SUN M型平衡阀技术培训
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Load Reactive 4 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.)
• Maximum leakage at reseat is 5 drops/minute.
液压人论坛 http://www.hydraulic.ren
10
Load Holding Products Seminar Counterbalance/Load Reactive
4 Port Load Reactive Load Control Refined Gain Control with Pilot Assist, Vented
cartridges.
液压人论坛 http://www.hydraulic.ren
4
Load Holding Products Seminar Counterbalance/Load Reactive
Load Reactive Load Control Valve with Refined Gain Control
7
Load Holding Products Seminar Counterbalance/Load Reactive
M-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 a Load Reactive MW could solve the problem. (Both the MB and MW Load Reactive valves offer improved modulation and will add stability.)
液压人论坛 http://www.hydraulic.ren
6
Load Holding Products Seminar Counterbalance/Load Reactive
M-Valves and “Boom Bouncing” (cont.)
3 – Select a lower pilot ratio. • Lower pilot ratios minimize over opening making the valve less sensitive to pilot pressure fluctuations. • Lets go through two examples
液压人论坛 http://www.hydraulic.ren
9
Load Holding Products Seminar Counterbalance/Load Reactive
3 Port Load Reactive Load Control Valve Refined Gain Control with Pilot Assist, Non-vented
• 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
MBEG Load Press. Differential vs. Flow for Different Relief Settings
CBEG Load Press. Differential vs. Flow for Different Relief Settings
液压人论坛 http://www.hydraulic.ren
Load Holding Products Seminar Counterbalance/Load Reactive
Sun’s Family of Load Control Valves:
LOAD REACTIVE MODELS
液压人论坛 http://www.hydraulic.ren
1来自百度文库
Load Holding Products Seminar Counterbalance/Load Reactive
• 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 available
液压人论坛 http://www.hydraulic.ren
12
Load Holding Products Seminar Counterbalance/Load Reactive
Model Code Structure Load Reactive Load Control Valve
Model Type
B – Standard (3 port) W – Vented (4 port)
Frame Size (Cavity)
E – Series 2 G – Series 3 I – Series 4
Pilot Ratio
B – 1.5:1 A – 3:1 G – 4.5:1
M* * *- ***
Seal Options
M-阀 特性
• 具备更好的动态性能 • 如同平衡阀一样工作 • 提供更优的液压阻尼性能 • 由于压力升高时阻尼活塞的作用，并不能作为溢流阀 使用 • 复位压力在85%设定压力时，只有5滴/分的泄漏 • 所有系列都具备5000 psi溢流设定
液压人论坛 http://www.hydraulic.ren
液压人论坛 http://www.hydraulic.ren
8
Load Holding Products Seminar Counterbalance/Load Reactive
Troubleshooting Ratcheting with M-valve
5th – Add Custom options •Additional Dampening on collar •Additional Dampening on pilot (Not on Series 3 and 4 frame sizes)
N – Buna V – Viton
Pressure Ranges
25 psi (1,7 bar) Check Spring Standard
L Adjustments H – 1000-4000 psi
(70-280 bar) J – 2000-5000 psi
(140-280 bar) X Control (fixed relief setting) K – 3000 psi (210 bar) Nominal L – 4000 psi (230 bar) Nominal M – 5000 psi (350 bar) Nominal
• 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.) • Maximum 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 available
1 – Understand the ratcheting “Bouncing” load phenomenon
• Ratcheting of a load is usually attributed to the counterbalance valve over opening and then trying to recover
2
Load Holding Products Seminar Counterbalance/Load Reactive
Performance Data
MBEG-LJN Load Reactive vs. CBEG-LJN Counterbalance Modulation Control Characteristics
3
Load Holding Products Seminar Counterbalance/Load Reactive
Series 2, Load Control Valve Gain Comparison
Applicable to load reactive and non-load reactive
2 – “M” Valves can be sized for lower pressure drops with higher flows • When you over size a normal counterbalance your system can become unstable. If you use an “M***”-valve it is much less susceptible to this problem.
液压人论坛 http://www.hydraulic.ren
11
Load Holding Products Seminar Counterbalance/Load Reactive
Load Reactive Load Control Non-adjustable
Load Reactive 4 Port
Load Reactive 3 Port
液压人论坛 http://www.hydraulic.ren
Load Reactive 4 Port
5
Load Holding Products Seminar Counterbalance/Load Reactive
M-Valves and “Boom Bouncing”
Load Reactive 3 Port
Basic Valve Geometry:
• Spring bias forces valve into normally closed position. • Differential Area (A1 – A3) forms relief area. • Pilot ratio determined by (A2 – A1): (A1 – A3).
Example 1: L=2250, Pr=4.5, S=3000,
Cr=2
P=(3000-2250)/(4.5+1/2) P =150 psi
Example 2: L=2250, Pr=1.5, S=3000,
Cr=2
P = (3000-2250)/(1.5+1/2) P = 375 psi
液压人论坛 http://www.hydraulic.ren
• 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.)
• Maximum leakage at reseat is 5 drops/minute.
液压人论坛 http://www.hydraulic.ren
10
Load Holding Products Seminar Counterbalance/Load Reactive
4 Port Load Reactive Load Control Refined Gain Control with Pilot Assist, Vented
cartridges.
液压人论坛 http://www.hydraulic.ren
4
Load Holding Products Seminar Counterbalance/Load Reactive
Load Reactive Load Control Valve with Refined Gain Control
7
Load Holding Products Seminar Counterbalance/Load Reactive
M-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 a Load Reactive MW could solve the problem. (Both the MB and MW Load Reactive valves offer improved modulation and will add stability.)
液压人论坛 http://www.hydraulic.ren
6
Load Holding Products Seminar Counterbalance/Load Reactive
M-Valves and “Boom Bouncing” (cont.)
3 – Select a lower pilot ratio. • Lower pilot ratios minimize over opening making the valve less sensitive to pilot pressure fluctuations. • Lets go through two examples
液压人论坛 http://www.hydraulic.ren
9
Load Holding Products Seminar Counterbalance/Load Reactive
3 Port Load Reactive Load Control Valve Refined Gain Control with Pilot Assist, Non-vented
• 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
MBEG Load Press. Differential vs. Flow for Different Relief Settings
CBEG Load Press. Differential vs. Flow for Different Relief Settings
液压人论坛 http://www.hydraulic.ren
Load Holding Products Seminar Counterbalance/Load Reactive
Sun’s Family of Load Control Valves:
LOAD REACTIVE MODELS
液压人论坛 http://www.hydraulic.ren
1来自百度文库
Load Holding Products Seminar Counterbalance/Load Reactive
• 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 available
液压人论坛 http://www.hydraulic.ren
12
Load Holding Products Seminar Counterbalance/Load Reactive
Model Code Structure Load Reactive Load Control Valve
Model Type
B – Standard (3 port) W – Vented (4 port)
Frame Size (Cavity)
E – Series 2 G – Series 3 I – Series 4
Pilot Ratio
B – 1.5:1 A – 3:1 G – 4.5:1
M* * *- ***
Seal Options
M-阀 特性
• 具备更好的动态性能 • 如同平衡阀一样工作 • 提供更优的液压阻尼性能 • 由于压力升高时阻尼活塞的作用，并不能作为溢流阀 使用 • 复位压力在85%设定压力时，只有5滴/分的泄漏 • 所有系列都具备5000 psi溢流设定
液压人论坛 http://www.hydraulic.ren
液压人论坛 http://www.hydraulic.ren
8
Load Holding Products Seminar Counterbalance/Load Reactive
Troubleshooting Ratcheting with M-valve
5th – Add Custom options •Additional Dampening on collar •Additional Dampening on pilot (Not on Series 3 and 4 frame sizes)
N – Buna V – Viton
Pressure Ranges
25 psi (1,7 bar) Check Spring Standard
L Adjustments H – 1000-4000 psi
(70-280 bar) J – 2000-5000 psi
(140-280 bar) X Control (fixed relief setting) K – 3000 psi (210 bar) Nominal L – 4000 psi (230 bar) Nominal M – 5000 psi (350 bar) Nominal
• 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.) • Maximum 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 available
1 – Understand the ratcheting “Bouncing” load phenomenon
• Ratcheting of a load is usually attributed to the counterbalance valve over opening and then trying to recover
2
Load Holding Products Seminar Counterbalance/Load Reactive
Performance Data
MBEG-LJN Load Reactive vs. CBEG-LJN Counterbalance Modulation Control Characteristics
3
Load Holding Products Seminar Counterbalance/Load Reactive
Series 2, Load Control Valve Gain Comparison
Applicable to load reactive and non-load reactive
2 – “M” Valves can be sized for lower pressure drops with higher flows • When you over size a normal counterbalance your system can become unstable. If you use an “M***”-valve it is much less susceptible to this problem.
液压人论坛 http://www.hydraulic.ren
11
Load Holding Products Seminar Counterbalance/Load Reactive
Load Reactive Load Control Non-adjustable
Load Reactive 4 Port
Load Reactive 3 Port
液压人论坛 http://www.hydraulic.ren
Load Reactive 4 Port
5
Load Holding Products Seminar Counterbalance/Load Reactive
M-Valves and “Boom Bouncing”
Load Reactive 3 Port
Basic Valve Geometry:
• Spring bias forces valve into normally closed position. • Differential Area (A1 – A3) forms relief area. • Pilot ratio determined by (A2 – A1): (A1 – A3).
Example 1: L=2250, Pr=4.5, S=3000,
Cr=2
P=(3000-2250)/(4.5+1/2) P =150 psi
Example 2: L=2250, Pr=1.5, S=3000,
Cr=2
P = (3000-2250)/(1.5+1/2) P = 375 psi
液压人论坛 http://www.hydraulic.ren