If the solenoid valve is not energized then self leveling is resred. To oom Lower Port To oom Raise Port (Opt. ypass Valve) oom ucket OPTION 2: eactivates Self-Level Lower To ucket url Port To ucket ump Port oom ontrol Valve oom Spool ucket Spool Solenoid Valve ucket Pressure ree Oil 11

12 39055-Z ual Self-Level low ivider Worksheet Required ata: oom ore iameter... = G oom Rod iameter... = H oom Self-Level Stroke... = J ucket ore iameter... = K ucket Rod iameter... = L ucket Stroke (Level Raised Level Lowered)... = M Main Relief Valve Setting... = N Standard ucket Geometry Raise % low at Port = Volume ucket yl. (Head nd) Volume oom yl. (Rod nd) Lower % low at Port = Volume ucket yl. (Rod nd) Volume oom yl. (Head nd) % low at Port = (K 2 )(M) (G 2 -H 2 )(J) % low at Port = (K 2 L 2 )(M) (G 2 )(J) Lower - Relief Setting Port Relief Valve Setting (optional) = ( G 2 -H 2 ) G 2 (N)

13 an luid Power Group Hydraulics usiness US Lone Oak Road den Prairie, MN US Tel: ax: an luid Power Group Hydraulics usiness urope Route de la Longeraie Morges Switzerland Tel: +41 (0) ax: +41 (0) an luid Power Group Hydraulics usiness sia Pacific 11th loor Hong Kong New World Tower 300 Huaihai Zhong Road Shanghai hina Tel: ax: an orporation ll Rights Reserved Printed in US ocument No. -VLM-M004- Supersedes November 2008