04sun插装阀培训load holding presentations负载应用reactive-m

1、1 2008 Sun Hydraulics CorporationSuns Family of Load Control Valves:LOAD REACTIVE MODELS2 2008 Sun Hydraulics CorporationM-Valve Features Offer improved modulation performance Operate like a counterbalance Offer highly improved hydraulic dampening Not good relief valves because of the higher pressur

2、e rise and damped piston Provides 5 drops per minute reseat leakage at 85% of setting All ratios capable of 5000 psi relief settings3 2008 Sun Hydraulics CorporationPerformance DataMBEG-LJN Load Reactive vs. CBEG-LJN Counterbalance Modulation Control Characteristics MBEG Load Press. Differential vs.

3、 Flowfor Different Relief SettingsCBEG Load Press. Differential vs. Flowfor Different Relief Settings 2008 Sun Hydraulics Corporation4Series 2, Load Control Valve Gain ComparisonApplicable toload reactive andnon-load reactivecartridges.5 2008 Sun Hydraulics CorporationLoad Reactive Load Control Valv

4、e with Refined Gain ControlLoad Reactive3 PortLoad Reactive4 Port6 2008 Sun Hydraulics CorporationM-Valves and “Boom Bouncing”1 Understand the ratcheting “Bouncing” load phenomenon Ratcheting of a load is usually attributed to the counterbalance valve over opening and then trying to recover2 “M” Val

5、ves can be sized for lower pressure drops with higher flows When you over size a normal counterbalance your system can e unstable. If you use an “M*”-valve it is much less susceptible to this problem.7 2008 Sun Hydraulics CorporationM-Valves and “Boom Bouncing” (cont.)3 Select a lower pilot ratio. L

6、ower pilot ratios minimize over opening making the valve less sensitive to pilot pressure fluctuations. Lets go through two examples Example 1:L=2250, Pr=4.5, S=3000, Cr=2 P=(3000-2250)/(4.5+1/2)P =150 psiExample 2:L=2250, Pr=1.5, S=3000, Cr=2P = (3000-2250)/(1.5+1/2)P = 375 psi8 2008 Sun Hydraulics

7、 CorporationM-Valves and “Boom Bouncing” (cont.)4 Review Gain characteristics of original counterbalance valve If lowest gain/fully restrictive CB valve does not stop the “bouncing”, the next choice would be a Load Reactive MB. If a low ratio CW has been applied (because of back pressure), possibly

8、a Load Reactive MW could solve the problem. (Both the MB and MW Load Reactive valves offer improved modulation and will add stability.) 9 2008 Sun Hydraulics CorporationTroubleshooting Ratcheting with M-valve5th Add Custom optionsAdditional Dampening on collar Additional Dampening on pilot (Not on S

9、eries 3 and 4 frame sizes)10 2008 Sun Hydraulics Corporation3 Port Load Reactive Load Control Valve Refined Gain Control with Pilot Assist, Non-ventedLoad Reactive3 Port 3:1, 1.5:1, and 4.5:1 pilot ratios available. Standard 3 port model for T-2A, T-17A and T-19A cavities. (Series 2, 3, and 4.) Maxi

10、mum leakage at reseat is 5 drops/minute. Valves reseat within 85% of setting. Back pressure works at pilot ratio +1 to close valve. Series 2, 3 and4 readily availableBasic Valve Geometry: Spring bias forces valve into normally closed position. Differential Area (A1 A3) forms relief area. Pilot ratio

11、 determined by (A2 A1): (A1 A3). 11 2008 Sun Hydraulics Corporation4 Port Load Reactive Load Control Refined Gain Control with Pilot Assist, VentedLoad Reactive4 Port 3:1, 1.5:1, and 4.5:1 pilot ratios available. Standard 4 port model for T-22A, T-23A and T-24A cavities. (Series 2, 3, and 4.) Maximu

12、m leakage at reseat is 5 drops/minute. Valves reseat within 85% of setting. 4 port vented insensitive to back pressure at port 2 No plans to offer atmospherically vented version. Series 2, 3, and 4 readily available12 2008 Sun Hydraulics CorporationLoad Reactive Load Control Non-adjustableLoad React

13、ive4 Port 3:1, 1.5:1, and 4.5:1 pilot ratios available. Standard 3 & 4 port models for T-22A, T-23A and T-24A cavities. (Series 2, 3, and 4.) Maximum leakage at reseat is 5 drops/minute. Valves reseat within 85% of setting. Standard relief settings at 3000, 4000, and 5000 psi nominally 13 2008 Sun H

14、ydraulics CorporationModel Code StructureLoad Reactive Load Control ValvePressure Ranges25 psi (1,7 bar) Check Spring StandardM * * * - * * *Model TypeB Standard (3 port)W Vented (4 port)Pilot RatioSeal Options N BunaV VitonL AdjustmentsH 1000-4000 psi (70-280 bar)J 2000-5000 psi (140-280 bar)X Cont

15、rol (fixed relief setting)K 3000 psi (210 bar) NominalL 4000 psi (230 bar) NominalM 5000 psi (350 bar) NominalB 1.5:1A 3:1 G 4.5:1Frame Size (Cavity)E Series 2 G Series 3 I Series 4Adjustment ControlL Leak proof adjustmentX Non-adjustable, fixed settingC Tamper proof adjustment, Available for series 2 only14 2008 Sun Hydraulics CorporationCB / Load Reactive M-valve Comparison CB or CW are more cost effective M valves offer improved modulation performance M valves offer highly improved hydraulic da